I'm looking for some help with a single player Gottlieb Batter Up machine. I have searched the forums, watched YouTube videos until 2 am for weeks and read through the Pinrepair.com documents on EM repair until my eyes hurt. I have stared at my machine for hours and looked at the schematic until my head hurts and have yet to find my problem.
The issue is as follows;
The machine starts and resets properly and plays fine. The problem is twofold and I think related to each other. The 100 and 1000 score reels both move at the same time and when the hundreds reel gets to 9 all scoring stops. For example, if I manually trigger a 100 point score the reels register 1100. If I hit it 500 it registers 5500. Then when the 100's reel gets to 9 all scoring stops and there is a hum. The hum appears to be coming from both the 100 and 1000 score reel coils which both are showing 26v across the coils when the scoring stops.
I have cleaned and checked the alignment and spacing on all of the switches on the scoring relays and don't see an issue with any of them and I have cleaned and checked the switches on the scoring reels paying close attention to the 9th position switches on the 100 and 1000 reels.
What might I be missing? Am I correct in assuming that the problem is somewhere on the back board or could it be something under the play field?
Doug