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Please forgive the excessive individual posts; for some reason my edits won't take when I try to update. I'm going to recap the CTL/Servo board before I go taking the drum assembly apart to work on the stator board, which looks fairly involved on this machine. My PG pulse is clean and strong, just has that strange duty cycle problem. Since the pulse goes through so much junk on the CTL/Servo board, I figure it can't hurt to replace thoese caps before going much further.
I see now that the pulse is still effectively 30 Hz, but that long duration of the positive half-cycle is what the counter is triggering on. There are some electronic switches (IC's) on that board also which explains why the pulse would abrubtly change when in PLAY mode. I think a few bad caps could wreak this kind of havoc, so you know what I'll be doing after work this evening.
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