I recently purchased a dead SO. I have managed to battle through my ignorance and get the game up and fully functioning (pats self on back).
I do have one intermittent problem. Occasionally, the player one 100,000 score light comes on without being earned. Sometimes it comes on during the “reset” cycle, right before the ball is ejected. Other times it randomly comes on during a game in either one player or two player games.
Per the schematic, the last switch before the light relay is the 10,000 score reel P.T. DU. 9th position switch. If I block that switch, the problem does not happen, and of course the light does not come on even when earned.
I have visually compared the switches on both the Player one and Player two 10,000 score wheels and they are set the same.