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Document DEVICE REPORTTelevision-2004-03-S-OCRTips, guides and reports for people repairing televisions and electronic equipment TELEVISION AND HOME ELECTRONICS REPAIR MARCH 2004 £3.20 Workshop equipment guide Servicing the Philips L.01 chassis Simple volume compressor circuit 03> 9 2 647 1 39 Satellite, Audio, Monitor, TV, VCR and DVD faults The celebra ions continue... With the launch of 57 brand new handsets in our new 2004 case designs. CONTENTS March 2004 Vol. 54, No. 5 259 Comment Thoughts on CES. 260 Teletopics Alba bids for Grundig. Philips develops rollable video displays. New MiniDisc format. D -VHS development from JVC. Recycling consortium set up. 262 Simple volume -compressor circuit Keith Cummins discovered that the car mobile phone hands -free kit he bought was very loud and prone to howl -back. To overcome the problem he devised this simple volume -compressor circuit. 263 Workshop equipment guide 2004 - Part One Eugene Trundle takes a look at what's good and what's new in the world of test gear and aids for bench and field servicing. There's nowadays a huge armoury of equipment for testing, fault diagnosis, repair and setting up the digital and analogue circuitry and systems we have to deal with. Part 1 kicks off with traditional analogue test equipment. 272 Servicing the Philips LO1 chassis The Philips LO1 chassis can drive 14 to 32in. tubes with 4:3 or 16:9 aspect ratio. It's based on the Philips Ultimate One Chip (UOC), an 80 -pin IC that acts as the microcontroller and signal processor. Brian Storm describes the circuitry used, the service modes and lists some known faults. 277 Introduction to computer networking In Part 3 of his latest series Fawzi Ibrahim describes the action of routers in local -area and wide -area networks. 280 Service casebook Michael Maurice selects faults from his notebook. 287 College of NW London The College of MV London has been expanding the range courses and services on digital technology it offers to firms of all types and sizes. 288 A day in the life of ... Peter Dolman reflects on a day in the workshop and the huge efforts that were required to set it up in an old farm outbuilding. 290 DX and Satellite Reception Terrestrial DX and satellite TV reception reports. Broadcast, satellite and digital TV news. Could Bluetooth be an interference problem? The early days of ITV. Roger Bunney reports. 294 Audio faults 295 Test Case 495 296 Extended fault reports Reports on tricky or complex TV ult conditions. We've put a few of them together in this extended fault report feature. 298 TV fault finding 301 VCR clinic 302 DVD faults 304 Letters Picture quality. TV downleads. 304 Help wanted 305 Monitors Guidance on repairing monitors and related equipment. 306 Web service 308 Books to buy 310 What a life! A mixed batch of customers and faulty equipment. Donald Bullock's servicing commentary. 312 Satellite notebook The European HDTV channel. Digital channel update. Reception from Eutelsat 2F3. Digibox fault report. Editor John A. Reddihough Deputy Editor Tessa Winford Production Editor Jane Massey Advertisement Sales Luke Baldock 01322 611 289 Fax 01322 616 376 Editorial Assistant Caroline Fisher 01322 611 274 Managing Editor Bill Evett Publishing Director Tony Greville Note that we are unable to answer technical queries over the telephone and cannot provide information on spares other than that given in our Spares Guide. Disclaimer We work hard to ensure that the information presented in Television is accurate. However, Television's publisher - Highbury Business Communications - will not take responsibility for any injury or loss of earnings that may result from applying information presented in the magazine. It is your responsibility to familiarise yourself with the laws relating to dealing with your customers and suppliers, and with safety practices relating to working with electrical/electronic circuitry particularly as regards electric shock, fire hazards and explosions. TELEVISION March 2004 WILTSGROVE LTD 35/38 River Street, Digbeth, Birmingham B5 5SB TEL: 0121 772 2733 - FAX: 0121 766 6100 L e-mail: [email protected] http://www.wiltsgrove.co.uk agelif 9:00am - 6:00pm (Monday to Saturday) VALID UN IA. i Ht. LAW Or IVIANLM= ruwido WILTSGROVE LTD sole distributor of Ruwido is the forerunner in technology and know-how and one of the world's leading companies specialised in innovative infrared applications. Ruwido replacement remote controls (RIR Series) for most makes and models at £5.95 IN -STOCK! SHARP MARAN AKU MATSU F7 FIE COODM; GO, 1HORN-FER OSAKI P TELEFt WATSON TF BAIRD )N DU SONY DANSAI MSTRAE TOSHIBA SABA ONVVA NIKKAI PIONEER MAINS SWITCH 14111- 1 Order code SW -02R REPLACEMENT 1 £1.95 10+ £1.75) MAINS SWITCH Order code SW -1007R REPLACEMENT 1 £.1.20 ) (.1). £1.08 MAINS SWITCH MAKE/MODEL No. FERGUSON A1OR B49F A14R C39F B14C C49F B14R 014R 839F T1OR Order code SW -1046 £2.55 ) 10+ £1.95 MAINS SWITCH REMOTE CONTACTS MAKE/MODEL No. BUSH WS6668S11 Order code SW -1047R REPLACEMENT 1 £1.95 10+ £.1.75) L OEM NO. 003071002 2436892 F2015BM 10542971 13420006 13525008 TRANSFORMERS - IN STOCK PRICE (E) 5.95 9.95 10.90 10.95 10.95 10.95 OEM NO. PRICE (E) FUV20A002B 13525033 11425057 13525048 10270640 1355037 10.95 11.45 11.95 11.95 12.45 12.95 OEM NO. 13525006 13525016 10500980P1 1352.5036 3214029 10516050 PRICE (£) 12.95 12.98 14.25 14.45 14.75 14.98 4CH REAL TIME STAND ALONE DVR FEATURES Built-in Quad. Various recording speed Individual camera set up Manual / alarm / schedule recording mode Order code AV -6075 £345.00 Real time display Buzzer alarm when video loss Looping output Alarm Input s 4 SPECIFICATION Image System NTSC PAL Resolution Display 720 x 480 720 x 576 Video Input BNC x 4 Video Looping output BNC x 4 Video Output BNC x 1 IONMEMENIRMININIMINI Display Frame 4 x 30 fields/sec 4 x 25 fields/sec Rec Frame Rate (QUAD) Max 30 fps Max 25 fps Rec Frame Rate (MUX) Max 30 / 4 fps Max 25 / 4 fps Storage Media Max 2 IDE Hard Disks Image Format MJPEG Compress Low: 12K bytes/frame High: 20K bytes/frameill Rate Medium: 15K bytes/frame Recording Mode Manual / Alarm 1 Schedule Playback Speed Fast Forward x 2 x 4 x 6 / Fast Reverse x 6 Frame by Frame Forward Playback On Screen Dsplay 8 Setup Time / Date / Setup Menu Relay Output NO or NC Programmable Contact x 1 Password Control Buzzer One for HDD formal Yes itairaid Video loss Power Input Yes AC 90-260 V Input 60/50Hz) IN= Dimensions (WxHxD) 432 x 44 x 28 mm Weight 4 (Kgs) MAINS SWITCH Order code SW -1009 1 £1.25 10+ £1.12 MAINS SWITCH Order code SW -1014R REPLACEMENT 1 £1.20 10+ 2.1.08 ) MAINS SWITCH MAKE/MODEL No. PHILIPS 14PV284 14PV330/07 21PT1664 21PT4475 24PW6005 25PT4475 28PW6005/05 28PW6515/05 32PW6305 32PW6515 Order code SW -1042R REPLACEMENT 1 £1.95) 10+ £1.75 MAINS SWITCH NO REMOTE CONTACTS MAKE/MODEL No. DAEWOO DWP28W2GB Order code SW -1054R REPLACEMENT 1 £1.95 £.1.75 MAINS SWITCH MAKE/MODEL No. SANYO CBP2151 CB P2152 CBP2162 CB P2168 CBP2180 CBP2551 CBP2552 Order code SW -144R REPLACEMENT 1 £1.25 ) 10+ £1.12) MAINS SWITCH MAKE/MODEL No. SONY KVD2512U KVE2922U KVM 14TU KVM 1420U KVMI9TU KVM2131 KVM2151 KVM2121U KVM2131U KVX2132U Order code SW -148R REPLACEMENT 1 £.1.25 ) il0+ ) * PRICES SUBJECT TO * PRICES MAYBE CHANGED WBHOITUY, PRI OR **TRADE ONLY**I eelcAf Ue I1 - e 0500 55 05 05 Thoughts on CES The Las Vegas Consumer Electronics Show, held in early February, is probably as good an indication of the state of the consumer electronics industry as any, reflecting as it does conditions in the world's largest CE market, the US. According to estimates released by the US Consumer Electronics Association, which runs the CES, volume sales last year are expected to have increased by between 5-25 per cent, depending on sector, while sales by value increased by just two per cent, to some $96.3bn (£52.2bn). So there you have it in a nutshell - pressure on profitability. Nowhere is this more marked than with DVD players, which just two years ago were providing good profits as something new but have since become a commodity, selling at about $30 apiece in the US. Nevertheless this year's CES was an important event: to maintain their position and profitability, manufacturers are concentrating on innovation and adding value - all those extras that are packed into today's leading products - while the show marked a noticeable increase in the IT industry's interest in consumer electronics. For example Microsoft used the show as an opportunity to unveil a range of products and services designed to establish the PC as the centre of home entertainment. HewlettPackard highlighted market convergence by announcing a range of CE products to complement its IT portfolio: plasma and LCD TV sets, home -cinema projectors, and a Home Entertainment Hub to provide a central domestic storage and access device for audio and video material. Gateway has already become one of the leading sellers of flat -screen TV sets in the US. High -definition TV was a major feature of the Show. How might we get it here? Digital transmission and satellite bandwidth are both keys to this, but it seems more likely that a move to higher definition will driven by the AV market. Once you have HD AV material and displays, broadcasting will eventually follow. But HDTV is probably more important in the US, which still suffers from its traditional, relatively low -definition 525 -line broadcasting system. Really good 625 -line displays are good enough for most purposes, unless you are viewing a massive screen. HD video based on blue -light laser technology could help drive the AV market: it depends on how the technology comes to be marketed - whether it goes the same way as basic DVD, or can be exploited to give manufacturers and retailers alike greater benefit. Plasma and LCD panels are well suited to HD video, since you can pack those pixels in. Samsung showed an 80in. plasma screen Technological innovation is vital for today's leaders in the CE and IT markets to stay ahead. It won't be easy for them. 11 and a 57in. LCD screen, both the largest so far of their types. All very well, but hardly the thing for the average living room, certainly in the UK. What manufactures seem to want us to have are media centres that serve AV outlets around the home. The hard -disk drive is steadily overtaking other forms of media storage for all applications, with suitable software of course. This is the way in which the likes of Microsoft and H -P are beginning to participate in the world of CE. The hard disk is readily compatible with other digital AV media: digital technology should be able to handle data in different formats, though it doesn't always seem so in practice! The IT companies can benefit from having proprietary software. Apple Computer for example has had marked success with its iPod and iTunes technology, COPYRIGHT C Highbury Business Communications, 2004. All rights reserved. No part of this publication may be reproduced, stored or transmitted in any form or by any means without the written permission of the publishers. All reasonable precautions are taken by Television to ensure that the advice and data published are reliable. We cannot however guarantee it and we cannot accept legal responsibility for it. CORRESPONDENCE All correspondence regarding advertisements should be addressed to the Advertisement Manager, Television, Highbury Business Communications, Nexus House, Azalea Drive, Swanley, Kent, BR8 8HU. Editorial correspondence should be addressed to Television, Editorial Department, Highbury Business Communications, Nexus House, Azalea Drive, Swanley, Kent, BR8 8HU. INDEXES AND BINDERS Indexes for Vols. 38 to 53 are available at £3.50 each from SoftCopy Ltd., who can also supply an fifteen year consolidated index on computer disc. For further details see page 315. Binders that hold twelve issues of Television are available for £6.50 each from Modern Bookbinders, Pringle Street, Blackburn, BB1 1SA. Telephone: 01254 59 371 Make cheques payable to "Television Binders". Newstrade Enquires Distributed by COMAG Telephone: 01895 444055 ISSN 0032-647X which H -P has licensed as part of its entry into the CE market. There is also something new in broadband cable distribution: plastic rather than glass fibre -optic cable. Sejong Network Technologies, a South Korean company, demonstrated what it described as the first "gigabit to the home" system using plastic fibre cable. The company is a member of POFTO (the Plastic Optical Fibre Trade Organisation), along with Mitsubishi Rayon and others. Sejong's Gigabox is the centre of its home distribution network. Innovation and value-added features can be used to drive markets but, one can't help wondering, will the products all end up being mass-produced by OEM businesses in China, with little profit for anyone? Technological innovation is vital for today's leaders in the CE and IT markets to stay ahead. It won't be easy for them. Next month we will include a more detailed review of what was to be seen at CES 2004. Cover photo Our thanks to Swires Research who provided the main cover photograph this month. SUBSCRIPTIONS Highbury Subscription Services, Link House, 8 Bartholomew's Walk, Ely, Cambridge CB7 4ZD. Telephone 01353 654 431 Fax 01353 654 400 Email [email protected] Please notify change of address. Subscription rates: UK 1 year £33.80, 2 years £54.00, 3 years £71.00. Republic of Ireland 1 year £38.95, 2 years £62.00, 3 years £81.85. Mainland Europe 1 year £49.00, 2 years £78.40, 3 years £102.90. Rest of World 1 year £63.50, 2 years £101.00, 3 years £133.00. Cheques should be made payable to Television. BACK NUMBERS If available issues are £4.00 each. HIGH t URY Business Communications A SUBSIDIARY OF HIGHBURY HOUSE COMMUNICATIONS PLC March 2004 TELEVISION 259 TELETOPICS Alba bids for Grundig Alba and Turkish manufacturer Beko Electronik have, in a 50-50 partnership, made an offer worth up to £80m for the Home Intermedia Systems (TV, video) division of Grundig, which was placed in administration early last year (see Teletopics June 2003) after several loss making years. Alba's present range of brands includes Bush, Goodmans and Roadstar. Up to now the company's sales have been 85 per cent in the UK. The expectation is that within three years 50 per cent of Alba's sales could be outside the UK, mainly in Europe. Alba's shares advanced strongly on the prospect of substantially increased business after acquir- ing the well -established Grundig brand. The administrator has been able to keep Grundig going, and in fact it had a strong presence at last year's IFA in Berlin. Staff levels have, in administration, been cut from 2,700 to about 350. Grundig was expected to return to profitability in the year to April 2005. Rollable video displays Philips has developed a new, lightweight video display screen that's unbreakable and can be rolled up into a small -sized housing when not in active use. The company says it is particularly attractive for mobile applications, including portable TV sets and games consoles, and adds that large -area displays could ultimately become feasible. At present the largest screen produced has a diameter of 5in.: cost rather than production difficulty is likely to determine size limit. Flexibility is such that the screens could be integrated into an everyday object such as a pen. Philips considers that the availability of such displays will greatly stimulate the development of electronic books, newspapers and magazines, and new services offered by 3G mobile -network operators. Having proved the feasibility of manufacturing such displays, Philips plans to move rapidly towards development of volume -production technology. An internal venture called Polymer Vision has been established for the purpose within the Philips Technology Incubator. Polymer Vision is involved in the fabrication of large arrays of polymer -based thin-film transistors (TFTs) and the design of circuitry that exploits the characteristics of organic electronics. The 5in. rollable organics -based screen has QVGA resolution (320 x 240 pixels at 85 d.p.i.) and a bending radius of 2cm. The display corn- bins a 25 -micron thick active -matrix backplane that contains the pixel -drive electronics with a 200 -micron thick front plane of reflective 'electronic ink' developed by E Ink Corporation. The latter contains capsules of coloured particles that react to an electric charge. Electronic -ink based displays are thin and flexible because they don't require cell gap control. Displays made using this technology can be used for reading -intensive applications. Power consumption is extremely low. The prototype screens have almost 80,000 11-1 s, providing the largest organics -based display to date with the smallest pixel pitch. Polymer Vision is developing a pilot production line. New MiniDisc format Sony has developed a new MiniDisc format, Hi -MD, with a storage capacity of 1GB, i.e. more than five times the amount of sound, video or computer data that can be stored on a standard MiniDisc. The key to this is a new technique called Domain Wall Displacement Detection DWDD). The new MiniDisc has three magnetic layers instead of one. The data is recorded on the bottom layer but is too small to be read by an MD laser, so the laser power is increased to alter the characteristics of the middle layer and produce brief expanded spots that can be read in the top layer. Heating and cooling is fast enough for DVD-quality video and surround sound audio to be recorded and played back. ATRAC3 plus compression is used for sound and a FAT (File Allocation Table) system for data files such as video and text. Hi -MD Walkman products are scheduled for launch in Europe in early summer. They will be compatible with the standard MiniDisc format. D -VHS development JVC has developed a system for authoring DTS surround -sound with its Data VHS (D -VHS) D -Theatre high -definition prerecorded video software format, as an option in the North American market. D VHS is a high -definition version of VHS, using digital instead of analogue recording. D -Theatre incorporates proprietary encryption to prevent unauthorised copying. The DTS system was added as an option to D -Theatre software, which includes Dolby Digital and MPEG Audio (MPEG-1, Layer 2) as mandatory audio components. JVC announced the D -VHS D -Theatre format in 2002: the encryption enables film companies to release high -definition content on D -VHS tape. It's currently the only format in the world that enables consumers to view high -definition that's better than HD broadcast standards. Since D Theatre was launched, high -definition film content has been released by major studios such as Artisan Home Entertainment, DreamWorks SKG, Twntieth Century Fox and Universal Studios. There are now more than fifty titles. Dolby Digital sound is encoded at 576kbits/sec with D -VHS. This is faster than DVD's Dolby Digital data rate, and surpasses that of DVD Video. D -Theatre DTS surround -sound is encoded at its full rate of 1.5Mbits/sec. 260 March 2004 TELEVISION Smallest camcorder from Sanyo Sanyo has launched the Xacti Model VPCCl camcorder which, weighing only 155g, is claimed to be the world's smallest digital video recorder. Several other world firsts are claimed, including the first to use a 3.2 megapixel sensor for movies and stills simultaneously, the first to use MPEG-4 video compression with VGA picture quality, and the first to use AAC stereo sound recording. Data storage is on an SD memory card, giving about 40 minutes of S -VHS quality video with a 256MB card. Why Xacti? Well, it's a combination of 'exact' and 'active', the idea being optimum 'lifestyle appeal'. The unit has a large -diameter 24mm objective lens and a 5.8x optical zoom. Recording quality is adjustable between five levels, from low -resolution web video to DVD quality. A 1GB SD card will hold over an hour of HQ -video or over five hours of web -quality video. A flip -out display enables recording to be monitored: the LCD panel is trans -reflective, enabling sunlight to enhance viewing in bright conditions. A super macro mode can focus on objects only 20mm away from the objective lens. Shots can be edited in -camera to save downloading time. A multiplay facility strings shots together to provide a slide show. The built-in stereo microphone gives 16 -bit two -channel sound that's compressed as MPEG-4 audio. A voice recorder function enables over four hours of audio to be recorded on a 256MB SD card. Other features include creative image modes, auto -focus, video image stabilisation, portrait and landscape modes, zoom and -crop recording and dual menus to assist the user interface. A docking station is provided to ensure that the VPC-C1 remains charged and can be easily connected to PC and TV devices via USB and AV cables. The CPC -C1 is expected to sell for under £500. For further details check at www.sanyo.co.uk Recycling consortium set up A number of manufacturers of electrical and electronic equipment have set up a joint company to manage the recycling of their products in the UK under the Waste Electrical and Electronic Equipment (WEEE) Directive, which will come into effect in August 2005. The new company has the provisional title Recycling Electrical Producers Industry Consortium (REPIC): members include Alba, Beko, B&W Loudspeakers, BSH Home Appliances, Candy, Glen Dimplex, Hoover, Kohler, Merloni, Numatic, Philips and Smeg. Other companies are expected to join or set up alternative consortia. The company will enter into contracts with recycling businesses to take large volumes of discarded products, from TV sets to light bulbs, and expects to recycle some 1.2m tonnes of products a year. Dell enters TV market Dell, the world's largest PC company, has launched its first TV set. At present it is on sale only in the US, at about $700. Model W1700 has a widescreen LCD panel and, naturally, can also be used as a PC monitor - it enables two web pages or word docu- ments to be viewed side by side. There's remote control, and the audio from built-in surround -sound speakers can be adjusted for different types of material. The connection cables are easy to identify and hide behind a cover. Sharp's triple -tuner video recorder Sharp has launched in Japan a DVDNCR combination recorder, Model DV-RW200, that's equipped with three tuners. There are a VHF/UHF tuner and an analogue BS (Broadcast Satellite) tuner for recording on DVD, and an additional VHF/UHF tuner for recording on VHS tape. The arrangement makes it possible to tune in and record different TV channels, one on tape and the other on DVD. The unit also features 'easy DVD video dubbing', i.e. material can be transferred from videotape to a DVD-RW/R disc or from a DVD-RW/R disc to tape. Sharp says that the basic recording medium is shifting from tape to disc: the DVRW200 is a versatile alternative that enables users to make use of either. No UK launch details have been released. LG has launched a multi -standard DVD recorder, Model DR4810, in the UK. It can record on DVD+R/RW and DVD-R/RW discs and has DTS, Dolby Digital 5.1, PCM and 3D surround sound options. The DR4810 can read DVD (PAL or NTSC), Audio -CD, CD-R/RW, DVD+R/RW, DVD-R/RW, V CD, SVCD and MP3-encoded CD discs. It will also work with the WMA system, giving playback of compressed downloaded material, and the Kodak Picture CD system, and has a JPEG .4111111111111Pammir COMO° LG's multi -standard DVD recorder 7 1 0:03:172 viewer. There are five record -quality settings. With a 4.7GB disc the recording time is two hours in the standard -quality mode and four hours in the lower -quality mode. There are comprehensive file management and editing facilities. Thumbnail previews for title, chapter and programme, and a delete option, make access to material fast and simple. Recordings can be moved and chapters ordered and titled. The picture -in -picture facility enables two images to be viewed simultaneously, such as a movie and a TV channel. The protected disc option ensures that recordings cannot be accidentally erased or over -recorded. There's a DV input for camcorders, and a memory -card slot for SD and multi -media cards. For further details check at www.lge.co.uk TELEVISION March 2004 261 Simple volume-compressor circuit Keith Cummins discovered that the car mobile -phone hands -free kit he bought was very loud and prone to howl -back. To overcome the problem he devised this simple volume -compressor circuit Irecently bought a hands -free kit to use with my mobile phone in the car. Having connected it as instructed, I found that it was very loud and prone to howl -back despite the claim that proper duplex operation was provided. As a simple initial expedient I muffled the speaker by wrapping it in an old pullover. This solved the basic problem, so I knew that I needed to reduce the volume from the speaker. I opened the unit, hoping to find a volume adjustment, but there wasn't one. Having no circuit details I decided to adopt the most elementary approach, adding a resistor in series with the speaker. This worked, but I found that there was a noticeable volume variation between calls. Presumably the designer had set the volume level to cater for the worst -case communications situation in the noisiest vehicle, with the result that the average volume was excessive. Table 2: Attenuation provided by the circuit Current Lamp V Speaker V Total V Attenuation Attenuation (i, mAl ratio dB 71 0.25 0.28 91 0.5 0.36 122 1 0.49 150 1.5 0.6 175 2 0.7 197 2.5 0.79 218 3 0.87 237 3.5 0.95 0.53 0.86 1.49 2.1 2.7 3.29 3.87 4.45 0.53 0.42 0.33 0.29 0.26 0.24 0.22 0.21 5.5 7.5 9.6 10.75 11.7 12.4 13.15 13.55 LP1 Figure. 2: The lamp and speaker connected in series to provide volume compression. See Table 2. Figure. 1: Test circuit for determining the lamp's characteristics. See Table 1. R10 1852 Lamp under0 test R2D 12V 50Q0 Set V R3D 1252 Table 1: Lamp characteristics Lamp V V across R3 Lamp I (mA) 0.25 0.85 71 0.5 1.09 91 1 1.47 122 1.5 1.8 150 2 2.1 175 2.5 2.36 197 3 2.62 218 3.5 2.85 237 Lamp R (Q) 3.52 5.49 8.19 10 11.42 12.7 13.76 14.77 Solution A degree of volume compression appeared to be needed. The simplest approach would be to add a resistive device with a positive temperature-coefficiency characteristic in series with the speaker. A small bulb meets this requirement. Its filament has a low thermal capacity and hence a quick response time to signals of ranging amplitude. Some experimentation proved that a 6.3V, 0.3A bulb worked well when connected in series with the 4Q speaker. I wanted to evaluate the performance more precisely however and obtain some meaningful numbers. So I set up the test circuit shown in Figure 1. This enabled the characteristics of the lamp to be measured, see Table 1. The lamp current can be determined by measuring the voltage across the series resistor R3 and applying Ohm's Law. The voltage across the lamp can be measured directly. Knowing the voltage and the current, we can calculate the lamp's resistance at different applied voltages. This is shown in the final column in Table 1. Figure. 2 shows the lamp and speaker connected in series. Since we know the current/voltage characteristic of the lamp, we can calculate the voltage across the speaker for a given overall input voltage - the same current flows through them both. This will be an RMS calculation only, but gives a good idea of the overall performance. By comparing the speaker voltage with the overall voltage applied to the lamp -speaker combination, see Table 2, it's possible to calculate the attenuation in dB at different input voltages. The final column in Table 2 shows the results, which range from 5.5 to 13.55dB. This seems to be a sensible range and works well in practice, at the same time curing the howl -back problem. 2 62 March 2004 TELEVISION WORKSHOP EQUIPMENT GUIDE Eugene Trundle takes a look at what's good and what's new in the world of test gear and aids for bench and field servicing. There's nowadays a huge armoury of equipment for testing, fault diagnosis, repair and setting up the digital and analogue circuitry and systems we have to deal with. Part one kicks off with traditional analogue test equipment. he transition from analogue to digital Ttechnology is taking place at a rapid pace all around us. Sound and vision transmission systems, signal processing and storage, even picture display devices are going digital. We need test and diagnostic equipment to be able to cope with all this new technology. Some of what's described in this survey is PC -based, some contains digital processors and some is con- cerned with fault finding within PCs. But much of the technology that continues to play a leading role in the new millenni- um is still firmly rooted in the analogue sphere. Switch -mode power supplies, CRTs and the associated scanning circuitry are examples. Since they use considerable power, these are the most fault -prone sec- tions of equipment - and thus the ones most likely to require attention from the service technician. In fact trouble is far more likely to arise from a dried-up electrolytic capaci- tor or a poor soldered joint than from failure of a complex digital -processing chip. A considerable armoury of equipment is available for testing, fault diagnosis, repair and setting up the huge diversity of consumer electronics now in people's homes. It's used on the roof, in the customer's home and of course in the relative haven of the workshop. We'll start this guide with a look at traditional analogue equipment - the sort that's still the most used in everyday servicing. OSCILLOSCOPES The analogue scope is one of the mainstays of the TV and video repair bench. Traditional types in single -channel form with a bandwidth of 10MHz are available from Caltek at less than £100 and from Grundig and Tecstar in the £120-150 range. Another £200 will buy a dual -trace scope with a bandwidth of 35MHz: Hameg and Instek have excellent 6in.-screen models in this category, both with TV sync facilities. The Hameg model has a better Y sensitivity (2mV/div) and includes a component -test facility. Moving up the scale we find the Hameg Model HM 507, a 50MHz-bandwidth scope with a traditional look and CRT display but incorporating a digital storage facility based on a 2k x 8 -bit per channel memory backed up by a 2k x 8 -bit EEPROM for storage and reference. The realtime sampling rate is 100Msamples/sec (maximum) using an 8 -bit flash AD converter. A separate horizontal -deflection generator comes into play in the digital mode, with the scanning rate variable from 100sec-50nsec/division. This scope is priced at a very reasonable £760. Amongst a large inventory of test equipment Vann Draper Electronics can supply the Grundig Digimess range of oscilloscopes. The company is currently offering readers of Television a 20 per cent discount across this product range so that, for example, the price of Model M060, a dual -trace, 60MHz-bandwidth scope with TV triggering, becomes less than £650. Digital LCD scopes start at around the £750 mark, with the Tecstar 80MHz bandwidth model that has a 5.7in., 320 x 240 pixel back -lit display and the Tektronix TDS1000 range with a bandwidth of 60MHz upwards. Both have familiar analogue -style controls, but the physical depth is less than with a CRT -based instrument just 125mm (5in.) with the Tektronix instruments. They are also lighter to carry of course. The Tektronix TDS2000 range starts at less than £1,000. Their colour LCD screens have many advantages. Y bandwidths range from 60-200MHz with 2Gsamples/sec, 8 -bit vertical resolution and 2mV sensitivity. The digital realm includes an increasing number of PC -based scopes, some of which we will look at later in this guide - they don't have knobs or buttons! Hand-held scopes necessarily use an LCD screen. Some combine the scope function with those of a digital multimeter and a frequency counter. Their bandwidth is generally not as great as with a bench -type scope, but for certain applications in the field they score because of their lightness and portability. The simplest and cheapest are available from Velleman, with 2MHz and 12MHz bandwidths at about £100 and £200 respectively. For £140 there's the Metex 5MHz instrument that incorporates a 312 digit multimeter. At £225 you can buy the Tenma 2MHz type that also incorporates a 312 -digit multimeter and in addition a 5 digit, 10MHz frequency counter. Way beyond these, in terms of price and features, comes the Fluke Model 123. This hand-held scope/recorder/DMM, a pocket laboratory, costs about £800. 011111111111111111111 The Hameg HM1507 150MHz digital storage ocsilloscope which is priced at £1250. The Grundig Model M060 from Vann Draper. Tektronix TDS1000 and (below) TDS2000 series solid-state oscilloscopes. March 2004 TELEVISION OSCILLOSCOPES CONT'D_ MULTIMETERS COMPONENT TESTERS The Velleman HPS40 hand-held scope Colour -bar waveform displayed by a handheld LCD scope Centre - Multimeters: DMM and acessories from Grundig Right - Component testers: a Peak component tester. For various good reasons some technicians still prefer analogue multimeters. The Avo 8 is still going, now in Mk 7 form, at no less than £580. My own Avo 8 is a treasured possession that's still in daily use. At the other end of the scale, basic analogue multimeters can be bought for less than £5. These come into the 'disposable' category. They are used by field/installation technicians for simple general-purpose work, by those who install aerials and home -cinema systems and, by those who check batteries and appliances at the shop counter. Digital DMMs are the most common of course: there are probably more models and types on offer than with any other class of test gear. Once again they start at incredibly low prices, less than a tenner: auto -ranging types can be bought for less than twice that. There are now many specialist types for specific applications: for use with electrical and electromechanical gear or for automotive work; probe- and pen -types; ruggedised ones and so on. For the GP service technician the hand-held manual/auto-ranging Fluke 111 at about £100 is well worth considering, with its bar -graph indication; capacitance, frequency and 10A current reading capabilities; a buzz continuity test and 40MQ resistance range. In addition to a digital LCD readout some DMMs have an analogue bar -graph for quick assimilation of the result. Maplin's new Model M9704 at £34 (catalogue no. N26AJ) goes further, with a dual display panel that has an LCD readout and a moving -coil meter. It can measure capacitance and frequency as well as voltage, current and resistance, and can check out semiconductor devices. Tecstar has, at less than £500, an excellent new high -resolution bench DMM with a 512 -digit fluorescent display and, best, 0.012 per cent accuracy: Kenwood had a hand in this. Digital frequency meters are akin to DMMs: a new hand-held type from Thurlby-Thandar, Model PFM1300, provides frequency coverage from 5Hz to 1.3GHz despite a two -figure price tag. Both oscilloscopes and DMMs can incorporate component testers of various types. Specialist component testers generally provide more comprehensive checks and are more accurate. A couple of automatic analysers are available from Peak: one, at about £70, for passive (R, C and L) components, and one at about £50 for two and three -leg semiconductor devices. Both have a digital readout and a clever auto identification feature that enables you to connect any component under test any way round, press one key and get a readout of what the component is and what state it is in. These two models, the LCR40 and DCA55, can be bought together at just under £110 for the pair. Hameg markets an analogue component tester, Model HZ65 at about £50, for use with any scope that has X -Y inputs. It works in a similar fashion to those built into the company's own oscilloscopes, providing an on -screen 'signature' for various component types and combinations of them. With experience in use it works well. There's a whole raft of hand-held component testers, looking like DMMs but generally higher in price, with facilities for testing L, C and R components. Amongst the best - and more expensive at about £200 - is the Megger push-button Model B131. It has best accuracy of 0.5 per cent with its 4 -digit counter and has dissipation and a Q -factor readout. ABI makes auto testers for linear and digital ICs. They fit into DIL sockets, 16 -pin and 40 -pin respectively, and have in-built libraries for automatic device recognition, indication and testing. Prices are £380 and £330 respectively. I feel that the DIL-package limitation is a serious one these days. Personally I find that the most useful component tester, one that's used on average several times a day in my workshop, is an ESR meter for testing electrolytic capacitors in situ. Two well -established instruments of this type are the Electronic Design Specialists' model with microprocessor control and a 20 -segment LED readout, at £175, and the Capacitor Wizard from SEME at £146. Both are effective and very useful. The EDS model automatically dumps any charge in the capacitor before testing it: if a charged capacitor blows up the Capacitor Wizard you can buy a £10 repair kit. It's not necessary to spend lots of money on an ESR tester: see the DIY kit section in Part 2 next month. 