Working on a Criterium 75, and impatiently waiting on the schematic to arrive. I did clean all of the switches in the back box, and on and under the playfield. That usually works, but not this time.

The backbox reads "player 1", but I am stuck in two player games. I have re-cleaned the contacts on the "balls unit", but that didn't help. Any ideas of where to look?

Hi Rolf, my Criterium 75 has the Control-Bank.
Thanks for the reply and the links. I wouldn't have found those by myself.

It took awhile to figure out how to access the switches in the control bank, but you were right. There was a switch blade that wasn't making contact in the 2nd player relay. Thanks, again, for your advice and your insight!

EDIT: I haven't solved my problem, though. Now I can play a 1, 3, or 4 player game, but I can't play a 2 player game. I think I have to go back and make sure other blades are making correct contact in the 2nd player relay.

Hi Rolf,

When I press the credit button for the second time the second player light comes on and the credit wheel deducts another credit. Yes, the backglass lights the "two can play". The game then plays like a single player game. It skips the second player.

When I press the button at the beginning of a new game three times, the "three can play" lights come on and the credit wheel deducts three times. The game will play normally for player 1 and 3, but it skips player 2.

It is the same for a 4 player game. Press the button four times, four can play lights come on, four credits deducted, and players 1, 3, and 4 play normally. Player 2 is skipped.

Also, at the end of 3 or 4 player game, the "One Can Play" lights goes out and the other stay on.