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Friend of mine asked me to take a look at this. Nice older deck and when behaving, maintains a steady lock on both speeds. Pots work as they should. Problem is once in a while it will just go hog wild fast. Shut power off and restore, returns to normal. But it will go wild again. This is PLL quartz lock direct drive. I’ve witnessed the dirty pot drift in other decks but I don’t think that’s what’s going on here. Suggestions?
Yes, the first thing I did after initial inspection. Now I can’t recreate the problem YET. Gotta love the intermittent problems Maybe I solved it but I’m going to scope it, check voltages and a quick check of the power supply caps. I have the schematic.