264 March 2004 TELEVISION Soldering, and desoldenng station The Ersa SMT 60 Soldering and De -soldering Station from Blundell makes easy work of hand soldering or repairing printed circuit boards. A wide variety of interchangeable Tips can be operated, all of which can be held by the SMD 8012 Tip Holder so you can quickly choose the Tip which best suits the application. The Handsets heat up in a matter of seconds, with Tips taking only a few seconds to change. The Hot Tweezers enable you to get into tight spaces making fast work of De -soldering and removing faulty components. Also included is a cleverly designed Drag Soldering Tip which makes easy work of replacing large J -Leaded components. BLUNDELL PRODUCTION EQUIPMENT 203 Torrington Avenue, Coventry CV4 9UT, England. Tel: 02476 473 003 Fax: 02476 694 155 Email: [email protected] www.blundell.co.uk RECEPT I ON TEST I NG The Swires Research Digi-Sat 2001 reception tester The Promax Prolink 4C provides this constellation display The Prodig 1 digital Satellite Hunter from Promax The Televes on -screen indicating Model MTD50. Right: A simple, inexpensive satellite signal strength meter from Televes While the need for convergence -adjustment crosshatch generators has fallen off, it is quite the reverse with reception testers. The terrestrial and satellite bands have become busier and more crowded with transmissions, digital and analogue, and optimising reception is now an exacting business. This is especially true of terrestrial digital broadcasting, where the early (pre -broadcast) promises of rugged transmission and reliable reception have proved to be false and concepts like 'graceful degradation', in which picture quality is related to bit -error rates, have been discarded. Hence the need for instruments that show not only the signal strength but also identify the programme source and indicate quantitatively its received goodness - in terms of bit -error rate and carrier -to -noise ratio. There are now several of these precise and complex instruments to choose from, but not at the price of the old "wow: stop now" meters. We'll consider first those designed for terrestrial DTV use: in the UK this currently means Freeview reception. While there are some cheap 'n' cheerful `basic' meters for checking satellite signals the same doesn't seem to be the case with terrestrial testers, where the start point is at about £260 with the Lacuna type TM2 from Coastal Aerial Supplies. It is small and light with facilities for testing analogue and digital signals, in the latter case identifying the transmitter (UHF or VHF) and giving strength, carrier -to -noise ratio and BER (Bit Error Rate) readouts via a backlit 4 -line LCD display. It works from 12V line power or internal, rechargeable batteries. The Horizon HDTM is similar in nature and function though larger and thus not easily hand-held. This one has its own mains charger and costs about £320. Another £60 or so will buy you the similar looking IN01360 type from CPC. This one has a 2 -line LCD readout with backlight and also incorporates a built-in demodulator and speaker for TV sound identification together with sophisticated 'package flatness' and channel -interference indications. The IM Digi-T 203 from Swires Research, at £269, also comes into this category. This hand-held instrument with six control keys and a 2 -line LCD indicator measures analogue and digital signals in the VHF and UHF TV bands and gives BER and C/N ratio readouts. A new hand-held terrestrial analogue and digital tester from CPC at £343, type IN04114, has span and spectrum displays plus BER and C/N ratio indications from its LCD display. It can also cope with the high-QAM modulation system used with cable networks. There are still very simple satellite signal testers, though these are confined to non quantitative strength measurement. The LevelMeter costs £30 and does its stuff with a row of LEDs and an audible level indicator. The Digisat types are similar, but with LCD indicators, while Televes and Promax have pointer -and -scale types at £45-£50. Something better is required for serious work however. At the lower end of the price scale rivals Horizon and Lacuna have, as with terrestrial meters, similar models at about £250 apiece, neck -hung in one case and hand-held (the 'yellow bone') in the other. Both provide 2 -line LCD readout of signal strength, BER and C/N ratio, and both are pre-programmed with data per existing satellite. Here too Swires Research has a similar product, the hand-held Digi-Sat 2001, which gives three -hours operation with batteries and reads out via a 2 -line LCD screen signal strength, BER and C/N ratio for 19 pre-programmed satellites. Price is £240. The Prodig 1 from Promax is more sophisticated than these and of course more expensive. This 3 -key, 3 -step Satellite Hunter costs £375. From these LCD -readout types we move up to ones that provide, on a monochrome or colour screen, actual satellite TV pictures and, more important, a spectrum display of the SHF band. In the Promax range they start at about £800 and, with increasing features, benefits, bells and whistles, end up with the Prolink 4C, which has a colur LCD picture/display panel, at £2,250. It's ideal for watching GMTV as you sip your coffee astride the ridge tiles, and also has terrestrial signal -testing facilities. The Perifelec Model MC30 at £1,100 is also in this 'dual -standard' category. It has monochrome -tube and alphanumerical displays, internal channel/frequency memory and 4 -band coverage. Unless you confine yourself to either terrestrial or satellite work, which is rare except perhaps for Sky contractors and specialist satellite traders, a dual -standard meter might be the best option. It can cost less than the alternative two separate instruments with similar specifications. I've already mentioned the top -end dual -standard Promax Prolink 4 and the Perifelec Model MC30, which both have panoramic monitor screens. There are more contenders in this sector of the market. The Televes Model MTD50 has a 412 in. monochrome CRT display for picture and spectrum, a 5 -digit LCD frequency readout and the ability to measure analogue signal strength, digital channel power and C/N ratio, covering 48-856MHz and 9502,050MHz. It costs over £1,000. If you want the same type of instrument in terms of screen size/type and frequency coverage, plus the ability to measure and indicate BER with QPSK modulation, the new IN04115 signal analyser from CPC does the job at about £1,200. This and the Televes model both have an audio tone indication of signal strength to facilitate eyes -off antenna alignment, and both are neck -hung with internal rechargeable batteries. The Promax MC377+, a long-standing and popular type at £800, is similar to the Televes MTD50. The Promax range also includes the Prolink 2+ with QPSK BER measurement for satellite TV at £1,200, and the Prolink 3+ with on -screen rather than LCD readout of all measurements and BER indication for COFDM, QAM and QPSK modulation at £1,800. 266 March 2004 TELEVISION FROM HAMFn SPECIAL OFFER Call our number below and quote "TELEVISION" magazine Analogue & Analogue/Digital Oscilloscopes from 35MHz to 200MHz, 2GS/s... Signal Generators & Measurement Systems from DC to 1.2GHz... Sfropemct1ruGmHAZntaoly3s.e3rGs H&zT.r..a.c*k"e4rs* All With Two Year Warranty. HAM EG UK LIMITED 78 SINGER WAY. KEMPSTON. BEDS. MK42 7PU Tel: 01234 856345 Fax: 01234 856100 e-mail [email protected] bility practicability professionality multiple/ter ein Indispensable I dill Installer's TOOT THE ULTIMATE RANGE FIELD STRENGH METERS (FSM) 3 or 5" TFT screen High resolution 0.1dB High accuracy +-1dB MAN & 4-2SAT C/N measurement (analogue and digital measurements) Up to 4hours battery Shock protection (rubber) Quick menu keys RS232 & Scarf sockets Easy and friendly to use eria MOTele* U.K.LTO T 01633-875821 F 01633- 866311 televes.uketeleves.com Televes www.telenes.coin TELEVISION March 2004 Almost everything you need for your business under one mouse CPC have over 100,000 top quality products online, ranging from spares and components to computing, audio, video, cables, connectors, electrical, security components, tools, in the work place and test equipment all available in just two clicks. www.cpc.co.uk 267 PATTERN GENERATORS Top: The Promax GV998 MPEG-2 DTV pattern generator. Centre: Twins - the Hameg triple low voltage PSU and programmable DMM Bottom: Grungig bench -type variable PSU from Vann Draper. There was a time when a pattern generator was an essential part of a field technician's kit. We've still got Labgear ones stashed away here, used for setting up delta -gun tube beam registration thirty odd years ago! There's less need for convergence and purity setting now, but a pattern generator is still very useful, especially after replacement of data -memory chips and components in CRT -scanning circuitry. The ultimate pattern generators in our sphere are perhaps the Promax GV series ones. There's a whole range of these instruments, culminating in the analogue Model GV898 with a widescreen (16:9) test card and vestigial-sideband RF operation. It has options for 14:9 aspect ratio, teletext and Nicam functions and multi -standard operation. Prices range from £433 to over £2,500 depending on the class of instrument and the options required. Alban has beaten everyone else I know to the market with a multi -standard MPEG-2 digital TV pattern generator: Model GV998 simulates DTV transmissions. In the analogue hand-held range Promax offers Models VG90 and GC981, the latter with a circle in its repertoire of patterns, at £210 each. Competition in this portable realm is provided by the well -established Ozan Teletest 2 and Teletest Pro instruments, at £170 and £240 respectively. Neither can generate on -screen circles or comprehensive broadcast -style test cards however. That's left to the small, rugged Burosch Model TPG-1 at £190, the cheapest ready-made instrument that I know of with this capability. But you don't have to spend three -figure sums to get broadcast -type test cards now! See the DIY kit section in Part 2 for further details. POWER SUPPL I ES A bench -based DC power supply unit is virtually indispensable. Ideally it should have variable voltage and current limit controls and a readout of voltage and current. A maximum voltage of 15 or 20V with say 4A capability covers most everyday requirements, with myriad uses - driving little motors, testing zener diodes, powering amplifiers and valve heaters, operating portable audio and video gear, substituting for dead sections of equipment power supplies and so on. Such units have long been around and there's a lot of competition between manufacturers and retailers. For many years I have been served well by a 0-15V 4A unit with dual LED indicators for voltage and current and rotary control knobs for each. If you are prepared to settle for analogue meters some very good value -for -money units are available. For example the CPC IN00702 provides a variable 3-15V regulated output with 6A capability (but no current -limiting control) for as little as £50; a similar job that runs to 30A costs £114. £60 will buy you a variable 0-30V, 2.5A regulated supply with adjustable current control, CPC code IN00701. Tenma has a wide choice of excellent bench PSUs. They range up to 30V at 10A, in single- and triple -output versions, with a choice of digital or analogue voltage and current readouts. GW Instek offers 30V, 3A bench PSUs with coarse and fine voltage and current controls: with analogue meters they cost £150 while with LED numicators the price is £200. You sometimes need to simulate a 12V lead -acid battery and, especially when servicing in -car equipment, draw a lot of current. There are 13.8V units in the Maplin Palstar RP range: the RPO7H (4A) at £21, RPO8J (6A) at £30 and RPO9K (15A) at £68. They have foldback current protection. The 4A and 6A units have a cigar -lighter style output socket alongside their 4mm output sockets. 268 March 2004 TELEVISION APPL I ANTE SAFETY CI-iECKS Safety testing of consumer electrical and electronic equipment is an important aspect of our service industry. Where people's lives are at stake there is no room for compromise or guesswork, and the law comes down very heavily on anyone who is responsible for accidents. The primary requirements are: to ensure, in the case of anything that has exposed metal of any sort, that there is good insulation between this and the mains connections; that anything with a third (earth) connection to its mains lead has a low impedance path between exposed metal and earth; and, in the case of microwave ovens, that energy radiation leakage is not excessive. Appliance testers can be expensive, though again there's a cost-effective DIY solution, see Part 2. Prices of commercially available instruments start at about £200 for Seaward's long- established PAC500 and PAC500+ models, which have single push-button operation and simple pass/fail indication. For insulation, the test potential is 500V DC with a 2MQ pass threshold, while the earth -bond test is made at up to 25A with pass levels of 250mQ or 300mQ. Seaward's products range up from there, with increasing features and benefits. Model 500H at £320 has quantitative readouts and IT -equipment `friendliness'. The Europa PAC looks a bit like a DMM but has a higher price tag at £560. Flagship Model Supernova Plus at just over £1,000, with matching software packages available for an additional £450-£500, has a full graphics display, a qwerty keyboard, non-volatile flash memory, provides every sort of safety test and has PC connectivity. Megger also specialises in PAT testing. Model PAT32, with quantitative LCD panel readout and an IT -equipment compatible (100mA constant -current) earth -continuity test, is available at £580. The all -singing, all -dancing Model PAT4DVF, with flash test, costs a little over £1,000. Robin is the third main contender in the PAT market, with a range of instruments that reaches its peak with the SmartPAT 5000. Its specification is similar to the top -end models from Seaward and Megger and, you guessed it, the cost is just over £1,000. You can even get, from Farnell, a gadget to test your appliance tester! It costs £10.23 and can be obtained under order code 428-3442. I haven't seen any means of testing this item but, if there was such a thing, its cost in proportion would be just under 11p. How would you know if it had broken down? Returning to reality, and to microwave oven testers, you find that two types are generally available, with calibration traceable to national standards and readout in mW/cm2. The Caltek A100, with power -measurement capability, costs about £160; the CPC IN00096 confines itself to leakage testing and costs a more modest £116. VCR FAULT F IND ING TV TEST I NG Most VCR fault diagnosis and repair can be carried out with the equipment described elsewhere in this guide. The exception to this - and about the only place where there are still any adjustments to be made - is of course the mechanical deck. SEME's MB -SWISS 4 test tape at £23 provides wide-ranging test facilities: it can check tape back -tension, head -switch gap point, video head tracking, ACE head X and Y alignment, and video head wear. The only feature it lacks is a 6kHz audio tone for ACE head tilt adjustment. This can be found, along with the other facilities mentioned above, on the Burosch OSD-AT test tape which sells for £24. Burosch also produces a test -pattern service tape; type VST-30, at £14; and a Video -8 version with five test patterns and stereo sound at £30. Skeleton cassettes in VHS and 8mm form, for sight and access to deck mechanisms and components, can be obtained from CPC at £9 apiece. They are also useful for investigating the causes of tape -chewing. Much of what is described in this guide is applicable to TV servicing of course. Test gear that's dedicated to TV applications is all, in one way or another, related to the CRT and its attendant circuits. For measuring the very high accelerating voltages that CRTs use there's a choice of stand-alone instruments like the Tenma one that reads up to 40kV, at £50; and attenuating probes, for example the Tenma and Fluke 40kV types, at £35 and £120 respectively, for use with an ordinary DMM. Just thirty three years ago in the February 1971 issue of Television I described how to build an EHT meter on the cheap. I've still got it, and.it still works! These days the EHT potential is developed by voltage multiplication within the line output transformer, a component whose failure is common but not always easy to diagnose. The HR LOPT tester, at about £80, comes to the rescue here. It tests LOPTs dynamically, in situ if necessary, with an LCD panel EHT voltage readout and waveform indication by using a separate scope. A version for testing PC monitor LOPTs, which run at higher fiequencies, is available at about the same price. The CRT itself is generally reliable but can of course fail or lose emission. When there's an internal failure, for example inter -electrode leakage or a short-circuit, the highly -nervous overload trip and/or auto grey -scale arrangements in modern TV sets can thoroughly confuse the issue. Hence the need for a tube tester. The main players here are Promax, with the RT901 single -meter tester/rejuvenator at £260; and BMR, with Model 2005, a four -meter job that provides simultaneous readouts for the R, G and B guns and rejuvenation, at about £550. The famed B&K tube tester is no longer available, but tube base sockets can still be got for it - at a price. Mains -operated degaussing wands are available from SEME (TEST 619 at £34) and CPC (IN00705 at £38). March 2004 TELEVISION 269 PCB SERVICINIG Above: PCB testing with a conductive brush and probe. Right: the BMR Model 2005 CRT tester. PCBs are becoming smaller, along with the components on them. Apart from soldering and rework equipment, which we will consider next month, there's a range of test gear for tracing faults in and associated with PCBs. A shortcircuit on a board or in a component connected to many others that share a track, for example a 5V line, can be difficult and time-consuming to locate. A very low -resistance reading instrument with a test -tone indication is required here. Two types are available from CPC. The IN02003 has a stainless steel brush and needle probe, with a 500mV test potential at a maximum current of 1000A. This hand-held device is priced at £35. Type IN01793 is similar but with two needle probes. The audible tone, from an internal sounder and at a 3.5mm headphone socket, falls in frequency as the trouble -spot is approached, working with track resistances from zero to 250m52. This one costs £52. An alternative to these specialised instruments is perhaps to use a pukka milliohmmeter that can read down to 0-1mQ. But at a cost of £200+ it would be difficult to justify buying such a unit for this purpose alone. To penetrate the lacquer on very narrow PC tracks you need really slim and sharp needle -pointed probes. I have yet to find these in any catalogue (does anyone know of such items?) and make my own either using real sewing needles or taking commercially -available probes to the grindstone. SPECIAL OFFERS JUST IN TEKTRONIX 2445A 4 Ch ONLY 150MHz Delay, Cursors etc. Supplied with 2 Tektronix probes <MO TEKTRONIX 2232 Digital Storage Scope. Dual Trace 100 MHz,100m/s with probes. £525 H.P. 54501A Digitizing Oscilloscope100MHz, 4Ch.£425 CIRRUS CRL254 Sound Level Meter with Calibrator, 80-120dB, LED £95 BECKMAN HD110 Handheld 31/2 digit DMM, 28 ranges with battery, leads and carrying case £30 WAYNE KERR 8424 Component Bridge £50 RACAL 9300 True RMS Voltmeter 5Hz-20MHz usable £50 to 60Mhz 10v -316v RACAL 9300B as above £75 H.P. 3312A Function Gen 0.1Hz-13MHz AM/FM Sweep/Tri/Gate/Burst etc £300 FARNELL AMM255 Automatic Mod Meter 1.5MHz- 2GHz Unused £300 FARNELL DSG1 Low Frequency Syn Sig Gen 0.001Hz to 99.99kHz. Low Distortion TTUSquare/ Pulse Outputs etc £95 FLUKE 6060A Handheld True RMS DMM 41/2 digit As new £150. Used £95 H.P. 3310A Function Gen 0 005Hz-5MHz Sine/Sq/TrV Ramp/Pulse £1 FARNELL FLM4 Sine/Sq Oscillator 10Hz-1M distortion. TTL Output. Amplitude M H.P. 545A Logic Probe with and 547A Current Tracer . FLUKE 77 Multimeter 31/ £60 FLUKE 77 SERIES II £7 HEME 1000 LCD Clam r 00 In Carryin. Case £60 BLACK STAR ORION PAL/TV VIDEO Colo ttern Generator fro 125 THURLBY/THANDAR TG F rator 0.002HZ-2NHZ TTL etc £95 THURLBY THANDAR PSU Twice (Late colours) Racal 9008 £200 LY41=10 Automatic Modulation Meter M/FM 1.5MHz2-2GHz Dairen 10618 High Quality 61/2 digit Bench Multimeter True RMS/4 wire/Current Converter H.P. 8640A SIGNAL GENERATOR AM/FM £250 500KHZ-512MHZ. KENWOOD CS4025 Oscilloscope Dual Trace 20MHZ £125 LEADER LB0523 Oscilloscope Dual Trace 35MHZ £140 GOULD 05300 Oscilloscope Dual Trace 20MHZ £95 NATIONAL PANASONIC VP7705A Distortion Analyser £125 KENWOOD VT176 MIIIIvoltmeter 2Channel £50 KENWOOD FL140 Wow & Flutter Meter £50 KENWOOD FL180A Wow & Flutter Meter Used £75 Unused £125 BIRD 43 Watt Meter £75 Elements for the above £25 MARCONI 893C AF Power Meter, Sinad Measurement. Unused £100 Used £60 MARCONI 8938 - No Sinad £3 MARCONI 2610 True RMS Voltmeter Autorangin 5Hz- 25MHz £195 GOULD J3B Sine/Sq Osc. 10Hz-100kHz. Low ion 25 AVO 8 Mk6 In Ever Ready Case, with lea £80 Others Avos 50 GOODWILL GVT427 Dual C in 12 Ranges Freq 10Hz 1MHz 100-£125 SOLARTRON 7150 DM It a RMS - IEE £95- SOLA 5 50 PLUS ALITY RACAL CO Counter. 50MHz. 0Hz-520MHz . £75 nter, 10Hz 560MHz, £50 'AIM 9343M, Automeas ents HUNTRON E MARC' A n AP60/150 3 ' £2000 NELL AP100/9r £2000 H.P. 60128 DC PS £1000 FARNELL AP60/50 nging £1000 FARNELL H60-/50 0- 50A £750 FARNELL H60/25 0-60V; 0-25A £400 Power Supply HPS3010 0-30V; 0-t0A £140 FARNELL Dual PSU XA35-2T 0-35V 0-2A TWIN OMD LCD Display £180 FARNELL L30-2 0-30V; 0-2A £80 FARNELL L30-1 0-30V; 0-1A £60 Many other Power Supplies available. Isolating Transformer 240V In/Out 500VA £40 STEWART OF READING 110 WYKEHAM ROAD, READING, BERKS RG6 1PL Telephone: (0118) 9268041 Fax: (0118) 9351696 www.stewart-of-reading.co.uk Callers welcome 9am-5.30pm Monday to Friday (other times by arrangement) Farmell DTV 12-14 Dual Trace 12 MHZ TV. Coupling ONLY £75 FARNELL LFI Sine/Sq OSCILLATOR 10HZ- 1MHZ ONLY £75 OSCILLOSCOPES TEKTRONIX TDS350 Dual Trace 200MHz 1G/S unused TEKTRONIX TDS320 Dual Trace 100MHz TEKTRONIX TDS310 Dual Trace 50MHz 20 LECROY 9400A Dual Trace 175MHz SG/S HITACHI VC6523 Dual Trace unused PHILIPS PM3092 2 New £950 PHILIPS PM3082 242 700 As New TEKT I .MHz Delay etc z Delay Cursors etc OMHz Delay C rs etc Storage D ce 100 £450 466 Anal al Trace £250 T ONIX 485 D Tra D weep £550 TEKTR IX 47 TEKT X 4 115-1 a Delay Sweep £350 Hz Del weep £325 TR u ce 60MHz Del £250 PHTEKU Ch. 100MHz B/Delay £375 S P 5 21.1 Ch. 60M toset PM3217 Dual £275 200-£250 ULD 051100 Dual £125 AMEG 303 D Hz Component Tester As Ne £240 HAMEG 30MHz Component Tes £200 CILLOSCOPES AVAILABLE Freq Synthesizer 6747A-20... ....... £5000 - Hz ONI 2022E Synthesised AM/FM Sig Gen .£525 - £750 Hz - 1.01GHz LCD Display etc 8657A Syn 100KHz - 1040MHz Sig Gen £2000 .P. 86568 Syn 100KHz - 890MHz Sig Gen £1350 H.P. 8656A Syn 100KHz - 990 MHz Sig Gen £995 R&S APN62 Syn 1Hz - 260KHz Sig Gen £425 Balanced/Unbalanced Output LCD Display PHILIPS PM5328 Sig Gen 100KHz - 180MHz with 200MHz £550 Freq Counter IEEE RACAL 9081 Syn AM/FM Sig Gen 5MHz - 520MHz .1250 H.P. 3325A Syn Function Gen 21MHz £600 MARCONI 6500 Amplitude Analyser £1500 H.P. 4192A Impedence Analyser £5000 H.P. 4275A LCR Meter 10KHz - 10MHz £2750 H.P. 8903A Distortion Analyser £1000 WAYNE KERR InductanceAnalyser 3245 £2000 H.P. 8112A Pulse Generator 50MHz £1250 MARCONI 2440 Freq Counter 20GHz £1000 H.P. 5350B Freq Counter 20GHz £2000 H.P. 5342A 10Hz - 18GHz Freq Counter £800 H.P. 1650B Logic Analyser 80 Channel £1000 MARCONI 2305 Mod Meter 500KHz - 2Ghz £750 H.P. 60638 DC Electronic Load 3 -240V/0 -10A 250W P.O.A. H.P. 66312A PSU 0 - 20V/0 -2A £400 H.P. 66311B PSU 0 -15V/0-3A £400 H.P. 663090 PSU Dual 0 - 15V 0 -3N0 -12V 0-1.5A £750 H.P. 66326 PSU 0 - 20V/0 -5A £500 H.P. 6623A PSU Triple Output ranging from £850 0-5A to 0-20V 0-4A Bent 34401A DMM 61/2 digit £4005450 78A DMM 5 /p digit £275 45 DM ual Display £400 THLEY 20 M 7 /2 digit £950 KEITHLEY mmable Electrometer £1250 H.P. 4338r er £1500 RA' 92.6 GHz £500 31A 3GHz £850 3120A Function Gen/ARB £900/£1000 z - 15MHz EKTRONIX AF6320 Arbitary Function Gen..£1250 .P. 8904A Syn Function Gen DC - 600KHz £100051250 BLACK STAR JUPITOR 2010 Function Gen 0.2Hz - 2MHz. with Frequency Counter £140 H.P. 8116A Pulse Generator 1mH-50MHz £1950 H.P. 8657B Syn Signal Gen 01-2080MHz £2500 CO -AXIAL SWITCH 1.5GHz £40 IEEE CABLES £10 H.P. 8720C Microwave Network Analyser 50Hz - 20GHz £12500 H.P. 85618 50Hz - 95GHz H.P. 8560A 50Hz - 2.9GHz Synthesised H.P. 8594E 9KHz - 2.9GHz £5000 £5000 £4500 H.P. 8591E 1MHz - 1.8GHz 75 ohm H.P. 853A with 8559A 100KHz - 21GHz £2750 £1750 H.P. 8558B with Main Frame 100KHz - 1500MHz F750 H.P. 3585A 20Hz - 40MHz £2500 H.P. 3580A 5Hz - 50KHz £600 ADVANTEST R41318 10KHz - 3.5GHz £2750 EATON/Aiitech 757 0.001 - 22GHz £750 MARCONI 2382 100Hz - 400MHz Mph Res £2000 MARCONI 2370 30Hz - 110MHz from £500 H.P. 182 with 8557 10KHz - 350MHz £500 H.P. 1417 Systems 8553 1KHz -110MHz £500 8554 500KHz - 1250MHz £750 8555 10MHz - 18GHz £1000 H.P. 8443 Tracking Gen/Counter 110MHz £250 H.P. 8444 Opt 059 £750 B & K 2033R Signal Analyser £650 H.P. 8754A Network Analyser 4MHz - 1300MHz £1250 H.P. 3577A Network Analyser 5Hz 200MHz £3000 H.P. 53310A Modulation Domain Analyser Opt 001/003 £5000 ONO SOKKI Portable FFT Analyser £1500 RADIO COMMUNICATORS TEST SETS MARCONI 2955/2955R from £1000 Rohde & Schwarz CMT 0.1 - 1000MHz £1500 Schlumberger 4040 £750 USED EQUIPMENT - GUARANTEED. Manuals supplied. This is a VERY SMALL SAMPLE OF STOCK. SAE or telephone for lists. Please check availability before ordering. CARRIAGE all units £16. VAT to be added to total of goods and carriage. 270 March 2004 TELEVISION 14" CTV R/C FROM I £29.99 20" CTV R/C 28" WIDESCREEN 32" WIDESCREEN FROM Mi LI RIC TEXT FROM!, RIC FROM 1 07.99 £99.99 £199.99 TECHNIKA MULTIREGION DVD FROM I 124.99 MN I VCR'S FROM DVD'S FROM KE14P2B I SPEACIAL!! t 641 14"TvNcr Combi £16.991 £54.99Fro Panasonic INFLATABLE KXF P155 Speakers From talaNk#. Plain Paper Fax Brand New!! £59.99 01 2.50 Hitachi Radio Alarm Clock SONY DAV-S888 *Sony Dvd Home Cinema *Dvd/Cd/Cdr/CdrwIMp3 Playback *6 Speaker System *Total 600W: 100W x 5100W RMS (10% THD),12 Months Warranty, £497.99 TECHNICS SCHDV560 SPEACIAL!! *Technics Compact Component Stack System *CD,Tape,Tuner *Input select £199.99 *Silver w/Broym Side Panels DANSAI MULTIREGION DVD FROM =ibis -1:1' £2199 OMICRON HALOGEN HEATER Halogen Technology Instant Heat Variable Heat Settings Low. Medium & High Thermal Safety Cut Out Stabil ty Safety Cut Out Double Safety Grills Low Running Costs Oscillating Fealur Brand New!! Only 15.99 INTERCOM SECURITY SYSTEM 'Bel camera and full Accessories included `Additional camera sold separate 'Infra Catmo,ReedrasouffoorrdNight vision k-, 'optional electric door latch activation *Switch Between camera with NB switch 'Two way speech *250 metre cable £34.99 *Audio/visual output MURPHY RICHARDS 2 SLICE TOASTER MIPS FWC115 MICRO MR POP ItKARAM MAMIE FEST AIM MCD-1050 MICROMR MTN MI Mil RIB AIMBIAM011118 MIMI III SYSTEM 0 £7.49 £39.99 £84.99 £44.99 £29.99 TECHNICSSP-96 Nairn Dishwasher Panasonic HITACHI HITACHI 0 00 NDWOBO NVGS1 OB Cv800/81 0 HTDK150EUK 1INIO NEW!! Ii SIMINWIll RIMERS SIM! £13.99 £49.99 n69.99 £16.99 £119.99 WWW,TRADEELECTRONOCCO.UK [email protected] NEVI MORE TV'S VCR'S DVD'S HIFI'S ETC IN STOCK!! All Goods are Graded unless otherwise stated ,Goods are subject to Vat, carriage & availability Prices subject to change without prior notice Trade ElectroniX 30134 River street Digbeth 8'ham 85 5SA TO:0121 773 3300 Fax 0121 773 2300 Servicing the Philips LO1 chassis The Philips LO1 chassis can drive 14 to 32in. tubes with 4:3 or 16:9 aspect ratio displays. It's based on the Philips Ultimate One Chip (UOC), an 80 -pin IC that acts as the microcontroller and signal processor. Brian Storm describes the circuitry used, the service modes, and lists some known faults The Philips LO1 was designed as a global 50Hz chassis able to drive 14 to 32in. tubes with either 4:3 or 16:9 aspect ratio. There are 100 UHF channel presets and 40 FM radio channel presets the aerial cable for the latter plugs into a small three -pin socket beneath the UHF aerial input. The version of the chassis used in smaller sets (14-21in.) is designated L01.2, the version for larger -screen sets (up to 32in.) being designated L01.1 The chassis is based on the Philips Ultimate One Chip (UOC) IC that acts as the microcontroller and signal processor (sound, video and deflection). The chip was mentioned in a previous article in these pages on the Panasonic Z8 chassis. This time the QFP80 quad flat -package version is used. The 80 -pin, surface mounted chip is fitted on the underside of the main PCB. Its part number varies with model and thus the features required. It's important to appreciate this, as changing an 80 -pin, surface -mounted device two or three times is no laughing matter. Stereo sets are fitted with an MSP3415G multi sound processor. The UOC IC requires a 3.3V supply for the microcontroller section and an 8V supply for the signal processing stages. It provides the following functions and processing: main microcontroller; onscreen display generator; teletext processor; RGB processor; video processor; video input switching; sound input switching (mono sets); sound demodulator (mono sets); video demodulator; colour decoder (multi standard); line timebase generator; field scan driver; EW driver. Power supply circuitry The chopper power supply, see Figs. 1 and 2, is based on the popular TEA1507 control chip (IC7520), a so-called second -generation green chip. This 8 -pin dual in -line IC is designed to maximise power efficiency in all operating modes. A special feature, called the burst mode, can be used for low -power standby operation. In this mode the chip produces controlled bursts of switching signals to operate the chopper power supply in a low -power condition, producing just enough power to maintain the 3.3V supply for the UOC device. IC7520 receives a start-up supply at pin 8 via R3532. This is obtained from the mains rectifier and, via an internal current source, charges C2521. During the start-up sequence C2522 provides a soft -start action. Pin 1 of IC7520 can be taken low to activate the burst mode, though it's not done in this way in the LO1 chassis. Once the start-up sequence has been completed IC5720 is supplied from winding 8-9 on the chopper transformer T5520 via rectifier diode D6520, with C2521 as the reservoir capacitor. To achieve a high operating efficiency the chassis uses a variable -frequency, quasi -resonant flyback -converter chopper arrangement. Pin 4 (demag) of the IC7520 monitors the transformer's feedback winding (pins 8-9) pulse by pulse for control and protection purposes. Variations in the load on the supply are fed back to pin 3 of IC7520 via the optocoupler IC7515. Monitoring is based on the circuitry around transistor Tr7540 and zener diode D6540 on the secondary side of the circuit. This monitors the 140V HT feed to the line output stage. An increase in the HT voltage increases the current through the optocoupler. Transistors Tr7541 and Tr7542 are used for standby switching. When a standby command is received the UOC activates this circuit. IC7520 detects the condition, which it interprets as a drastic overload, switching to the burst mode for safe operation. Transistor Tr7522 on the primary side of the circuit is used to protect the chopper FET Tr7521. If there is an overload on the transformer, shorted turns or mains input spiking Tr7522 switches on temporarily, removing the drive to Tr7521. Primary side excess current is monitored by resistors R3526 and R3527. The voltage developed across them is fed to pin 5 (sense) of IC7520. Should the voltage exceed a preset level, current limiting is activated. In the standby mode the main 12V supply on the secondary side of the circuit provides enough power for the 3.3V regulator IC7560 to maintain the supply for the UOC. The degaussing control circuit is powered by the auxiliary 13V supply derived from the line output stage, so degaussing is activated when leaving the standby mode. The degaussing relay driver transistor Tr7580 switches on initially, closing the relay. A timing circuit, consisting of R3580 and C2580, is connected to its base. When C2580 has charged (4 seconds) Tr7580 switches off, releasing the relay. The 13V line supplements the 3.3V supply via R3565 and D6565 when the UOC is active and thus drawing more current. 272 March 2004 TELEVISION R3503 C2516 02515a7 470 33n R3510 0.1 1M5 o Mains input D6500 GBU6J C2503 2n2 2n2 330 C2508 EIN 470p0 1kV 3 4 fRLY1515 * Fusible 5 Non -isolated chassis Degaussing coils R3532 2k2* Isolated chassis R3504 7 220 R3523 47* 6 AAA C2525 R3525 8k2 Tr7521 0 STP7NB6OFP R3530 10k R3524 56k L5621 11 C2523 1n20 2kV T5520 11 11 11 11 11 11 11 11 11 3M3 --R3528 100AAAr-- D6522 20V ' 0.47 l=1C2521 3M3 22 R3522 II- 330k 1n R3521 10 41--114--/V\Ar D6520 BYD33D Tr7522 BC847B C2522 a01 47k D65231 1N4148 iR3531 4k7 R3526 R3527 0.22 0.1 n D6524 1N5062 D6525 1N5062 11 11 17V 3 la100 1 k2 IC7515 270 TCET1103G Fig. 1: The circuitry on the primary side of the chopper power supply. An excess -current circuit based on transistors Tr7561, Tr7562 and Tr7564 is connected to the 12V line. Tr7561 is normally switched off by the negative bias at its base, provided by D6563 and D6567 (4.7V zener diode). Should the voltage developed across the monitoring resistor R3564 rise sufficiently, all three transistors switch on. Tr7561 sends a power -down indication to the UOC and, via Tr7450, overloads the EHT monitoring circuit in the line output stage, with the result that the set reverts to standby. The power -down indication tells the UOC that part of the set has lost power and it will have to reprogram any slave processors and send out resets once power has been restored. The line timebase The line output stage is fairly conventional but the line driver stage is somewhat unusual, see Fig. 3. The drive waveform from pin 30 of the UOC is fed to the base of buffer transistor Tr7462, then to the complementary -symmetry driver transistors Tr7461 and Tr7463. A matching transformer, T5461, applies the drive to the base of the BU4508DX line output transistor Tr7460. Larger screen sets incorporate an EW correction circuit that consists of an STP3NC6OFP FET, Tr7400, and associated components. There's a protection circuit for Tr7400, based on zener diode D6401 (its voltage rating depends on the tube). This circuit operates should the EW loading coil start to fail and allow high -voltage flyback pulses through to the EW drive circuit. When D6401 conducts it earths pin 80 of the UOC via transistor Tr7606 and the set reverts to standby. A relay driven by transistor Tr7444 is included on the primary side of the line output stage. This is for the 'super -wide' mode, which is available from the aspect mode selection. Super -wide is the Philips version of a smart aspect that seeks to fit a 4:3 picture into a 16:9 display with the minimum of apparent distortion, satisfying customers who dislike seeing black bands at the sides of the screen. The relay modifies the scan -correction by switching March 2004 TELEVISION 273 C2516 10 12 I H-1n D6561 SB340 X BAS216 RLY1515 R3580 100k BAS216 Tr7580 BC 8 57B C2580 47 C2581 722 R3565 330 D6562 EGP2OGL 470p C2564 2,200 16V Audio supply 100 earth 3k9 R3564 0.33 68 C2566 47 Tr7562 R3561 100 D6563 6B-A-S2-16141---AA10Ak "- 0.1 6.V D6567 4.7V niTin R3558 330 R3557 1k IC7560 L78 L33 D6565 BAV70 .T. 02567 47 8 13V ° from LOPT 12V 3.9V 3.3V ...Power down Tr7561 PDTC143ZT /TT 470p D6560 BY229X-600 = C2561 47 IC7515 2 R3549 470 D6541 20V R3542 1k5 R3541 470 From D6467 See Fig.3 8k2 15n 1n5 113543 120k 140V iD6540 6.2V Tr7540 BC547B R3545 39k R3544 4k7 R3569 10k R3566 2k2 D6570 6.8V Tr7541 PDTC143ZT Tr7542 BC857B R3552 22k D6569 BAS16 14 C2568 0.47 D6566 1N4148 0.1 Stdby con 274 March 2004 TELEVISION in some extra capacitors with D6467 BAV70 carefully -selected values. The result is to give a non-linear stretch to the 4:3 image. 