Resetting replay values and high scores
With the game on, press the red button on the MPU board itself (not the self-test button on the coin door).
Systems
Related tips
- U9 pin 2 (halt) is not high
- Garbage in the bookkeeping totals
- Seven flashes but no attract mode
- Garbled player 1 display and strange play from a bad 5101 RAM
- MPU board test point voltages
- MPU stops before the 7th LED flash (no 43 V)
- Add a ground jumper on every -17/-35 MPU
- Testing an MPU in the game with only J4 connected
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)