Quoted from Jbelleville:I should have been more specific. The buzzing solenoids are Q,U, and R in particular. These are to relays in the bottom of the unit. Using the circuit diagram and the operating instruction someone provided I was able to trace the entire circuit and there are no problems with any of the switches, so I'm left with nothing other than these solenoids that maybe causing poor connections. I can get the player and ball count to work intermittently with no consistency. I'll have only one player up and when the ball drops back down it may advance to player 3 or to ball 2, random stuff that sort of thing, which could all be related to weak of fuzzy connections causing the motor to over-run. Literally, I can't find anything wrong with the switches/wiring. I'm going to next pull out one of the solenoids and do and Ohm's check and see what it is. If anyone has dealt with similar issues and has any advice, I'd be grateful to hear from you. Thanks.
Isnt Q the 1st ball relay? Like the hold relays these are on for extended periods and I always replace...