13V from LOPT D6468 C.. 12V from power supply Pin 7 of the line output BAS216 transformer feeds the CRT heaters. This pin is also 3.3V R3549 in power supply connected to rectifier diode D6447 which feeds two pnp transistors, Tr7441 and Tr7443. Tr7441 is for black current monitoring and protection. Should the rectified heater supply fall, Tr7441 switches on. The R3449922*' R3256 1k C2460 100p R3491 10k/ 27k' R3493 3.9/6.8'0 fusible (4 Tr7461 BC337-25 5.5V C2455 47 'value depends on type of CRT black -current line then rises above the limits expected by the running software. After a pause the set reverts to standby. Tr7443 is included to detect a rise in the D6462 6.8V Tr7463 BC327-25 rectified heater supply. In this event it conducts and the EHTO line voltage rises sharply. This is Drive from R3251 UOC pin 30 100 L5242 I detected at pin 34 of the UOC as R3468 330 mil C2405 1n T5461 Base of Tr7460 R3463 33 a sharp rise in the EHT and again the set reverts to standby. Tr7462 PDTC143ZT An added complexity is that MT, the field guard waveform is connected to the black -current line (Tr7441's collector) so that the running software can monitor Fig. 3: The line drive circuitry. this as well as the black current. With this chassis too little or too much beam current will initiate protection, so be very careful when setting the Al control on the line output transformer. Fault codes To help with fault finding the set's soft- sound muting is deactivated, along with child locks, parental controls and timer on/off settings. default service mode is to short together two internal service links, 9641 and 9631 (see Fig. 4), before switching on. If this ware produces and stores in memory fault - To cancel the customer service display method is used, check the LT lines quickly code information, see Table 1. simply press any key. as the 8V line protection is overridden. If a Customer service mode Default service mode faulty EEPROM is suspected, the service links can be used to check whether the A customer service mode is included in If a set is faulty, getting an error code dis- UOC works when the EEPROM has been the software to help with fault diagnosis played could be impossible without remov- removed. But the raster will be small, on outside calls. To activate this, press and ing certain connections to the UOC. This is noisy and distorted. hold the remote -control unit's mute key not easy with a surface -mounted compo- and at the same time press and hold any nent. To overcome the problem a default Service alignment mode local key for four seconds. It's easiest to use the set's volume -down key. This produces on screen a read-only display that shows the software version, fault codes, software options, tuning standards and the user -control settings. In addition any service mode is available using a remote control unit key sequence: 062596 and menu. If it's not possible to produce an onscreen display the red LED will blink sequentially to indicate the fault code. A more drastic method of entering the To enter the main service alignment mode, use the remote -control unit key sequence 062596 followed by screen info. This gives direct access to the model options, geometry settings, grey -scale settings etc. The software options can be checked with Table 1: Fault codes for the LO1 chassis a list of codes on a white label that's usually on the back of the CRT. Code Fault condition After carrying out a repair, don't forget to clear the error code buffer from this service mode. 0 No fault To exit the service alignment mode, 1 X-ray protection (USA only) switch the set to standby - simply switch- 2 Line timebase protection/high beam current ing it off will bring it back on in the serv- 3 Field protection/missing or distorted field guard waveform ice alignment mode. 4 Multi -sound processor not responding to the data bus 5 Power -off reset/3.3V or 8V supply failure Known faults 6 Clock or data bus line problem Transistor Tr7441 (BC857B) in the line 7 Excess 12V supply current output stage protection circuitry can be the 8 EW protection activated cause of several different faults depending 9 EEPROM not responding to the data bus on whether it's leaky or short-circuit. The 10 Tuner not responding to the data bus set may lapse into standby after briefly 11 Black -current loop outside specification showing a coloured or bright raster. It may 12 PIP generator not responding to data bus (not Europe) show a black raster then go off. Sometimes the set just stays in standby but March 2004 TELEVISION 275 9661 9662 9615 9616 .7 9623 9616 - 9620 Fig. 4: Short these service links to enter the default service mode. the LED flashes eleven times repeatedly. The 3.3V regulator IC7560 (L78L33) can fail. If it goes short-circuit, the UOC will almost certainly fail as well. Make sure that you double check the UOC part number for the set, as a number of different versions are used in the L01.1/L01.2 range. The line output transformer T5445 can fail. The power supply then goes into the current -limiting mode. The tuner can fail, but always check that the option byte data is correct before you condemn it, as the on -board software enables several different tuners to be used. Low gain can simply mean that the wrong tuner type has been selected. This is not really a fault: if the local keypad doesn't work, someone has activated the child -lock mode. To release, use the remote -control unit and the user menus. OLOUR TRADE r, 0 LA RG Tr-rr uv r.St T nap r v -r rz,s, Wholesaler d s utors & Expert Agents of Domestic Electronics & Appliances FULL RANGE OF FACTORY GRADED TV's DVD / VIDEOS HI-FI SMALL & LARGE DOMESTIC GOODS MAIN DEALER hompson 0 www.colourtrade.com WHOLESALE MADE NE, SIGN UP NOW FOR OUR WHOLESALE PRICES. ALL ORDERS TV's, DDINVSPoDAw'sTC,AHVvEaCDilRaObN&leTAHUEDSAIOME DAY. Over 40 years of genuine experience Experts on: - Thomson Sanyo Beko LG Tatung Ferguson Bush Funai Pacific Dansai Samsung & more 0T9EC0H7NI0CA7L6SU7PP0OR8T0 Call cost 60p min Am -.1 Tel: 0121 359 7020 Fax: 0121 359 6344 Phoenix House, 190 Bridge St. West, Newtown, Birmingham B19 2YT Email: [email protected] 276 March 2004 TELEVISION Introduction to computer networking In Part 3 of his current series Fawzi Ibrahim* describes the action of routers in local -area and wide -area networks As mentioned in the previous instalments in this series, communication between hosts (PCs, workstations) on different networks requires a router to direct messages from one network to another. A router may be a dedicated computer or it may be a PC, for example a Windows 2000 server, configured for routeing messages between networks. A router has two or more network interface cards, usually known simply as interfaces, see Fig. 1. Each interface (IF) is connected to a network that has a different network address. Routeing information, in the form of network addresses, their subnet masks and the route to the network, is held in a routeing table. In Fig. 1 interface IF! is connected to network 195.123.10.0/24 (subnet mask 255.255.255.0) while interface IF2 is connected to network 130.55.0.1 (subnet mask 255.255.0.0). By default, the router will know of the existence of the two networks and will enter them in its routeing table, as shown in Table 1. The first entry in the table states that for network 130.55.0.0, subnet mask 255.255.0.0, the router (normally know as the gateway) has an IP address of 130.55.0.1, i.e. IF2. The second entry states that for network 195.123.10.0, subnet mask 255.255.255.0, the gateway has an address of 195.123.10.1, i.e. IF1. Thus messages, in the form of frames, arriving at IF1 destined for network 130.55.0.0 are directed to IF2; conversely messages arriving at IF2 destined for network 195.123.10.0 are directed to IF1. Routers can direct messages to their various interfaces only when the destination network address is listed in the routeing table. If not, a message to the effect that the network is 'unreachable' will be sent back to the source address. Default gateway When you configure the TCP/IP of a host PC you are, in addition to setting the IP address and the subnet mask, invited to enter the IP address of a gateway. This is the IP address of a router to which messages destined for hosts on remote networks will be directed. It's known as the default gateway. For host PC1 in the network shown in Fig. 2 the default gateway is the router interface that's connected to it, namely 100.0.0.1. For PC3 the default gateway is 200.0.0.1. For PC2 there are two possible gateways, 150.0.0.1 and 150.0.0.3. In the routeing table the default gateway is entered as network 0.0.0.0, subnet 0.0.0.0, i.e. any network with any subnet mask. For example the routeing table for PC I would, at the top, have the following entries for the default gateway: 0.0.0.0 0.0.0.0 100.0.0.1 100.0.0.2 The first two entries indicate any network, the third the gateway IP address and the fourth the PC's own IP address. A typical routeing table, showing all default entries, is shown in Fig. 3. Table 2 explains the meaning of each field and each entry. Routers function at the network layer of the 7 -layer model. When a frame arrives, the router de -encapsulates it up to the network layer. It then checks the network layer packet's header to retrieve the destination IP address and its subnet mask, from which the network address is obtained. The router will then look up the network address in its routeing table. If the address is listed, the router adds its own header and re -encapsulates the packet, which is sent to the data link layer where it is encapsulated and sent to the physical layer for final encapsulation into a frame. Where more than one router is involved, as is usually the case with a WAN (wide area network), entries for remote networks must be made in the routeing tables. These entries may be static or dynamic. Fig. 1: A router with two interfaces connected to two networks. *Fawzi Ibrahim is senior lecturer at the College of North West London and is the author of several books, including PC Operation and Repair. March 2004 TELEVISION 277 Address of default gateway Local loopback Local subnet address Network card address - Subnet broadcast address - Multicast broadcast address Internet broadcast address - Ma.4-4111 icrosoft Windows 2000 [Uersion 5.00.21951 (C) Copyright 1985-2000 Microsoft Corp. H :\>ronte print Interface List :x1 MS TCP Loophack interface :x1000003 _MO 10 dc d9 2c h4 Intel<R> PRO Adapter .ctive Routes: ,t,mrk Destination Netnask 0.0.0.0 .127.0.0.0 255.0.0.0 .200.200.200M 255.255.255.0 .200.200.200.1 255.255.255.255 .200.200.200.255 255.255.255.255 -.224.0.0.0 224.0.0.0 255.255.255.255 255.255.255.255 iefault Gateway: 200.200.200.245 Per tent finutes: None Gateway 200.200.200.245 127.0.0.1 200.200.200.1 127.0.0.1 200.200.200.1 200.200.200.1 200.200.200.1 Interface 200.200.200.1 127.0.0.1 200.200.200.1 127.0.0.1 200.200.200.1 200.200.200.1 200.200.200.1 Metric 1 \ 1 1 1 1 1- 1 100 0 0 1 100.0.0.2 60016, 1%100.3 15.002 Rader 02 200.0.0.1 1so.o.o. -200002 NET1 100 0 0 0/8 NET2 150 0 0 0/113 NET3 200.0.00124 Fig. 2: Computer network with two routers, R1 and R2 Consider the network shown in Fig. 2. In this case router R1 has knowledge of NET1 and NET2 but not NET3. Its routeing table will contain entries for network 100.0.0.0, subnet mask 255.0.0.0, and network 150.0.0.0, subnet mask 255.255.0.0. Thus frames from hosts on NET1 destined for NET3 would not be delivered. Similarly, router R2 has knowledge of network 150.0.0.0, subnet mask 255.255.0.0, and network 200.0.0.0, subnet mask 255.255.255.0, but no knowledge of NET1. Frames from hosts on NET3 destined for NET1 will thus not be delivered. Full communication There are two ways of overcoming this limitation to allow full communication between all the hosts involved. The first is to set a default gateway for each router, namely 150.0.0.1 for router R1 and 150.0.0.3 for router R2. The second is to add an additional entry in each router's routeing table. While the first method rectifies the problem, what is called `looping' between the two routers may occur, creating unnecessary traffic in the network. Looping occurs when a host, say PC 1, attempts to send a message to a remote host on a network other than NET 1, NET2 or NET3. The message will be sent to router R I. As it is for a remote network R I will send it to the next gateway, router R2. This router receives it, notes that it is for a remote network, and sends it to gateway RI. RI sends it back to R2, and so on. This will be terminated after a period of time known as Table 1: Routeing table for R1, Fig. 1 TTL (Time To Live). For this reason, routers are not configured with a default gateway. The recommended method is to add a static route for NET3 in router RI and a static route for NET1 in router R2. These entries may be made statically, i.e. manually, or dynamically, i.e. automatically. Static entry involves carrying out a route -add command at the relevant router. In this case at router RI add a route for NET1 from the command line prompt as follows: ROUTE ADD 200.0.0.0 MASK 255.255.255.0 150.0.0.1 (150.0.0.1 is the gateway IP address, i.e. the interface to which frames destined for NET3 should be directed.) At router R2 add a route for NET3 from the command line prompt as follows: ROUTE ADD 100.0.0.0 MASK 255.0.0.0 150.0.03 (150.0.0.3 is the gateway IP address, i.e. the interface to which frames destined for NET! should be directed.) Static entries are stored in the computer's system memory and will thus be lost if the router is rebooted. To avoid this, a permanent route entry can be made using switch -p (p for persistent) with the command, i.e. ROUTE ADD -P. With Windows 2000 a static route entry can be added using the more convenient Routeing and Remote Access utility. This method of adding static routes suffers from the disadvantage that it doesn't identify faults in the entry, compared with the command -line entry that refuses to add an entry if an incorrect mask or interface is included. DHCP default gateway configuration The Options utility of a DHCP server can be used for default gateway configuration. A DHCP server has a number of settings listed under two sets of options: scope options, which apply to all workstations in that particular scope; and server options, which apply to all workstations regardless of the scope where there are two or more DHCP scopes. To set the gateway of a DHCP host, set the Router option number 06 to the IP address of the appropriate router interface. Network Netmask Gateway Interface 130.55.0.0 255.255.0.0 130.55.0.1 130.55.0.1 195.123.10.0 255.255.255.0 195.123.10.1 195.123.10.1 Next Month In Part 4 next month we will deal with DNS (Domain Numbering Service), which enables host computers belonging to on company/organisation but located at a number of cities, countries or continents to be grouped together into a single -name domain known as an FQDN (Fully Qualified Domain Name). 278 March 2004 TELEVISION Table 2: Routeing table field and entry meanings Routeing table field Function Network address For network address identification. Can be the address of a host, subnet, network or the default gateway. Netmask Determines how much of a packet's destination address must match the network address in the routeing table before the route can be used to deliver the packet. Gateway address Identifies where a packet has to be sent. Can be either a PC's IP address or the default gateway address. Interface Identifies, depending on the routeing entry, either a PC's IP address or the loopback address (127.0.0.1). Metric Entry Identifies the number of hops between a PC and the destination network address. The local network is always one hop. Each router thereafter adds another hop. A PC uses the hop count to determine the fastest route for a packet. Description 0.0.0.0 This entry identifies the address of the default gateway. IP uses this address to route a packet in the event that the routeing table doesn't contain a route to the packet's destination network address. The value for the network address is 0.0.0.0; the subnet mask is also 0.0.0.0; the gateway address is your default gateway address; and the interface is your IP address. You will not see this entry unless you have configured a default gateway address for your computer. Local loopback 127.0.0.0 This entry provides the route for testing the IP configuration of your computer, using the address 127.0.0.1. The network address is 127.0.0.0; the subnet mask is 255.0.0.0; the gateway address is 127.0.0.1; and the interface is 127.0.0.1. Local subnet address For example 200.200.200.0. This entry identifies the route to the local network. The network address is the local subnet address (using the classroom network, 200.200.200.0); the netmask is the subnet mask you are using (255.255.255.0 in the classroom); the gateway and interface addresses are your IP address (200.200.200.# in the classroom). Network card address For example 200.200.200.12. This entry identifies the route to your IP address. The network address is your IP address; the subnet mask is always 255.255.255.255; the gateway and interfaces are 127.0.0.1. Because the gateway and interface addresses are the same, if you send a packet with the destination address set to your IP address the packet will stay in your computer and not be transmitted on the network. Subnet broadcast address For example 200.200.200.255. This entry identifies the route for broadcasts on your local TCP/IP network. The network address is the portion of your IP address according to its class (A, B or C), and host addresses are set to all 255s. For example, with a class C classroom network address the subnet broadcast address is 200.200.200.255; the netmask for this routeing entry is 255.255.255.255; and the gateway and interface addresses are your IP address. Multicast broadcast address 224.0.0.0 This entry defines the route for sending multicasts, enabling you to send messages to multiple hosts simultaneously. The network address is 224.0.0.0; the netmask is 224.0.0.0; the gateway and interface addresses are your IP address. Internetwork broadcast address 255.255.255.255 This entry identifies the route for sending broadcasts to the entire TCP/IP network, including all network addresses. The network address and netmask are both 255.255.255.255; the gateway and interface addresses are your IP address March 2004 TELEVISION 279 Service Casebook Michael Maurice One of the problems you get when running a servicing business is sets that fail again soon after repair, often exhibiting the same symptoms but with a totally different cause. Here are six examples I've had recently. Philips 29PT6973 The original fault had been the dead -set symptom because the on/off switch had burnt out. Less than two months later I was called back because the set was again dead. This time the cause was one of the 220nF disc capacitors in the power supply. The customer understood the situation and paid, but was clearly not happy. Grundig M70-2701 Again the original fault had been a dead set. Repair of the power supply had involved replacement of the 681S2 and 270k52 resistors along with the IRFPC50 chopper FET and the TDA4605-3 chopper control chip. Within a month it had failed again, the symptom this time being a bright white screen. The green video output IC was short-circuit, and as a result the 100 resistor in the 200V supply had gone open circuit. Panasonic TX25MD1 (Euro-2L chassis) Tuner drift had been the original fault with this set. It had been easily solved in the customer's home by replacing the tuner. Within three weeks I was called back when the degaussing posistor failed, blowing the mains fuse. Philips K40 chassis The original fault with this elderly set had been intermittent loss of the picture, the cause as usual being dry -joints around the line output transformer. Within five weeks the set was back, this time dead with just a flash from the standby light. I found that the line output transistor was short-circuit. When I fitted a replacement the set came on with a horrible squealing sound and a smell of burning. The line output transformer had also failed. The customer agreed to the repair because it was cheaper than a new set - and the picture is incredibly good. Panasonic TX25MS1 (Euro-2L chassis) When this set was first switched on there was a bright raster with flyback lines, also an EW fault. The sound was OK until the set tripped. If you tried a few times the fault would go away. The first thing I did was to resolder a number of suspect joints in the line output stage, and fit new capacitors in some places where the local cowboy had fitted unsuitable ones. As the set then behaved itself, I returned it to the customer. Two weeks later the set was back again, this time with a short-circuit line output transistor. I fitted a replacement, then looked for a possible cause of the original transistor's failure. While doing this I found that several pins of the. VDU IC were dry jointed. Resoldering them seemed to cure the fault. Had they been the cause? Probably, as the set hasn't been back. Sharp 66CS03H I was originally called to this set because it took a long time to come on. Replacement of the usual crop of capacitors in the power supply cured that problem. But a few weeks later I was called back because there was no sound. R643 was open -circuit. Panasonic NVHD675 This relatively new VCR didn't respond to remote -control commands. The cause was obvious once it had been stripped down: the infra -red remote sensor was dry -jointed. JVC AV25F1EK (JX chassis) The customer said that the picture had taken longer and longer to appear. There was now a very dim picture, as though the CRT had failed. A check with my CRT tester proved that this wasn't the case however. After some thought I decided to replace the TDA4580 RGB video controller chip IC351. Much to my relief, this cured the fault. Orion 32F44 Field collapse was the fault with this widescreen set. It wasn't easy trying to find the faulty parts in a badly -lit room, but this made more sense than taking the monster down three flights of stairs. I had to replace the TDA8350Q chip ICF1, also RF8, RF9, RF10 and RF16. Goodmans 1760SW I don't normally service Goodmans audio systems, but the owner was adamant that she wanted this one repaired. The problem was that after about thirty seconds the light on the CD player would flicker and it would turn itself off, saying "no disc". After dismantling the system, which is a nightmare, I found the 8V regulator that powers the CD section. It consists basically of a couple of transistors and a 9-1V zener diode. A replacement zener diode and series power transistor restored the supply and got the CD player going again. I was concerned that the transistor ran very hot, because its heatsink was woefully inadequate, but a soak test over several days confirmed that it was working satisfactorily. 280 March 2004 TELEVISION distributor of electronic components Television Repair / Mod Kits 6 BDC)16 TYPI 6002 1452T 1427T 1402 1455T 1456T 1458T 14591 1499Y 14SLTX 1799Y 2002 2009B 20521 2152T 2099TX BTV17 CTV501 CTV701 CTV840 CTV841 CTV485 CT1417 CT2159U CT2162UNT CT2863UNT GAICU PSU PSU PSU PSU PSU PSU PSU STANDBY STANDBY STANDBY PSU PSU PSU PSU STANDBY STANDBY PSU PSU PSU PSU PSU taffn0 PSU PSU PSU PSU ONWAKIT ONWAKIT ONWAKIT ONWAKIT ONWAKIT ONWAKIT ONWAKIT MODKIT37 MODKIT37 MODKIT37 ONWAKIT ONWAKIT ONWAKIT ONWAKIT MODKIT37 MODKIT37 ONWAKIT ONWAKIT ONWAKIT ONWAKIT ONWAKIT ONWAKIT ONWAKIT ONWAKIT ONWAKIT DI'Ctnicir,Z=AVV!)0(0 F SERIES PSU MODKIT30 TVC563 STANDBY MODKIT37 GOCADtVn2 CF25A5OF FRAME MODKIT36 CF25C22C FRAME MODKIT35 CF28A5OF FRAME MODKIT36 CF28C22F FRAME MODKIT35 CF28C28F FRAME MODKIT36 CF29C42F FRAME MODKIT35 tOCOACIGTD 147TT PSU ONWAKIT 149T PSU ONWAKIT 1430RA PSU ONWAKIT 1430RS PSU ONWAKIT 1430RW PSU ONWAKIT 1450T PSU ONWAKIT 1455TS PSU ONWAKIT 2019R PSU ONWAKIT 2029T PSU ONWAKIT 2029TA PSU ONWAKIT COMPACT 11 PSU MODKIT47 F16 CHASSIS FRAME GOODKITI F16 CHASSIS LINE GOODKIT1 LW4ILAIL3 3 29@Cal OVIEJL3 @DODIWZMA.coouulthano3 F16 PSU GOODKIT1 F16 VIDEO GOODKIT1 CUC 2050 CUC 2051 CUC 2058 CUC 2059 CUC 2080 CUC 7350 CUC 7301/3 (BUZ90) CUC 7301/3 (MJF18004) a2VINDUCO PSU MODKIT48 PSU MODKIT48 PSU MODKIT48 PSU MODKIT48 PSU MODKIT48 GRUNDIGKIT1 PSU GRUNDIGKIT2 PSU GRUNDIGKIT3 HIT14RC DRUM PSU ONWAKIT AV29SX1EK AV29SX1EN AV29SX1EN1 AV29SX1PF AV29TSIE1 C14E1EK C14T1EK C21ET1EK CS21M3EK JVit FIELD 0/P FIELD 0/P FIELD 0/P FIELD 0/P FIELD 0/P PSU PSU PSU PSU JVCKIT1 JVCKIT1 JVCKIT1 JVCKIT1 JVCKIT1 ONWAKIT ONWAKIT ONWAKIT ONWAKIT KWYt290 1455 PSU ONWAKIT 1496R/T(H3N90) PSU MODKIT43 1496R/T (BUZ90) PSU MODKIT44 1498 PSU ONWAKIT 2086 PSU ONWAKIT 2096R/T (H3N90) PSU MODKIT43 2096R/T (BUZ90) PSU MODKIT44 2098 PSU ONWAKIT 21VIN (BUZ90) PSU GRUNDIGKIT2 21V1T(MJF18004) PSU GRUNDIGKIT3 TVR180R/208 STANDBY MODKIT37 TVR185T STANDBY MODKIT39 N0VIDV130t00 AV1 SERIES PSU MITSKIT3 CT1M5B PSU MITSKIT3 CT21M5BT PSU MITSKIT3 CT25M5BT PSU MITSKIT3 CT21A2STX TDA 8178S MITSKIT1 CT21AX1B PSU MITSKIT3 CT21A3STX TDA 8178S MITSKIT1 CT21AV1BS PSU MITSKIT3 CT25A2STX TDA 8178S MITSKITI CT25A3STX TDA 8178S MITSKIT1 171147 FAVIDIR A HICIANI ',40,119Z01. Vit R3StOglaBOCI0610026CV CT25A4STX TDA 8178S MITSKIT1 CT25A6STX TDA 8178S MITSKIT1 CT25AV1B PSU MITSKIT3 CT25AV1BS PSU MITSKIT3 CT25AV1BD PSU MITSKIT3 CT25AV1BDS PSU MITSKIT3 CT28AV1B PSU MITSKIT3 CT28AX1BD PSU MITSKIT3 CT28AV1BDS PSU MITSKIT3 CT29AS1 TDA 8178S MITSKIT2 CT29A4 TDA 8178S MITSKIT2 CT29A6 TDA 8178S MITSKIT2 CT29B2 TDA 8178S MITSKIT2 CT29B3 TDA 8178S MITSKIT2 CT29B6 TDA 8178S MITSKIT2 CT33B3 TDA 8178S MITSKIT2 M5 SERIES PSU MITSKIT3 GIOIDUZZGAS CE25 CHASSIS PSU NIKKAIKIT1 C289FTXN PSU NIKKAIKIT1 C28F41FXN PSU NIKKAIKIT1 PGINZIDDAlt 10561 TDA 8175 PANKIT1 TX25XD60 VERT OUTPUT PANKIT2 TC28XD60 VERT OUTPUT PANKIT2 TX28XD70 VERT OUTPUT PANKIT2 TX29XD70 VERT OUTPUT PANKIT2 TX-W26D3 VERT OUTPUT PANKIT2 ?OM UPt 310.10708 310.20491 310.20496 310.31994 310.32252 310.32253 310.32254 310.32255 310.32262 310.62264 ANUBIS A SOPS CP110 CHASSIS SOPS G90A CHASSIS SOPS G9013 CHASSIS SOPS G110 CHASSIS SOPS GR2.1 CHASSIS SOPS GR2.2 CHASSIS SOPS D-16 CHASSIS SOPS HSM VIDEO SOPS JSM VIDEO SOPS KSM VIDEO SOPS LSM VIDEO SOPS PHILKIT3 PHILKIT2 PHILKIT10 PHILKIT6 PHILKIT5 PHILKIT4 PHILKIT9 PHILKIT7 PHILKIT8 PHILKIT1 PHILKIT2 PHILKIT8 PHILKIT10 PHILKIT10 PHILKIT3 PHILKIT1 PHILKIT1 PHILKIT6 PHILKIT5 PHILKIT4 PHILKIT9 PHILKIT7 WIRT WI P2 A ZOCZ22, (51cl' LEI L3 CI5944 CI6844 VIK310 VIK320 VIK350 VI375 VI395 WINNER 1 tnEdItUtit FRAME SAMKIT2 FRAME SAMKIT2 PSU SAMSUNGKIT PSU SAMSUNGKIT PSU SAMSUNGKIT PSU SAMSUNGKIT PSU SAMSUNGKIT PSU SAMSUNGKIT tOZ:122 51CSO3H PSU SHARPKITI 51CSO5H PSU SHARPKITI 56FW53H PSU & DOLBY ....MODKIT45 59CS03H PSU SHARPKIT2 59CS05H PSU SHARPKIT2 59CSD8H PSU SHARPKIT2 59DS03H PSU SHARPKIT3 59FW53H PSU & EW MODKIT49 66CS03H PSU SHARPKIT2 66CS05H PSU SHARPKIT2 66CSD8H PSU SHARPKIT2 66FW53H PSU & DOLBY ..MODKIT45 66FW53H PSU & EW MODKIT49 66FW54H PSU & DOLBY ...MODKIT45 66FW54H PSU & EW MODKIT49 76FW53H PSU & DOLBY ....MODKIT45 76FW53H PSU & EW MODKIT49 76FW54H PSU & DOLBY ....MODKIT45 76FW54H PSU & EW MODKIT49 DA -100 CHASSIS ....PSU & EW MODKIT49 SLV715HB SLV777UB ,D0117 VCR - PSU VCR - PSU MODKIT40 MODKIT40 YggCadt 35029400 35065920 FV70 PSU ICC7 CHASSIS TDA 8178FS ICC7 CHASSIS FRAME ICC8 CHASSIS TDA 8178FS ICC8 CHASSIS FRAME ICC9 CHASSIS EAST/WEST ICC17 CHASSIS PSU ISS20 (TV-DVD) PSU R3000 PSU R4000 PSU TX92F CHASSIS EAST/VVEST THOMKIT2 THORNKIT1 THORNKIT1 THOMKIT1 THOMKIT3 THOMKIT1 THOMKIT3 THOMKIT4 MODKIT41 MODKIT46 THOMKIT2 THOMKIT2 THOMKIT4 C130gt2 600 04 GOODKITI GRUNDIGKIT1 GRUNDIGKIT2 GRUNDIGKIT3 JVCKIT1 MITSKITI MITSKIT2 MITSKIT3 MODKIT30 G -,L2062 ai2C)12 60C) £ 11.00 £ 10.50 £ 10.50 £ 10.50 £ 11.00 £ 3.00 £ 15.00 £ 6.00 £ 10.00 MODKIT35 MODKIT36 MODKIT37 MODKIT39 MODKIT40 MODKIT41 MODKIT43 MODKIT44 MODKIT45 PG3062 027).ff,772 £ 9.50 £ 5.00 £ 6.50 £ 8.50 £ 6.00 £ 6.00 £ 7.00 £ 7.00 £ 4.00 MODKIT46 MODKIT47 MODKIT48 MODKIT49 NIKKAIKIT1 ONWAKIT PANKIT1 PANKIT2 PHILKIT1 bADAY1 6002 £ 12.00 £ 15.50 £ 8.00 £ 13.00 £ 12.00 £ 12.00 £ 15.00 £ 9.00 £ 10.00 PHILKIT2 PHILKIT3 PHILKIT4 PHILKIT5 PHILKIT6 PHILKIT7 PHILKIT8 PHILKIT9 PHILKIT10 POlcog 02CO22 61002 £ 2.50 £ 4.00 £ 4.25 £ 5.75 £ 5.50 £ 7.60 £ 4.25 £ 7.50 £ 8.50 SAMKIT2 SAMSUNGKIT SHARPKITI SHARPKIT2 SHARPKIT3 THOMKIT1 THOMKIT2 THOMKIT3 THOMKIT4 P121162 £ 8.00 £ 16.00 £ 11.00 £ 11.00 £ 9.00 £ 7.00 £ 12.00 £ 9.00 £ 4.00 OG.227 .1ovlYti0 Philips L01.1E Chassis PSU Repair Kit Yy y J 11 Vestel 11AK31 Chassis PSU Repair Kit Fits the following models : 28PT4457/05 , 28PW5407/05 , 28PW6006/05 Fits the following brands : Bush , Goodman , Hitachi , Toshiba Models BD2851S , BD2951S , BD2581S, BD3251S Order Code : MODKIT50 Price : £ 18.00 + vat Order Code : MODKIT51 Price : £ 10.00 + vat Pop ©Thme. cia 3 Ce t 9, aolfavidy 14h Mt) EACM =c) ICA) b , ddl4tax IrIAD 0 ERE distributor of el9ctrpnic Digital Satellite Accessories &JarymatMffig L2c;rEacAca TY Idol' ,ylca itcxkollaleAloca ,DasynualcAleag GIG,cocAc itC)0176,0 &,[* "°DBGDJfft)J 2ofiDaik® tam tcwfflalatAtIoti) 4Q4 Order Code : SKYPACKI Price : £ 16.00 + vat each 5+ £ 14.50 + vat each Carriage Charged at £ 5.00 + vat Allows control of SkyTM Digibox via the signal feed for second TV Order Code 27833R 4111ralv £ 5.80 + vat each 10 or more 4.80 + vat each Order Code : RCSKY Price £ 7.95 + vat 5 or more £ 7.45 + vat each 10 + E 6.95 + vat each Carriage Charged at £ 5.00 + vat alsy21 QV 13w(11 *ic;) Order Code : TVLINKEYE Satellite Repair / Mod Kits Order Code : SKYPACK2 Price £ 13.00 + vat each 5 + £ 11.50 + vat each Carriage Charged at 5.00 + vat y' tlzs Glckap LP aJ For use with aerial amplifiers and SkyTM Digibox Allows for operation of Link Eye in conjunction with a distribution amplifier Order Code 27829R Price: £ 5.00 + vat GAInlYfficl D22VDD Tuner Repair Kit Order Code SATKIT35 Price E 1.40 + vat Z;;Acwica' DMVDD PSU Reliabilty Kit Order Code SATKIT36 Price E 12.00 + vat D2SIVOD PSU Repair Kit Order Code SATKIT37 Price E 13.50 + vat COGW,DC130 ItOtICA9 Digital Satellite Receiver Repair Kit Early psu MODEL DSO - 0385 REV C Order Code SATKIT34A Price : £ 10.00 + vat rt2ism-Ildg 1COD0 0 (0Dt01) Digital Satellite Receiver Repair Kit LATER psu TYPE REV 03 DSO - 0375 REV A DSO - 0385 REV 5 Order Code SATKIT3413 Price : £ 10.00 + vat Suitable for Amstrad DRX100 , DRX200 Grundig GDR200 , GDS200 Pace Digibox plus many more analogue makes and models Order Code : FANKITI Price £ 10.00 + vat Pli_r_igal@ ttAc;11,1 la@c4e7®1? IP!tatia an Suitable for Panasonic TU-DSB20/30 , TU-DSB31/35 Order Code : FANKIT2 Price : £ 15.00 + vat Ityalyx:IID ntil ,,,tAc4114q.G. ,G.i@c4lyGiceliT2e411,t0101qi GM' These kits contain capactiors that are generally of higher specification than those fiited by the manufacturers. CODOCI) Early PSU DS00385 Rev C Kit Contains 9 capactitors Code :RELKIT34A Price: £ 4.00 + vat @CAJOC) I @Dt,D09 Later PSU DS00375 Rev A DS00385 Rev F Kit Contains 11 capactitors Code :RELKIT348 Price: 4.00 + vat COLA, 00 0 CODttD0 Later PSU Rev 03 Kit Contains 13 capactitors Code :RELKIT34C Price: 4.00 + vat @Dt300 0 CODt,DOC) Samsung PSU PSSH370601B Kit Contains 12 capactitors It1=AtC0 Samsung PSU PSSH370603B Kit Contains 13 capactitors Code :RELKIT34D Price: 4.00 + vat Code :RELKIT34E Price: 4.00 + vat nda a Ltd cfistni*utor of electronic components 105°c Electrolytic Capacitors Va6191A tCDDA P pia PA ,1 vaaloa c3atm PfralltA 5)2(2 W/i111.581I reCi5A) PROWS [Ta waNdlogi qtzom PMEall PRIM PAWS acgcK twa n nnra ah MN IR pLi. n ara LE. ra irn Pactrz Alt Waft 220uF .CAP163. .£0.70 470uF .CAP164 ...£0.80 90 Wes 100uF .CAP118...£0.45 220uF . .CAP165. .£1.00 470uF ..CAP29 .£1.20 680uF . .CAP166. .£1.20 1000uF .CAP119. .£1.50 2200uF CAP120....£2.10 3300uF CAP167. £1.60 MAIO 22uF CAP121...10.35 33uF CAP122. .£0.35 47uF CAP123. .£0.35 100uF CAP124. .£0.60 150uF CAP168. .£0.65 220uF CAP 125....£0.80 330uF .CAP30 ...11.75 470uF .CAP31 11.75 680uF .CAP32 _12.10 1000uF .CAP33 .£2.10 1200uF CAP169 .£1.50 1500uF CAP170 .£1.50 2200uF ..CAP34 15.25 3300uF ..CAP35 15.00 4700uF .CAP36 .£6.10 6800uF CAP171 .£4.50 MOON 10uF CAP37 10.45 15uF CAP172 .£0.45 22uF CAP38 10.45 33uF CAP126 .£0.40 47uF CAP39 10.48 68uF CAP127....£0.55 100uF .CAP40 10.70 120uF CAP128 .£0.85 150uF .CAP41 £0.95 220uF .CAP42 11.20 330uF .CAP43 .£1.40 470uF ....CAP44 11.90 680uF .CAP45 £3.15 II47 Valft...coorDahaviKe 00 Vont.w.40ajaloAcuixe 914 VVItta,..aocollannecd Witio...egoma0maisq7 10 1000uF ..CAP46 ...13.65 10 100uF . CAP66 ...10.85 10 2 2uF CAP94 ...10.50 5 33uF CAP206. .£1.75 5 10 1500uF ..CAP47 . .£3.90 5 220uF ....CAP67 ....£1.75 10 3.3uF CAP95 .£0.50 5 47uF CAP106....£4.35 10 2200uF ..CAP48 12.00 2 330uF . CAP68 ...12.45 10 4.7uF CAP96 . 10.50 5 100uF CAP154. .£4.50 5 3300uF ..CAP49 ...12.20 2 470uF CAP69 . .£4.35 10 6.8uF CAP187. .£0.80 101 220uF CAP155. .£2.00 2 10 4700uF ..CAP50 _13.65 2 680uF CAP70 _14.90 5 10uF CAP97 .£0.95 101 330uF CAP206....£2.50 1 10 6800uF ..CAP51 13.90 2 1000uF ..CAP71 ...15.25 10 22uF CAP98 11.05 10 10 1500uF ..CAP 143....£4.50 5 33uF CAP99 . 11.55 5 43450 Yana 10 RAN, 2200uF ..CAP72 ...13.25 2 47uF CAP100....£1.75 10 1uF CAP156....£0.70 10 10 1uF CAP130. .£0.40 10 3300uF CAP144. .£3.25 2 68uF CAP188. .£1.30 5 2.2uF CAP207 .£1.20 10 10 3.3uF CAP131. .£0.40 10 100uF. .CAP101 12.10 10 3.3uF CAP157 .£1.50 10 5 4.7uF CAP132....£0.45 10 St WW1 220uF .CAP 102. .£6.00 5 4.7uF CAP208 .£1.10 5 10uF CAP52 . 10.50 10 0.22uF.. CAP145....£0.45 10 330uF. .CAP189....£3.00 2 10uF CAP158....£2.25 10 22uF CAP53 10.45 10 0.33uF CAP178. .£0.35 10 470uF .CAP103 .£6.00 5 22uF CAP159 .£3.40 10 10 33uF CAP54 . 10.50 5 0.47uF . .CAP73 ...10.35 10 680uF. .CAP190 .£3.00 2 33uF CAP209 .£2.60 5 10 47uF CAP55 . 10.85 10 luF CAP74 ....£0.35 10 1000uF .CAP191 .£3.00 1 47uF CAP210 .£1.50 21 10 68uF CAP133. .£0.55 10 1.5uF CAP 179....£0.35 10 100uF .CAP211 .£3.00 2 10 100uF . .CAP56 ...10.85 10 2.2uF CAP75 ...10.35 10 9t0 Ycii40 330uF CAP212 .£5.00 1 5 150uF . .CAP57 ...10.95 10 220uF ....CAP58 _11.45 5 3.3uF CAP76 ...10.50 10 0.47uF. .CAP 192 10.45 10 5 4.7uF CAP77 ...10.35 10 1uF CAP193....£0.45 10 400 RAU 10 330uF CAP134. .£1.60 10 6.8uF CAP180. .£0.50 10 22uF CAP146 .£0.45 10 0.47uF .CAP213....£0.60 10 10 470uF CAP135. 11.75 10 10uF CAP78 ...10.50 10 3 3uF CAP194 .£1.00 10 1uF CAP107....£2.15 5 5 680uF . CAP59 ...16.50 10 15uF CAP79 . 10.95 5 4 7uF CAP195 .£1.00 10 2.2uF .CAP108 .£2.25 5 10 1000uF ..CAP60 . 14.35 10 22uF CAP80 ...10.75 10 10uF CAP147 .£1.40 10 3.3uF CAP214 .£2.25 5 5 1500uF CAP173 .£4.00 5 33uF CAP81 ...10.85 10 22uF CAP148 .£1.80 10 4.7uF .CAP109 £3.15 5 5 2200uF ..CAP61 12.45 2 47uF CAP82 10.95 10 33uF CAP149 .£2.30 10 10uF CAP110 £4.00 5 10 3300uF ..CAP62. £10.00 5 56uF CAP181 .£1.10 10 47uF CAP 196....£2.20 5 22uF CAP111 ..£2.50 2 5 4700uF ..CAP136 .£3.50 2 68uF CAP83 11.30 5 100uF CAP150 .£3.25 5 33uF CAP215 £2.50 2 10 100uF .CAP84 .£1.20 10 220uF CAP197 .£3.00 2 47uF CAP112 £3.50 2 5 40 VON* 150uF ..CAP85 .£2.80 5 470uF CAP198 £3.25 1 68uF CAP216 £3.50 2 2200uF ..CAP174 11.80 2 220uF ....CAP86 _12.80 10 100uF CAP160 £4.00 2 2200uF ..CAP175 .£2.00 1 330uF ..CAP87 14.00 10 Ycitat 150uF CAP217 ..£3.20 1 10 470uF ....CAP88 15.25 10 22uF CAP199 £1.60 5 220uF CAP161.. £7.00 2 10 CO Won:, 680uF ....CAP89 15.00 10 100uF CAP151 £3.25 5 560uF CAP162 £4.00 1 10 0.47uF CAP176 .£0.35 10 1000uF ..CAP90 .£5.40 5 220uF CAP200 £2.50 1 10 1uF CAP137....£0.35 10 2200uF .CAP182 .£2.20 1 330uF CAP201 £2.50 1 4110 Wale 5 2.2uF CAP138 .£0.35 10 4700uF .CAP183 .£4.00 1 1uF CAP113 £2.80 5 10 3.3uF CAP139....£0.35 10 gift VoNat 2.2uF CAP114 £3.20 5 10 4.7uF CAP140 .£0.35 10 900 M004/0 0.47uF.... CAP202 £0.60 10 13.3uF CAP218.. £3.20 5 10 6.8uF CAP177 .£0.45 10 0.1uF CAP184 .£0.80 10 1uF CAP152 £0.60 10 4.7uF CAP115....£4.95 5 5 10uF CAP63 10.50 10 0.22uF CAP185 .£0.80 10 2.2uF CAP203...11.30 10 10uF CAP116.. £5.50 5 10 22uF CAP64 10.70 10 0.33uF CAP186 .£0.80 10 3.3uF CAP104....£1.75 10 '22uF CAP117 £4.15 2 5 33uF CAP141 .£0.85 10 0.47uF ....CAP91 10.50 5 4.7uF CAP204 £2.00 10 33uF CAP219 £3.00 2 10 47uF CAP65 10.85 10 1uF CAP92 .£0.85 10 10uF CAP105 £2.60 10 47uF CAP220 £2.00 1 5 68uF CAP142 .