What the System 11 power supply board feeds
The power supply board makes +5 V for all boards and the +100/-100 V for the score displays. It passes the +18 V lamp matrix supply through a fuse only, and handles the GI on games before Banzai Run. It also does some light processing of the solenoid voltage.
The power supply board also makes about +100 and -100 V DC for the score displays; keep hands and probes clear of that section while the game is on.
Systems
Related tips
- Routine high-voltage changes on every System 11 power supply
- Rebuilding the +100 V section of the power supply
- Rebuilding the -100 V section of the power supply
- GI connectors left the power supply after Cyclone
- High-voltage supply rebuild parts, System 3 to 11C
- Display voltages at 3J2, power supply D-11883/D-12246 (Taxi to Dr. Dude)
- System 11 backbox boards and supplies
- +5 V fuse blows the instant the game is switched on
Source: Repairing Williams System 11 Pinball 1986 to 1990, Deel 1, Clay Harrell (pinrepair.com)