Barry777
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Jan 15, 2010, 5:37 AM
Post #8 of 9
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Re: [jts1957] JVC HRS5975 - Broken
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Purchasing the service manual for this model (or most any VCR for that matter) will teach you endless amounts about how they work in general, mechanical parts common to most units, and especially what NOT to try without having the proper gauges and test equipment. Many VCR problems can be diagnosed by simply watching the mechanism try to work, while others can be very deceiving and involve parts you wouldn't even be aware of without some technical guidance (for instance, the "mode select switch" which is usually hidden and is operated by the mechanism during its many movements). Trying to repair or adjust the unit without knowing what the problem is will only make it worse.
I would recommend a basic book on VCR repair, PLUS the service manual for the unit(s) you own. After several sessions on the toilet with these publications, you won't believe you once tried to fix VCR's without them. I made my living repairing TV's and VCR's in the 80's when they were still relatively new and didn't suffer the effects of age - in most cases I was able to muddle through using my eyes and ears. But nowadays, they have much different problems and require a lot more time and study to effectively repair, not to mention that most of them are now out of alignment and require some test equipment and Tentel gauges to get them back up to snuff - especially Beta machines which are more complex and have more to adjust. Whereas most VHS machines have 2 adjustable guide posts, the Beta format has a minimum of 9 - PLUS a capstan tilt adjustment on some units. These adjustments all have a large effect on playback quality, and can result in no playback at all if adjusted too far out of spec.
Unfortunately, most service manuals don't include detailed information on exactly how the mechanism works, this is where the basic rapair book comes in handy. Using bits and pieces from both publications, one can usually figure out what goes on to produce a picture and sound.
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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
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