After sitting unused for a few months, the game no longer ends after ball 3: the ball counter runs on to 5, goes blank, and play continues indefinitely. Unplugging the game doesn't reset it.
Game never ends after the last ball: bad connection at the backbox plug
Cause: A poor connection at the plug between the backbox score unit and the main cabinet, which carries the end-of-game circuit.
Checks
- Clean the ball count unit's contacts and check its reset coil and spring.
- Check which version of the schematic matches the game.
- Unplug, clean and reseat the connectors between the backbox and the cabinet, and check their pins for tension.
Fix
- Repair or clean the bad connection at the backbox-to-cabinet plug.
Systems
Games
Source: Pinball Repair help group!! (Facebook group)