£0.90 10 1.5uF CAP93 10.70 5 22uF CAP153 £2.30 10 100uF CAP221 £3.00 1 Aerial & Sa ellite Installation Accessories 3131 z2yAtiJJ :,47cirAplIglc4n Now with built in Digital ByPass Operates with Sky' DigiEye Class leading noise figure of 4dB or less 6dB signal amplification on all models Description 2 Way - No Bypass 2 Way - With Bypass 4 Way - No Bypass 4 Way - With Bypass 6 Way - No Bypass 6 Way - With Bypass 8 Way - No Bypass 8 Way - With Bypass Order Code SLX2 SLX2B SLX4 SLX4B SLX6 SLX6B SLX8 SLX8B Price £ 8.00 + vat £ 9.25 + vat £ 13.00 + vat £ 14.00 + vat £ 18.00 + vat £ 19.00 + vat £ 18.50 + vat £ 20.00 + vat 028ffl5115(44ac7 UHF TV antenna pre amplifier designed for the professional aerial installer 15dB gain masthead amplifier ideal for majority of domestic installations 26dB gain masthead amplifier for longer cable runs (loss of more than 3dB) or if connected to passive splitters Requires 12V DC power supply via downlead either via dedicated power supply unit or from a distribution amplifier with line powering 15dB Amp Order Code : 27830R Price : £ 4.30 + vat 26dB Amp Order Code : 27831R Price : £ 4.50 + vat SLx Masthead Amp PSU Order Code : 27832R Price : £ 5.00 + vat Postage for 24- £ 5.00 + vat ZIlauxalhdam Oder Code: PLG51 Bag of 10 Price : £ 1.25 + vat Bag of 100 Price : £9.00 + vat .Jccrc9\.w Typc; Goan P0010 V'w1 @co @CAOCKI®@(bY Oder Code: PLG62 Bag of 10 Price : £ 1.60 + vat Bag of 100 Price: £12.50 4 vat Order Code: PLG101 Bag of 10 Price : £ 1.00 + vat Bag of 100 Price: £ 6.00 + vat 11.)1'z .JeA®LI(114c9 Allows the user to find the best azimuth / elevation settings for a satellite dish , resulting in the best signal reception / picture and sound quality Compact design Backlit meter scale Audible signal strength reading Adjustable level control Adjustable sensitivity adjustment Frequency Range 950 - 2250Mhz Order Code : 27860R Price : £ 10.00 + vat ITErEgt_ C-E-) distrIbutor of allsdronic componerge Konig Replacement Remote Con 072582E CT2585 CT2885 CT2885E IR16 RC558 RC85 AISAI 199700 IR9700 1R9700 1R9700 1R9700 1R9397 1R9700 SRD550 SRX510 AE6001 AMSTRAD 1R9386 1R9386 1R9352 134Q Beolink 100 199843 RC51321 RC51331 RC61331 13115A1 1R9398 1R9398 1R9398 DLAUPUNKT 8869493 1532 1570-46 8627 105 463 8668813000 555-46 563-46 818 C16 D32 L32 M32 M55-16 M63-16 M70-18 P32 016 R32 TC106 TC110 PIP 10143 TC144 TC190 TC192 TC194 IR9188 1R9503 1R9516 1R9188 1R9516 1R9516 1R9516 1R9504 1R9504 1R9503 IR9503 IR9503 1R9516 1129516 1R9516 1R9503 1R9504 199504 1R9406 1R9248 IR9406 IR9406 1R9529 1R9529 1R9529 RC51331 RC61331 21907 CROWN 199398 1129398 1R9397 DAEWOO DM01414 DMQ14A 1 DMO20A 1 DMQ2195 DMQ2595 DMQ2895 1R9397 199840 199840 1R9840 1R9840 1R9840 20H3 22135 22H3 2415 2422 2423 2433 2445 2452 2453 2463 2475 26H3 29132 36K2 41H3 4233 4414 4415 4423 4433 51A0 51A2 51A3 51A4 51A5 5162 5103 51H3 51H4 51J7 511(3 5980 5982 59B3 5984 59B5 5902 5903 5902 5903 59H4 591-15 59J7 59LS2 6223 6245 66B2 66B3 86H3 66114 66115 FERGUSON 1129594 199584 199594 1139584 1R9584 189584 1R9584 1R9584 IR9584 199584 1R9584 1R9584 1R9594 1129584 1R9594 1R9594 199584 IR9584 IR9584 1R9584 199584 IR9584 1R9584 IR9584 199584 199584 1R9594 199594 1R9594 R9594 199594 199594 1129584 1R9584 IR9584 IR9584 199584 1R9584 1R9584 1R9594 1R9594 1129594 1R9594 1R9594 1R9639 IR9584 IR9584 1R9584 1R9584 199594 199594 .199594 Part No. Code Part No. Code FERGUSON -continued 68LS2 IR9639 A1OR 199259 A14R 1129259 A36R 1R9259 B51F 1R9639 B51NX 1R9639 B59F 1R9639 859N 1R9639 659NX 1R9639 B68F 199639 B68NX IR9639 C59NX IR9639 C68NX 1R9639 D51ND 199639 D59F 1129639 D59N 1R9639 D68N 199639 D78N 1R9639 E51N 1R9639 E5998 199639 RCU1734 IR9584 RCU1742 IR9584 RCU1785 1R9594 RCU1789 1R9594 RH880 1R9594 RH885 1R9325 RHT01 1R9259 RHT10 1R9639 RHT30 199259 T49F 1R9639 T49N 1R9639 T51F 199639 T51N IR9639 T59F 1R9639 T59N 1R9639 768N 199639 1742 1R9584 1752 1R9584 1758 1R9584 1789 1R9594 T78DPL 1R9639 GOLDSTAR 105-068 1052098 105210A 105-219J 105-224V 105-229H 105230A 105-230C 3811 CB20E4OX CBT2190E CBT4902 CBT4902E CBT9905 VS068K 1R9403 199862 1R9862 1R9854 1R9854 1R9854 1R9862 1R9854 IR9854 1R9854 1R9403 1R9403 1R9403 1R9403 199862 GRUNDIG CUC503 CUC5200 CUC5301 CUC5302 CUC5310 RC212 RC300 TP500VT TP590VT TP600VT TP610 TP621 TP630 TP650 TP661 TP661 TOP TP663 TP710 TP711 TP712 TP715 TP720 TP760H1F1 TP770 TP771 TP800 TP900 TRC1 TRC2 1R9614 IR9614 199529 1R9529 1R9614 1R9614 1R9614 1R9500 199509 199509 1R9509 199299 1R9509 199509 1R9562 199615 199614 1R9529 199529 1R9614 1R9749 1R9614 1129614 199749 1R9749 199749 1R9749 1R9715 1R9715 HITACHI 2970491 A518780 C1405 C1414 C2057H C2067 C2067H C2114 C2146TN C2147TN C2156TN C2166TN C2170TN C2186TN C2257H C2259H C2261 C2267H C2268H C2273 C2273H C24WITN C24W511TN 1R9479 1R9142 1129476 199476 1R9142 199142 199142 199476 199677 1129677 199983 1R9677 1R9983 199983 1R9142 1R9142 1R9142 199142 1R9142 199142 1R9142 199983 1129983 HITACHI _continued C24WS511T 189983 C2514 199476 C2546 1R9677 C2546TN R9677 C2547TN 199677 C25561N IR9983 C2566TN R9677 C2567TN R9983 C2567TN2 IR9983 C2586TN 1R9983 C2659H 1R9142 C2660 R9142 02661 1R9142 C2846TN R9677 C28471N 1R9677 C28561N IR9983 C2866TN IR9677 C2886TN R9983 C28W410TN IR9983 C28W510TN 1R9983 CBP14769 1R9142 CBP1646R 1R9142 CBP2067 189142 CBP2216 1R9142 CBP222 189142 CBP226 1R9142 CBP260 1R9142 CL2156TAN 1R9983 CL24W1TAN IR9983 CL2556TAN IR9983 CL2586TAN IR9983 CL2856TAN 1R9983 CL2886TAN IR9983 CL28W1TAN 189983 CL28WD2TAN 189983 CL32WD2TAN 189983 CLE871A 1R9602 CLE871B 1129602 CLE874A IR9602 CLE874B IR9602 CLE876 IR9476 CLE876C 189477 CLE876D IR9477 CLE876G 1R9477 CLE902A 199677 CLE902B 1R9677 CLE903A IR9677 CLE921A IR9983 CLE921B 199983 CLE922A IR9982 CLE922B IR9982 CLR876E IR9477 CP2146TA IR9677 CP2546 IR9677 CP2546TA 1R9677 CP2556TAN 189983 CP2841TA 199677 CP2856TA 1R9983 CP2856TAN IR9983 CP2886TAN IR9983 CP28WD2TAN 1R9983 CP32WD2TAN 1R9983 CPT1556 1R9576 CPT1557 CPT1560 IR9576 R9576 CPT1561 CPT2155 IR9576 R9575 CPT2164 1R9575 CPT2558 199575 CPT2564 199575 CPT2566 1R9575 CPT2669 1R9575 CPT2785 R9575 CPT2870 IR9575 CST1430 R9576 CST1435 1R9576 CST1560 199576 C12116 199476 CTRM200M IR9542 JIG AV21TS1EN AV25TSIEN AV25VM1EN AV28VMIEN AV29SXIEN AV29TS1EN AV32WZ2EN 908072 RC8074 RMC530 RMC682 RMC761 RMC7611E RMC770 RMC771 RMC7711E RMC793 RMC7931E 199698 IR9698 199698 199698 1R9698 1R9698 1R9698 199698 1R9698 1R9698 1R9698 1R9698 1R9698 1R9698 199698 1R9698 R9698 1R9698 93300 FB50 FB52 FB70 FB72 FB90 F991 LOEWE 1R9616 1R9514 1R9514 1R9514 1R9514 1R9514 1R9514 MATSUI 0766047240 076L067240 2076R 20921 1R9490 IR9490 IR9490 189490 3128 3126F C1 C2 C3 04 CM 1 D1 D2 El E2 EM2 ES5 FS10 FS11 FS4/1 FS4/2 FS5 FS5/1 FS9 FS9 RC1 RC2 RM1 RS1 RS2 RS3 RCN610 RCN620 RCN624 SM1 SM2 NOKta R9157 199157 1R9161 IR9161 1R9161 189161 1R9569 1R9161 199161 199161 1129161 199700 1R9701 1R9573 199506 199573 199573 199506 1R9573 199506 199573 199157 1R9157 1R9535 199535 1R9535 1R9535 1R9752 1R9751 1R9757 1R9491 1R9491 PANASONIC 02280227 91005926 EUR50100 EUR51920 EUR51921 1R3592 TC1485OR TC14S1R TC150E TC1656PFR TC1785DRS TC178519 TC1785UR TC2185DRS TC2185IR TC21R1C TC21R1U TC21S1R TCC23PFR Th01410 TNQ8E0421 TN08E0422 TNQ8E0428 TNQ8E0430 TNQ8E0432 TNQ8E0435 TNQ8E0436 TNQ8E0441 TNQ8E0461 TX14S1T TX21S1RC TX21S1T TX21S1TC TX21T1C TX25A2C TX25A2CI TX25W2 TX25W2C TX25W2CI TX28A1D TX28A2C TX28A2CI TX28W2 TX28W2C TX28XDPIC TX29AD10 TX29W2CI TX33A2C TX33A2CI PHILIPS RC5002 905140 RC5154 RC5240 RC5250 RC5260 RC5300 905350 RC5410 RC5420 RC5540 RC5701 RC5801 RC5801 RC5901 RC5903 RC6008 RC6404 RC6416 906512 RC6804 RC7118 RC7141 RC7500 RC7507 RC7512 RC7535 9C8201 RC8205 909010 1R9835 1R9835 1R9826 1R9835 199835 199826 1R9826 1R9834 1R9562 1R9826 1R9826 1R9826 R9826 R9826 1R9826 1R9826 1R9826 R9834 R9826 1R9826 1R9826 199826 1R9826 1R9826 199826 189836 1R9836 199826 1R9834 199834 1R9834 1R9834 1R9834 1R9826 1R9836 R9836 R9836 R9836 IR9836 199826 199836 1R9836 R9836 IR9836 199835 1R9835 R9836 1R9836 1R9836 1R9510 1129510 1R9510 1R9510 1R9510 1R9510 1R9510 1R9510 1R9553 199553 199510 R9434 1R9553 189556 189556 1R9556 1R9434 1R9465 1R9465 IR9464 1R9434 IR9464 IR9465 199464 199710 1R9864 1R9864 R9434 199710 1R9434 CMI@C 3 tA"0 Part No. Code Part No. Code PHILIPS ..continued RC9020 IR9434 RC9030 IR9434 RC9050 IR9556 RC9057 IR9710 RC9060 1R9556 RC9070 IR9434 RC9133 1R9710 SAMSUNG CX5312W CX5325W CX532WT CX534VYT RM104 RM109 IR9432 1R9432 199432 199432 1R9432 1R9546 SANYO 4AA4U1T0092 JXBA JXCL JXCR JXFF JXGA JXGE JXGT JXGW JXGY JXLB JXLG RC238 RC254 RC258 RC305 RC307 RC308 RC317 RC318 RC321 RC612 RC625 RC628 RC642 RC645 RC685 RC700 RC702 RC710 RC711 RC901 S02 003 1129459 IR9457 IR9530 1R9530 1R9457 199139 199139 1129460 1R9460 199460 199460 1129460 199974 IR9974 199530 1R9974 1R9457 199457 1R9457 1R9457 199457 1R9457 1R9457 1R9457 1R9530 1R9974 1R9457 1R9139 1R9139 199139 199460 1R9139 199460 199460 SHARE 37AM 12S 51AM12S 51AT15S 54AM12S 54AT15S 54CS05SN 5V2044 5V2145 70CS03S 72CS03S 72CSO5SN C1421 C2021 CV2121 CV3707 CV3709 CV3710 CV3720 DV1416SN DV1506SN DV1706SN DV210816 DV2130EX DV25071S DV25073S DV25081S DV25083S DV28037S DV28071S DV28081S DV28083S DV3750S DV3760S DV5160S DV5403S DV5432S DV5465S DV5470S DV5935H DV6301S DV6303S DV6311S DV6313S DV6332S DV63365 DV7001S DV70025 DV70035 DV7011S DV70245 DV7032S DV7036S RRMCG03510ESA RRMCG03510ESB. 99MCG03510ESD RRMCG0370CESA RRMCG0483PESA RRMCG0489CESB RRMCG0568PESA RRMCG0617PESA RRMCG0618PESA 1R9788 1R9788 1R9788 1R9788 1R9788 1R9711 1R9487 1R9487 1R9711 1R9711 199711 1R9487 1R9487 1R9487 1R9487 199487 1R9487 199487 1R9487 1R9487 1R9487 1R9711 199487 199711 199711 1R9711 1R9711 1R9711 1R9711 1R9711 199711 199788 199788 199788 1R9711 1R9711 1R9711 1R9711 R9711 199711 1R9711 1R9711 199711 1R9711 1R9711 189711 1R9711 1R9711 199711 R9711 199711 1R9711 1R9487 1R9487 1R9487 199487 199487 1R9487 1R9487 1R9487 1R9487 SHARP .continued RRMCG0662PESA 199487 RRMCG07398M5A 1R9711 RRMCG0777PESA 1R9487 RRMCG0833PESA 1R9487 RRMCG0898CESA 1R9487 RRMCG1014BM5A 199711 RRMCG1023BM5A 1R9711 RRMCG1031BM5A 1R9788 RRMCG1036BM5A 1R9711 RRMCG1046BM5A 199788 RRMCG1048BM5A 1R9788 RRMCG1050BM5A 1R9788 RRMCG2799CESA 1R9487 SV2044G 1R9487 SV2044S 1R9487 SV2145G 1129487 SV2145S 1R9487 SV2577S 199487 SV2777S1 199487 SV2877S 1R9487 SV2877S1 1R9487 RM604 RM607 RM609 RM615 RM620 RM625 RM630 RM631 RM632 RM633 RM634 RM635 RM640 RM641 RM641A RM650 RM651 RM652 RM654 RM656 RM657 RM658 RM661A RM670 RM671 RM672 RM673 RM677 RM681 RM682 RM683 RM684 RM685 RM686 RM687B RM687C RM689 RM694 RM698 RM717 RM719 RM816 RM817 RM820 RM828 RM828 RM830 RM831 RM832 RM833 RM834 RM836 RM837 RM839 RM841 RM842 RM883 RM886 SONY 1R9974 1R9974 1R9974 199511 1R9511 1R9511 1R9511 1R9511 199511 1R9511 199511 1R9511 199321 199321 1R9321 1R9336 1R9336 1R9336 1R9336 199448 199336 1R9321 1R9321 199123 199123 199123 1R9123 1R9448 1R9442 1R9442 1R9442 1R9442 1R9442 199442 1R9448 1129448 199441 199452 1R9442 1R9448 1129448 1R9441 1R9441 1R9452 1R9441 1R9452 1R9443 1R9443 1R9443 199451 199452 1R9871 199451 1R9871 199452 1R9443 1R9871 1R9871 THOMSON 140210570 14GM53 14GM56 14M570 21M576 21MG51 925TX1 049 RCT2000 RCT3000 RCT5000 RCT5020 RCT5141S 1R9639 1R9639 1R9639 1R9639 1R9639 199639 1R9508 1R9259 199831 1R9259 199502 199470 TOSHIBA 1400 14009 1400R9 14009BG 1400RBN 1400RBT 1400RBW 1400RDT 1440128 14409BT 1440RD 1440TB 1440191 1450RB 1450RD 14809B 1480RBT 1R9962 1R9962 1R9962 1R9962 1R9962 1R9962 1R9962 1R9962 1R9852 1R9852 199852 1R9852 1R9852 1R9852 1R9852 1R9953 1R9953 YtA Gitl@tb Part No. Code TOSHIBA -continued 1480RBW 199953 1480TB 1R9953 1480TBT 1R9953 1480TBW 1R9953 1480TBY 1R9953 1480TBZ 1R9953 1510REIT 199962 15109DT 1R9962 1510RT 1R9962 155R98 1R9962 155R98T 1R9962 155R9BW 199962 155R9BZ 1R9962 15699 199962 15699B 1R9962 156998G 199962 156R9BW 199962 172098 199962 1722TB 1R9852 1732TD 1R9852 210088 1R9962 210099G 1R9962 2100RBT 199962 21019BZ 1R9962 2102RBZ 199962 21219D 1R9962 213208 1R9852 214098 199852 214019 1R9852 214178 1R9852 2145DB 1R9852 2145DD 1R9852 215070 1R9953 2152DB 1R9953 2152DD 199953 2155DB 1R9953 2163DB 1R9953 2163DB 1R9953 216998 199962 2169982 1R9962 2173DB 1R9953 2180TD 199953 2181TB 1R9852 218119 199953 219R 1R9962 21999B 1R9962 2199962 1129962 2522DB 1R9953 2522DD 1R9953 2527DB 1R9953 2535DB 1R9852 253500 1R9852 253700 1R9852 2545DB 1R9852 254500 1R9852 255078 1R9953 2552DB 1R9953 255200 1R9953 2555 1R9953 2555DB 1R9953 255500 1R9953 2557DB 199953 2563DB 1R9953 256300 1R9953 2573DB 1R9953 2577DB 1R9953 2579DB 1R9953 26368 1R9953 2835DB 1R9852 28370D 1R9852 2852DB 1R9953 285300 1R9953 285500 1R9953 285709 1R9953 2857DD 1R9953 286300 1R9953 286600 1R9953 2873DB 1R9953 28771313 1R9953 2879DB 1R9953 3327DB 1R9953 3339DB 1R9953 3357DB 1R9953 3377DB 3387DB 1R9953 199953 3787DB 189953 40PW8DB 1R9953 48J6DB 48PJ6DG 1R9953 R9953 55PJ6DB 1R9953 56PW8DB 1R9953 70370D IR9852 7053DD 199953 CT6869 CT9369 1R9953 R9962 079383 199962 CT9387 189962 CT9396 1R9962 CT9399 189962 019414 199962 079432 1R9962 CT9455 IR9962 CT9475 1R9962 CT9476 199962 CT9480 199962 CT9552 1R9962 CT9626 IR9953 079784 1R9953 CT9785 1R9953 CT9859 1R9953 079867 1R9953 079868 IR9953 019900 IR9953 CT9949 1R9953 ELECTRONIC YLAAt gds&tC@CdC)(b ,CDY C;ca7p G2GackfacAG. tocA'oLL, 4loc)@,3s. ,ELECTRONIC td distributv of slaptrofic-zornbonents Transistors / Linear IC's Part No. BU208A BU2506DF BU2506DX BU2508A BU2508AF BU2508AX BU2508D BU2508DF BU2508DX BU2520AF BU2520AX BU2520DF BU2520DX BU2522AX BU2525A BU2525AF BU2525AX BU2525D BU2525DF BU2527AF BU2527AX BU2527DF BU2527DX BU2532AL BU2708AF BU2708AX BU2708DF BU2708DX BU2720AX BU2720DF BU2720DX BU2722AF BU2725AF BU2725DF BU2725DF BU2727AF BU2727A BU2727AF BU506DF BU508AF BU508APH BU508AXI BU5080 BU508DF BU508DR BUH1015 BUH1215 BUH515 BUH515D 8UH517 BUH517D BUH715 8UL310 BUL381 BUL381D BUT11A BUT11AF BUT11AX BUT12 BUT12A BUT12AF BUT18 BUT18A BUT18AF BUT56A BUT56AF BUZ71 BUZ71AF BUZ72A BUZ72AF BUZ73A BUZ73AF BUZ76A BUZ77A BUZ77B BUZ80 BUZ80AF BUZ83 BUZ900 BUZ901 BUZ905 BUZ906 BUZ90 BUZ90A BUZ90AF BUZ91A BUZ93 RF120 RF130 RF140 RF230 RF240 RF250 RF251 RF330 RF340 RF350 RF440 RF450 RF510 RF520 RF530 RF540 Price Part No. £0.75 £0.90 £1.00 £1.00 £1.10 £1.30 £1.30 £1.20 £1.50 £1.70 £1.40 £2.25 £2.00 £1.50 £3.25 £2.20 £1.90 £2.40 £1.75 £4.00 £2.50 £2.00 £2.00 £3.25 £2.00 £2.00 £2.00 .02.00 £2.00 £2.00 £2.00 £3.30 £2.00 £2.00 £2.00 £2.00 £2.00 £2.00 £1.00 £0.60 £0.60 £0.90 £0.75 £0.85 £1.30 £4.25 £4.50 £2.00 £2.50 £2.75 E1.75 £4.25 £1.25 £1.50 £1.25 £0.35 £0.35 £0.50 £0.80 £0.80 £0.90 £0.80 £0.80 £0.65 £0.65 £2.00 £0.75 £1.00 £1.00 £1.00 £1.50 £0.60 £1.10 £2.00 £2.50 £1.35 £2.00 £2.00 £10.00 £15.00 £10.00 £16.00 £1.50 £1.80 £2.80 £2.60 £1.50 £2.25 £4.75 £5.50 £5.50 £4.25 £3.75 £6.50 £6.00 £3.25 £7.50 £5.50 £6.50 £0.70 £0.75 £0.75 £1.00 RF5450 RF5740 RF5840 RF610 RF611 RF620 RF630 RF634 RF640 RF640F RF630S RF642 RF644 RF650 RF710 RF720 RF730 RF740 RF740F RF820 RF830 RF830F RF840 RF840F RF9140 RF9230 RF9510 RF9511 RF9520 RF9530 RF9531 RF9540 RF9541 RF9610 RF9620 RF9622 RF9630 RF9640 RFBC20 RFBC30 RFBC40 RFBE30 RFD120 RFD9120 RFD9220 RFF120 RFIBC40 RFIBC4OG RFP054 RFP140 RFP150 RFP240 RFP250 RFP340 RFP350 RFP360 RFP450 RFP460 RFP9140 RFP9240 RFPC40 RFPC50 RFPC60 RFPE40 RFPE50 RFPF40 RFPF50 RFS740 RFS840 RFZ20 RFZ42 RFZ44 RFZ46N RFZ48 MJ10016 MJ11015 MJ11016 MJ11032 MJ11033 MJ15003 MJ15004 MJ15015 MJ15016 MJ15022 MJ15023 MJ15024 MJ15025 MJE13004 MJE13005 MJE13007 MJE13009 MJE15028 MJE15029 MJE15030 MJE15031 MJE16002 MJE18004 MJE18006 MJE18008 MJE243 MJE253 MJE340 Price £5.00 £3.00 £3.00 £0.80 £1.20 £1.00 £0.75 £1.25 £1.50 £2.00 £2.00 £2.00 £2.00 £2.00 £1.50 £0.85 £1.25 £0.90 £3.00 £0.90 £0.85 £1.60 £0.85 £1.75 £10.00 £4.00 £1.50 £1.50 £1.50 £1.25 £2.00 £1.75 £2.00 £0.95 £0.85 £2.00 £1.30 £2.30 £1.10 £1.20 £2.10 £2.25 £1.00 £1.20 £1.00 £3.00 £1.00 £2.00 £4.00 £2.50 £2.40 £3.00 £2.80 £2.50 £3.25 £8.00 £2.70 £4.00 £14.50 £3.00 £3.00 £4.50 £8.00 £5.50 £4.50 £5.50 £4.50 £1.75 £1.25 £0.85 £2.75 .£1.60 £1.50 £2.75 £7.00 £2.50 £3.00 £8.00 £8.00 £2.50 £3.00 £2.50 £3.50 £4.00 £4.00 £3.00 £3.00 £1.00 £0.60 £1.00 £1.00 £2.00 £2.00 £2.50 £4.00 £3.00 £1.25 £1.20 £1.50 £0.60 £0.85 £0.25 Part No. Price MJE350 MJF Eaeo MJF16206 £4.50 MJF18004 £1.75 MJF18008 £2.00 MJF18008 £1.75 MJF18204 £2.50 STK0025 £4.20 STK0039 £6.00 STK086 £10.00 STK1039 £4.60 STK1040 £6.40 STK1049 STK1050 £7.00 £6.50 STK1060 £7.00 STK2025 £6.20 STK2028 £5.00 STK2029 £6.00 STK2030 £10.00 STK2038 £7.00 STK2048 £9.50 STK2058 IV £16.00 STK2101 £10.50 STK2110 £5.50 STK2139 STK2155 £6.75 £9.00 STK2230 £4.70 STK3102 II £5.30 STK3106 £25.00 STK3122 III £7.25 STK3152 II £9.00 STK3156 £5.00 STK350-030 £7.00 STK392-040 £12.00 STK401-050 £8.00 STK401-080 £9.00 STK401-120 £10.00 STK401-140 £12.00 STK4017 £4.00 STK4019 £4.80 STK402-040 £7.00 STK402-070 £7.00 STK402-070 £7.00 STK402-071 £7.00 STK402-090 £8.00 STK4021 £3.80 STK402-100 £9.00 STK402-100 £9.00 STK402-120 £9.00 STK4024 II £5.50 STK4025 STK4026 £5.30 £4.80 STK402611 .04.80 STK4026V £5.00 STK4028 £5.50 STK4032 fl £5.10 STK4034 X STK4036 £9.25 £4.70 STK4036V £8.00 STK4038 £6.80 STK4040 II £6.50 STK4042 II £8.00 STK4046 £9.50 011(4050 II £16.00 STK405-030 £7.00 STK405-050A £12.00 STK405-070A £8.00 STK4050V £15.00 STK405-120 £11.00 STK4060 STK4085 STK407-040 £5.10 £6.50 £7.00 STK407-070 £8.50 STK407-090 £8.50 STK4101 £5.00 STK4111 £400 STK4112 £5.00 STK411-230 £12.00 STK411-240E....£14.00 STK4121 £460 STK412-150 £18.50 STK4122 £5.80 STK4130 II £7.00 S1K413011 £7.00 STK4131 £4.80 STK4132 II £6.00 STK4133 II £7.50 STK4140 II £8.00 STK4141 0 £4.20 STK4141 V £6.00 STK4142 £5.30 STK4151 STK4152 £6.80 £6.50 STK4154V £14.00 STK4161 £6.50 STK4161V £8.50 STK4162 £5.50 STK4164 II £11.75 STK4171 £9.00 STK417-130 £15.00 STK4172 II £6.80 STK4181 £6.80 STK4182 II £9.00 Part No. Price STK4191 £9.00 STK4191 X £14.00 STK419-130 £15.00 STK419-140 £16.00 STK4192 £7.00 STK4197 II £9.50 STK4199 II £10.50 STK419911 £10.50 STK420 £4.00 STK4204 II £10.50 STK420411 £10.50 STK4211 II £10.00 STK4211 V £8.00 STK4221 II £12.00 STK4231 II.. £10.50 STK4231 V £14.00 STK4241 £10.50 STK4241 V.,......£12.50 STK4272 £5.00 STK4273 £5.50 STK4274 £5.00 STK4274 £5.00 STK430 £5.00 STK4301 STK4311 £5.00 £6.50 STK433 £4.00 STK4332 £3.65 STK435 £3.75 STK4352 £5.00 STK436 £4.30 STK4362 STK437 £4.50 £6.00 STK4372 £4.90 STK439 £5.00 STK4392 £5.00 STK441 £6.80 STK4412 £4.50 STK443 £7.00 STK4432 £6.00 STK457 £4.70 STK459 STK460 £5.60 £6.60 STK461 £6.00 STK463 £9.50 STK465 STK4773 £9.00 £8.20 STK4793 £8.00 STK4803 . STK4813 STK4833 STK4843 . £10.00 £8.00 £8.50 £7.20 STK4853 . . £17.00 STK4863 £7.00 STK4873 £11.00 0TK488-010 £8.00 STK488-050 £8.00 STK4893 . STK4913 . £10.00 £9.00 STK501 £5.50 STK50322 £3.50 STK5314 . £4.75 STK5315 STK5323 S1K6324 £5.00 £6.00 £3.00 STK5325 £3.70 STK5326 £7.50 STK5330 £8.50 STK5331 £3.00 STK5332 £1.80 STK5333 £6.50 STK5335 £3.50 STK5336 .... ....... £3.50 STK5337 £5.00 STK5336 £2.95 STK5339 £4.00 STK5340 £3.50 STK5342 STK5343 £2.45 £3.80 STK5352 STK5352 STK5353 £5.00 £5.00 .04.00 STK5381 £3.75 STK5362 £4.00 STK5364 £2.50 STK5364 £2.50 STK5371 £3.50 STK5371 £3.50 STK5372 £2.60 STK5373 £3.75 STK5383 £3.00 STK5391 £3.75 STK5392 £5.00 STK5421 £4.50 STK5422 £3.75 STK5431 £5.50 STK5434 £5.70 STK5436 £5.00 STK5441 £3.50 STK5443 £5.75 STK5446 £3.50 STK5451 £3.90 STK5461 £5.00 STK5462 ..... ...... .£3.50 Part No. STK5464 STK5466 STK5467 STK5468 STK5471 STK5472 STK5473 STK5474 STK5476 STK5477 STK5478 STK5479 STK5481 STK5482 STK5483 STK5486 STK5487 STK5488 STK5490 STK561 STK563 STK5632 STK5720 STK5725 STK5730 STK583 STK6316 STK6324B STK6327 STK8328A STK6431 STK6607 STK6712BIV STK6722 STK6732 STK6822 STK6875 STK6922 STK6932 STK6962 STK6972 STK69818 STK6982 STK6982H STK7216 STK7217 STK7225 STK7226 STK7233 STK7251 STK7253 STK730-060 STK730-080 STK7308 STK7309 STK7310 STK73405 II STK73410 STK73410 II STK7348 STK7356 STK7358 STK7359 STK73605 STK73907 STK73908 STK73908 STK7402 STK7404 STK7406 STK7406H STK7408 STK7410 STK7458 STK746 STK752 STK7554 STK7581 STK7561A STK7562 STK7563 STK7563F STK7573 STK7576 STK760 STK761 STK770 STK7707 STK780 STK78603 STK78617 STK795 STK8050 STK8250 STK8260 STK8280 STR10006 STR11006 STR17006 STR20005 STR30115 STR3315 STR370 Price £3.00 £5.00 £4.00 £3.00 £9.00 £375 £4 80 £5.00 £3.50 £4.50 £2.50 £3.00 £4.70 £2.85 £4.40 £4.50 £5.25 £4.80 £4.50 £4.00 £4.15 £3.00 £4.00 £3.50 £3.00 £4.00 £3.00 £5.00 £12.00 £4.00 £6.00 £4.00 £5.50 £6.50 £10.00 £7.50 £8.50 £10.00 £4.50 £2.75 £3.00 £5.00 £6.00 £6.00 £4.20 £2.50 £5.00 £1.7.00 £7.00 £5.00 £6.50 £6.50 £6.00 £700 £4.00 £3.20 £5.50 £3.50 £5.00 £4.00 £4.25 £4.40 £4.25 £3.75 £7.00 £5.50 £5.50 £5.60 £6.00 £6.50 £7.50 £6.75 £15.00 £12.50 £9.00 £3.00 £4.80 £6.50 £7.00 £10.00 £8.00 £6.50 £3.00 £15.00 £5.00 £3.00 £4.00 £9.00 £4.80 £7.50 £24.00 £3.25 £16.00 £5.00 £12.00 £18.50 £4.50 £3.25 £5.00 £4.50 £2.75 £2.75 £3.00 Part No. Price STR371 STR380 STR381 STR383 STR384 STR40090 STR40115 STR4090A STR41090 STR4142 STR4211 STR43111 STR440 STR441 STR44115 STR442 STR450A STR451 STR45111 STR4512 STR452 STR453 STR454 STR455 STR456 STR457 STR470 STR50020 STR50092 STR50103A STR50112A STR50113 STR50115 STR50213 STR50330 STR51041 STR51213 STR51424 STR53041 STR54041 STR5412 STR55041 STR56041 STR58041 STR59041 STR60001 STR6008X STR6020 STR61001 STR7001 STR80145 STR81145 STR81159 STR8124 STR83145 STR83159 TDA1420 TDA1470 TDA1514A TDA1540 TDA1541 TDA1541A TDA1546T TDA1547 TDA15520 TDA1553AQ TDA1553C0 TDA15540 TDA15550 TDA1558Q TOA15570 TDA15580 TDA1561Q TDA15620 TDA1580 TDA1599 TDA1602A TDA16846 TDA1670A TDA1875 TDA1675A TDA16833 TDA16846 TDA1701 TDA1770 TDA1771 TDA1870A TDA1872A TDA1908A TDA1940 TDA1941 TDA2003 TDA2004 TDA2005 TDA2006 TDA2009 TDA2020 TDA2030 TDA2030H TDA2048 TDA2050V TDA2051V TDA2052V £4 00 £3.50 £3.90 £4.10 £3.50 £3.50 £6.00 £6.50 £3.30 £4.50 £3.15 £9.50 £8.00 £9.50 £4.75 £16.00 £7.00 £8.00 £5.50 £4.00 £475 £5.00 £13.00 £5.50 £4.70 £6.00 £3.00 £3.50 £5.50 £2.60 £6.50 £5.00 £5.00 £4.00 £4.75 £5.00 £5.00 £7.00 £4.00 £3.20 £2.80 £4 50 £5.50 £2.50 £3.00 £5.25 £5.75 £2.70 £4.75 £6.00 £4.75 £3.75 £4.00 £10.00 £5.00 £7.00 £8.00 £12.00 £3.25 £4.20 £5.00 £4.00 £10.50 £10.00 £3.50 £325 £3.00 £3.00 £3.75 £3.25 £3.00 £3.00 £5.00 £5.50 £4.25 £4.00 £4.00 £2.00 £2.00 £2.50 £2.00 £2.00 £2.00 £14.00 £7.50 £2.00 £2.00 £2.75 £2.50 £6.00 £300 £0.65 £1.50 £1.50 £0.70 £1.60 £1.20 £0.80 £1.00 £6.00 £2.00 £4.50 __5525 Part No. TDA2450-3 TDA2460-2 TDA2501 TDA2506T TDA2507 TDA2510 TDA2514A TDA2515 TDA2520-1 TDA2521 TDA2522 TDA2523 TDA2525 TDA2530 TDA2548 TDA2549 TDA2558 TDA25600 TDA2560-3 TDA2574V TDA2576A TDA2577A TDA2578A TDA2579A TDA25798 TDA2652 TDA2653A TDA2710-1 TDA2820M TDA2822M TDA3190 TDA3301B TDA3303 TDA3501 TDA3502 TDA3504 TDA3507 TDA3521 TDA3560 TDA3561 TDA3561A TDA3562A TDA3583 TDA3563A TDA3564 TDA3565 TDA3566 TDA3566A TDA3567 TDA3569 TDA3570 TDA35768 TDA3650 TDA3651 TDA3651A TDA3652 TDA3652TX10 TDA365313 TOA3653C TDA3654 TDA3654Q TDA3724 TDA3725 TDA3730 TDA3740 TDA3750 TDA3770 TDA3771 TDA3803A TDA4400 TDA4420 TDA4421 TDA4422 TDA4427 TDA4429T TDA4431 TDA4474 TDA4480 TDA4481 TDA4482 TDA4500 TDA4501 TDA4502 TDA4503 TDA45048 TDA4505A TDA4505E TDA4510 TDA4556 TDA4557 TDA4560 TDA4565 TDA4566 TDA4568 TDA4580 TDA4600 TOA460011 TDA4601 TDA4601D TDA4605 TDA4610 TDA4650 TDA4651 £10.00 £0.70 £3.00 £8.00 £4.50 £4.50 £5.00 £4.50 £9.00 £8.00 £12.00 £8.50 £4.50 £3.00 £2.00 £3.00 £4.00 £7.00 £14.00 £3.50 £9.00 £2.00 £7.00 £2.10 £3.25 £48.00 £4.50 £4.00 £1.00 £0.60 £2.00 £16.00 £7.00 £3.00 £3.60 £3.00 £4.50 £7.50 £6.00 £3.00 £3.00 £2.60 £3.50 £4.00 £3.25 £2.20 £2.80 £3.00 £3.50 £3.00 £3.75 £7.00 £6.75 £2.00 £3.50 £5.00 £8.00 £0.80 £0.85 £0.80 £0.85 £3.00 £3.00 £4.00 E4.00 E4.00 £7.75 £4.60 £5.00 £1.75 £1.20 £3.00 .£2.00 £3.00 £20.00 £1.50 £4.00 £6.00 £2.15 £1100 £3.00 £2.80 £4.00 £3.25 £8.00 £3.00 £6.50 £2.00 £3.70 £4.00 £2.70 £1.50 £2.50 £2.25 £10.00 £2.00 £1.60 £1.20 £0.65 £1.90 03.70 £3.00 £8.00 Part No. Price TDA4665 TDA4670 TDA4671 TDA4680 TDA4681 TDA4685 TDA4686 TDA4687 TDA4700A TDA4710H TDA4714C TDA4716C TDA4720 TDA4725 TDA4780 TDA4800 TDA4810 TDA4850 TDA4851 TDA4852 TDA4854 TDA4855 TDA4858 TDA4858 TDA4860 TDA4861 TDA4866 TDA4880 TDA4918A TDA4930 TDA4935 TDA4940 TDA4941 TDA4942 TDA4950 TDA4951 TDA5010 TDA5400 TDA5500 TDA5600 TDA5610-2 TDA5620 TDA5702 TDA5830-2 TDA61000 TDA6101Q TDA61030 TDA6106C1 TDA61070 TDA6108JF TDA6111Q TDA6120Q TDA6160-2S TDA6160-2X TDA7052 TDA7058 TDA7262 TDA7263 TDA7263M TDA7264 TDA7265 TDA7266 TDA7269 TDA7269A TDA7293V TDA7294V TDA7295 TDA7296 TDA7297 TDA7300 T047302 TDA7310 TDA7312 TDA7313 TDA7318 TDA7330A TDA7340 TDA7350 TDA7359 TDA7360 TDA7362 TOA7365 TDA7370V TDA7372A TDA7374V TDA7375V TDA7376B TDA7377 TDA7381 TDA7384A TDA7385 TDA7386 TDA7393 TDA7394 TDA7396 TDA7431 TDA7439 TDA749S TDA7560 TDA8000 TDA8118 TDA8120B TDA8137 £2.50 £4.75 £5.00 £3.50 £4.50 £2.75 £5.00 £5.00 £7.50 £7.00 £3.50 £4.50 £6.60 £7.50 £6.00 £300 £5.00 £4.75 £325 £3.25 £5.00 £6.00 £5.00 £3.50 £2.00 £3.50 £2.75 £4.50 £17.00 £5.00 £3.00 £2.00 £2.80 £2.00 £1.00 £4.50 £3.00 £6.00 £9.00 £4.50 £7.50 £4.50 £13.00 £11.00 £1.50 £1.20 £2.25 £1.25 £3.00 £3.00 £2.25 £5.50 £4.75 £2.50 £1.20 £2.00 £3.25 £3.50 £4.00 £5.00 £5.00 £5.00 £5.00 £2.75 £5.50 £5.50 £4.00 £5.00 £3.50 £5.50 £4.50 £8.00 £4.50 £6.50 £5.50 £7.00 £8.00 £3.00 £3.00 £7.00 £4.50 £5.50 £3.25 £4.50 £3.50 £5.25 £10.00 £4.50 £11.00 £11.00 £10.00 £11.00 £10.00 £8.00 £4.50 £7.00 £6.50 £4.25 £18.00 £4.25 £3.50 £4.00 £2.00 Part No. Price TDA8138 TDA8138A TDA81388 TDA8139 TDA8140 TDA8143 TDA8145 TDA8146 TDA8153 TDA8170 TDA8171 TDA8172 TDA8173 TDA8174 TDA8175 TDA8177 TDA8177F TDA8179S TDA8180 TDA8205 TDA8212 TDA8214B TDA8215H TDA8217 TDA8303 TDA8304 TDA8305 TDA8305A TDA8310 TDA83500 TDA8351 TDA8354Q TDA8356 TDA8360N3 TDA8361AN3 TDA8361N3 TDA8362AN TDA8362AN3 TDA8362BN3 TDA8362N3 TDA8362N4 TDA8362N5 TDA8366N2 TDA8366N3 TDA8370 TDA8372A TDA8374 TDA8375A TDA8376 TDA8380 TDA8424 TDA8425 TDA8432 TDA8433 TDA8440 TDA8443 TDA8451 TDA8453 TDA8461 TDA8501 TDA8505 TDA85600 TDA8561Q TDA8562Q TDA85630 TDA8565Q TDA8566Q TDA8567Q TDA8568Q TDA8569Q TDA8571J TDA8703 TDA8708 TDA8709 TDA8741 TDA8745 TDA8840 TDA8841 TDA8842 TDA8843 TDA8844 TDA9102C TDA9103 TDA9105 TDA9109 TDA9141 TDA9143 TDA9144 TDA9151 TDA9160A TDA9162 TDA9170 TDA9176 TDA9177 TDA9210 TDA9302H TDA9500 TDA9503 TDA9610H TDA9614H £2.00 £1.30 £2.00 £2.00 £2.00 £1.60 £1.20 £2.00 £10.00 £1.70 £2.30 £2.00 £1.75 £2.00 £7.00 £3.00 £3.50 £7.50 £12.50 £12.50 £3.50 £10.50 £3.00 £2.25 £2.50 £4.00 £5.00 £5.00 £6.00 £2.75 £2.00 £2.75 £2.00 £8.00 £8.00 £9.00 £12.00 £7.50 £8.50 £12.00 £9.00 £12.00 £15.00 £11.50 £11.50 £16.50 £10.00 £12.50 £15.00 £2.00 £4.00 £5.00 £5.50 £6.00 £3.00 £3.50 £3.25 £3.50 £9.50 £3.75 £11.00 £4.25 £5.25 £5.00 £4.75 £11.00 £5.50 £7.00 £6.00 £8.00 £9.00 £5.00 £6.00 £7.00 £5.50 £8.50 £10.00 £10.00 £14.00 £15.00 £14.00 £2.50 £4.75 £5.00 £10.00 £6.25 £4.00 £12.00 £11.00 £9.50 £11.00 £7.00 £6.50 £8.00 £4.50 £2.25 £7.50 £9.00 £9.50 £8.00 Please note that this a very small selection of the transistors and IC's that we stock. We stock a full range of Japanese Transistors 2SA,2SB, 2SC,2SD,2SJ,2SK series , Diodes , CMOS , TTL Logic ICs , Computer ICs , Zenor Diodes...etc XR House 9 UnIlIa 9 Pop 011 Commercial tamin Southway MC)) ONC) 2t) Batt °, 162t) ttt tl2t Midc.1.z .1-1A9 01-.1:33 Eilff1T.-11] -1;:;..1.161jgr-E11.1dS1k1111,ri9A.Lif (' r 711i 0 osrits: Line Output Transformers Yeall No Pturl G7o @oda Pagoo Para Os Saes !Polo LedlUIS a .41 kcientnto unrinskso Riarl No toVo Palos 3714002 043714002J 43700000 ALBA LOTO2 LOTO2 LOTO2 AMSTRAD 1810951 LOT55 3714002 LOTO2 043714002J LOTO2 43700000 LOTO2 AM152591 LOT55 YLVGIONAMOO 00 D-3-508-002 ....L0T381 06 D-3-083-001 LOT82 06 D-3-083-002 LOT82 06 0-3-084-001 LOT23 06 D-3-087-001 LOT23 06 D-3-088-001 LOT84 06 0-3-093-001 ....LOT204 06 0-3-508-003 ....LOT276 06 D-3-512-001 ....LOT204 29201-022-01 L0T63 473197 LOT304 D 059 / 37 LOT200 0,0002Vgag 1142.5057 LOT1164 1142.5077 LOT1164 1142.5079 LOT1164 1142.5081 LOT1164 1152-5016 LOT1934 1179.0387 LOT1147 1192.0527 LOT1147 1352.5008 LOT1167 1352.5008E LOT1167 1352.5016 LOR1934 1352.5027 LOT1270 1352.5033 LOT1270 3714002 043714002J 43700000 CF 124 B CF 124 E 170Gankg LOTO2 LOTO2 LOTO2 LOT67 LOT67 2424593 2432461 2432761 WITAM70 LOT44 LOT169 L0T169 £12.00 £12.00 £12.00 £14.00 £12.00 £12.00 £12.00 £14.00 £15.50 £12.50 £12.50 £12.50 £12.50 £14.50 £16.00 £14.00 £16.00 £17.00 £15.50 £14.00 £15.00 £15.00 £15.00 £15.00 £19.00 £16.00 £16.00 £15.00 £16.00 £19.00 £16.00 £16.00 MIZaTag,,,,000slaveosa7 2433453 LOT82 £12.50 2433751 LOTO1 £13.00 2433752 LOTO1 £13.00 2433891 LOT23 £12.50 2433892 LOT84 £14.50 2433893 LOT23 £12.50 2433952 L0T33 £10.00 2434002 LOT226 £14.50 2434141 LOT33 £10.00 2434274 LOT44 £10.50 2434393 LOT405 £22.50 2434593 LOT44 £10.50 2435006 LOT401 £17.00 2435131 L0T251 £14.50 2436201 LOT90 £12.50 23236465 LOT392 £15.00 2433891H L0T23 £12.50 45150504 LOT362 £16.00 IMMO 20070 LOT438 20071 L0T438 20072 LOT438 20073 L0T438 20074 L0T438 20075 L0T438 3714002 LOTO2 3221008 L0T438 043714002J LOTO2 043221088P L0T438 43700000 LOTO2 7140021 LOTO2 £16.00 £16.00 £16.00 £16.00 £16.00 £16.00 £12.00 £16.00 £12.00 £16.00 £12.00 £12.00 0704OOMI1:9G10 731003 LOT51 334 P 18506 LOT51 40153201 Ca1041 L0T349 £15.50 £15.50 £17.50 £12.00 £12.00 £12.00 £14.50 £14.50 £10.50 £15.00 £15.00 3714002 043714002J 43700000 ()LWOW LOTO2 LOTO2 LOTO2 PtINAKMUO TLF 14512 F LOT39 TLF 14520 F LOT40 TLF 14521 F LOT39 TLF 14567 F L0T39 £12.00 £12.00 £12.00 £18.50 £15.00 £18.50 £18.50 PANAS 0 N ge,egagaDmaxi) TLF 14568 F LOT40 £15.00 TLF 14584 F LOT41 £17.00 TLF 14586 F LOT42 £17.00 ligft701043 3119 108 31260 . .LOT90 3119 108 31290 ....L0T73 3119 108 31440 L0T433 3119 108 31441 L0T433 3119 108 31442 L0T433 3119 198 62930 . .LOT57 3122 108 10246 LOT111 3122 138 36070 LOT111 3122 138 36072 LOT111 3122 138 36920 . .LOT57 3122 138 36922 . .LOT57 3122 138 36923 . .LOT57 3122 138 37050 LOT132 3122 138 37620 . .LOT90 3122 138 37771 L0T129 3122 138 37992 ..LOT1116 3122 138 38040 ....L0T73 3122 138 38123 LOT395 3128 138 20200 L0T433 3128 138 20201 L0T433 3128 138 20202 LOT433 3138 108 30100 LOT106 3138 108 30101 LOT106 3138 108 30103 LOT106 3139 128 30400 . .LOT90 40348-08 LOT1577 40348A-08 LOT1577 40348A-09 LOT1577 4812 140 10246 . LOT111 4812 140 10349 LOT106 4812 140 10369 . .LOT90 4812 140 10421 . .LOT90 4822 140 10246 . LOT111 4822 140 10274 L0T123 4822 140 10306 ....LOT57 4822 140 10349 LOT106 4822 140 10381 .. LOT128 4822 140 10384 L0T127 4822 140 10406 . .LOT73 4822 140 10544 L0T433 4822 140 10566 ..LOT433 AT 2076 / 10 LOT57 AT 2077 / 81 LOT121 AT 2078 / 21 LOT395 AT 2079 / 15 LOT129 £12.50 £11.50 £16.00 £16.00 £16.00 £11.00 £15.00 £15.00 £15.00 £11.00 £11.00 £11.00 £15.00 £12.50 £14.00 £19.00 £11.50 £12.00 £16.00 £16.00 £16.00 £12.50 £12.50 £12.50 £12.50 £18.00 £18.00 £18.00 £15.00 £12.50 £12.50 £12.50 £15.00 £14.50 £11.00 £12.50 £13.00 £15.50 £11.50 £16.00 £16.00 £11.00 £15.00 £12.00 £14.00 INIMMMIP CD Pick Ups and Mechanisms PC011.0,90-soollaxosa2 AT 2079 / 21 L0T395 £12.00 AT 2079 / 24 LOT392 £15.00 AT 2079 / 40 LOT73 £11.50 AT 2079 / 99 LOT276 £14.00 AT 2079/30 01 LOT106 £12.50 AT 2079/30102 LOT106 £12.50 3714002 043714002J 43700000 7140021 gIGIONED LOTO2 LOTO2 LOTO2 LOTO2 HARP RTRNF 1220 CEZZLOT39 RTRNF 2001 CEZZLOT338 RTRNF 2006 CEZZLOT308 RTRNF 2023 CEZZLOT310 £12.00 £12.00 £12.00 £12.00 £18.50 £17.50 £13.50 £15.00 0@lig7 1-439-286-00 L0T46 1-439-286-11 LOT46 1-439-286-12 L0T46 1-439-286-13 LOT46 1-439-286-21 L0T46 1-439-332-41 LOT100 1-439-332-42 LOT101 1-439-332-52 LOT100 1-439-363-11 LOT268 1-439-363-21 LOT268 1-439-387-11 LOT311 1-439-387-21 LOT311 1-439-416-11 ........LOT255 1-439-416-12 LOT255 1-439-416-21 LOT255 1-439-416-23 L0T255 1-439-416-41 L0T255 1-439-416-51 LOT255 £13.00 £13.00 £13.00 £13.00 £13.00 £15.00 £14.50 £15.00 £14.00 £14.00 £14.50 £14.50 £16.00 £16.00 £16.00 £16.00 £16.00 £16.00 fillOVIOCRO 105009.8 LOT1505 10500980 LOT1505 10500980.P1 LOT1505 10531460 LOT1505 105660.6 Lan 505 105660060 LOT1505 10566060 LOT1505 10566060.P2 LOT1505 105880.8 L0T1505 10588080 LOT1505 £19.00 £19.00 £19.00 £19.00 £19.00 £19.00 £19.00 £19.00 £19.00 £19.00 4110[284KM-oomatiumoal 10588080.P2 LOT1505 £19.00 151128140 LOT1505 £19.00 151281.4 LOT1505 £19.00 15128140 LOT1505 £19.00 153144.6 LOT1505 £19.00 15314460 L0T1505 £19.00 1531447 A LOT1505 £19.00 1532873 A L0T1505 £19.00 3233500 LOT244 £14.50 3233900 LOT244 £14.50 40011200 LOT244 £14.50 40148300 LOT244 £14.50 VONIEttai 1810951 LOT55 2433751 LOTO1 23236098 LOT288 23236198 LOT288 23236201 LOT395 23236245 LOT395 23236255 LOT289 23236425 L0T288 23236427 LOT395 23236428 L07289 23236424 LOT129 TFB 4090 AD LOT395 TFB 4124 AE LOT392 TFB 4124 AP LOT392 £14.00 £13.00 £14.00 £14.00 £12.00 £12.00 £15.00 £14.00 £12.00 £15.00 £14.00 £12.00 £15.00 £15.00 We are stockist of both Konig and HR Diemen LOPT's This is just a selection of the LOPT's that we stock....Please call on 020 8900 2329 for copy of our LOPT catalogue Part No Price CDM12.1 Mechanism . £14.00 KHM220AAA DVD Laser £ 40.00 KSS 210A Original £11.00 KSS 210A Replacement £9.50 KSS 210 B £15.00 Part No KSS 213 B KSS 213 C KSS 213 D KSS 213 F KSS 240 A NKS 240 A Replacment for KSS240A Price £8.75 £9.50 £16.00 £12.00 £30.00 . . £20.00 Part No Price OPTIMA 6 S £11.50 OPTIMA 5 £11.50 RCTRTH8151 £20.00 RCTRTH8112 £14.00 RCTRH8147 Mech . . . £ 10.00 Check out our Online Catalogue at www.grandata.co.uk This advertisement is just a selection of our stock. Please contact us if you cannot find the part you are looking for. * Please add £1 p+p and VAT to all orders (Unless Otherwise stated) * All components are brand new * We accept payment by Access , Switch , Visa , Cheque and Postal Order * All prices quoted are subject to availabilty and may be changed without prior notice E & OE K P House Unit 15 Pop Orto itc4rmin taaalkiwtly Wcambllw Uldc3h)t(aa NAV ON I3 Ehglan4 Tel !: (020) 8900 ALffitIlLI tic;ag, cetIciachAthat.a Fax (020) 8903., 6 2 www4cretwachikti.c)Alt 3gitaNitta College of NW London serves business The College of NW London has been expanding the range courses and services on digital technology it offers to firms of all types and sizes. Digital Village, launched two IIhyeears ago at the College of North West London, is extending its range of services to provide short courses for small- and medium-sized businesses. So far over 700 businesses in West London have benefited from the two-year project, which has provided free advice and support, including seminars and workshops, on all aspects of digital technology. The college now has three Centres of Vocational Excellence (CoVE), all in the Faculty of Technology. This is an unprecedented achievement, reflecting the status of the college as a centre of technology in the UK. Digital Village activities are being expanded to include free analysis of training needs for businesses and an extensive range of low-cost, short courses designed to provide essential skills in a variety of digital fields. The Digital Village is managed by senior lecturer Fawzi Ibrahim, who is the author of several books on electronics, television and computers. He comments: "We have found that businesses require more than just advice. They need the know-how to enable them to make full use of the new digital technology. It isn't so much qualifications that are needed, rather knowledge of the basic and essential skills that enable full use to be made of digital technology. We have state-ofthe-art facilities and equipment that we are keen to make available to engineers and businesses to exploit." The Digital Village now offers a vast range of short courses in digital technology. The aim is to provide businesses with short, com- pact courses of one, two or three days' duration, covering the essential skills in a particular field - skills that can then be immediately employed in the job. All participants get a Digital Village certificate. If they wish to gain a City and Guilds qualification or sit a trade examination they can do so through the college's extensive list of courses. The courses on offer range from digital audio and video broadcasting and reception to computer repair and Windows 2000 network administration and infrastructure. One course covers aerial installation for digital TV and audio transmissions. As the analogue switch -off approaches, aerial installers will be as much in demand as plumbers are today. Furthermore many people will want video distribution of some sort in their homes, in order to make full use of second and third TV sets. For this reason a one -day course on IF distribution is available. Another course that should be of interest to network, aerial and electrical installers covers network cabling using both copper and fibre optics. On the IT side, courses include network administration (three days), e -commerce (three days), wireless networks (one day), broadband (one day), PC configuration and troubleshooting (three days) and network routeing (CISCO) systems. All courses involve a unique combination of theory and hands-on practical tasks carried out with industry -standard equipment. The college offers flexibility in terms of dates, place and course contents to suit the requirements of businesses. For full details of dates, duration and fees, phone 020 8830 3483 or email: FI@[email protected] www.DigitalVillage.cnwl.ac.uk March 2004 TELEVISION 287 A day in the life o Ai..44./ / / / / / /I / r I - /.1 . ///,//,//// /.. ///," //* / / / / .// ///1I,/ /.' / I i / / / , / k,/ / t =' //f / i°4I1 -"riz/// /./ / / r - -//,//////..4-1 / / r // Peter Dolman reflects on a day in the workshop and the huge efforts required to set it up in an old farm outbuilding Inever did like Mondays much. Don't misunderstand me, I love this job. Honestly! It's just that as I get older I seem to enjoy other things too, like dawdling over breakfast and gazing at the birds in the garden. But on days such as this one, when I might be guilty of arriving at the workshop a couple of minutes late, you can bet I will be caught out by an early bird of the human type. A Kenwood CD player In this case it was the demure Miss Crisp, who was waiting with her brother Everard. She batted her eyelids and spoke to him in a minus 90dB whisper, while edging a Kenwood DP7030 CD player into my arms. "It's that CD" Everard bellowed on her behalf, "he's gone crackerdisc or summat. Phone 'er when 'er's done." Then they were gone. Once peace had returned I decided that, as fortune favours the brave, I might just take a look at it. When I removed the cover I found an audiophile product of superb build quality. I inserted a disc, which immediately spun anticlockwise at great speed. After watching and wondering, I decided that a check on the balanced supply rails would be a logical starting point. So, in the absence of a service manual, I began to check the DC conditions at the many regulator transistors present. There are two large PCBs, one at each side The premises of Dolman Electronics, converted from a milking parlour of the mechanism. As I probed the one on the right-hand side the problem disappeared, never to return! Undaunted, I removed the PCB and studied its underside. Link W27, near the front end of a long copper bus bar, appeared to be dry -jointed. So, to prove the point, I unsoldered it and powered the unit. To my immense pleasure the symptom had reappeared, and could be made to come and go by unmaking and making the link. I finished off the repair by cleaning the pick-up lens, and put on a nostalgia test CD. As comforting sounds emanated from the workshop audio system, I took in my surroundings and recalled a time, several years ago, when things weren't looking anything like as rosy for us... Flashback My heart sank as I walked through the building that was to become our new workshop. It wasn't quite as I remembered it nine months previously when, filled with naïve enthusiasm, I had first visualised it as a state of the art service department with my name outside. I had for some years been trying to find a new home with potentially useful outbuildings. Then, in the early spring of 1990, this little farm came on the market. It was situated within a few miles of the workshop I rented at the time, which meant that I would be able to preserve links with my established customer base. Once we had seen the place we had fallen for it and had felt as if it was, somehow, our destiny to live and work there. Maybe, if we sold everything we possessed and mortgaged ourselves to the hilt, we might be able to buy it. Now, still reeling from the combined effects of juggling bridging loans, solicitors, banks and estate agents, with the need to continue running a business from the current workshop, I found myself standing in a cheerless milking parlour, taking in the reality of its uneven flooring, frameless doorways and unglazed windows, which complemented the scene by introducing an icy chill. The rubber -clad mains wiring looped across the woodworm -infested roof timbers was damper than I recalled during my swift springtime evaluation. To have the building renovated professionally was out of the question. The well -meant guesstimates provided by enthusiastic friends and customers in pre -ownership days turned out to be hopelessly optimistic. While I grimly contemplated the unplanned expense of retaining my old workshop and the impossibility of the new situation, my thoughts turned to taking counsel with Seiior Mick, who worked 'on the building' as they say... Back to the present The sound of a car door slamming jerked me back to the present. A large gent in a chalky -looking boiler suit was making a grand entrance complete with an incredibly dusty Toshiba 2505DB. On setting it down he stared intently at Dear Heart then down at himself. "Look at the state of me" he exclaimed, giving the set a sideways glance. He proceeded to slap himself vigorously, until the plaster dust that had come from his hallway covered the contents of the workshop and its occupants. Then he turned his attention to the fault. "Dunno what it is" he explained, shaking his head sadly. "He's got a short picture on BBC but he's all liney on the ITV, like. I dunno what it is..." As he continued his detailed appraisal, I 288 March 2004 TELEVISION found my mind once more beginning to drift back to the memory of times past, to my workshop renovation problems and the man we got to know as Senor Mick... Senor Mick After much tea drinking and tooth sucking Senor Mick had made his proposal. "You'll just have to do it yourself' he concluded with a grin. Despite my protestations that I wouldn't be handy with anything heavier than a soldering iron, he devised a plan of action for us. Each weekend he would visit us and issue instructions for the coming week's activities. We had to obey them to the letter. Each weekday I would have to work on AV repairs, then in the evening toil on the conversion of my ice chamber until exhaustion took over. Come the following weekend Sefior Mick would reappear, appraise my efforts and issue fresh commands. Eventually, if I stuck at it, all would be ready for a weekend transfer of the stock and repairs between the workshops. Inspired by the prospect, I set up accounts with builders' merchants, who perplexed me by querying everything that Seilor Mick had specified, and electrical suppliers who didn't. I hired a pneumatic drill, and invested in heaps of gravel whenever directed, even buying a handsome cement mixer to coerce him to sort out the damp, uneven floors. He in turn produced metal -clad security doors which I fitted upside down. After observing my feeble attempts at puttying, he suggested employing a glazier to make the place bearable to work in. Best of all, I somehow managed to persuade my wonderful brother-in-law Richard and his son Robert to sacrifice six months' worth of weekend leisure and instead spend