Barry777
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Jul 25, 2010, 3:40 PM
Post #92 of 98
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So, thus beginneth the process of going through all my machines for full cleaning, lube, check of alignment and replacement of all power supply caps. Already ordered the 100 uF, 35 volt caps to repair the rear panel audio board on the one machine that is not fully functional and it looks like I'm going to win the BRC. So that I don't have unnecessary complications with the overall setup, I'm going to really tip-top all these machines. One S500 is decidedly a parts unit since it has no top or bottom cover and the front panel is horribly cracked. This is the one I used for practice to service the capstan before going into the good units. Just for fun, I decided to troubleshoot the occasional servo problem which cleared up when I applied a heat gun to a certain part of the servo board. Well, maybe I applied a bit too much heat, or Q43 was already funky - but that rascal shorted, taking D30 with it and producing a nice smoke column rising up from under the metel shield. Both parts are discontinued, but I did find them on a JVC parts site. $13.95 for the transistor and $5.95 for the diode. Do I spend the money just to have a spare servo board which may still have the same problem, since I already have a good, entire spare unit? The way the machine is now, I won't balk at pulling a motor out of it. But if I fix it, then I'll be wrestling with the idea of cannibalizing a working unit when I need a part. Oh, decisions..... Well, I decided to pull out the shorted transistor and diode, and the rest of the machine still works fine - so I guess nothing else blew. You know I can't resist having another spare servo board, and I have to order a bunch of caps anyway. Geez... But anyway, here's another example of how the error codes can be misleading, as I get error code 008-01 (supply tension failure) as well as the expected 73 (takeup motor failure). Since there's now nothing to drive the takeup motor (missing that transistor), there should be a 73. And since there's nothing pulling the tape in FF mode to put any tension on the tension arm, that explains the 008-01 code. Well, $66.11 from Mouser to fully recap the power supplies in all 7 machines, counting caps I already have in stock which is most everything 1000 uF and under. This will also stock up my empty 220 uF drawer and leave me several spares of sporadic values. Could have gone a lot cheaper, but ordered in multiples of 10 to make the math easier. So, figure about $100 to also replace that transistor and diode on my spare servo board, then what - about 20 loading belts to take care of all 7 machines and have some spares for other units. Then finally, a bunch of RS-232 cables to make everything talk to each other. Sure is cool to be this close to finishing the setup - YES! Also glad to have some new customers writing in for repairs, or my forehead would surely carry the proud indentations of that skillet. . . . 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 Jul 26, 2010, 12:06 AM)
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