Solenoid driver/regulator board test point voltages
TP1 and TP3: +4.9 to 5.2 V DC. TP2: +190 V DC (often set down to 170 V to extend display life). TP4: +230 V DC. TP5: +12 to 16.5 V DC unregulated. If TP2 and TP4 both read 230 V, the high-voltage regulator section has failed.
The score display supply runs at 170-230 V DC; keep hands off the rectifier and driver boards with power on.
Systems
Related tips
- Solenoid driver/voltage regulator board test points
- Solenoid driver board: test points and regulators on the layout aid
- Jumper TP1 to TP3 on the solenoid driver
- Solenoid driver board: how the MPU selects a coil
- Ground mod for the solenoid return at J3 pins 23-24
- Skip the driver board mods on Baby Pac-Man
- Rebuilding the solenoid driver board high-voltage section
- High-voltage section parts on the solenoid driver board
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part One, Clay Harrell (pinrepair.com)