them on the delights of endless timber sawing, worm -proofing, plasterboarding and painting, rewarding them with nothing more than tea and Chinese takeaways. Gradually the place had taken shape. As summer approached,'it neared completion. Fully rewired, the benches built, night -storage heating installed, doors fitted correctly, secure and lockable. The great moving weekend arrived... The Toe-sheba problem I started as Dear Heart sweetly brought me back to reality - by digging me savagely in the ribs. Her way of reminding me of our precious productivity, which was going out of the window while I was taking my trip down memory lane. The man in the boiler suit was still in full swing. "So when can I pick up the Toesheba then? It can't be much. Nothing in 'em nowadays, and my missus says she saw down at Tesco..." Glancing at the clock, I decided to bring his spiel to a close by promising to attend to the repair the moment he left. Seconds later I was vacuuming out his set, then took a look at the conditions inside. These sets commonly suffer from field scan problems. This one was no exception. Full scanning was restored by replacing C372 (2.2i4F) and C317 (111F). But further tests revealed the presence of field foldover when the set was first switched on, provided the received transmission at the time was in 4:3 format. If a letterbox programme happened to be selected, there was no sign of the foldover! The culprit was C313 (220/4F) in the flyback boost circuit. An Aiwa audio centre The next job that required attention was an Aiwa MX3300M 3 -disc CD player and twin cassette plus receiver, housed in twin enclosures. None of the front buttons functioned, and there was no display. Fortunately I'd come across this before. In many Aiwa models a voltage -doubling arrangement is used to provide a -32V supply to bias the filament of the fluorescent display. It employs two electrolytic capacitors that tend to dry up, extinguishing the display. In this particular model the supply also feeds pin 71, which is marked VFDP, of the display control IC. Without this supply the front buttons also become inoperative! Having sorted that out I passed the equipment to technician Dear Heart for a CD changer mechanism clean and general TLC overhaul. Brewing us a nice cuppa, I continued to reflect on the days that saw the last lap of our workshop relocation. The relocation You might think that it would be quite a challenge to clear and transfer the contents of a workshop when you've been in it for over ten years. In fact I hadn't really A corner of the workshop thought about that side of the relocation. Surely it would be easy compared with what we had already achieved? But, in addition to over a hundred repairs, there were stock sets, test gear, benches and so on to shift. Although we kept on removing vanloads of the stuff our old workshop, seemingly miffed at no longer being at the centre of our working lives, stubbornly refused to look any emptier - until two full days of effort on our part had drawn to an end. We finally took down the aerial array and set off with it sticking up out of the sun roof of the company Cavalier Estate, young Robert in the passenger seat being in sole charge of gripping and twirling it. This was much to the amusement of the whole village, who had turned up for the annual fete and thought we were part of the entertainment! So far as our customers were concerned we had simply closed one workshop on a Friday and opened a new one on the following Monday. Even our telephone number hadn't changed, so it must have appeared quite seamless. The new workshop took some getting used to, and is still being improved and upgraded. Like all of us trying to make a living in this trade, Dear Heart and myself have seen the products we work on evolve while their owners' attitudes have also changed. One policy that has helped has been to set up a professional relationship with various manufacturers as their authorised service centre. In conclusion we would like to thank Television for being such a mainstay for this trade, and hope to be able to invite you to join us for more days in the life of our workshop.. March 2004 TELEVISION 289 DX and Satellite Reception Terrestrial DX and satellite TV reception reports. Broadcast, satellite and digital TV news. Could Bluetooth be an interference problem? The early days of ITV. Roger Bunney reports Test card from a local UHF station received by Hugh Cocks in the Algarve. ecember 2003 was a poor month for DX reception. The only Dreports of mid -winter Sporadic E activity were of reception from TVE (Spain) on the 1 1 th - Madrid ch. E2, Izana (Canary Is) ch. E3 and an unidentified ch. E4 station. There was a tropospheric lift on the 4/5th, reported by Cyril Willis (King's Lynn), with Band III reception from ARD (Germany) in chs. E6, 7, 9 and 11, RTL (Luxembourg) ch. E7 and Canal Plus (France) in chs. L5, 6 and 9. TE (transequatorial skip) reception has now fizzled out in the Algarve, where Hugh Cocks reports that many new UHF transmitters are opening in Morocco, particularly for the RTM-2 network. It's time to review briefly the year that has just drawn to an end. Noteworthy were the excellent SpE activity during the summer, and the incredible record that was established with Band II FM reception in Ireland and Northern England from stations along the US Eastern seaboard. The distances involved suggest either extreme double -hop or even triple -hop SpE. There were also many instances of Band I reception from the Middle East in the UK. After a relatively good year, let's keep our fingers crossed for an even better 2004. There's still a question over the closure of the Spanish VHF TV network. A listing (see news section) suggests that this occurred at the end of October, but Hugh Cocks in Portugal reports that Madrid ch. E2 and Izana ch. E3 were still on air just prior to Christmas. RTP (Portugal) also continued to transmit in ch. E3. Satellite sightings On Christmas Eve the CNN Newsource feed via NSS-7 (21.5°W) at 11.563GHz H (SR 6,117, FEC 3/4) carried for some hours a locked -off' camera shot of downtown Los Angeles, courtesy of KTLA-TV. The significance of this is not known: possibly either a follow-on from the Californian earthquake a few days previously or the prevented terrorist hijacking of an Air France plane bound for LA. There was happier news from Iraq earlier, during the afternoon of Christmas Eve, when talk -show host David Letterman appeared at a GI base in Baghdad. At the end of the news item (NTSC) the reporter gave several dozen outwords, each with a different TV station or network: these end voiceovers would then be edited on to the main item for the relevant TV station. This was via Eutelsat W2 (16°E) at 12.540GHz H (5,632, 3/4), with an unusual service identification - 523209. Christmas Day produced many of the traditional OB offerings, including the Pope at the Vatican and many regional services. For example ZDF DSNG-2 ZU uplinked a morning carol concert via Eutelsat WI (10°E) at 11.063GHz V (6,109, 3/4). The Tellytrack, a South African horse -racing service via Europe*Star-1 (45°E), has moved slightly to 11.497GHz V (3,253, 7/8): on Christmas afternoon it was running videotaped documentaries on racing folk and promoting holiday race meetings, including many UK ones on Boxing Day. When I checked on Boxing Day I found that Tellytrack featured a single South African race meeting plus live UK meets at Wincanton, Wetherby and Wolverhampton. I recall working on Boxing Day OBs at Wincanton years ago, and still shudder at the many weather variations in just a few hours on that bleak hillside! But bad news was seldom far away during 2003. On Christmas Day the US military HQ in Iraq was hit by missiles: CBS ran two NTSC uplinks from Baghdad via Eutelsat W2 to provide latest news for those back home. CBS is based at the Rimal Hotel in central Baghdad, the outward uplinks being at 12.548 and 12.566GHz H (5,632, 3/4). The first hop is to London, then New York: the incoming reverse programme sound (IFB) from NY also passes via London, as became evident when the Baghdad crew tried to speak to NY. On the late afternoon of Christmas Day a suicide bomber struck in Tel Aviv, bringing fresh carnage. UP4 (APTN) fed initial live pictures via Euteslat W1 at 10.973GHz V (4,167, 5/6), with a second feed via W2 at 12.533GHz H (5,632, 3/4). The pictures via both satellites were sourced from RR Satellite, an Israeli - 2 9 0 March 2004 TELEVISION based satellite -linking facility. The bomber had blown himself up at a bus stop, killing three Israelis. The aftermath pictures were graphic and tragic. Hardly the season of peace and goodwill to all men. While checking W1 on the afternoon of December 20 I found fuzzy black -and -white pictures from a helicopter/aircraft tracking an Arab dhow. Figures could be seen throwing sacks into the sea: those aboard were aware of impending arrest and shortly afterwards armed marines boarded the dhow and took over. It subsequently transpired that the boat had been involved in drug running in the North Arabian Gulf and carried a large quantity of heroin. Sections of this footage were later shown by Sky News. The original feed from the Gulf via a news provider, possibly APTN, was at 10.967GHz V (4,167, 5/6). Earlier that day the same frequency had carried an unusual two -channel multiplex, VIA 1 and VIA 2, which consisted of Spanish -language reports transmitted simultaneously from a military location, possibly in Baghdad, with the reporters only feet from each other. I've no idea of the source or destination. The only clue (?) I obtained was a 'NET ident in the RSD receiver's 'information' analysis menu. In mid -December the Old Bailey jury brought in its guilty verdict after the long Sohan murder trial. Not unexpectedly there was considerable media interest. Sky News fed reports from the pavement outside the court via Eutelsat W2 at 12.525GHz H (5,632, 3/4). Anglia TV used the TES -42 satellite truck to provide a live insert from its reporter, based outside Sohan Church, for the evening news magazine programme at 1800 hours. At the house, still fenced and boarded up, where the murder had occurred another TV crew operated a Jimmy -jib to give the camera a view. Throughout the original searches, then the arrests, the same Anglia reporter had been on site. TES -42 downlinks via Telecom 2D (8°W) at 12.601GHz H (5,632, 3/4). Edmund Spencer bade farewell to the TV7 Tunisia analogue downlink via Eutelsat W2 at 11596GHz V. He reports that a new Albanian TV multiplex has appeared via this satellite, at 11-449GHz H (14,000, 3/4). In early December the multiplex was FTA but subsequently adopted Irdeto encryption for all but a promotional channel. Interesting that on December 8 the latter carried Premiership football (Leeds v. Chelsea) with an Albanian -language commentary. Finally Alan Richards (Nottingham) noted that on December 14 the Clarke Belt was full of Saddam capture reports. Broadcasters from 1°W to 16°E carried the news. Clear MPEG-2 returned to Eutelsat W3 (7°E), with EBU Baghdad on two paths plus Poland POL 25 IRAK. There were at least five reports via W1 at one time with a further three via W2. Broadcast news Spain: Information received from the Benelux BDXC suggests that the Spanish (TVE) VHF transmitters were due to close down on October 31, with Navacerrada (Madrid) ch. E2 moving to ch. E26, Aitana (Alicente) ch. E3 moving to ch. E63, Izana (Canary Is) ch. E3 moving to ch. E42, Santiago (Coruna) ch. E4 moving to ch. E53, Guadalcanal (Seville) ch. E4 moving to ch. E43 and Sollube (Bilbao) ch. E4 moving to ch. E26. But Hugh Cocks (Algrave) says that Madrid ch. E2 and Izana ch. E3 at any rate were still on air on December 23. UK: The Isle of Wight RSL station Solent TV (ch. 54 H) has installed a new transmitter at Rowridge and now uses the full allocated 2kW ERP. There has been a noticeable improvement in the received picture quality - here at Romsey, Hants it is noise -free. The previous franchisee TV 12 apparently used a lower ERP. A year into the new franchise and Solent TV has made remarkable progress, with local programming and internet content. Check at the Solent TV website. The station is run on a non-profit, community -orientated basis, unlike most other RSLs. Southampton TV on chs. 29 and 55 is getting increased adver- tising support but has suggested in the local press that it would consider offers for its Portsmouth and Southampton stations. Iraq: The Iraqi Media Network, which provides TV and radio services, is to be rebuilt. Contracts are currently on offer. The services have proved to be unpopular with Iraqis. Canada: CTV is now producing CTV-East, an HDTV channel for cable distribution nationally. CTV-East programming is also transmitted by CFTO-TV (Toronto), with either true HD content or material upconverted to a compatible HD format. Zimbabwe: On December 1 ZBC started a new national channel, National TV (NTV), transmitting from Bulawayo in various local ethnic languages. The main national channel ZBC-1 transmits from the Harare studio with mainly English -language programming. Digital TV news French DTT transmissions are expected to start by the end of March next year with a minimum of fifteen national and regional FTA channels plus fifteen pay -TV channels. S. Korea has still not decided whether to adopt the DVB or ATSC DTT standard. The Maltese government is keen to adopt DTT and is waiting for the telecom authority to confirm suitable frequencies. About 25 DTT licences have been issued to local stations in eastern and central Japan - the official start of DTT was on December 1. National broadcasters NHK and Fuji are transmitting DTT but take-up is slow and coverage across Japan is expected to take some years to complete. The government hopes to end analogue transmissions by 2011. A 600m broadcasting DXer's SPECIAL 14" TV Direct channel entry/readout Direct frequency entry SPECIAL OFFER 40-860MHz Muitistandard NOW ONLY 1111299f2:409.000. Overnight delivery by insured courier V 2.00 Low noise tuner . 12v DC and mains operation S Remote control Il Scarf connection Auto scanning of RF channels Auto scanning of frequencies 40-860MHz II Cable tuner Video squelch (removed in tuning mode) Six teletexts M Covers systems BG/I/LL/DKK PAL and SECAM, NTSC via the scarf FREE BBC VIEWING IN EUROPE Perfect reception only with the latest THOMSON digi box 12 volt SKY MINIBOX Now Available 41111 The correct digi box + the correct dish + the current LNB = perfect reception anywhere Watch the BBC wherever you like, in Europe etc Digital satellite systems from only £399.00 All dish systems are supplied with LNB, cable and plug You canreceive FREE viewing of BBC1.2.3.4. children's BBC, BBC24 hour news and all the BBC radio stations plus many more ITV1, Channels 4 and 5 available for a one off Fnacyrmeasenet yarranged bs),(zeouwrsi elves oeuursr new enhanced imported LNBs Tripods £49.95 Digital system with 88cm dish - £438.95 with 1.1m dish - £478.95 ALL PRICES INC VAT Overnight delivery in the UK for all items by insured courier £12.00 FULLY COMPREHENSIVE 35 PAGE CATALOGUE AVAILABLE BY RETURN OF POST FOR 21.50 AERIAL TECHNIQUES LTD Tel: 01202.423555 Fax: 01202-425055 59 Watcombe Road, Southbourne, Bournemouth, Dorset BH6 3LX, UK E-mail: [email protected] www.aerial-techniques.com Est 1979 Callers by Appointment please 5 - - ----- E7 1. March 2004 TELEVISION 291 'G9AED I WINTER NIL EXPERIMENTAL SITE TELEVISION MAP 5E.E.. SIGNAL. 34;660149 INC WATT UNE IS TO SNOW UP . DELAYED IMAGES CHANNEL 9 (GHOSTS) WHIN HAT APPEAR THE, WALK WHITE STRIPS. VISION 194.7S MO SOUND THE DOTS F.NABLE. AN ESTIMATE Of THE. MEI DISTANCES 191 ').S Pkju TO Br MADE The Belling Lee G9AED experimental test card transmitted at Winter Hill in early 1956. tower is to be constructed in Tokyo, carrying six TV networks plus radio services. Taiwan hopes to start DTI' transmissions prior to 2008, because mainland China aims to start DTT transmissions in time for the 2008 Olympic Games. The Taiwan government has decreed that cable systems must be fully digital by 2006. Cable networks are concerned about the cost of set -top boxes and the fact that the government has still not decided whether to use the DVB or the ATSC standard. Satellite news Eutelsat 2F3 (21.5°E) has in recent months entered an extreme inclined orbit. Even ITN OB links are having problems maintaining signal lock back to the studio. Lyngsat has ceased listing OB/news feeds via this satellite at its website. A multitude of satellite news channels are operational or planned for the Middle East. Saudi Arabia was due to open a news channel in February, carrying Arabic and international news. Saudi TV opened a sports channel last autumn. The Al-Arabiya TV offices in Iraq have been searched by US forces and a transmission ban has been imposed. But an offshoot, Middle East News, continues to operate from premises in Dubai. The Middle East Broadcasting Centre offices in Dubai have also been searched. CBC/Radio Canada is to start a satellite national radio service covering the whole country, financed by subscriptions. French and English -language services will be transmitted. Inevitably the footprint will cover much of the US. Bluetooth A reader asks whether Bluetooth could interfere with satellite reception. This seems unlikely: Bluetooth operates at 2.42.48GHz with low powers. It's a short-range radio link for voice or data communication, operating at 1mW for up to 10m though a 'medium -range' option increases the range to 100m. I found a great deal of information on the system at the Ericsson website. The problem seems to be more with interference to Bluetooth: because of this it uses various techniques to provide high-level protection from interference and also data security. The system can be used on a master -slave basis to form `piconets'. It is also possible for piconets to be linked in a network called a scatternet. Bluetooth is a form of radio LAN (Local Area Network) whose main aim is to link equipment without the need for extensive cabling. Go to the Ericsson website for further information. The early days of ITV Television, previously Practical Television (the change occurred between the September/October 1970 issues), has chronicled the advances in TV reception, receiver design and broadcasting since 1950. Last summer Bill Wright of Wright's Aerials got in touch with me to ask if I had any old catalogues etc. relating to the early days of ITV, particularly Band III aerials and ITV convert- ers, for inclusion in his website: http//www.wrightsaerials.tv/albertsatticgallery.htm It's well worth a look! Fortunately I have retained all my copies of the magazine back to 1959, and have obtained previous copies going back to 1955 at jumble sales and when readers have kindly offered them when moving etc. So Bill's Band III requirements were soon sorted out. But I continued to muse over 405 lines and times past! ITA Croydon ch. 9 opened on September 22 1955, using a 200ft mast (a new 500ft mast was erected in 1962). It was followed by the Litchfield (Midlands) ch. 8 transmitter on February 17 1956. As the ITA network spread during the late Fifties, aerial manufacturer Belling Lee usually appeared at future transmitter sites with its temporary test transmitter G9AED, operating at 1 kW peak white with a four folded -dipole aerial atop an 85ft lattice mast, to enable early trade test assessments to be carried out. G9AED certainly appeared at the Croydon, Lichfield, Winter Hill and Chillerton Down sites and possibly others. I'm not certain when the exercise ended. The spread of the ITA network closely followed the earlier route of BBC TV. The January 1950 issue of Practical Wireless/Television described the London -Birmingham TV link to Sutton Coldfield (ch. 4). The Post Office contracted out the multi -hop circuit to GEC in May 1947, following six months of research. The north -bound FM TV links operated at 870 and 890Mc/s, with simultaneous south -bound feed capacity at 917 and 937Mc/s (Mc/s in those days!). From the Museum Telephone Exchange at Howland Street, London, the BBC hopped four times to reach the Newhill Street phone exchange in Birmingham. Compare this with the "new Southern Television link" described in the November 1958 issue of Practical Television, with just two 4GHz hops from Museum to Golden Pot (Alton) and a further hop to Chillerton Down, a total of 83 miles. This was followed by a 2GHz link to the Southampton PO (18 miles) and a coaxial feed down to the Plaza, Northam. All links worked two-way simultaneously. In those days the pages of Practical Television were full of advertisements for Band III aerials and ITV converters, both fully built and DIY kits. Turret tuners were produced by Brayhead and Cyldon amongst others. Companies that have long gone included Spencer West and Fringevision. Others, who included Labgear which then produced preamplifiers and TV interference filters, are still with us today. These filters were necessary because many ITV converters simply provided an output on one of the Band I channels, so a filter was required to prevent breakthrough of the local BBC channel on to the new ITV programme. In November 1958 there was an article in Practical Television on BBC widescreen TV tests, using an aspect ratio of 7:4 (very similar to the 16:9 45 years later). Back in 1955 B.L. Morley wrote a TV DX series in Practical Television. Interesting transmitter listings included Paris operating with 441 and 819 lines, Eindhoven (Holland) ch. E 1 A with the video at 47.75Mc/s and the audio at 53.75Mc/s, and Lopik ch. E4. Karel Kiesel (Belgium) wrote in the January 1950 issue of Practical Wireless that Eidhoven is really perfect using an indoor half -wave dipole without a reflector! He was awaiting a government decision whether to adopt 405 or 625 lines. Things have changed in the DXing world! Finally, has anyone any information on C Aerials of Croydon, whose Band III aerials resembled a fish skeleton, and Dale Aerials which made the Band III Dale Parabolic reflector aerial (eight reflectors on a curved boom with a single dipole at the focal point) -a later Mark 2 version used a corner -reflector? The Dale aerials were around in the early Sixties and were popular with aerial riggers in very hilly locations where signal scattering was experienced. An intact C aerial is still present at a house near St. Lukes, Guildford. 292 March 2004 TELEVISION Campion Electronics Ltd. SUPPLIERS OF QUALITY EX -RENTAL TV'S and video equipment to independent retailers across the UK and EIRE. 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Nilv From phones to cameras. home cinema systems to DVD players. Panasonic brings ideas to life. If you service or repair any of our products. we can make your life easier too. thanks to the new Panasonic Spares Direct website. Specially developed for smaller companies who only need parts or advice occasionally but still want genuine discounts on guaranteed spare parts it's now open for business. Register on the subscription -based site now and for just £24 for a year's access you'll find the most competitive prices. online technical information and repair manuals, special offers and immediate part number identification. It's fast. it's easy. it's trouble -free and it's the only place you need to visit when you need to service or repair any Panasonic product. So why call us for spares when you can now visit us 24 hours a day? Visit www panasonic-spares-direct co uk for more information. Panasonic Panasonic CS UK Willoughby Road, Bracknell. Berkshire. RG12 8FP www.panasonic-spares-direct.co.uk TELEVISION March 2004 293 AUDIO FAULTS Reports from Chris Bowers Dave Gough Mike Leach Geoff Darby and Philip Rosbottom We welcome fault reports from readers - payment for each fault is made after publication. Reports can be sent by post to: Television Magazine Fault Reports, Highbury Business Communications, Nexus House, Azalea Drive, Swanley, Kent BR8 8HU or e -mailed to: [email protected] Sony STR-DB840 This unit didn't power up. A look round inside showed that the power transformer's connector CNP805 on board DC (2) required attention - the unit came to life when it was moved. A quick clean up restored normal operation. C.B. Sony CDP101 This old-timer was a first -generation player, released in the early Eighties and at the time very expensive. It's powerful, with a brilliant transport system and Aston Martin build quality, also remote control. The years take their toll however and things can go wrong, though not a lot. A common fault is failure of the drawer to open on command: the unit goes through the motions but that's all. Remove the lid and observe the drawer slides/guides. On close inspection you will see a small silver lever at the right side rear of the drawer's right -side rail. It should move back to allow the drawer to release, and reverse to lock the drawer in when closed. To gain access to the lever for service you have to remove the player's bottom cover. The lever will seem to be almost seized. Remove the circlip, detach the pull -back spring and spray a small amount of release agent on the pole, then pull the lever off gently. Twenty years of use and heat will have hardened the grease to a cement -like substance. A good clean and regrease solves the problem. All grease points in a machine of this age will probably need similar attention. But it's great to work on such class gear, and owners don't mind paying. D.G. Yamaha A09 This amplifier was brought in because it was dead. After removing the cover I found that fuse Fl (1.6A) was black. Meter checks then confirmed suspicions that bridge rectifier diodes D601/2 (1N5402) were short-circuit. Once replacements had been fitted and further checks had been carried out all was found to be well and the unit powered up and worked correctly. D.G. Sony CDP-CX235 The reported fault was failure to play CDs: the unit would load a disc but not play it. I found that a disc wouldn't spin because there was no focus or sled movement. So I tried one of my usual tests in this situation: I moved the laser manually to the outside of the disc and switched on again to see if the laser returned to the beginning. It didn't. Heating board BD produced some results. Application of freezer stopped operation again. Inspection of the board revealed some very poor looking soldering to the CXD2587Q digital signal processor chip. A reflow of the solder around this chip restored normal operation without need for IC replacement. The machine was returned to the customer after several days on soak test and never came back. M.L. Kenwood DPR28 The owner's complaint with this carousel type five -CD player was that "when five discs are on the turntable they stop short of the position where they are picked up to be played". This seemed to be a very precise description and, as the owner is a police officer, one I was inclined to believe - though a part of me was sceptical. In fact the unit always played correctly with one or two disks loaded, but the carousel positioning became unreliable with three discs loaded. With four discs it became iffy, and with five downright erratic. As more weight went on the carousel the motor seemed to labour, which suggested that there might be a power -supply problem. The unit is part of a stacking system and is fed with low -voltage AC from the amplifier unit via the bus cable. It contains rectifiers, smoothing capacitors and regulators. I soon discovered that the problem corrected itself when the PCB was pressed in the vicinity of these devices. To get the PCB out to examine its underside is no mean feat. The tray has to be removed from the changer assembly to gain access to two of its securing screws. Many connectors have to be unhitched, including more than enough of those dreadful stiff -wire 'snatch' types. Once the board had been removed I was able to home straight in on C501, where there was a whopping cracked -all-round dry -joint at the positive leg. While the board was out I decided to give it a good examination, using my headband magnifier. An alarming number of iffy joints were to be seen, many of which were fully cracked. A few years ago I would have spotted them at a hundred paces with the naked eye! A blanket resolder, followed by refitting the board and tray, provided a complete cure. G.D. Sony HCD-H1600 This old-timer led me a merry dance. When it was powered a loud hum, unaffected by the setting of the volume control, came from the speakers. Scope checks in the power supply showed that there was huge ripple on the +12V rail and a lesser amount on the -12V rail. My ESR meter quickly proved that all was not well with C285 (4,700/4F, 16V), the reservoir capacitor for the +12V supply. C286 (2,200/4F, 25V), the reservoir capacitor for the -12V supply, read OK even though the scope had shown that there was considerable ripple at its negative terminal. 294 March 2004 TELEVISION There was a sizzling sound when I applied my soldering iron to C285's joints, and my nose was assaulted by the immediately -recognisable smell of fuming electrolyte. When the capacitor had been removed I saw that it had indeed leaked. Several tracks pass under the capacitor, and there are through -plated holes nearby. The tracks had been stripped of their solder resist and looked very dull. There were no signs of distress in the vicinity of C286 when it had been removed, but I decided to fit a replacement before reassembling the unit. I cleaned the leaked electrolyte from the tracks carefully, and spent some time with a strong light, magnifier and an Avometer set to the ohms range to see how much damage had been done. It was clear that the negative terminal of C285 and the positive terminal of C286 were no longer connected together or to chassis. I reinstated these connections using fine, insulated etch -revision wire. As there didn't seem to be any other problems I fitted new capacitors and, confidently, switched on. I was rewarded with a loud hum! Out came the board again, then the two new capacitors. After a lot more Avo checks I found a through -plated hole that links an area of earth print on the top of the board to an area underneath. The reading between these two earth areas was about 1k52. Bridging the hole restored good bonding between the two earth areas, so the new capacitors went back in and the board was refitted. Guess what? When I switched on I was greeted with a gentle hum, which this time was affected by the setting of the volume control. Further scope checks showed that there was now no excessive ripple on any of the supplies, so I began to look at what I had done during the course of the repair. When I had restored the connection between the two capacitors and from there to chassis I had picked a point, which was conveniently marked `Gnd', at one of the board's connectors to terminate my rework wire. This point had read perfectly to chassis, and had clearly restored a good earth connection to the capacitors, because the ripple across them had disappeared. In view of the fact that since fitting this wire I had found another problem, in the form of the bad through -plated hole that had now been bridged, I decided to disconnect my added wire and see if the capacitors still had good connections to chassis. They did! So I removed the wire completely, then switched on. This time there was silence! A final check on all functions showed that the unit now worked correctly in every respect. G.D. Luxman L309 There was no output from this 75W amplifier, another classic from the Seventies. Each power amplifier plugs into the main board - great idea! I found that the driver and output transistors were all short-circuit. The driver transistors are T066 types that are not available, so I replaced them with TO220 transistors obtained from RS. Cut down (to TO220) heatsinks were fitted to the transistors as without a heatsink they run hot. The output transistors were replaced using MJ15015/16 pairs. P.R. Technics RS630T This cassette deck was running the tape at high speed. It seemed that either the capstan motor's speed regulation had been lost or the take-up reel was pulling the tape too fast. I found that the spring had come off the pinch wheel. Refitting it cured the fault - after a struggle to keep the spring in position while slipping the wheel over the pivot! P.R. Sony TA-E77ES This high -end preamplifier's phono socket outer connections were being lost - they were working loose as a result of plugging/unplugging. The top row of the sockets can be held by soldering a length of braiding along the line of the spigots at the back of the sockets. As the unit also produced spurious howling/oscillations, the braid was continued to earth points on the chassis. The case of the volume control was also earthed. The chassis is made of polymer resin, which could account for these problems. P.R. Test Case 495 The Test Case workshop covers a large geographical area that includes coastal, urban and rural locations. There are many differences between them, not so much with respect to customers' equipment of course but the customers themselves, the signal -reception conditions - and the reliability of the mains supply! In country districts power is often supplied via overhead lines and, especially in winter, can be subject to cuts, brown -outs and surges. Something of the sort had occurred in the region of Northfield, because phone calls and duff equipment were coming in from that neck of the woods. Amongst the sets there was a Sony TV Model KVX2928U (BE3B chassis). It was totally dead, with its mains fuse blown and the big STR-S6708 chopper chip IC600 short-circuit between pins 1 and 2. Real Technician ordered a replacement, also a new current sampling resistor (R605, 0.2752) as the one in the set looked somewhat stressed. When they arrived and were fitted the set showed some signs of life -the standby LED glowed for example - but there was another problem of some sort. When the set was brought out of standby there was a quick burst of energy, complete with the rustle of EHT, after which the set reverted to standby. How often have you cleared one fault only to be confronted with another one? What does it do for your estimate or quote and your morale?! Real Technician connected his oscilloscope across the HT (135V) reservoir capacitor on the secondary side of the chopper circuit. When he switched the set on again he saw that the volt - age rose to almost 140V in the split second before it shut down. The over -voltage protection circuit must be coming into operation he decided. Now optocouplers, especially when they are used for voltage -regulation feedback in a power supply, can be unreliable devices. There is one here, IC600, and RT found that there was a new one in the stores. In it went but, naturally, it made no difference to the fault symptom! RT's beady eye next alighted on the regulation circuitry associated with IC601. He saw a three-legged device, IC602, that was labelled 'error amplifier'. Maybe it was one of those so-called variable zener diode thingys, which can also give trouble. There wasn't one in the stores, so an order went off to Sony pronto. The set then sat on the shelf for a couple of days before the device arrived and was fitted. How did you guess? It made no difference! RT, becoming a little desperate, turned his attention to the primary side of the power supply. He found a transistor here, Q601, that was marked '7V regulator' on the circuit diagram but 'soft start' in the service manual's block diagram. Maybe the telly wasn't starting softly enough? In went a replacement and, for good measure, the 6.8V zener diode (D603) in its base circuit was also replaced. In for a penny, in for a pound, thought RT as he fitted replacement electrolytic capacitors in the nearby positions C604 and C605. But the set continued to revert to standby immediately after switch -on. Had RT started off on the wrong foot? Was the fault in the power supply at all? For the solution, turn to page 315. March 2004 TELEVISION 295 Extended fault reports Reports on complex or tricky TV fault conditions are sometimes too long for inclusion in our regular fault-finding section. We've put a few of them together in this extended fault report feature Reports from Mike Leach and Denis Foley Sony KV32LS35U (FE2 chassis) This monster Sony set was another head banger that came my way recently. The symptoms were very unusual. When the set was switched on it produced a plain white raster, with no sound or scart switching and no sign of snow via the tuner. It would not respond to remote -control commands, though the LED flashed when a remote -control button was pressed. It obviously knew that something was happening but was unable to process this. The workshop was very busy at the time so, after a quick assessment, an EEPROM chip was ordered. This seemed to be a logical first step. When the new chip arrived I fitted it and found that the symptoms hadn't changed but the picture settings had. Obviously the new EEPROM was blank. This affected the picture size, so it was clear that the control system was at least partially working and that the EEPROM's settings were being processed. I blew the dust off the oscilloscope and set about trying to find out what was going on. Clock and data pulses were present at the microcontroller chip and looked OK as far as one can reasonably tell. Nevertheless I decided to disconnect the clock and data lines at the various controlled devices in the chassis to see if any corruption was taking place. The tuner was disconnected first, then the multisound processor chip. There was no difference in either case and not much left to check, so I went back to the microcontroller chip. Further checks in the control area led me to believe that this chip had to be faulty. A replacement was ordered and subsequently fitted. Lo and behold, no difference! I had already spoken to Sony technical to discuss the fact that in some of these sets the microcontroller chip has no reset, the reset IC being absent. I don't know if one had ever been fitted in this case, but was told that some earlier sets do have a reset IC and later ones don't. In this set the reset pin (64) appeared to be connected to chassis. This had confused me - I had spent some time looking for a short-circuit that wasn't there! A second call to Sony produced the answer. After some ten minutes' discussion, making scope checks at the same time, it was suggested that I try pressing the TV button on the remote -control unit the one that takes you out of the teletext mode and is highlighted as a square box. I pressed it and the graphics came up. There was picture snow and all the remote -control functions worked. When I picked myself up off the workshop floor and retrieved the swinging telephone handset, before it came back and hit me on the head, the very nice chap at Sony told me that the set must somehow have entered the ageing mode. This is entered by keying TTO7 in the service mode, and produces the very symptoms I had thought to be a fault. Pressing the TV button exits this mode, returning the set to normal. As the original EEPROM had all the customer's settings stored in it I refitted it. The 'fault' symptoms were then back. The EEPROM had remembered the ageing mode, and the TV button had to be pressed again to produce a picture. After that everything was OK. I wondered whether the original micro controller chip had caused all this to happen, as both EEPROMs produced the effect. They had both been connected to the original microcontroller chip before a replacement had been fitted. Maybe, . maybe not! I also keep thinking to myself that of all the remote -control buttons I had pressed during diagnosis and testing I had never once pressed the TV button. If I had done so I might have cured the 'fault' without knowing why! Many thanks to Sony technical. M.L. Sanyo CE28FWN3-B (EB6-C28 chassis) This set was in and out of the workshop several times before the cause of the fault was discovered. It would come in with drastically reduced height and very poor trapezium settings. A new EEPROM had been fitted and the receiver had been set up, but it still came back with the same problem. Not having a Sanyo agency, we didn't appreciate how badly the trapezium adjustment can be affected when there's a field fault in this chassis. Several other engineers (thank you Graham at PVS) advised me to look for a field fault rather than concentrate on the memory/control section. The set sat on the rack for several days before being switched on. When powered it produced a good picture, but the height decreased very slowly over a period of about six hours. The following morning it was only slightly better, and no external heat or freezing had any effect. Basically, once it had gone into the fault condition it March 2004 TELEVISION Figure 1: The protection circuit in the Philips G110 chassis acts on the chopper power would take several days to right itself if it wasn't switched on. Don't you supply via the feedback optocoupler IC7614. Various sensing circuits are connected to the transistor latch Tr7655/6 just love 'em! I left the set for a week 32V D6592 30V D6561 47V D6591 o LOPT pin 2 D6560 0 EW drive circuit then hooked a scope to IC7614 the field output chip's CNX83A 32V 0 drive pin and switched it on. After about four -five hours the waveform was 16Vo D6657 20V IL4 680n slowly becoming smaller. The drive waveform comes from pin 26 of the 220 jungle chip IC201, which is type TB1251CN obviously a Sanyo spe- 470k Tr7591 680 BC858 D6590 43V 100k 20k 33n LOPT pin 7 (beam current sensing) cial. I got the same results with the scope connected 47k 14V to this pin - low drive. 