Quoted from jorant:
That doesnt seem to be it, sadly
The game, sometimes, takes up to two seconds before it decides to make the time expander motor to turn on. I really don't know what this could be. I'm running the L2 rom. I assume that's the newest one? Kinda getting ready to give up. It works, but randomly fails now and then. Like no power is getting to the motor in game (in test it goes right away, every single time).
Could be a bad/loose crimp on a connector from the MPF causing weak signal.
Its possible that a crimped wire is just hanging by a thread or a wire on the motor.
Most are in pretty bad shape, they take a beating.
It probably time to cut them all off and re-pin them all at this point.
I changed them all on my game, both sides.
Bad ground/return wires will cause anemic power problems.
Anyone who restores one of these games finds TONS of bad wire throughout.
The wires on my MPF were crispy as hell and broke when trying to flex them.
Its also possible that the motor and gearbox is slow running due to age and dried grease.
If you havent already, I would get a new one. 30 years is a long time.
When I replaced mine, the old one ran twice as slow as the new one when testing on a 10 volt power supply.