Barry777
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Aug 31, 2010, 1:55 AM
Post #2 of 9
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Re: [Veepa] JVC BR-S800U issues.. (..and Sony UVW-1800)
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Hi Veepa,
The JVC BR-S800U is indeed a great player, costing more than $3000 when they were new. I have two of those, two S500's (same unit without the recording functions), plus three BR-S822U's and a few of the BR-7000 series. I guess you could say I'm a huge fan of JVC VCR's, and also have a fully equipped electronics shop to keep them in good working order.
First, let's reset everything to how it came from the factory. To do this, hold down "Counter Reset" and "Eject" together while turning the unit on. Now all the mysterious and invisible menu settings are set for "normal" operation and a standard tape should play just fine.
But of course it won't - I can see from the picture that there is an actual circuit problem. So my first guess is that you're missing the PG pulse, which keeps the picture locked in. If you feel daring, take the bottom cover off, then unscrew the 2 screws that hold the largest board in place. The screws are captive and won't come out all the way. Once the screws are loose, gently pull off the long white connector closest to the screws, then gently pull out the 2 very thin ribbons on the side of the board. Now you should be able to gently swing that board out and see the bottom of the mechanism.
Without touching the sides of the video head drum, give it a little spin so you can see where it is from the bottom of the unit (you do have the unit on its side, right?). You'll see the lower drum spin when you do this. There is a small circuit board attached to the lower drum, and on that board you'll see one tiny silvery-looking cylinder standing up. If you look closer, you'll be able to read the value which should be 3.3 uF at 50 volts. This is the capacitor that processes the PG pulse from the head drum, and the picture looks like that puppy is either leaky or open. You can replace it with a standard 3.3 uF, 50 volt electrolytic capacitor which is easier to find and probably cheaper. Notice that the existing capacitor has a black stripe on one side - this is the negative side, and the new one MUST be installed the same way. A standard electrolytic won't look anything like the original, but will still have the negative stripe down one side.
Replace that, then we'll go from there if needed. It could also be a bad video head or some other circuit problem, but you would need some test equipment and electronics knowledge to do any effective troubleshooting. We'll start with the most common causes first - and of course you've already tried cleaning the video heads?
On the Sony: Even though the tapes are the same size and shape, Betacam is an entirely different format than Betamax and likely won't play a standard Betamax tape. Betacam was the professional industry standard before everything went digital, and they designed the Betacam format to be able to use a standard Betamax tape in an emergency with reduced quality. This enabled the professional field videographer to easily obtain emergency blank tapes at the local outlets when needed, rather than being dead in the water on an important shoot. This idea, obviously, was generated before VHS pushed Beta out of the picture and you could buy blank Beta tapes in most stores.
The machine should play its own recordings using a standard Beta tape, but probably won't play any tapes recorded in the Betamax format. The process of recording, processing and playing video is incredibly complex, and it's simply not possible to juggle formats except by dubbing - and even that is sometimes impossible without extra equipment.
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Barry Fone - VCR Repair hobbyist and professional FAA Repair Station Avionics Bench Technician (top level). TEST EQUIPMENT: (4) Sencore VC93 VCR Analyzers, (11) Tentel gauges, Sencore VA48 and (2) VA62 Video Analyzers, Sigma Electronics TSG-375 NTSC/SMPTE Video Generator, several VCR Alignment Tapes, plus countless Oscilloscopes, Frequency Counters, Wow and Flutter Meters, Distortion Analyzers, Vectorscope, 136-channel Logic Analyzer, Signature Analyzer . . . . VIDEO GEAR: (6) JVC BR-S822U's, (3) JVC BR-7000 series, (3) JVC BR-S500U, (2) JVC BR-S800U, JVC GR-800U and (2) GR-860U Editing Controllers, Sony FXE-100 Video Switcher/Effects Generator, (5) Time Code Generator/Readers, (1) Sony SLO-1800 (Beta), (2) Alesis ADAT-XT, (1) Sony DXC-1200 TV Camera, Pioneer VP-1000 Laser Disc Player plus many consumer grade Beta and VHS VCR's. Passionate electronics enthusiast since 1973...most anything except computers. Check out my collection at www.barrys8trackrepair.com/MyVideoGear.html
(This post was edited by Barry777 on Aug 31, 2010, 2:24 AM)
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