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Thanks Ed!
Ed,
If you're out there, thanks a million for the shortcut on my JVC BR-S822U. I injected a 30 Hz pulse from my VC93 to TP7 on the D/C Servo board, and the picture popped in clear as a bell. The only thing before TP7 is the head drum, so I think we got it licked. The picture comes and goes at regular intervals of course, since there's no sync between the VC93 and the rest of the VCR, but I got what I was looking for - a steady picture for a few seconds to tell me the heads are definitely good.
Being me, I started off getting too complicated again and recapped the D/C Servo board before I did some simple scoping around. Where I should have gotten a PG pulse, I was getting nothing but square wave harmonics and noise, probably leakage from nearby circuitry. Well, now I'll know I have a healthy servo board ~ ~ ~
Over the weekend I'll pull the mechanism for a good cleaning and lube, at which time I'll replace those caps on the stator board. With any luck, I'll have (3) good 822's which will complete the video portion of my makeshift studio. $100 to get a used BRC for the time code translation to the ADAT's, and I'm in like Flint and can start some serious band recording. I sure didn't expect it to be this easy, since VCO's and PLL's drive me crazy at work - these PG feedback circuits don't seem too dissimilar. At any rate, you pretty much fixed it for me.
Thanks again Ed !!!
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