New to pinball repair. Have surf champ that when started score motor ran continuously. finally figured out stepper in head needed to be manually moved to a start position. now when I test it will play and score but will not advance ball count. The machine will accept multiple players and I did manually step the stepper in head and machine did operate i.e. step thru players and ball count. Seems like I am close but can't figure out last little bit. Any help will be greatly appreciated.

Thanks for your replies. Am trying suggestions now that have recovered from the "holiday spirits" so to speak. While trying to clean steppers and checking add player I realized didn't give a good description of problem so here it is. When machine turned on I can add players and machine resets correctly. Can play the first ball and everything works ok i.e. scores correctly. When ball goes out of play (outhole?) three things don't happen 1. targets don't reset 2. ball number doesn't advance and 3. doesn't go to next player. (with single player machine stays on ball 1). Like I said in origin post can manually activate stepper in head and that will step thru ball in play and all 4 players ok. Hope this is better description.

Thanks for all the help. Turns out problem was mostly add player unit. Machine is playing all 4 players and ball in play # advances. Again thanks for the help.