System 11 bridge rectifiers and their filter capacitors
Power supply BR1: +5 V logic, filtered by C10 (18,000 mfd 20 V), then the regulator and Q5 (2N6057) on its heat sink; fuses F5/F6 sit ahead of it. Auxiliary board BR1: +25 V solenoids through C3 (100 mfd 100 V). Auxiliary board BR2: +50 V solenoids through C1 (100 mfd 100 V). On Fire! and earlier these two bridges are bolted in the backbox. 6BR1 at the lower right of the backbox: +18 V lamp matrix with a 30,000 mfd 25 V capacitor beside it. Flipper power board BR1 (Fire! and earlier): +50 V flippers through C1 (100 mfd 100 V). Board-mounted bridges have wire leads; backbox bridges have lugs.
Systems
Related tips
- System 11 backbox boards and supplies
- What the System 11 power supply board feeds
- System 11 power supply versions D-8345 and D-12246
- Routine high-voltage changes on every System 11 power supply
- High-voltage supply rebuild parts, System 3 to 11C
- Game boots only sometimes, 5 V drops out: cracked diode D6 on the power supply
- Low +5 V (below 4.9 V) from the power supply
- Low +12 V (below 10.5 V)
Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Two, Clay Harrell (pinrepair.com)