82n 0 There was a scrap chassis in the workshop, so I took Regulation drive its jungle chip and fitted Tr7654 this in the present patient. BC817 Tr7656 BC857 5k6 680 Audio 1k2 output stage 27k Tr7284 sensing BC858 A full field then filled the screen, topping up my Tr7655 BC847 47k 82n confidence no end. Anyone else had trouble with this chip? M.L. and the correct version must be used as there was a dim raster, but no luminance Sony KV29LS3OU the replacement - be warned! M.L. or colour. While I was trying to find the This 29in. set's line output transistor was short-circuit. I ordered and fitted the transistor kit (part no. 994801441) and the Philips G110 chassis with Nicam cause of this latest condition the set, after about twenty minutes, again went into the protection mode. new transistor failed at switch on. This is The initial fault with this set was a short- Further checks on the items I had not uncommon: it usually means that the circuit BU508AF line output transistor already replaced got me nowhere. This line output transformer (part no. (Tr7545). When I fitted a replacement the time I had to look farther afield, to the 145330831) has failed. So I fitted a set worked for about five seconds after Nicam stereo section. This circuitry is replacement and was rewarded with a which there were two loud cracks because shown in diagram E in the service manu- blank raster. of excessive EHT. This was enough to al: the previous components had all been I moved a little uneasily on my ageing destroy the line output transistor again. in diagram B, power supply and deflec- bench stool, as I knew I was in for a Examination of C2548 (8.2nF, 3kV) in the tion. There's a further protection circuit lengthy repair and had assured the cus- diode modulator circuit showed that it had for the audio output section, with another tomer that his set would be ready later a bulge in its side. BC858 transistor, Tr7284. It was also that day. Sound was present, also the on- So C2548 was replaced and another leaky emitter -to -collector. A replacement screen graphics, but there was no picture. BU508AF was fitted. I then had a totally restored normal power -supply operation. Teletext worked, except that the red was dead set with no LED illumination. When I now had a set that would remain on missing. The LED at the front of the set I disconnected the supply to the line out- long enough to trace the cause of the final flashed several times, I can't remember put stage and connected a dummy load in fault (no picture). When I connected a how many - my mind was concentrated its place the HT was correct at about scart lead to my monitor it produced a on replacing the microcontroller etc. chip, 148V. So the power supply hadn't been normal picture. There were video inputs which in this chassis is an 'ultimate one damaged. Fortunately I had a line output at pins 21,22 and 25 of the TDA8390 chip' device (or UOC). It does just about transformer in stock, but installing it got luminance/chroma processor chip everything known to man, but the replace- me no farther forward. IC7350, but no RGB outputs at pins 13, ment didn't cure my problem! Well it did, I've had problems previously when try- 17 and 15. Voltage checks around this IC slightly: it cured the no red in the teletext ing to find the cause of faults in the pro- revealed a high at pin 9, about 5V if my mode, that was all. tection circuitry see Figure. 1 in these memory is correct, instead of a low of I turned my attention to the beam -lim- sets. It wasn't going to be easy this time OV. This pin controls the switching iting (ABL) circuit, which is connected to either! The Wickman fuse F1534 in the between external RGB inputs to the IC the UOC chip, and found a total of three EW drive circuit was OK. So were zener and decoded off -air signals. Temporarily surface -mounted diodes that were all diodes D6561, D6590 and D6592, which shorting pin 9 to chassis produced the OV either leaky or short-circuit: D021, D505 are used to sense various conditions. that was required for normal off -air and D507. Replacement of these finally Eventually I got round to checking tran- reception. I now had normal reception, restored normal operation, some ten days sistor Tr7591 (BC858) in the beam -cur- and decided to leave it at that! after the initial promise . . . rent sensing circuit. It was leaky emitter - "Why go to so much trouble with an These UOC chips are actually quite to -collector. Once a replacement had been old set?" I hear you ask. Well, I have pro- reliable, though they do tend to fail big fitted the power supply started to work, as vided an annual service contract with this time when there has been a major failure did the line output stage. There was set since it was new. It seemed only fair to in the line output stage. When ordering a sound, but where was the picture? the customer that I should try my best to replacement, always check the IC's mask When I advanced the setting of the Al get her set working when it had given so version. There have been several updates, control on the line output transformer little trouble over the years. D.F. TELEVISION March 2004 297 TV FAULT Reports from Michael Dranfield Philip Salkeld UeI Harte Arthur Jackson Jerry Fedorak L. Gare John Evans and Philip Laws We welcome fault reports from readers - payment for each fault is made after publication. Reports can be sent by post to: Television Magazine Fault Reports, Highbury Business Communications, Nexus House, Azalea Drive, Swanley, Kent BR8 8HU or e -mailed to: [email protected] FINDING Goodmans GTV34R3 Stuck in standby, with the power supply running but no line drive, is a problem I've come across on several occasions with various different sets that use this chassis. The cause is always an invisible dry -joint at the little blue resonator between C20 and C24 near the STV2102B jungle chip. There's no circuit reference number for the resonator on the PCB. M.D. Tatung T14TK7OL (L series chassis) This newish set produced a bright white raster with flyback lines. I carried out some checks on the CRT base panel and found that safety resistor R24 (2252) was open -circuit. The associated electrolytic capacitor C6 (22pF, 250V) had a bulging top. So I replaced these items and switched on again. R24 immediately blew, though there was no short-circuit at its output side. I then noticed that D607 (BYT42G) on the main board was charred, while capacitor C621 (10pF, 250V) had burst its top open. Replacements (R24, D607 and C621) restored normal operation. It would appear that D607 had been the basic cause of the fault. M.D. Ferguson TX807 chassis The dealer who brought this set in said that the 24V zener diode DP27 went short-circuit at switch -on. As DP27 is connected in series with the start-up resistors I found this difficult to believe. But he was right. I couldn't find any faults on the primary side of the power supply but noticed that DP90 (RGPIOD) on the secondary side had been replaced. A BY133 had been used, and the board beneath it was discoloured. I replaced DP90 with the correct type, also DP27, and confidently switched the set on. Once again DP27 went short-circuit. Now DP90 is the rectifier for the supply to the audio output stage. I figured that if this had been the original cause of the problem the safety resistor RP90 (0.2252) may have been damaged. In fact it was open -circuit. I concluded that the power supply will not run correctly unless fully loaded. M.D. Daewoo IR14A5 This 14in. set had a big burn up in the power supply. R806 (10052) and R807 (2.4k52) were both burnt to a crisp, R804 (0.5652) was open -circuit, and the snubber capacitor C806 (470pF, 2kV) was split down the centre. I suspect that this capacitor had failed initially, leading to all the other damage. If so the STRS5707 chopper chip 1801 would also have been damaged. I replaced this item as well and, when I switched the set on again, it fired up first time. M.D. Philips 21PT1664/05S (SL9.2E chassis) Sound but no picture was the complaint with this set, i.e. there was no raster. When I removed the back I saw that the CRT's heaters were alight. So I adjusted the Al supply control on the line output transformer, fully expecting to see the field -collapse symptom. But there was no change. A check on the Al supply at the tube produced a reading of about 20V. The control was open -circuit. Replacement of the line output transformer, part no. 4822 1401 0669, was the answer. I seem to recall that the same problem used to occur with an older Philips chassis. P.S. Tatung T14RF71 (F series chassis) This set appeared to be in standby, but the HT output from the power supply was pulsing between 50V and 105V. Disconnecting the power supply outputs made no difference to the symptoms, so I started to carry out component checks in the power supply. This led me to C809 (100pF, 250V) which was open -circuit. A replacement restored the set to full operation. P.S. Bush WS6674 This widescreen set was stuck in standby. With this type of fault I generally check the HT supply at the collector of the line output transistor first. It read 100V and was decaying, which was strange to say the least. The power supply produces an HT output of 145V, which is fed to pin 2 of the line output transformer. It was pres- 2 98 March 2004 TELEVISION ent and correct. Pin 1 of the transformer feeds the line output transistor. A piece.of glue was stuck on pin 1, making it high resistance. All that was needed to put matters right was to resolder pin 1. P.S. Toshiba 3387DB (C8SS chassis) This set's green LED was flashing. When I noticed that the CRT was a Philips one I figured that it was the cause of the fault. A tap on the neck of the tube verified this. When the replacement came it was a Thomson type, which is fitted with different scan coils. A phone call to Toshiba spares revealed that a kit, part no. 23013117, is required. The replacement was straightforward but, when the set was switched on, there was trapezium distortion. I read the instructions again and found that the two leads in the two -pin plug that goes from the CRT base panel to the scan coils have to be interchanged. Doing this cured the problem. All this work because the original Philips tube is no longer available! P.S. Sony KV28LS35U (FE2 chassis) This set was dead. A good place to start is the BU2515DX-127 line output transistor Q533, which was short-circuit. The part no. is 872904908. When I fitted a replacement the set was still dead, with the front LED flashing twice. According to the manual this means that there is an excess -current problem. I dived into the excess -current network and eventually came to R618 (270k0, 0.5W) which had gone high in value. A replacement restored normal operation. I have to say that Sony sets are not the best to work on. P.S. Hitachi C2556TN This set belongs to a neighbour, who knocked on my door and said that it kept stopping and starting. When I walked into the room and saw the model my immediate thoughts were of dry -joints at the usual LT regulators, especially when I tried tapping the set. But this wasn't the cause. The offending dry -joint was revealed only when I removed the plastic frame from the PCB. The HT preset VR950 was the culprit. Two weeks after that I had another set in which VR950 was dry -jointed. P.S. Akai TV2111TGB The fault symptoms with this set were cramped field scanning and inability to tune in channels. I wondered whether the two faults were related -a supply rail problem perhaps? As I didn't have a service manual I phoned my friend Tom in Cookstown NI. He suggested a check on the 33V zener diode D14 and the 47pF, 25V capacitor C26. Both turned out to be leaky. U.H. Daewoo DWX28W5GB (CP885 chassis) I had two of these sets, both new stock, that reverted to standby intermittently. The cause of the problem was the connection between the line output transistor and the transformer. Close inspection revealed a high -resistance here. U.H. Dansai 9313A The initial fault was failure to revert to standby correctly. This set led me a merry dance. I found that transistor Q506 (2N5401) was leaky, and a replacement seemed to cure the fault. A day later Q506 failed again. A check on the HT output from the power supply then revealed that it was high at 127V instead of 108V. Adjusting the preset made no difference. The cause of the problem turned out to be C809 on the primary side of the power supply. U.H. Daewoo GB2OHIT The complaint with this set was sound distortion when warm. I ran the set for two hours before the fault put in an appearance. Then, by using freezer spray, I found that the cause was C620 (100pF, 25V). It was leaky. U.H. Grundig ST55-734 (CUC2121 chassis)) The problem with this set was very intermittent field collapse. It was not a difficult fault: coil L53021 next to the field output IC was dry -jointed. U.H. Philips 32PW6332 (MD1.2E chassis) This chassis is used in several 25, 28 and 32in. models. We've had a problem several times with them, the symptoms being a dead set with the mains fuse blown and two or more of diodes D6510-6513 in the mains bridge rectifier network short-circuit. Cold checks usually fail to reveal any other shorts. In this case the thing to do is to remove C2544 (2.2nF, 2kV) in the snubber network, inspect it and check for leakage. A burnt pinhole is often evident, together with a slight leak. If this item is not checked a replacement fuse and diodes will usually blow instantly at switch on. The part no. for the capacitor is 4822 126 13451. A.J. Grundig GT1402 (G1000 chassis) There was no sound from this 14in. set. Checks around the audio output chip IC550 showed that the 9V supply at pin 2 was missing. The cause was simply that the series resistor R560 (4.70 safety) was open -circuit. There were no other component faults, but the soldering was poor in all areas and the speaker leads had not been trimmed and appeared to touch where they came through the PCB. I replaced R560, resoldered as necessary and trimmed the speaker wires. A.J. Sharp 51DT25H (CA1 chassis) The fault report said that the sound pulsed on and off and the picture took ten minutes to appear. This was a useful and accurate description. Checks showed that there was excessive ripple on the +10V rail, because C712 (220µF, 16V) was virtually open -circuit. All the other capacitors in this area were perfect. A.J. Philips 25PT4523 (MD1.2E chassis) This set's power supply was tripping rapidly. Initial checks showed that the outputs at all the rectifier diodes on the secondary side of the power supply were low. A lot of time was spent checking out the high -power stages, but the cause of the problem turned out to be a short across the +5V standby rail. When attention was turned to the small -signal panel I found that the Aquadag wire and spring were jammed across it, because the plastic clip on the tube had snapped. The microcontroller chip IC7600 and the EEPROM chip IC7685 had both been damaged. I had to repair the Aquadag cable and replace both chips. A.J. Hitachi C28WD2TN This set would run for a few minutes then produce a loud plop from the speakers and go dead. The cause was very poor joints at the 5V regulator IC951 (L7805CP). It's becoming a common problem with this range of Hitachi sets. A.J. Philips 28PW6305 (Al OE chassis) No remote -control operation with this chassis is commonly caused by the micro controller chip IC7064. We have had two cases recently however where the cause was the infra -red receiver IC6009, which seems to go open -circuit. The part no. is 9322 127 54667. A.J. Matsui 1496T This set was tripping (ticking noise). On inspection I found that C576 was dry jointed. I decided to check the BUH515D line output transistor Q580 and found that it was leaky. Resoldering and a new line output transistor restored the set to life, with a good picture. J.F. March 2004 TELEVISION 299 Philips 28PW6332/05 (MD1.2E chassis) When this 28in. set was switched on it produced a vertical line straight down the centre of the screen for a second. Line collapse followed by switch off presumably. There's a ribbon cable that goes from the line output stage to a PCB above the scan coils. On inspection I found a dry -joint here. To be on the safe side I resoldered all the connections. This time there was a good picture when the set was switched on. J.F. Zanusi 26ZA374GB (Telaid BS665 chassis) When the customer phoned and said her Zanussi had gone off I thought she must be referring to a washing machine. But no, when I called round there was a Zanussi TV set. When I switched it on there was a line whistle. Cold checks showed that the BU2508AX line output transistor was leaky. All was well once a replacement had been fitted. J.F. Beko 12220NX The customer said there was a crackle with Nicam sound when the set had warmed up. The 17.472MHz crystal Q4 on the Nicam board was faulty. L.G. Alba 4859 (11AK19 chassis) The picture would go but came back when the panel was flexed. I found that there were poor connections between B701 and pin 22 (beam -current limiting) of the jungle chip IC401. L.G. B&O 3119 MX2000 RL25 (10kQ), which is connected to pin 5 of the line output transformer, was burnt. When I fitted a replacement transformer and resistor there was a weak/dim picture. CL24 was then found to be shortcircuit. L.G. Philips 24PW6322/05 (MD1.2E AA chassis) This set was dead (no results) with the red LED flashing. Cold checks in the power supply showed that the STH8NA6OFI chopper FET was short-circuit. I replaced it, also the MC44603P control chip IC7520, but when I switched on there was a tripping noise and smoke came from the 1nF, 2kV blue disc capacitor C2433 in the line output stage. It's connected between the collectors of the two parallel line output transistors and chassis. I fitted a replacement capacitor and checked other components in the line output stage. All appeared to be well here and when I switched on there was a good picture. J.E. Bush 7690D This monster integrated -digital widescreen set is fitted with the 11AK19 chassis. The reported fault was no picture, just lines. What this meant was a blank raster with flyback lines - the sound was OK. Checks on the CRT base panel revealed that R914 (47Q fusible) was open -circuit, because the TDA6108JF RGB output chip IC901 was faulty. A normal picture was displayed once these two items had been replaced. R914 is quite well hidden between IC901's heatsink and the white -coloured connector next to it. J.E. Schneider STV2802T The customer said there was no picture and a cracking noise. When I removed the back and switched on, violent arcing was seen at the top of the line output transformer. I would advise against fitting an HR8320 as a replacement as adjustment to the adjacent heatsink will be required for access to the focus control. In this situation you will often find that the S2055N line output transistor has blown. Even if it seems to be OK I recommend fitting a replacement. While you are at it, check IC401 for dry -joints. It's mounted against the rear of the heatsink mentioned above. The original line output transformer is available from CPC under order code TI-P13T40680. J.E. Matsui 20TN (Tatung D4N chassis) There was no audio and no OSD, just black panels with no text. This fault is caused by the XL24CO4P EEPROM chip. When you have fitted a replacement it will be necessary to retune the set, reset the user controls and adjust the picture height and linearity. To do this enter the service mode by shorting out PL701, which is next to the microcontroller chip. Use the remote -control unit's P+ and Pbuttons to step through the program and the vol+ and vol- buttons to alter settings. Store new settings by pressing the Clear button (stored will show at the top of the screen). To leave the service mode remove the shorting link. J.E. Panasonic TX32PK3 (Euro-4 chassis) This set would come on for about six seconds then revert to standby. During its on time the EHT rustle could be heard and, if the Al control was advanced, a faint blank raster could be seen. I checked the various protection lines and found that the voltage at pin 71 (Vprot) of the main microcontroller chip IC1101was low. This led me to the VDP chip IC601, where the field flyback pulse was missing at pin 11. As full scanning was possible, I traced back along the pulse path and came to chip capacitor C454 (220nF) which was open circuit. P.L. Philips 25PT482 (GR2.2 AA chassis) The fault report said "goes off'. Once the usual dry -joints around the line output transformer had been attended to the set remained on. While it was being soak tested however the picture occasionally faded to snow. The tuner wasn't sensitive to tapping, but I managed to make some voltage measurements with the set in the fault condition. These showed that the tuner's AGC voltage had fallen from a nominal 6V to zero. I traced the source back to the large IF module, where it was the only voltage that varied. Inspection here, with a magnifier, revealed a cracked joint at R3013, which supplies bias to pin 10 of the IF chip. Resoldering this joint provided a lasting cure. I subsequently had another Philips set that was fitted with a similar IF module and had the same fault. P.L. Panasonic TX14S1T (Z5 chassis) The symptoms with this set were dead with a twittering power supply. Voltage checks showed that all outputs from the power supply were low. I decided to disconnect the HT feed to the line output stage and fit a dummy load instead -a 60W bulb. The power supply would then sometimes run normally. There was nothing obviously wrong with the line output stage, so I reconnected its supply. To my surprise the set then sprang to life, with the bulb I had forgotten to disconnect glowing merrily! How could this be? After disconnecting/connecting the bulb a few times and discounting thoughts of under -load protection I turned my attention to the primary side of the power supply, where R821 (330k0) was open -circuit. P.L. Bush 1441 (Grundig G1000 chassis) The picture's height was reduced, it was shifted to the left and was very weak with a poor grey scale. All that was necessary was to set up the RGB outputs and the picture geometry, using the service menu. To do this, switch the set on while holding the prog + and - buttons on the set. Then select the item to be adjusted with the remote -control unit's menu button and adjust it with the handset's prog + and - buttons. When finished, press the TV button to store the new settings. P.L. 300 March 2004 TELEVISION VCR CLINIC Reports from Bob Flynn Gary Laidler Peter Tennant George Cooper and Dean Ratcliffe We welcome fault reports from readers - payment for each fault is made after publication. Reports can be sent by post to: Television Magazine Fault Reports, Highbury Business Communications, Nexus House, Azalea Drive, Swanley, Kent BR8 8HU or e -mailed to: [email protected] Panasonic NVF70 (G deck) Although this machine played perfectly there was an annoying clunk every few seconds. When I looked at the underneath of the deck while it was playing I saw that the clutch disc (item 116) was vibrating in coincidence with the noise. It shouldn't move at all in the play mode. The cause was revealed when I removed the centre pulley unit (item 137): its lowest small gear had come adrift as a result of a crack in the main body. A new centre pulley unit cured the fault. B.F. Bush VCR840VP (Aiwa TN6500 mechanism) When a tape was played the sound was OK but the TV picture remained on! The only possible clue to the cause of this weird fault was that there would be slight interference on the E -to -E picture when a tape was inserted. As getting to the power circuit is a lengthy process I decided to replace all nine capacitors on the secondary side. This cured the fault. When I checked them afterwards it seemed that C821 (1,000pF, 16V) had probably been the cause. B.F. up from time to time. The cause of the fault was easily traced to connector PJ201, which connects the CTL head to the main board. The poor joints looked as though they had been present from new. G.L. JVC HRD455 If you get one of these old machines that won't accept tapes, replace both cassette switches to cure the problem. P.T. Sanyo VHR899 This VCR was dead with the fuse in the plug open -circuit. I thought it was going to be an easy job, but not so. When I tested the machine I found that it was very slow at loading tapes. It turned out that the loading motor was the cause. All was well after fitting a replacement followed by a general clean and test. P.T. Hitachi VTM930E This machine was completely dead. I discovered that R851 (1Q, 0.5W fusible) in the power supply was open -circuit. It's not shown on my circuit diagram. G.C. Panasonic NVF70 (G deck) The E -to -E picture had severe patterning. The playback picture also had severe patterning but in addition was in black and white. Replacing C22 (680pF, 10V) inside the power supply cured the fault. It's a problem I have not had before. B.F. Bush VCR906SIL-T5 When a tape was inserted this machine went into a sluggish fast -forward. After about five seconds it would power down with ERR in the clock display. Puzzling symptoms, but the cure was simple: give the mode switch a good clean. It's mounted on the bottom panel. G.L. Toshiba V703 The problem with this VCR was tape chewing, the cause being the rotor. Once this had been dealt with the picture had a flicker and was mistracking. I decided to scope the outputs from the power supply and, sure enough, ripple was present. The culprits were the 15pF ad 47pF electrolytics on the stand-up subpanel. G.L. Panasonic NVSD200 This VCR wouldn't accept a tape and a chattering noise came from the loading motor area. It was not the loading coupling or the main lever this time but the gear worm wheel, part no. VDC7466, which was a bit toothless. It's available from SEME at 55p. G.L. Sanyo VHR244E The complaint with this machine was that it would cut off seconds after going into the record mode. Playback was OK. PR512 again I thought, but couldn't have been more wrong: when I removed the top cover I found that it's an earlier model that does not have PR512. As I powered up the machine to take voltage readings I detected a horrid smell that came from the power supply section. You have to remove the main PCB and take off a large metal screening can just to be able to see the power supply. A quick visual inspection revealed that C5107 (47pF, 25V) had leaked badly. It was the source of the smell and had corroded the following adjacent components: C5106 (47µF, 50V), C1501 1,000pF, 16V) and D5114 (1SS244). I removed the damaged components, cleaned the board and fitted replacements. After that the machine worked flawlessly. G.C. Toshiba V825B This machine was dead with no signs of life. The cause was C835 (820pF, 16V) in the power supply. G.C. Panasonic NVSD220 There were no functions with this machine, a tape was stuck in it and there was no E -E operation. The cause was loss of the 5V supply at Q1003. A 2SD1330 or 2SD1996 is used in this position. D.R. Proline VR515 This fairly new VCR suffered from intermittent loss of tracking and would speed JVC HRD960 If the display is dim, check or replace C28 and C29. D.R. March 2004 TELEVISION 301 DVD Fault reports from Chris Bowers Geoff Darby and Mike Leach We welcome fault reports from readers - payment for each fault is made after publication. Reports can be sent by post to: Television Magazine Fault Reports, Highbury Business Communications, Nexus House, Azalea Drive, Swanley, Kent BR8 8HU or e -mailed to: [email protected] comb set in a plastic frame. The 'teeth' had been subjected to a knock at some time. This had put a dent in them, drawing several of the conductors very close together at that point. So close in fact that two were just about touching. You could instigate the noise by literally blowing on the connector. After disconnecting power from the player I was able to straighten the conductors easily by slipping a scalpel blade down between them and twisting it until separation was restored. This action provided a complete cure. G.D. Sony DVP-CX860 The fault with this unit was intermittent no power -on. Checks inside revealed that C301 (680pF) was faulty. To cure the intermittent failure the replacement should be 1,500pF, part no. 1-137-921-11. C.B. Sony DAV-S880/HCD-S880 When this unit was tuned to a station broadcasting RDS information the registered station's name would disappear. The cause of the problem was microprocessor IC901 on the DVD board. A replacement, type sPD703033BYGF-M31-3BA, part no. 6-803-244-01, restored the missing station names with RDS. C.B. Sony DAV-S550/HCD-5550 There was no operation with this DVD unit - it was stuck in the protection mode after a mains power blackout. I'd had this fault before with an HCD-S880. All that was required was to check on the power board, where the cause was confirmed as being C921 (2,200pF, 35V). A replacement restored normal operation. C.B. Sony DVP-NS330 The complaint with this DVD player was "makes a background noise with all discs". There didn't seem to be a problem at first, so I left it running for a while then removed the top cover to have a probe around. There was an odd rustle from the sound when the MPEG board was pressed, and the stereo 'spatial' feel changed. At first I thought that this was going to be a real nasty, such as a bad through -plated hole or a poor joint at one of the several 100+ pin ICs. More careful prodding led me to connector CN601 however. It connects the MPEG board to the main board, and is an uninsulated open -wire affair - those with children will understand the description that it looks like the teeth of a metal nit Sony PlayStation 2 We have two of these at home. They've never given any trouble, so I have not previously had cause to look inside one. This unit had arrived in a bundle of other items from an engineer who specialises in TV and video - he tends to leave his HiFi and DVD repairs to me. The owners had been using the machine for normal DVD playback as well as for games. According to them it ceased to read discs after they had had some particularly dusty building work done. The unit proved to be very easy to take apart: remove six screws from underneath, four covered with clip -in plastic blinds and two with rubber feet. The DVD deck has its own plastic cover, which is secured by four very small Phillips screws. Once the cover has been removed the whole deck is in plain view, including the laser, as the disc clamp is part of the cover. The deck, and the laser lens in particular, was very dusty. So I set about carrying out a full clean and relubrication. The laser unit is of a type I had not seen before, so I had no experience as to whether a clean was going to be enough. Once the unit had been reassembled however both game -play and regular DVDs were read faultlessly. A long soak test proved that this reading was reliable. G.D. Hitachi DV-P325E This machine was completely dead, with nothing alight in the display. Checks on the secondary side of the power supply showed that there was a short across the 9V output, between the cathode of D1030 and chassis. The diode and its reservoir capacitor C1035 were both OK, the culprit being D1048, which is a zener diode. Replacement of the diode is not easy: you have to remove the front of the machine to gain access to the PCB to unsolder it. Now maybe I missed something here, but getting the front off with the disc tray loaded is almost impossible. You end up with numerous removed screws and a pile of bits they wouldn't be able to piece back together on the Krypton Factor in two hours, let alone two minutes! Things got better however when, after replacing the diode, the machine powered up in its stripped -down state. All was then well. M.L. 302 March 2004 TELEVISION What a Lovely Pair! HORIZON DIGITAL TERItSTRIAL METER HDTM Signal Strength and BER displayed together Pre and post BER displayed on sub menu 10 pre programmed transmitters (via website) or all channel step through Audible tune -in, with back light 7 or 8 MHz channels 2K and 8K mode Automatic Transmission and constlation VHF (band3) and UHF bands RF input range 167-862 MHz Input dynamic range -72dBm-20dBm Input connector BNC. Input imp75 ohms. Loop through External power for mast amplifiers, etc. Built in universal charger 80-250 V Ac. Intelligent charger (CE approved) with delta V delta T detection. Fast charge, then Trickle Run time with full charge: Minimum 5 hours from 2.5 Ah battery Figure of 8 mains input connector. 2.1 mm Female PSU plug for external charge via supplied car charger Computer interface: Serial port (Corn 1-4) for upgradeable software on transmitters. HORIZON DIGITAL SATELLITE METER HDSMV2 Signal Strength and BER displayed together 32 Transponders or 16 satellites, horizontal Sc vertical Audible tune -in, with back light DVB, C&Ku band, Mpeg, V Sat compatible Input dynamic range -65dBm--25dBm Input connector F -female. Input imp 75 ohms Symbol Frequency rate from 1 Msps-45Msps Universal charger 80 V - 250 V Ac. Intelligent Charger (CE approved) with delta V delta T detection Fast charge, then Trickle Run time with full charge (single LNB): Minimum 3 hours from 2.4Ah battery Figure of 8 mains input connector. 