Can a Big Shot or Hot Shot owner confirm correct operation? On my game, when the outhole kicks the ball over to the shooter lane the trough switch under the apron causes the score motor to run and causes a second firing of the ball return solenoid, even though there is no ball in the outhole. It is causing the player unit to not always advance to the next ball since the score motor is running. Any time the trough switch is activated....by ball or manually under the playfield the score motor runs and the outhole kicker fires. I am guessing I have a fault that is allowing the second outhole kicker activation

Strange that the outhole would fire with no ball to kick, but no matter....it seems when a ball is kicked from the outhole it is happening too soon and the game isn't ready to register the trough switch in order to step the player unit. If I stop the ball momentarily after it is kicked and then allow it to cross the trough switch it will advance the player unit (and activate the outhole kicker again.) I'm thinking a timing issue. MarkG do you have the score motor switch dog positions from the schematic? I have the rest of it in pieces but that part is gone.

I was using schematic snippets posted in another thread, but I did see that handwritten notation. I went thru all the switches in those paths to the player unit a third time...fingers crossed it is playing normally now! Thanks guys

Spoke too soon. Every few balls the bonus count and bank reset runs longer than it should and the ball kicks out prior to completion, thus failing to advance the player unit. When it does it, it appears the banks are resetting more than once.

By longer than it should I mean the drop banks reset twice that I can tell, so it seems the score motor is still turning when the ball crosses the trough switch and doesn't register.

ZB looks ok with plenty of gapping. The target banks are still sometimes resetting more than once, despite the ball kicking out from the outhole. I am going to go through whatever triggers the bank resets. The issue seems to be that the target bank reset is taking longer with the multiple resets while the ball is already kicking out....not that the ball is necessarily kicking out early

I had previously replaced the bonus unit stepper pawl arm with one from a 60's era game because it was worn and not stepping consistently. The 60's pawl was shaped slightly differently and used a different smaller spring setup, which was occasionally allowing the stepper to overrun the home position triggering the C relay and hence another reset. It was tricky to find because it stepped flawlessly by hand but the rigorous target scanning was too much for the different pawl to handle. Just need to source a suitable replacement and the issue is resolved. Thanks Mark for the help!