Peculiar thing: when I start a multi-player game on a cold machine ['73 Gottlieb Hot Shot], after Player 1 loses first ball, it won't advance to player 2, but just gives a Player 1 Ball 1 again. This happens again once or twice after each drain, then finally goes to Player 2, and everything plays perfectly normal for the whole rest of the game. The trough ball switches appear to be fine, as far as I can tell. After I've played for maybe 20 minutes, the problem goes away, usually. Thanks for any insight.

Hi Fred, thx a lot. I’ll check those now and report back. Yes I have schematic and used it to my first diagnostic success so far (led me to a weak spring) though it’s still a struggle as a newbie.

The player unit seems very clean and spry. Not sluggish. The signal to fire the solenoid isn’t coming, I have now observed. It kicks out the ball, lots of turning and resetting happening, but the solenoid on player unit never firing. Checking schematic for what’s supposed to fire it, any advice appreciated!

Sorry forgot to reply and thank you for this HowardR