Just starting to get this project Lucky Hand up and running. It was a mouse house barn find with major cosmetic issues and so I’m doing the restoration backwards. After restoring the playfield mess I’m now starting on getting it playing.

It came without a transformer so I put in a used one and got it to where it lights up and score motor resets to home position but when I manually activate the start relay the Subtract Ball Count Unit coil plunger fires constantly even though it is reset to its home position and the big solenoid on the Sequence bank arm fires repeatedly and of course the score motor runs.

I’ve checked and cleaned the switches on the AX relay and they looked to be gapped correctly. I’ve also cleaned up the BCU stepper and the Lightbox Advance stepper but still no luck. Any ideas where to look would be greatly appreciated. I have the schematic.
Danny

Thanks a bunch @mopar. That sounds like a great explanation of what I’m getting.

I’ll be checking on it tomorrow morning and let you know what I find.

Thanks for all the detailed advice Mopar . You nailed it. The large contacts on Score Motor 2B were filthy. Once I cleaned them up everything is resetting fine except I need to adjust a runout switch on the 100s score reel. The credit button also wasn’t working but I ran that down to a bent open switch on the Credit Unit.

Thanks again, lots of time spent on this one so far but I’m getting pretty close now.