2.1 mm Female PSU plug for external charge via car charger LNB short circuit protection 500 mA automatic limiter RF input range 950- 2150 MHz Computer interface: Serial Port (COM 1,2,3 or 4) for upgradeable software on satellite settings. salescerhorizonhge.com on +44 (0)20 8281 3777 /ryi For a reliable solution! lr# DUKW&I RIreeplaanirds AO' SKY DIGIBOX TRADE REPAIR SERVICE FOR THE UK & EIRE Are you looking for a reliable company to repair your sky digiboxes? We offer FREE SAMEDAY Collection when you send more than one box for repair! PRICES For 1 box Pace. Grundig. Amstrad Fixed price £38 + VAT includes return delivery Panasonic. Sony Fixed price £55 + VAT includes return delivery For more than 1 box e.g 2 X Pace £76 + VAT includes Collection & return delivery PRICES INCLUDE ALL FAULTS MICRO PROCESSOR. MODEM. SOFTWARE CORRUPTION AND BGA REPLACEMENT SPECIALISTS IN THE REPAIR OF PANASONIC TU DSB 30 ( modification for BBC and ITV low band problem ) REFURBISHED DIGIBOXES FOR SALE. IDEAL FOR USE WITH NEXT GENERATION CARD WITH NO SUBSCRIPTION TO PAY (BBC, ITV, CHANNELS 4 & 5) (6 months warranty + new remote and accessories) FAST TURNAROUND TIME ALL REPAIRS GUARANTEED COLLECTION ARRANGED FROM ANYWHERE IN THE UNITED KINGDOM AND EIRE AUTHORISED SKY DIGITAL REPAIR CENTRE. Receive our latest Satellite and technical newsletter FREE through email. Just send us an email with Newsletter in the Subject title to: [email protected] Contact: DIGI REPAIRS (UK & Ireland) UNIT 25, ENNISKILLEN BUSINESS CENTRE TEMPO ROAD, ENNISKILLEN BT74 4RL TEL NO: 02866327293 (NATIONAL RATE) 0845 6441628 (LOCAL RATE) FROM R.O.I. 0486 632 7293 Email: [email protected] TELEVISION March 2004 Pho:av randata Ltd itor of ireless Hands free Solution Wartka laullaty cow' Nceitn, witt2du agcy ctizi@blOco Ipltacorx NC) vliratrvilv kiv.r thvc:afrskactl GVC) Seiye) AC) httN(1.1taihm CAD 109v wilavdsktat apoldrufpguotary 40 yoaax amoonDatv 631p Woo witlaraft&,&II twaa c7 Ct® yomx gh<s)a54) nom your rowdy lo dalwo c7DQA bDttli Otivowl.i ow 111`.9 ,tabltiengt lyttoco.1 Order Code : FREEDOMTALK Price : 25.50 + vat coca ®ma' Cr369ffizt® ffiG77C4711 fto w000l ADcialtD0 C)EsGusJ Hoilatil) a 0011Z a ftao t0 0 tGann o tualiaraity Visatibliw a a ILM) MD Rivas/A TM: ONO) t4)00 2t2:1 Fast (332(1)) 39 A3 faant10 tEtha<c;[email protected] 30 Send letters to "Television", Highbury Business Communications, Nexus House, Azalea Drive, Swanley, Kent, BR8 8HU or e-mail [email protected] using subject heading 'Television Letters'. Please send plain text messages. Do NOT send attachments. Be sure to type your full name, address, postcode, telephone and e-mail address (if any). Your address and telephone number will not be published but your e-mail address will unless you state otherwise. Picture quality Back in 1996 you published a letter from me commenting on the poor picture quality with many TV programmes because of standards conversion from 525 -line NTSC sources. Have things improved now that we are in the 21st century? Apparently not. Digital TV produces unnatural -looking, low -definition pictures with clearly visible pixellation effects where there is movement. Films and other material that starts off on 35mm film is now electronically processed, the end result looking like a long -play VHS recording minus the noise. Thirty years ago I worked for a national rental company, installing TV sets fitted with the then new Philips G8 chassis. Given a good signal, the pictures these sets produced were superb. Today's digital picture quality would have meant an instant service call from most viewers in 1974! DVD players sounded promising at first, but the ones I've seen all give poor - quality, low -definition pictures, presumably because of bandwidth limitations. Once the present analogue transmissions have been switched off, will there be any way in which we can view good quality TV pictures in our own homes? Martin McCluskey, Bishop Auckland, Co. Durham. TV downleads I must congratulate Bill Wright for his excellent article on television downleads in the January issue. For many years `Wizzo' aerial installers have been reluctant to use high -quality downleads with TV aerials to save costs. I well remember the days of cracked aerial insulators, caused by ice during cold weather: one would get the odd Snoddies customer phoning to report "water coming out of the back of the telly". The cause was mainly failure to prevent water ingress by say a little mastic around the open feeder. Water could also trickle down in the space between the sheath and the screen. As a result the copper braid would turn green and eventually disintegrate. This produced severe mismatching and a poor signal at the TV input. Happy days! Ron Bravery. Sent by email. After reading Bill Wright's article (January) on coaxial cable quality I was motivated to replace some of my cable runs - I live in a fringe area where the signal levels are very low. In my experience the effect of corrosion, particularly with the coaxial braiding, can be very detrimental to signal levels. As most braiding is copper, and most connections are to steel or aluminium, there is inevitably electrolytic action between the metals in the presence of moisture. I found that one or two cable runs had a DC loop resistance of 500 over 10m! Cleaning all connections and smearing them with WD40 reduced the readings to less than 20, greatly improving reception. The same applies to the aerial connections, and the connections to any other devices installed externally, but access can be a problem. Fortunately mine are all in the loft, so I was able to overhaul everything. Loft installation carries the penalty of reduced signal strength and other difficulties, but there is no wind damage and corrosion is greatly reduced. So if loft installation is possible the equipment will be virtually everlasting. D.K. Yeomans, Angmering, West Sussex. HELP WANTED The help wanted column is intended to assist readers who require a part, circuit etc not generally available. Requests are published at the discretion of the editor. Send them to the editorial department or email to [email protected]:n Wanted: Mode switch for the Hitachi VCR Model VT130E. Laurie Jones, 56 Southridge Rise, Crowborough, East Sussex, TN6 1LQ. Phone 01892 654 867 Wanted: A number of encoder/decoder chips type 4M3750. Peter Ward, Petgra, Forest Corner, Ringwood, Hants, BH24 3JW. Phone 01425 475 445 Wanted/for sale: Require a power supply panel for the Tandberg Model CTV2-6133, new if possible or from an existing set. This 26in. model with remote control was top of the CTV2 range. Have for sale a Tandberg Model CTV1 and a new A56 540X tube. S. Mann, 12 Levens Way, Silverdale, Carnforth, Lancashire, LA5 OTG. Phone/fax 01542 701 431 Wanted: A diagram (photocopy OK) to enable me to index the cams and gears in a Sony VCR Model SLV-F900UX. Also require a TMP47C410AN controller chip for a Toshiba microwave oven. Rod Proctor, 8A Maliston Road, Great Sankey, Warrington, WAS 1JR. Phone 01925 635 582 or 07931 913 726 Wanted/for disposal: Require a service manual for the Canon Model FAX-B200SBHT04063 fax/copier machine. Have for disposal free to a good home RF output valves type TT22 (7738Z) for a Sailor marine transmitter/receiver. Steve Roberts, Fasgadh, Marine Place, Mallaig, Inverness-shire, PH41 4RD. Phone/fax 01687 462 189 For disposal: Copies of Television from 1975-2003, U -View circuit books, manuals, spare parts and test equipment. Phone David Miles on 0151 932 1419 Wanted: Scan D assembly (PCB) for a Pioneer 50in. plasma screen. Other markings are AWZ6229 and ANP1892-B. Or alternatively a scan -drive IC type SN755862PJA. Phone Jeff on 0113 268 6412 or email [email protected] For disposal: TVs of yesteryear, free to collector. National Model TC85; Bush colour sets, one fitted with the T20 chassis and the other with the Z718 chassis; Sony Model KV1820; and a Ferguson monochrome portable fitted with the 1690 chassis. Michael Dranfield, 6 Calesdale Close, Buxton, Derbyshire, SK17 9RH. Phone (daytime) 01298 73 989 or email [email protected] Wanted: A graphics driver for a Patriot PC Model PBC X 366/1. The graphics is an onboard type (integrated graphics) via PC100. The machine crashed and I have no driver software for it. The device manager has set it for 16 colours (640 x 480). Can anyone tell me which driver to download and where to download it from? Please email any information or suggestions, however small, to [email protected] 304 March 2004 TELEVISION MONITORS Fault reports from Gerry Mumford George Cooper Bob Bradley and Ian Field We welcome fault reports from readers - payment for each fault is made after publication. Reports can be sent by post to: Television Magazine Fault Reports, Highbury Business Communications, Nexus House, Azalea Drive, Swanley, Kent BR8 8HU or e -mailed to: [email protected] Dynamode Apart from the name Dynamode at the front there was no indication of the origin of this LCD -based flat -screen monitor, though there was an obvious slight indentation at the rear where a sticker should have been but had fallen off. The unit, which was completely dead, incorporates a mains power supply in its base. Only the base had to be stripped down to repair it, which was very convenient. The power supply uses quite an unusual circuit that's based on the IM0280R chopper IC. Tests showed that the start-up voltage was very low, because the decoupling capacitor C6 (100nF, 63V) was leaky. Once a replacement had been fitted the unit powered up and produced a first-class display. G.M. NEC MultiSync EP1370 This very large, natural -flat CRT monitor powered up, but with just an amber LED and a quiet, rhythmic buzzing sound from within. A fairly major strip -down was required to gain access to the panels. Checks then showed that the 2SC5453 line output transistor Q561 was very leaky while the 2SJ569 B+ regulator FET Q5G1 was short-circuit. Replacement of these two devices restored normal opertion, with a superb -quality display. G.M. Proview 772M The customer complained that this monitor would switch off intermittently. When I tried it on the bench it came on and stayed on. Twisting the PCB made it cut off however. There were quite a few dry -looking joints, but resoldering didn't help. I eventually found that the 10k52 HT preset VR501 was faulty - the merest touch on the slider made the power die. A replacement followed by a long soak test with much twisting of the PCB proved that all was now well. G.C. Compaq V570 The customer said that the fault with this 15in. monitor was excessive brightness. The symptom was present when I powered the monitor, so I set about stripping it down. I've not had the problem before with this model. The fault had also affected the spot -suppression circuit, as there was a small, faint phosphor burn at the centre of the screen, caused by an excessively bright spot at switch -off. I noticed, without having a circuit diagram to work with, a row of high value resistors to the rear of the line output transformer. So I checked these and found that R521 (3301M) was open -circuit. It's in series with D504, to which reverse bias from a line output transformer pin is applied. D504 provides a high negative voltage for the brightness circuit. Replacement of the 3301(52 resistor cured the fault, but the customer was not too happy when the phosphor burn was pointed out to him. The damage had of course been done before the monitor arrived in the workshop. B.B. Elonex MN024 There were a couple of these Acer-made monitors (F6Y version) on the scrap pile, the complaint in both cases being an out -of focus display. All the monitors on the scrap pile were fitted with Panasonic CRTs, so I was not able to compare the performance when a CRT of another make was fitted. Two different LOPTs were tried in an attempt to check whether this item was the cause of the problem, but there didn't seem to be much difference with either of them fitted. So I pushed the main PCB into the front plastic moulding that contained the least -bad CRT! In recent times I've had focus problems with CRTs from various manufacturers. My guess is that because of commercial pressure inadequate time is given to ensuring good evacuation. There could be contaminates in the vacuum, or possibly getter residues could accumulate between the focus and first -anode electrodes, their effect varying with temperature. A cure that sometimes works is to fit a flylead to the focus cavity on the CRT base and 'flash' this between chassis and the original focus lead a few times to produce an internal flashover and, hopefully, dislodge any particles that have accumulated on the electrodes. With some CRTs I've encountered this technique has been only partially effective or not at all. On one or two occasions I've resorted to drawing a spark from the anode cavity, which is a risky business. It was common practice in the days when TV CRTs needed their electrodes cleaning, but can be more tricky with monitors - especially as most won't run without a signal source being connected. The safest way to do this seems to be to use a scrap CRT base socket with a secure earth strap from the first anode pin to chassis or the Aquadag braid and a flylead from the focus cavity to the final anode cavity. As far as the monitor's chassis was concerned, the usual crop of electrolytic capacitors between the cable -mounting bracket and the line output stage heatsink needed attention. The two 250V electrolytics (lpF and 4.7pF) had off -the -scale ESR readings. Working across the board to the '3842 chopper control chip, I found that every 10pF, 50V electrolytic I encountered had an unacceptable ESR reading. But the large electrolytic capacitors on the secondary side of the power supply all had very low ESR readings, despite the fact that some of them run quite hot in operation. I.F. March 2004 TELEVISION 305 SERVICE To reserve your web site space telephone Tel: 01322 611289 Fax: 01322 616339 E -MAILS [email protected] gali mono I «rats $ goomenc CePter. On I at. I YE. la / - .. ...... Alban Electronics http://www.albanelectronics.co.uk Alban stocks, supplies and provides technical support for a range of terrestrial/cable/satellite and analogue/ digital TV equipment. PROMAX (manufacturers electronic test equipment including signal level meters, spectrum analysers, BER/CSI/MER analysers for QPSK, QAM & COFDM, optical fibre light sources and power meters, 16:9 test pattern generators), ALCAD (manufacturers of R.F. wide band and adjacent channel amplifiers, aerials for MATV, SMATV & IRS systems) and ANTARES (cascadeable multi switches). ALBAN has a complete after sales repair and calibration service that is fully supported by the manufacturers, in addition provides a free system design service using only reliable high quality components. (ALLTR A90 Oe ee Alltrade Aerials & Satellite Ltd http://www.alltrade.co.uk Leading distributor to the trade Full e -commerce site with over 1500 products with in -stock quantities!! We supply everything associated with Digital/Analogue Terrestrial & DTH/Motorised Satellite reception. All Antennas. All Brackets. All Cables. All Connectors. All Amplifiers. We provide a free MATV/SMATV planning service as well. Phone 0845 075 0751 Fax 01273 425700 Charles Hyde & Son Ltd http://www.charleshyde.co.uk Search for both original and copy spare parts in our extensive database covering Akai, Alba, Bush, Ferguson, Goldstar, Hitachi, LG, Matsui, Nokia, Saisho, Sanyo, Sony, Sharp, Thomson, Panasonic, Philips, Samsung, Tascam, Teac, Toshiba, Yamaha and many more. In addition huge ranges of Lasers, Loots, Remote controls and Semiconcuctors may be accessed. 041.141,13 WOE MOM Repairhelper's - Storefinder UK http://www.storefinder.repairhelper.co.uk We specialise in promoting electronic repair services throughout the Internet. It's a well known fact that the Internet is the fastest growing advertising medium today but the majority of repair companies and repair engineers are not making use of the Internet to gain more custom. Repairhelper's Storefinder is a UK Search Engine dedicated to the electronic repair trade (i.e. TV, VCR, DVD repair etc). Sign up with Repairhelper's Storefinder - you get your own optimized pre -built web page with a built-in online contact form and complete listings within the Repairhelper Network of sites. ts research & Desipt, Pitxhichcn Weimer Orb de Swim Mewls relagel rho% ms....mmrs hem sorpfen://,,eep One faWYY NeWS40.1.1111. ea nwervg rvn on Swires Research http://www.swires.com Swires Research produce high quality instruments for the television industry, including portable signal level meters and spectrum analysers for digital and analogue RF signal measurements. Wiltsgrove http://www.wiltsgrove.co.uk WILTSGROVE LTD founded in 1984, is renowned as a leading supplier of Audio, Video, TV, Spare parts and Accessories. We are now pleased to announce the launch of our ONLINE CATALOGUE: Our easy to use search engine will allow you to find the products you require via: Make/Model. Product Category. Key Word search. Manufacturers part number. Our Order Code. All orders before 5pm will be dispatched the same day. Tel: (0121) 772 2733 Fax: (0121) 766 6100 Email: [email protected] 306 March 2004 TELEVISION swires wow-, research IMDIGITAL T Analogue/Digital Terrestrial Signal level meter. UHF channels 21-68 pre-programmed into instrument. Strong fibreglass reinforced polycarbonate case. Long battery life - over 5 hours. Gives signal level and signal to noise (SNR) readings. DIGISAT 2001 Easy to use Digital Satellite meter. 13 preset satellites preprogrammed. Optional Software available to add more. NiMh batteries give over 4 hours continuous operation. Signal quality: Good, Marginal or Fail. Also gives BER and SNR figures. 40 Hornsby Square, Southfields Ind. Park, Laindon, Essex SS15 6SD. Tel: 01268 417584. Fax: 01268 419083 Visit our website at:- www.swires.com Wolsey Installe Meters Designed with the installer in min Customised lightweight ABS Shock Absorbent housings Purpose designed functional outer case with neck strap Ergonomically angled screen for maximum visibility Simple to operate with one hand 4 line display with backlight, showdsignal strength and quality Pre -programme for major Europe Satellites or UK Transmitters and Multiplexes Weighs less than 1Kg Mains and car chargers SAT 2 Meter (304051) TERR 2 Meter (304050) For details of distributors: T: 0845 601 0578 [email protected] Complete and fax the coupon to: +44 (0) 1353 654400 I wish to subscribe for one year to Television: E E Price UK E33.80 Europe E48.00 E Rest of World E63.50 US$99.00 Euro 100.96 I wish to subscribe for two years to Television: E Price UK E53.00 11 Europe E77.00 E E E Rest of World E99.00 US$154.00 Euro 157.41 Please tick preferred method of payment E I enclose a cheque payable to Highbury Business Communications Ltd E El Please invoice me Purchase No (NB Purchase order must be included to validate invoice) E Please charge my: Master Card/Visa/Amex/Diners Club/Switch/Delta please circle) Card No Expiry Date (Switch/Delta Only) Valid from / Ori Issue Number Signature Date Name Job Title Company Address e4N HIGHBURY Business Communications TELEVISION AND HOME ELECTRONICS REPAIR Television Et Home Electronics Repair magazine is the only magazine for technicians who deal with consumer electronic products, in particular TV, Video, Satellite and Audio equipment. Keep up to date with the latest information and changes affecting this industry including tips Et guides on repairing television and electronic equipment including satellite receivers, PCs, monitors, VCRs, DVD players, audio equipment and much more Postcode/Zip Country Telephone/Fax E-mail Please tick here if you do not wish to be contacted by other businesses either by Mail E Telephone Fax E E.mail Please return to: Highbury Subscription Services, Link House, 8 Bartholomew's Walk, Ely, Cambridgeshire CB7 4ZD, UK. Email: [email protected] (Quote ref: TV1) Make sure you receive your regular monthly copy by subscribing today. TELEVISION March 2004 307 TELEVISION BOOKS AND HOME ELECTRONICS REPAIR The Television Book Service offers access to our team of specialist publishing experts. We can order any book or CD-ROM currently in print from War And Peace to the Newnes Guide to Television and Video Technology. All books are delivered free of charge within the UK unless otherwise stated. Contact us at the numbers below: Telephone: 01737 812727 or 01737 812676 Fax: 01737 813526 Email: [email protected] CLOSED CIRCUIT TELEVISION: CCTV INSTALLATION, MAINTENANCE AND OPERATION Joe Ciesxynski CCTV surveillance is one of the fastest growing areas in the security industry, and this is a thorough guide to the technical side of CCTV including installation, maintenance, video recording, cameras and monitors. The second edition is fully dual -standard for PAL and NTSC systems. 2nd edition A Sept 2003 A 256 pages Glossary A Index A PB A Published in UK Code 0-7506-5728-6 £24.99 DVD PLAYERS AND DRIVES K f Ibrahim (College of North West London) DVD plagGils gilrlfas This text is based on handson experience and acts as a guide to DVD technology and its application, with a special focus on design issues. The principles of the subject are introduced from the basics, and DVD applications are illustrated by genuine technical information. ELECTRONIC CLASSICS: COLLECTING, RESTORATION AND REPAIR Andrew Emmerson This text encompasses all aspects of buying, collecting, restoring, repairing, sourcing parts, professional services, clubs and societies. The first part covers technical aspects of restoration and details where components can be found; the second presents useful information for collectors. INTRODUCTION TO DIGITAL SYSTEMS John Crisp This self -study text introduces digital electronics from first principles, before going on to cover all the main areas of knowledge and expertise. It covers the practicalities of designing and building circuits, including fault-finding and the use of test equipment. DICTIONARY OF VIDEO AND TELEVISION TECHNOLOGY Jack Tsatsoulin This work provides comprehensive and contemporary information on the essential concepts and terms in video and television, including coverage of test and measurement procedures. The CD accompanying the text includes an electronic version of the book. Sept 2002 A 365 pages & CD -Rom Published in UK Code 1 878707 99 ' £29.99 NEWNES DICTIONARY OF ELECTRONICS S W Amos; R S Amos Aimed at engineers, technicians and students working in the field of electronics, this dictionary provides clear and concise definitions, including TV, radio and computing terms, with illustrations and circuit diagrams. Aug 2003 A 256 pages A Glossary A Index PB A Published in UK Code 0-7506-5736-7 E24.99 Aug 1998 A 256 pages A Index 10 halftones A 50 line illustrations A PB Published in UK Cods 0 7506 3788 9 £21.99 Feb 2000 A 302 pages A Glossary A Index PB A Published in UK Code 0 7506 4583 0 £18.99 4th edition A Mar 2002 A 394 pages 100 illustrations A PB A Published in UK -Code 0-7506-5642-5 £12.99 NEWNES GUIDE TO TELEVISION & VIDEO TECHNOLOGY Eugene Trundle An exploration of television and video technology. It covers the fundamentals of digital television (satellite, cable and terrestrial) and digital video, as well as providing a grounding in analogue systems. 3rd edition A Feb 2001 A 432 pages A Index PB A Published in UK Code 0-7506-4810-4 £17.99 NEWNES GUIDE TO DIGITAL TV Richard Brice Covering all aspects of digital television, this text encompasses the electronics of the equipment, data compression, television production, servicing and the different transition methods - terrestrial, satellite and cable. The text has been updated with developments since the 2000 edition. 2nd edition A Oct 2002 A 304 pages A Index 45 illustrations 15 photographs A HB Published in UK (ode 0-7506-5721-9 £24.99 PRACTICAL ELECTRONIC FAULT Pfactiol &omit MI ravel IvrMpuel FINDING AND TROUBLESHOOTING Robin Pain (Design Engineer, Cotag nternational Ltd) A text using simple circuit examples to illustrate principles and concepts fundamental to the process of analog and digital fault finding. It aims to help the reader tackle any job, from fixing a P1 to improving the sound of a hi-fi. A digital multimeter and oscilloscope are needed for these jobs. Apr 1996 A 284 pages A Index 50 line illustrations A PB A Published in UK Code 0-7506-2461-2 £21.99 PRACTICAL ELECTRONICS HANDBOOK Ian Sinclair Practice! Electronic, Handbook A collection of all the key data, facts, practical guidance and circuit design basics needed by a spectrum of students, electronics enthusiasts, technicians and circuit designers. It provides explanations and practical guidance, and includes new sections on SHF techniques and intruder alarms. 5th edition Feb 2000 A 571 pages Illustrations A PB A Published in UK Code 0-7506-4585-7 £16.99 RSGB RADIO & ELECTRONICS COOKBOOK Radio Society of Great Britain AMOK ELECTRONIC COOKOOOK Only a basic knowledge of electronics is assumed for this collection of electronics projects, and it is ideal for all electronics and DIY enthusiasts and experimenters. Designed by the RSGB, the UK radio amateurs federation, the projects are clearly explained step by step. Nov 2000 A 336 pages A PB A Illustrations Published in UK Code 0-7506-5214-4 £17.99 REFERENCE DATA FOR ENGINEERS: RADIO, ELECTRONICS, COMPUTERS AND COMMUNICATIONS Mac E Van Valkenburg; Edited by Wendy Middleton Written by professionals for professionals, this is a complete reference for engineers. As well as addressing radio technology data, it covers digital electronics, computers and communications. 9th edition A Aug 2001 1568 pages & CD -Rom A 1385 line illustrations HB A Published in UK Code 0-7506-7291-9 £90.00 SERVICE ENGINEER'S POCKET BOOK Lewis & Sinclair This title aims to provide the service engineer with all the necessary information to carry out work on domestic electronics equipment. The coverage ranges from satellite reception to NICAM. Both analogue and digital equipment are covered, and there are chapters en common problems. Jan 1998 A 238 pages A FIB Code BUTO-7506-3448-0 £14.99 SERVICING TV, SATELLITE & VIDEO EQUIPMENT Eugene Trundle A practical hands-on guide for service engineers, installation technicians and servicing students, this text emphasises the practical business of fault diagnosis and repair of TV, satellite and video equipment. Revised 2nd edition A Nov 2001 A 336 pages Symptom index APB A Published in UK Code 0-7506-5507-0 £21.99 3Dt TELEVISION MICROPROCESSOR IC DATA FILES J Edwards Microprocessor ICs are the most complicated part of TV equipment and present special problems to the engineer. This text covers the most popular microprocessor ICs. Each device is presented graphically with the relevant data information given against each pin. TELEVISION IC DATA FILES 1 Edwards A compendium of data on all the most common integrated circuits used in televisions. Each device is illustrated with a pin -out diagram, and all the measurements and signal data in the book were token under actual working conditions. This second edition contains over 70 new ICs. TV FAULT- Potar. Mr-k-Fru FINDING GUIDE Edited by Peter Marlow IPTV A distillation of the most used fault reports from 11 years of Television magazine. Arranged by make and model, it features over 200 reports on over 300 models of television, including diagnosis and repair advice. VALVE AMPLIFIERS Morgan Jones The author's \tev Amplifiers 11111111MiNI straightforward approach, using as little maths as possible, should be of use to those with only a limited knowledge of the field as well as being the standard reference for experts in valve audio. Design principles and construction techniques ore also provided. Mar 1997 240 pages 200 line drawings PB Published in UK 1506-3335-2 f 19.99 2nd edition Jan 2000 245 pages PB Published in UK f 18.99 Mar 2000 381 pages Illustrations PB A Published in UK C f 20.99 3rd edition Aug 2003 A 624 pages Index PB Published in UK Code 0-7506-5694-8 f 29.99 VCR FAULT- Pappas Isalorlow FINDING GUIDE Edited by Peter Marlow 1111V1 CR FaW[Fneling A distillation of the most - used fault reports from 11 years of Television magazine. Arranged by make and model, it features over 2000 reports on over 200 models of VCR, including diagnosis and repair advice. VCR IC DATA FILES 1 Edwards This text aims to provide the VCR IC Data Files workshop technician and the field engineer with a convenient method of fault- finding without the need to consult workshop manuals. The most popular ICs used in video recorders are covered. Each device is presented graphically with data given against each pin. VIDEO AND CAMCORDER SERVICING AND TECHNOLOGY Steve Beeching A comprehensive guide to domestic VCR technology and repair techniques. This edition brings the information fully -up-to-date, with expanded coverage of camcorders, sections on DVD equipment and the latest VCR technology. VIDEO DEMYSTIFIED Keith Jack This edition has been updated to include information on digital television, datacasting, interactive video, digital camcorders and VCRs, and video interfacing. Coverage is international, including European, Asian and North/South American video standards, methods and techniques. Mar 2000 447 pages Illustrations PB Published in UK Code 0-7506-4634-9 f 20.99 Jul 1998 448 pages A 200 line illustrations PB A Published in UK Code 0-7506-3993-8 f 20.99 5th edition A Apr 2001 323 pages Illustrations A PB Published in UK (ode 0-1506-5039-i f 20.99 3rd edition A Jul 2001 784 pages & CD -Rom References A Glossary Index A PB Published in UK Code 1.878707-56-6 f 50.00 THE DIGITAL SATELLITE TV HANDBOOK Mark E Long The Digital Satellite If Handbook A handbook and CDROM pack on digital satellite television. It provides an overview of all the digital TV platforms in use world-wide. It includes satellite coverage maps and transmission parameters that readers will need to receive digital TV services from any location in the world. NEWNES GUIDE TO RADIO AND COMMUNICATIONS TECHNOLOGY Ian Poole This is a guide to the technology and applications of modern radio and communications equipment. The author's approach provides a useful foundation for college students and technicians seeking an update on the latest technology. TELEVISION ORDER FORM Please order or search the following: Code Description Qty Price Sept 1999 A 207 pages & CD -Rom A PB Code BUT 0-7506 7111 f41.99 VALVE RADIO & AUDIO REPAIR HANDBOOK Charles Miller A practical manual for VALVE OADIOS AUDIO HANDBOOK collectors, dealers and service engineers of valve audio and radio equipment. This edition includes new material on restoration and valve amplifiers. 2nd edition Apr 2000 A 280 pages 10 halftones A 50 line illustrations A PB Published in UK f 20.99 Jul 2003 A 352 pages A Index A PB Published in UK Code 0-7506 5612-3 f 16.99 NEWNES TV & VIDEO ENGINEER'S POCKET BOOK Eugene Trundle This updated text provides a pocket tool for service engineers. It presents a range of essential information in a compact form, covering television reception, satellite and cable television, video recorders, colour camera technology, teletext and fault-finding. 3rd edition A Oct 1999 A 512 pages NB (ode BUT 0-7506-4194-0 f 17.99 Name POSTAGE & PACKING FREE IN THE UK* Daytime Tel TOTAL Address I enclose a cheque/postal order value £ Postcode payable to 'Boffin Books Ltd' Please debit my Access/Visa/Switch/Delta card delete as oppliccHe Card Number. Issue number (Switch only) Expiry Date Signed 'Postage charges outside the UK available upon request or email: salesteam©boffinbooks.demon.co.uk Pester Boffin Books Ltd, 24 Walton Street, Walton -on -the -Hill, Tadworth, Surrey KT20 7RT, UK If you are ordering 6y credit card, need further information, or would like to use our search facilities, call 01737 812727 Fax 01737 813526 The arder/helpline is open from 9am to 5pm, or leave your order on our out -of -hours onswerline or email us at solesteaingboffinbooks demon.co uk When placing orders please quote Name Address (home & delivery) Daytime telephone number Debit/Credit card number Expiry date Details of order. Please note that prices may change, but are correct at time of going to press. 3o9 WHAT A LIFE! A mixed batch of faulty equipment. An even more mixed batch of customers. Donald Bullock's servicing commentary I'm not too good at remembering faces. Never was, and it has caused me more than a few problems over the years. This can be particularly so when I sell TV sets or whatever, especially those bought in at 'special' prices, where the profit margin might make the job almost worthwhile. A displeased customer When dealing with customers I can get really friendly and personable. Almost nice to know. It happened again last week. Paul had diagnosed a faulty smoothing block in Mr Hoighty's TV set -a monster with the largest screen I've ever seen and all the latest technical extras. It was capable of everything short of doing the washing up. But Mr Hoighty had become displeased with it, because this was the second time it had given him trouble during its first eighteen months. When we told him that this time we wanted £25 to repair it he became even more displeased. His eyes turned to slits, and he slammed his upper lip down like the top of a roller -top desk. "I gave it a chance last year" he hissed, "and let you repair it. I would have let you repair it this time if it had been under guarantee, like then. But nothing and nobody plays me up twice, see? I'm cute when it comes to paying out. You can keep the bloody set!" He signed our bit of paper with a flourish and strutted out, beaming like a victorious gladiator. Paul, who had witnessed it all, scratched the top of his head like a puzzled Stan Laurel. So I tried to ease his evident discomfort, 011y style. "What's the matter Stanley?" I asked. "Now it's ours. We can mend it and sell it for a mighty good price. Just think, Mr Hoighty hasn't been bad to us at all!" When dealing with customers I can get really friendly and personable - almost nice to know... "He hasn't?" said Paul. "Not at all" I said, "in fact he's done us nothing short of one great big favour." I began to hum a tune. Paul looked at me, pursed his lips and smiled with his mouth, though not his eyes. It wasn't long before the set sat gleaming in the middle of our shop display. When it caught the eye of Bertie Bunyan, happiness started to well up within me. The keener Bertie became, the happier I got. Within two minutes we were on the most jovial of first -name terms. Two minutes after that, as the set became his very own, he made me and our till croon. Our lifelong friendship had got off to a flying start. A day or two later, in the Red Lion, some chap started waving and grinning at me from across the room. I looked at him stonily. "Who's that lunatic over His eyes turned to slits, and he slammed his upper lip down like the top of a roller - top desk there?" I asked Steven. "The chap you sold that monster TV set to" he replied. I turned round to wave and return his grin, but by now he seemed to be deep in thought, studying the carpet. "Funny chap" I said. "Didn't really take to him. Bit dishevelled. Thought he might work for some oil -stained backstreet dump that tinkers with bangers... " "But don't you remember his face?" Steven continued. "Well, not really..." Video trouble Just then a heavy little fellow sloped up to us, nursing a pint. "Be you the Mr Bullock that mends tellys?" he asked. I gave him a watery grin and pointed at Steven. Pausing only to give me a withering look, Steven smiled at him and bent down to align his ear with the chap's mouth. "I don't wanna talk shop when you're 'aving a drink after a day's work, but I got a video, see?" he continued. "And he's gone dead like. 'Ow much would that cost now? Could you do 'im quick? Couldn't be much wrong like. Oney they've got brand new 'uns up town fer £35.50..." At that I caught sight of somebody I knew over the other side of the room and sloped off, leaving Steven to deal with the fella's questions. Next morning the chap waddled in with his recorder. It turned out to be a Samsung SV230B. He saw me there. "Joo work here?" he asked. Then he saw Steven. "I brought the recorder in, Mr Er..aww..ahh" he said. "I knows it can't cost much. Only the missus 'as this in -grown toe -nail like, an' sister ent none too good..." When he'd departed Paul took the machine to the bench and opened it up. 310 March 2004 TELEVISION It was dead all C714 (1,000pF, right. But nothing difficult. The two start-up resistors on the primary side of the power supply, "It blew up, Mr Bullock" he trumpeted. "Just as my wife was about to watch her favourite programme! 10V). C604 is in the line output stage and forms part of the unusual feedback drive R15D12 and R15D15, were Have you met my wife?" ... arrangement. C714 is the reservoir open -circuit. Once capacitor, on the he'd replaced them secondary side of the machine seemed to be OK. He that the carriage drawer would close the chopper circuit, for the 7V supply started to write out the job card. without a cassette in, but with a that feeds the 5V regulators. "Don't forget his wife's toe nail" I cassette in it wouldn't. When he Steven replaced them and the line said, "and the state of her sister ..." dismantled it he found that the capstan output transistor, after which the set Then we noticed a personable and, I motor was sluggish. It didn't respond worked happily enough. suppose, good looking chap in a leather jerkin thing. He was heading to cleaning and lubrication, so a replacement was ordered. It arrived Help wanted for the shop door and was carrying a first thing next morning. Once it had The phone rang. Steven answered it, VCR. been fitted the camcorder worked but I could hear the raucous voice from "Can't be coming in here, can he?" I normally. the other side of the room. It could commented. "He looks too normal." Later that day Mr Western popped his only have been Stan Idler. He did come in, smiling pleasantly, head around the door, said he was "If you comes outa your shop door and the VCR was an Akai VSG745. coming in, then dashed off again. But and looks to your right, you'll see me "Morning Mr Bullock" he said, he soon returned, and was happy that by my red car" he bellowed, "I'm closing the door quietly behind him. we'd been able to cure the trouble with wearing a brown trench coat and a big "Is there any chance you could repair his Samsung. cap like." this for me, please." "Glad you were able to fix it by Steven frowned and put the phone As Steven booked it in I could see today" he said, "only I needed it last down. He went out, huddling his that he was impressed. "Nice to night to see that Cheaters programme. shoulders against the rain, paused, encounter a normal fella for once" he Really good, innit?" looked right then ran off up the road. commented. This VCR was also dead, for the A blown up Sharp He was away for fifteen minutes. When he returned, puffing and same reason. Paul, who handles the Mr Christianiou hales from Greece. blowing, he was soaking wet and was videos, soon found that R209 (2701(52) He's tall and well padded, and sports a carrying a large 21in. Matsui set, was open -circuit. The repair took a big black moustache. The set he Model 2107R. matter of minutes. struggled in with was a Sharp "Thanks for 'elping me, Mr Bullock" The chap came back later that day, 51CSO5H, one that's fitted with the CS Idler said. "I'd have carried 'im and was happy with the price. He chassis. meself, except I've this bad back like." opened his jerkin and pulled out a "It blew up, Mr Bullock" he Steven opened his mouth to reply, but frilly pink handbag. trumpeted. "Just as my wife was about no words came out. I turned to Steven when he'd gone. to watch her favourite programme! "Give us a ring like" said Idler as he "As you said, he was a bit different" I Have you met my wife?" made off, commented. I shook my head. "Don't think I've "Where did you get to?" I asked A camcorder had the pleasure" I commented. He rolled his eyes and brought his when Steven had recovered his breath. "He was parked over a hundred yards Our next caller opened the door and hands up as though to conduct an unseen up the road" he replied. "He could have popped his head in. orchestra, swaying to its silent music. pulled on to the front ..." "Hello Mr Burford" he exclaimed, "Oh Mr Bullock" he continued, "my By now Paul had powered the set and "I'm Tom Western and I'm coming wife ..., my found that it was dead. The trouble was in!" Then he ran away. wife ..." He smiled happily at the in the start-up circuit, where a 1MG, We exchanged glances, but not for thought of her. 05W resistor was open -circuit. long. Within a minute or two he was "Er, yes. Well, right" I said. "We'll "Experience has taught me to suspect back, clutching a camcorder. It was a have a look at the set and give you a any resistors that are over 681(52" I Samsung VPL500. ring." commented, "the higher the value, the "He works, Mr Boodle, but he don't "Oh thank you, Mr Bullock" he more likely it is that you'll find them work" Tom explained helpfully. "You continued, "my wife will be pleased." open -circuit." puts a tape in, and he don't play it, then Then he closed his eyes and started A replacement got the set working you takes it out and he do." Steven swaying again. again. gulped a bit. "Any chance of me picking it up When he'd departed Steven pulled the set on to the bench. We've had a lot Keep it up! tonight?" of dealings with these sets. They can Many thanks to all of you who have "We'll try" said Steven, "call in about blow the line output transistor weekly sent me emails recently. I'll include five." unless you get to the root of the some comments next time. Keep it up "That's good of you. See you tomorrow." trouble, which is a couple of - you can reach me at Steven looked at this one. He found capacitors, C604 (330µF, 10V) and [email protected] March 2004 TELEVISION 31 1 .00-Th next program starts in 12 min vook,,le<1.