Try getting the sam's (IIRC it is in sam's VCR-3) and checking the power supply voltages. Lytic caps will go bad in stuff of this vintage.
I have one of these decks, and after much mussing with the electronics and mechanics I've given up....I may start mine again, but these are complex suckers, and much of both the mech and electronics are failure prone at this age. Having to deal with multiple issues on something like this can have you chasing your tail.
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