Recently acquired Stern EM Disco pinball game. Few issues I had to work thru with unresponsive playfield, typical gummed up steppers etc.

Anyhow I got everything working and the score motors were sticky. Removed player one score reels, cleaned and put back in place. Ran thru a few games and all worked well.

Started two player game and all worked well but the two player score reels were all sticky. Game ended, turned off machine, removed first score reel (do one at a time and test) from two player side, cleaned, put back together and tested. Now when starting a game it keeps going thru the reset sequence (single player/can't get into the two player feature because its stuck in reset sequence). All player one reels reset as normal but the game just keeps looping.

Start game relay stays engaged. If I manually pull it open the ball ejects and game plays fine.

I've rechecked the score reels and all looks good. For the life of me I can find the problem. Is it a coincidence that this just happened after player 2 reel was cleaned? During 1 player game does the 2 player reels also have to reset?

At a loss here and could use some suggestions.

Ok so all 2nd player reels have to reset too 0 as well. Wasn't sure if that was required during 1 player game but it may explain what is happening as it only started happening after initiating the first 2 player game.

I'll pull those reels this evening and see what happens.

I'm hoping it's not one of those wiper fingers...can find replacements anywhere just in case.

Alright so I've moved forward a little. Its in the process of resetting player two reels. Setting these reels manually the game plays fine. Both player one and player two score points and reels move. However, when the game ends and I start a new one. The player one reels reset fine. Player two reels do nothing. They have to be reset manually and the game works again.

I jumped the solenoids on player two from player one and they fire during the reset sequence. So it has to be in the reset side of player two somewhere.

Any ideas anyone?

Found the problem to be in score motor impulse switch. Seems two are listed in this cabinet...assuming one is for player 1 and the other for player two. Re-adjusted switch, cleaned and now player two score resets as needed.

Looking over the switch banks they all need cleaning by the looks of it...score motor switches look very intimidating thats for sure.