° Photo 1: Some regular European high -definition TV channel transmissions via Astra at 19.2°E started in early January. SATELLITE NOTEBOOK Reports from Christopher Holland Hugh Cocks and Michael Dranfield HDTV The European high -definition TV channel via Astra at 19.2°E, mentioned in this column last November, started some regular transmissions at the beginning of January - see Photo 1. At the moment however the number of programmes is rather small. HDTV receiver boxes are still very thin on the ground, but a PC -based receiver can be used to receive the transmissions. The channel frequency is 12.168GHz, with vertical polarisation, a symbol rate of 27,500 and 3/4 FEC. C.H. Digital channel update The latest channel additions at 28.2°E are listed in Table 1. Where allocated, the EPG number is shown in brackets after the channel name. The old film channel TCM via transponder 18 (12.051GHz V, Astra 2A) and the channel with EPG no. 327, which were free -to -air, are now encrypted. Radio channels Kiss FM, Kerrang and Smash Hits, mentioned last month, have ceased testing on transponder 32 (Astra 2B) and have moved their tests to transponder D9S (Eurobird). C.H. Photo 2: Dish actuator used by Hugh Cocks with his 2m dish's polar mount for satellite tracking. Eutelsat 2F3 This month we'll take a look at the signals available via Eutelsat 2F3 at 21.5°E. The satellite is very busy, mainly with feeds for broadcasters, but there's a complication with reception. At the time of writing the satellite is in an inclined orbit of about 3° (this could increase as time goes on). This is sufficient variation in its location to require some adjustment of the receiving dish's direction to maintain reception during the course of a day. Geostationary satellites normally hold their position to within a tenth of a degree or so, enabling fixed receiving dishes to pick up the transmissions. To maintain this station -keeping accuracy most satellites have on -board gas -powered thrusters that are fired every so often. In general a geostationary satellite's life depends more on the amount of stabilising -thruster gas left than the on -board electronics. Towards the end of a satellite's useful life the stabilisers may be fired less frequently, the result being an inclined orbit. Eutesat 2F3 was launched in 1991, probably with a predicted life of 10-12 years. Many of the old Soviet Gorizont satellites had an inclined orbit from the start of ITV Nevi, Clean Fee Photo 3: An ITN feed via Eutelsat 2F3. ITV Newsnet Restricted to ITV regional companies j Deceita TifF.$5, For further into overnight please call the Photo 4: An ITN feed via Eutelsat 2F3. 312 March 2004 TELEVISION their lives, partly because of the relatively northern latitude of the launch site used to place them in orbit. They were intended for links to terrestrial rebroadcast transmitters that had specialised receiving dishes. Broadcasters that use Eutelsat 2F3 will have dishes with tracking facilities, at both the transmit and receive end. Part of the attraction of using this satellite is the lower charge made by Eutelsat in comparison with use of a 'conventional' geostationary satellite. A satellite news -gathering truck will have motors that enable the dish on its roof to locate satellites, so slight adjustment during an uplink period shouldn't be much of a problem for the operator inside. To track the satellite I use a standard dish actuator with my 2m dish's polar mount. It replaces the normal fixed adjuster, enabling the dish to move up and down. See Photo 2. The elevation actuator is coupled to an old positioner which is independent of the conventional polar mount actuator that drives the dish from east to west in the normal way. A fixed dish could be used for reception from the satellite, but some manual azimuth and elevation adjustment would be required. This would no doubt become tedious! The satellite wanders across the conventional geostationary-arc position twice a day, at about 1000 and 2200 GMT. If a normal polar mount is used to steer the receiving dish, these are good times at which to locate the satellite initially. As the satellite feeds tend to come and go, it's very convenient that several Italian channels use the satellite to link with Hotbird at 13°E and are always on air, see Table 2. The satellite is just over 2° to the east of the massive signals from the Astra 1 slot (19.2°E), so a dish with good side -lobe rejection is a help. Two very strong non -TV carriers are always present via the satellite's low band, at approximately 11.065GHz and 11.570GHz with vertical polarisation. They provide a convenient and easy way of finding the wandering bird with a spectrum analyser. An ITN feed channel is nearly always on air at 11.097GHz H, see Photos 3 and 4. The symbol rate is 5,632 and the FEC value 3/4. But the MPEG 4:2:2 format is used, whereas the Italian channels use MPEG 4:2:0 and can thus be picked up by any digital satellite receiver. MPEG 4:2:2 signals are most easily picked up using a Table 1: Latest digital channel changes at 28.2°E Channel and EPG no. Sat TP Frequency/pol FX UK (289) 26 21 12.110GHz/H Radio channels* EB D9S 11.623GHz/H VH2 (446) 2A 10 11.895GHzN *Heat, Kerrang, Kiss 100, Magic 105.4FM, Mojo, Q, Smash Hits and The Hits. TP = transponder. EB = Eurobird. 2A, 2B = Astra 2A/B. PC -based satellite receiving system, as described in the August and September 2003 issues. The satellite's lowest elevation occurs at about 1600 GMT, the highest twelve hours later at about 0400 GMT. With a 2m dish some adjustment is needed every half an hour or so to maintain maximum signal. The movement of the satellite in the sky is actually an elongated figure of eight rather than just up and down, so some fine adjustment of the EW actuator is required as well. Living in southern Portugal, which is near the bottom west of Eutelsat 2F3's footprint, I found that even before the satellite's orbit became inclined there was some variation (3dB or so) in signal strength, particularly in the 12GHz band, as the whole footprint of a satellite moves up and down. The effect shouldn't be as noticeable in the UK, which is away from the edge of the satellite's beam. During transmission of a feed I've noticed that, depending on its length, the signal strength can become gradually weaker - this occurs as the satellite moves away from the uplink signal - then suddenly strengthens as the uplink dish is realigned with the satellite. Feed frequencies occasionally used are as follows. Unless otherwise indicated, all have a symbol rate of 5,632 with 3/4 FEC and are horizontally polarised. Miscellaneous feeds: 11.023 and 12.694GHz. The latter uses vertical polarisation, has an SR of 4,094 and 1/2 FEC. Sky feeds: 11.041, 11.049, 11.685 and 11.693GHz. See Photos 5 and 6. ITN feeds: 11.065, 11.073 11.081, 11.089 and 11.097GHz (the latter is almost always on -air). France 2 feeds: 11.655GHz (see Photos 7 and 8). SIS feeds: 11.057GHz and between JERUSALEM EMMA HURD JERUSALEM STAND BY FOR TAPE FEE: Photo 5: A Sky feed via Eutelsat 2F3. SKY NEWS LONDON SIS CREW Photo 6: A Sky feed via Eutelsat 2F3. FLY AWAY N°6 A DESTINATION DE FRANCE 2 PARIS SCN, I 1000 hz rupte SON 2: 1000 hz 0 ).0 Photo 7: A France 2 feed via Eutelsat 2F3. Table 2: Italian channels via Eutelsat 2F3 Frequency/pol Symbol rate FEC 12.701GHzN 2,195 2/3 12.717GHzN 2,500 2/3 12.722G HzN 2,170 3/4 Channel name Sardegna Uno Sat Count Down TV Mediatel Photo 8: A France 2 feed via Eutelsat 2F3. TELEVISION March 2004 313 11.580-11.680GHz (see Photo 9). Very occasionally SIS feeds at 11.642, 11.662 or 11.682GHz use an SR of 10,850 and 3/4 FEC. BBC feeds: I've found BBC feeds at 10.961, 10.969, 10.978, 11.014, 12.548, 12.557, 12.568 and 12.571GHz with the standard characteristics. Feeds at 12.507, 12.512, 12.518, 12.526, 12.531 and 12.537GHz however mainly use an SR of 4,224 with 7/8 FEC, though the last two frequencies occasionally use an SR of 5,632 with 3/4 FEC. Very occasional feeds at 10.964, 10.982, 12.553 and 12.573 use an SR of 12,600 with 3/4 FEC. See Photos 10 and 11. There are two marker beacons at about 12.522 and 12.563GHz that may be present to help the BBC uplink trucks find the satellite. H.C. Pace 250053 The customer complained that some channels were missing. On test I test found that the digibox was stuck on vertical polarisation. When I selected a channel with horizontal polarisation, EPG no. 235, the LNB-polarisation change FET Q100 didn't apply 20V to the cathode of D100. POP IDOL EXTRA EPISODE: 19X IT2/00508/008/A LIVE TX: SAT 13.12.03 PART 3 (OF FOUR) I 20 40 FOUNTAIN TELEVISION 30 WEMBLEY STUDIOS , MCR 020 8902 8515 020 8900 5800 Photo 9: An SIS feed via Eutelsat 2F3. Q100 was not the cause of the fault however. There was only 15V at its input instead of 20V. In fact the 20V output from the power supply was missing - the 15V was coming via the FET's internal protection diode. When I examined the power supply panel I found a burnt -up, surface -mounted decoupling capacitor, C2532, on the underside. The track beneath it had also been damaged. No value for this capacitor is given in the manual, so I removed one from a scrap PCB and found that it's 47nF. A replacement capacitor and some track repair cured.the fault. M.D. 1 BBC SCOTLAND DSNG I Photo 10: A BBC feed via Eutelsat 2F3. 1 UKI524 OLD RUSTY Photo 11: A BBC feed via Eutelsat 2F3. 314 March 2004 TELEVISION Solution to Test Case 495 - see page 295 - Real Technician, after correct diagnosis and repair of the initial dead -set fault with the Sony TV Model KVX2928U (BE3B chassis), spent a long time jumping to conclusions, all wrong ones. It stemmed from his too -hasty check on the 135V HT line once primary power had been restored. In fact the voltage (there is no preset adjustment for it) was about right, and was certainly not triggering over -voltage protection as RT had supposed. Nor was there any problem in the line output stage: scan current and the CRT's beam accelerating voltages were being generated normally during the short burst of activity each time the set was brought out of the standby mode. In fact the cause of the problem was to do with the EEPROM chip IC002. It was not faulty but the data within it was incorrect. The data had probably been corrupted by the same mains -voltage surge that had destroyed the fuse and the chopper chip. IC002 needed to be reprogrammed, but the set first had to be made to stay on long enough for this to be done! The trick is to earth the `prof' line at pin 9 of connector CNO01 on board A. You then enter a specific eleven- or eight -key sequence to reinitialise the memory chip. Once the mains supply has been switched off then on again the software will be reset and normal operation restored. Wow! NEXT MONTH IN TELEVISION CES Las Vegas 2004 This year's Consumer Electronics Show at Vegas was a great success, a show -piece for an industry that sold over $96bn worth of goods in the US last year. Price competition is fierce, so the emphasis is on innovation and value-added to achieve profitability. George Cole reports on the highlights of the Show. Replacing the Painter chip Philips refers to the main microcontroller IC in the A1OE chassis as the Painter. It's a small, surface mounted 100 -pin device that can be the cause of many symptoms. Particular care is required when replacing it. Martin Cole explains how to go about the operation. Vintage radio repairs Pete Roberts provides further guidance on how to tackle vintage equipment. This time some faults with the Radford FMT I hybrid FM tuner and the Motorola 124 car radio. Wireless broadband links Steve Beeching on the advantages of having a wireless broadband link for internet connection. PLUS ALL THE REGULAR FEATURES TELEVISION INDEX & DIRECTORY 2004 Plus hard -copy index and reprints service Here's the essential repair information you need! The Television Index & Directory 2004, in CD-ROM form, contains the text of over 15,000 high quality fault reports on TVs, VCRs, Camcorders, DVD players, Monitors, Satellite TV units, Audio equipment and CD players, searchable by make and model, plus the text of 200 Test Cases and over 250 major servicing articles, from sixteen years of Television magazine. It also contains a full sixteen -year index of Television, a Spares Guide, a directory of Trade and Professional Organisations, an International TV Standards guide, a satellite TV Channel Finder, a TV transmitter list and a compendium of internet resources for service engineers. The software is quick and easy to use, and runs on any PC with Windows 95, 98, ME, NT, XP or 2000. Television Index & Directory 2004 CD-ROM, £199 Television Index & Directory 2004 CD-ROM upgrade, £46 (to qualify for this upgrade you need to have purchased a previous version of the Television Index on floppy disk or on CD-ROM) A six-month update of the index and fault reports will be avail -able in May 2004. If you wish to take advantage of this, £10 should be added to your order. Television Index only, 1988-2003, £36 Television Index only upgrade from previous versions, £18 Hard -copy indexes of Television magazine are available for Volumes 38 (1988) to 53 (2003) at £3.50 per volume. Reprints of articles from Television back to 1988 are also available, at the flat rate of £4.00 per article - you can order through our web site, or write to the address below. The above prices include UK postage and VAT where applicable. Add an extra £1 postage for non -UK EC orders, or £5 for non -EC overseas orders, although Channel Island residents do not need to add any extra postage. Cheques should be made payable to SoftCopy Ltd. All major credit and debit cards are accepted. Please use our new secure website for your orders, details below. Allow up to 28 days for delivery (UK). SoftCopy Limited, 1 Vineries Close, Cheltenham, GL53 ONU, UK Telephone 01242 241 455 Fax 01242 241 468 e-mail: [email protected] web site: http://www.televisionmag.co.uk Published on the third Wednesday of each month by Highbury Business Communications, Nexus House, Azalea Drive, Swanley, Kent, BR8 8HU. Highbury Business Communications is a division of Highbury Conununications PLC. Filmsetting by Impress, Unit 2, Parkway, Southgate Way, Orton Southgate, Peterborough PE2 6YN. Printed in England by Polestar (Colchester) Ltd., Newcomen Way, Severalls Industrial Park, Colchester, Essex C04 4TG. Distributed by Comag, Tavistock Road, West Drayton, Middlesex UB7 7GE (tel. 01895 444 055). Sole Agents for Australia and New Zealand, Gordon and Gotch (Asia) Ltd.; South Africa, Central News Agency Ltd. Television is sold subject to the following conditions, namely that it shall not, without the written consent of the Publishers first havingbeen given, be lent, resold, hired out or otherwise disposed by way of Trade at more than the recommended selling price shown on the cover, excluding Eire where the selling price is subject to currency exchange fluctuations and VAT, and that it shall not be lent, resold, hired or otherwise disposed of in a mutilated condition or in any unauthorised cover by way of Trade or affixed to or as part of any publication or advertising, literary or pictorial matter whatsoever. Television March 2004 315 *PERIFELEC MC 30 A Spectrum Analyser Synthesized satellite cable and TV field strength meter with panoramic reception on 14 cm (5,5") screen and digital carriers measurement. Complete microprocessor and isp1.51 logic control. Continuous frequencies from 46 to 860 MHz and from 920 to 2150 MHz on 4 bands. Selectable 4, 1 and 0,2 MHz spectrum band -width, picture measurement 1 MHz. Display of picture of selected synthesized channel. FM (Radio) LA:, B/G, I, DhOK', MM TV standards and Ku and C satellite standards. Possibility of 32 programs memorized per frequency band. Display (2 Lines of 16 characters). Range of measurement of signal strength from 20 to 120 clElpV, manual or automatic attenuator. Battery life about 1 hour 20 minutes, weight 5,8 Kg. Display of full -band and 4 possible expanded spectrums. Channels and frequency plans of cable and TV standards memorized. Frequency, signal strength in dBuV or bargraph, displayed on a digital display (2 lines of 16 characters). Voltage of remote power supply in 14v or 18v and 22 KHz in satellite .F Di5Eq Cr. v1.2 switching. The panoramic field strength meter MC30A combines in one instrument all the functions necessary for installing and checking TV or satellite reception, both analogue and digital. The visualization of the spectrum and the picture allows the carrying out of all the necessary adjustments with this one instrument. The high technology used in the MC30A allows a range of possibilities unheard of in a instrument in this price category Lacuna Digital Satellite Meter 4 custom designed, small lightweight ABS case, created with the installer in mind o Signal strength and BER will be displayed together lndetifies the chosen satellite Signal strengths and BER settings calibrated facility for recalibration by distributor Removable 'F' connector LOB short circuit protection and LNB power supply Compatible with all satellite transmissions ie. Ku and C hand, DVB and DSS HEW Lacuna Terrestrial Digital Meter Small, lightweight custom designed for terrestrial digital installations Identifies transmitter * Measures signal strength, carrier/noise and BER UHF / VHF Analouge and digital measurement Removable 'F' connector 4 line LCD with backlight * Weight including batteries 600g 12v line power facility Full catalogue of meters available, please phone for details. COASTAL AERIAL SUPPLIES va..a.s. Unit X2, Rudford Industrial Estate, Ford, Arundel BN I8 OBD Telephone: 0870 2641990 Fax: 0870 264 1991 Perifelec Sole Import Distributors I 4_4L*/ i L*1 i i 1 [x '14'1 [414-1 PO Box 73, Oakengates TF2 8WR Tel 41. 44 (0)1952 273130 F. »+44 (0)1952 405478 ®111110111111LCDED3C9 A.C/A4' CD DDLill D CD LIC5 ON ecidi SEN3IIIICC1O0N0iat0acTons ..t,®@[,,z Erix:a0 fktx COWGIT v,:' 0,,....., gis 6i1N14®u., -_, *typos of trionsistors 1110's diodes etc. or uhrolonto stocked We take your hassle Some suppliers just won't help.We will work really hard to find those difficult parts -just ask and let our 'no holds barred' enquiry hound work for you.! ! I - - CI Sisairl,oeo.kiriccaatlilt o1f.f1ecrs.-------) BBUUT5110A8©ACN@ICc3 eeaacchh FullyBUwTi1r1eAdF ©s4tra8iri:t;1l1e0aedacsh Cil Sliti ht i ill CC:till/ C ili.evice..... BBBBBB_UULUUUJ_552T5TOOvO1018.1888.1AAA0AA.FF.X.XXX.XXt555555182771489959751pppppp1ee9eee,a1aaaaa11TUCTT/5EDD2CNMA0AA3X20C8363004626I1A25A58rF4t3A:BXiXXXXlXl(5155555111 one_ 952858999452pppppp eeeeeeaaaaaa Philips type 1,2 volt Back up battery X 5 59p ea Philips type 2.4 volt Back up battery X 5 120p ea Scart - Scart lead 15m TPhoosritnorTPXT13070,TCHh9a8s0s0is9 Fully wired 1(W10hiDteG) R LOPTX X 2 eXa5ch 89p ea 59p ea £11,24 PA_hr_icliop_lsccCoaP4a9s0eCfllohaasamssisc->LOsIduPkrTi.Xccrrii a-,.4li-c1/4cf5aIllllli ,eirlra.ycahrsiics£.-1r1)l..i6a-3.a1- _ Remember £1.50 post & handling All major credit cards accepted The web page von. you can 1.4 up tie=gt1. getz,111.a;41LV=.5,2,1Air=gf::Ar model for vi es pert, reeds co.., LOFT', ale, CA14) CP. @ catalogue out NOW cameras, monitors, switches quads, multiplexers, the lot. REMOTES DIRECT All makes and models Replacement and Originals remote controls available. mmAt a fraction of the costmm Please contact for instant quote ROB or MARK Tel: 01257 793527 E-mail: [email protected] Or check out our website and order on-line Website: www.remotesdirect.co.uk Also available a wide range of satellite equipment And various other electronics!! I !lilt Tuner Repairs IC Filling Service Digital set top box repairs For more information and latest prices See our web site www.mces.co.uk MC HS Dill) ital. 15 Lostock Road Davyhulme Manchester M41 OES E-mail: [email protected] Phone: 0161 746 8037 Fax: 0161 746 8136 316 March 2004 TELEVISION GPTeaVntteeTrraenstost r SET-UP AND DIAGNOSTIC TOOL 'rest Card Colour Ito Burs! 1.n.. Scale Red Rater Green Raster Rise Sari, Blank Ranier £29.00 inc p&p Includes Free BBC Test Card F! Designed as an alternative to expensive pattern generators this comprehen- sive Service DVD gives you exceptional picture quality and portability of all your trusted favourites. All Test Patterns include a 1 KHz test tone. This is an exceptional tool for any service dept or field service engineer at a very affordable price. Enquiries: [email protected] Order Form: Enclose cheque for £29.00 made payable to A. Huseyin Name (Block Caps): Address: Post Code: Phone: Email: Send this form with your payment to: A. Huseyin. Unit lb Foxholes Ave, Hertford, Herts SG13 7JG NEW TUBE DISPOSAL. W76LPF / M9OAHL W76EGX / A8OEJA A59TMZ / A41EAM Other types also in stock. All at £20.00 each (Sending to Eastern Europe in 30 days time so be quick) New tubes urgently required, also TV sets with good tubes especially Widescreen. Tel 01474 361276/ 327677 Fax 01474 335228 E-mail: [email protected] D'Lec Components Ltd 3 Manor Court, Sole Street, Cobham Kent DA13 9BU England Visit www.dlec.co.uk Profilo Telra Brand New PT92 Complete Working PCB's (Widescreen Version) As used in the following makes of TV Bush, Fidelity, Wharfedale, Akura, JMB, Naiko & Watson BUY ONE GET ONE FREE Buy one carton of Perfect PCB's and get one carton of damaged PCB's FREE for spares Only £10 + VAT each in lots 9 Next day Carriage £9.95 Most major credit cards accepted Good Stocks of Virgin Returns in Televisions and DVD's For more information contact Contact Ian Botterill Key Electronics Ltd 01388 819525 TELEVISION March 2004 This Magazine reaches over 1 0,000 potential customers To advertise in this space call -Luke...on WEB SITE WWW.JOHNSRADIO-UK.COM WWW.JOHNSRADIO.COM JOHNSRADIO ELECTRONICS TEST AND COMMUNICATION EQPT MASSIVE 10,000 SO FT WAREHOUSE CLEARANCE SALE DC -MICROWAVE TO 300 GHZ - OPTICAL - LIGHT - EOPT - PARTS TEKTRONIX - HP - AGILENT - MARCONI PHILIPS - RACAL - B&K - R&S - W&G - ETC Sales Warehouse, Johnsradio, Smithies Mill, Birstal Smithies Lights, 883-885 Bradford Rd, Batley, West Yorkshire, WF17 8NN. Tel: 01924 442905 Fax: 01924 448170 E-mail: [email protected] Directions M62 Junction 27, A62 to Huddersfield, 1 mile to Birstal Smithies Lights, (6 roads) left under factory chimney aerial, Smithies Moor Lane 50 YDS second left red gate. HOURS M -F 9AM - 1PM AND 2PM - 5PM, SAT 9AM - 1PM Phone for appointment or to request item lists, photos, site mop. All welcome, Private or trade, for sales, workshop repairs or calibration. PLEASE CONTACT PATRICIA AT WHITEHALLL WORKS, 84 WHITEHALL ROAD, EAST BIRKENSHAW, BRADFORD, WEST YORKSHIRE, BD11 2ER Tel: 01274 684007 Fax: 01274 651160 WEB SITE WWW.JOHNSRADIO-UK.COM WWW.JOHNSRADIO.COM 317 FRUSTRATED! Looking for ICs TRANSISTORS A phone call to us could get a result. We offer an extensive range and with a World-wide database at our fingertips, we are able to source even more. We specialise in devices with the following prefix (to name but a few). 2N 2SA 2SB 2SC 2SD 2P 2SJ 2SK 3N 3SK 4N 6N 17 40 AD ADC AN AM AY BA BC BD BDT BDV BDW BDX BF BFR BFS BFT BFW BFX BFY BLY BLX BS BR BRX BRY BS BSS BSV BSW BSX BT BTA BTB BRW BU BUK BUT BUV BUW BUX BUY BUZ CA CD DX CXA DAC DG DM DS DTA DTC GL GM HA HCF HD HEF ICL ICM IRF J KA KIA L LA LB LC LD LF LM M M5M MA MAB MAX MB MC MDA J MJE MJF MM MN MPS MPSA MPSH MPSU MRF NJM NE OM OP PA PAL PIC PN RC S SAA SAB SAD SAJ SAS SDA SG SI SL SN SO STA STK STR STRD STRM STRS SV1 T TA TAA TAG TBA TC TCA TDA TDB TEA TIC TIP TIPL TEA TL TLC TMP TMS TPU U UA UAA UC UDN ULN UM UPA UPC UPD VN X XR Z ZN ZTX + many others We can also offer equivalents (at customers' risk). A LARGE RANGE OF ELECTRONIC COMPONENTS ON OUR CD ROM - LIST AVAILABLE ON REQUEST Mail, phone, Fax, Credit Card orders & callers welcome. VISA Connect Cricklewood Electronics Ltd 40-42 Cricklewood Broadway, London NW2 3ET Tel: 020 8452 0161 Fax: 020 8208 1441 www.cricklewoodelectronics.co.uk E-mail: [email protected] ELECTRICS LIMITED 171 HAREHILLS LANE, LEEDS LS8 3QE Tel: 0113 240 1114. Tel/Fax: 0113 240 7275. Mobile: 07976 403134 Email: [email protected] MANUFACTURES GRADED PRODUCTS ALL PRICES PLUS VAT: ALL PRODUCTS FULLY GUARANTEED PHILIPS 32PW6506 32" WIDESCREEN REAL FLAT, FM RADIO, 50HZ £329.00 PHILIPS 32PW9527 32" WIDESCREEN REAL FLAT, DOLBY, 100HZ, PIXEL PLUS £469.00 PHILIPS LX3000 DVD PLAYER 5.1 SURROUND SOUND SYSTEM, 75W RMS £139.00 PHILIPS 14" TV/VCR COMBI FROM £84.00 PHILIPS 14" PORTABLES FROM £59.00 PHILIPS VCR'S FROM £39.00 PHILIPS AUDIO SYSTEMS FROM £44.00 FURTHER OFFERS AVAILABLE PLEASE CALL FOR A PRICE LIST CREDIT CARDS WELCOME: NEXT DAY DELIVERY 318 WATCH SLIDES ON TV MAKE VIDEOS OF YOUR SLIDES DIGITISE YOUR SLIDES (using a video capture card) "Liesgang diatv" automatic slide viewer with built in high quality colour TV camera. It has a composite video output to a phono plug (SCART & BNC adaptors are available). They are in very good condition with few signs of use. For further details see www.diatv.co.uk £91.91+ vat = £108.00 Board cameras all with 512x582 pixels 8.5mm 1/3 inch sensor and composite video out. All need to be housed in your own enclosure and have fragile exposed surface mount parts. They all require a power supply of between 10 and 12v DC 150mA. 47MIR size 60x36x27mm with 6 infra red LEDs (gives the same illumination as a small torch but is not visible to the human eye) £37.00 + vat = £43.48 30MP size 32x32x14mm spy camera with a fixed focus pin hole lens for hiding behind a very small hole £35.00 + vat = £41.13 40MC size 39x38x27mm camera for 'C' mount lens these give a much sharper image than with the smaller lenses £32.00 + vat = £37.60 Economy C mount lenses all fixed focus & fixed iris VSL1220F 12mm F1.6 12x15 degrees viewing angle £15.97 + vat = £18.76 VSL4022F 4mm F1.22 63x47 degrees viewing angle £17.65 + vat = £20.74 VSL6022F 6mm F1.22 42x32 degrees viewing angle £19.05 + vat = £22.38 VSL8020F 8mm F1.22 32x24 degrees viewing angle £19.90 + vat = £23.38 Better quality C Mount lenses VSL1614F 16mm F1.6 30x24 degrees viewing angle £26.43 + vat = £31.06 VWL813M 8mm F1.3 with iris 56x42 degrees viewing angle £77.45 + vat = £91.00 1206 surface mount resistors E12 values 10 ohm to 1M ohm 100 of 1 value £1.00 + vat 1000 of 1 value £5.00 + vat 866 battery pack originally intended to be used with an orbitel mobile telephone it contains 10 1.6Ah sub C batteries (42x22dia the size usually used in cordless screwdrivers etc.) the pack is new and unused and can be broken open quite easily £7.46+vat = £8.77 Please add 1.66 + vat = £1.95 postage & packing per order JPG ELECTRONICS Shaws Row, Old Road, Chesterfield, S40 2RB Tel 01246 211202 Fax 01246 550959 MastercardNisa/Switch Callers welcome 9:30 a.m .to 5:30 p.m. Monday to Saturday TUBES NEW and GRADED Philips CRTs 28" WIDESCREEN from ONLY £130 from 32" WIDESCREEN ONLY £195 Prices include carriage but are subject to VAT Quantity reductions Other makes and sizes of CRT available De -scratching service EXPRESS TV SUPPLIES LTD The Mill, Mill Lane, Rugeley, Staffs WS15 2JW Tel: 01889 577600 Fax: 01889 575600 March 2004 TELEVISION Technical Liaison Officer Linn Products Ltd manufactures a wide range of products for music, home cinema, sound distribution and home automation applications. From its distribution centre LinnSight Ltd, in Prestwick, Ayrshire, Linn distributes premium brand Loewe televisions, DVDs, VCRs and audio solutions to the UK and Eire. These high quality products are technically advanced to meet the needs of the most discerning customers. We require a Technical Liaison Officer to develop and provide expert technical support for the Linnsight business and our customers. This is a field based position and will involve extensive travel within Scotland, Northern England and Ireland. The main responsibility of the role is to create and implement initiatives to: Continually improve the expertise and service offered to our customers by the technical support network. Develop the network by identifying and targeting new sectors within the market. Ensure the application and maintenance of agreed technical support standards and policies. Reduce the number of complaints and returns by providing support and advice for the retail network. Applicants must have an HND in electronics, an understanding of current and future display technologies - CRT, LCD and Plasma, and be able to demonstrate a sound technical background. The successful candidate will be a pro -active individual with problem solving skills and the ability to interact with people at all levels, whilst projecting a professional image at all times. If you think can meet the challenge of this role please e-mail your CV to [email protected] or mail it to the Recruitment Team, Linn Products Ltd, Floors Road, Waterfoot, Glasgow G76 OEP. To find out more about Linn please visit the website at www.linn.co.uk LINN TELEVISION March 2004 319 Service Link TELEPHONE 01322 611289 FAX 01322 616376 FOR SALE ? STOP LOPT'S. REMOTES ALL TV COMPONENTS FIDMAN MAIL. ORDER LTD 236 SANDYCOMBE RD KEW RICHMOND SURREY TW9 2EQ (1/2 MILE FROM KEW BRIDGE) PHONE: 020-8948-3702 EX RENTAL TVs, VCRs, PORTABLES SERVICE DATA NEED HELP NOW? Then ring the * ELECTRON TECHNICAL HELPLINE * Genuine help available to all repairers of T.V. - V.C.R - SAT - AUDIO (Inc Valves) Over 30 years experience and vast data base 0906 470 1706 Calls cost 60p per minute Hours of Business Mon to Fri 9.00 am -12.30pm : 2.15pm - 5.30pm Sal. Morn 9am -12.30pm SERVICE DATA SERVICE MANUALS Have you ever turned away work for want of a Service Manual? Have you ever brought a Service Manual and never used it more than once? Then why not join ... THE MANUALS LIBRARY For details and membership application form write, phone or fax: HARVEY ELECTRONICS 43 Loop Road, Beachley, Chepstow, Mons, NP16 7HE Tel/Fax No: 01291 623086 Visa: Mastercard accepted For stock list call Barry McDonald 01622 719313 or 07836 789528 PROJECTOR SPARES VIDIKRON projector spare parts and service information. PROJECTSPARES Tel: 01444 831769 Fax: 01444 831580 E-mail: [email protected] REPAIRS Trade repairs to Sky digiboxes Pace, Amstrad, Grundig, Panasonic, (including Fluid Ingress). All makes repaired at a fair fixed price. Scan Digital Services For details Give Alan a ring on Tel/Fax: 01633 25 40 50 E -Mail: [email protected] 320 OPEN 6 DAYS 1V/VCR CIRCUITS (WE DO NOT STOCK AUDIO OR MONITOR INFORMATION) TEL A.T.V. on 0114 285 4254 CTV Circuits from £5.00 VCR Circuits from £7.00 CTV Manuals from £10.50 VCR Manuals from £14.50 User instructions also available (P/P add £2.50 to each order) 419 LANGSETT ROAD SHEFFIELD S6 2LL MANUAL COLLECTIONS PURCHASED, (POST 1995) SERVICE INFO TV - VIDEO - AUDIO Prices- any make/model CTV s/man 9.50 VCR s/man 13.50 CTV circs 4.50 VCR circs 6.00 Other items POA All prices include p/p. Do not add any VAT AMTeI Huna, Caithness KW1 4YL 01955 611313 www.amtel.co.uk WANTED BEST CASH PRICES PAID FOR VALVES KT88, PX4 AND MOST AUDIO/OTHER TYPES. Tel: 01403 784961 Billington Export Ltd Sussex RH14 9EZ Fax 01403 783519 Email: [email protected] Visitors by appointment LINEAGE CHEAPEST: CABLE TIES, FUSES, plug -tops, crimps, tapes, tv/video, handsets, extension leads, fax, printers, baskets, ladies trousers. Tel: 020 7232 2266. Fax: 020 7232 2288. ENGINEERS PLEASE CHECK OUT: www.modecontrollers.co uk for a device, which will save time/money & change the way you repair equipment forever. TELEVISION MAGAZINES:- March 1973 - present, complete set. To be collected or will be disposed of. North Lincolnshire 01724 346355. Free of charge. Service Link TELEPHONE 01322 611289 FAX 01322 616376 For a FRE E consultation on how best to market your products/ services to a professional audience contact LUKE on 01322 611289 Automatic component identification (Inductor, Capacitor or Resistor) Passive Component Analyser (Model LCR40) fully inclusive UK price Component value measurement Auto frequency (DC, 1kHz, 15kHz, 200kHz) Inductor DC resistance measuremenTaL Just clip on the test leads and press test. The Atlas LCR will automatically identify the type of component, apply the appropriate test level and frequency, display the component's value and more! Probes are detachable too, so you can use the optional SMD tweezers for your tiny unmarked passives - fantastic. Non=volatile grobeveomrensation memo * Detachibleeprobes allowing use of optional test prods, SMD tweezers, etc... Hands free mode with value hold woo de Inductance range: lun to 10H sst.9 Capacitance range: 1pF to 10,000µF Resistance range: 10 to 2MO Basic accuracy: 1% Test signals: 1V, 3mA max See the full review on our website! "Astonishingly, this little unit seems to pack most of the punch of a large and very expensive automated LCR bridge into its tiny case." Andy Flind - EPE Magazine March 2003 Accessories: Carry case Tweezer Probes Crocodile Probe Set Large Grabber Probes (more available soon) Semiconductor Analyser (Model DCA55) enclosure colours may vary Automatic component identification Pinout identification HPN bipolar Darlineton fully inclusive I 11( price Transistor gain measurement Diode protection between C-E MOSFET gate threshold measurement PN junction characteristics measurement Resistor shunt between B-E Check and Shorted Junction identification Cur rent Bain identify Transistor leakage measurement Hfe=126 Just connect the part anyway round and your semi S press the button! 4EniTancernent, MOSFET Auto power on/off Bipolar transistors, "It's the kind of sho1c1 Darlington transistors, Diode protected transistors, tnstrument that Resistor shunted transistors, should be on every Enhancement mode MOSFETs, Depletion mode MOSFETs, Junction FETs, Low power triacs and thyristors, engineers and enthusiasts bench." Diodes and diode networks, EPE Magazine LEDs ( I-bicolours) March 2000 atiesaca LOZ4fralid DCA55 Pack Why not order both analysers at the same time and take advantage of our special offer, saving you £10! Visit www.peakelec.co.uk to download the data sheets, user guides and copies of independent reviews. You can pay using a cheque, postal order, credit or debit card and even pay securely online. Please contact us for your volume requirements. AlsOunirble from Parnell, Maplin, Rapid and CPC (prices vary) Atlas House, Kiln Lane www.peakelec.co.uk Harper Ind. Est., Buxton LO, Derbyshire, SK17 9JL, UK [email protected] electronic design ltd Tel. 01298 70012 Fax. 01298 70046 11\ TELEVISION TEST PATTERN GENERATORS The new GV 998 is a digital pattern generator offering more advanced features at again a realistic price. Those features include : MPEG-2 format Transport Stream generation Video and audio included in the TS Video and audio inputs Generation of a variable frequency sound carrier for decoding verification Multistandard and multisystem analogue TV signal generation Possibility to edit different fields of the TS database to present the name of the service provider Remote control via a personal computer Moving video patterns to check MPEG-2 decoders PRONAAX 11/4 PROMAX SELECTED ITEMS FROM THE PROMAX RANGE OF TEST EQUIPMENT MS 250 Analogue and Digital Satellite Detector. PROMAX GV SERIES Choice of 12 instruments NICAM and Teletext 4:3 and 16:9 Formats Full field and VITS Computer Controlled Front panel memories Own Company Logo Computer Monitor testers Hand Held Models Multi Standard, PAL, NTSC, SECAM High Quality Construction r:- Attractive Price Levels Full After Sales Service Available from Stock L ISM 41 c(3 PRODIG 1 Satellite Dish Installer's Meter Does more than just BSkyB .0- 0.IT^ 61 ANIA1.00LIE TY LEVEL METIER cM es 55Z35`; icco PROO10-2 PRODIG 2 Analogue & Digital Aerial Meter Measures digital channel power and C/N ( .................. MC 377+ Analogue & Digital, Satellite & Terrestrial Measures channel power and C/N FOR TELEVISION PATTERN GENERATORS, THERE'S NO WIDER CHOICE THAN WITH PROMAX PRONAAX PROLINK 3 + 4 SERIES Satellite & Terrestrial, Analogue & Digital, Spectrum Analyser with BER (optional on P3) (Alban) ALBAN ELECTRONICS LIMITED THE PROMAX SERVICE CENTRE 6 Caxton Centre, Porters Wood, St. Albans, Hertfordshire, AL3 6XT. TEL: 01727 832266 FAX: 01727 810546 WEB : www.albanelectronics.co.uk EMAIL : [email protected] SALES + SERVICE + CALIBRATION 4614.. PRONAAX TELECOMMUNICATIONS TEST EQUIPMENT AE 767 Spectrum Analyser ..... rigalliallialigligla"1111111114v 1.4 ,....1 /N.M. E /el r CDPdfCompressor 6.6.1697 CVISION Technologies