The game suddenly goes to Game Over during play.
Game drops to Game Over in mid-play
Cause: A slam switch (coin door or ball-roll assembly) with too little contact pressure opens from vibration; or an open coil suppression diode or broken joint on a pop, flipper or sling coil.
Checks
- Check contact pressure on both normally closed slam switches.
- Check the diodes across the pop bumper, flipper and slingshot coils.
Fix
- Adjust the slam switches (or defeat the slam circuit).
- Replace open diodes and resolder broken joints.
Systems
Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)