Pre-WPC-95 bridges, filter caps and fuses by supply

BR1 with C6 and C7 (15,000 mfd 25 V) feeds F114: +18 V for the lamp columns, which then passes Q2 (LM7812) and F115 to make regulated +12 V for the switch matrix. BR2 with C5 (15,000 mfd 25 V) feeds F113: +5 V logic, the most failure-prone set (also upgrade C4). BR3 with C8 (100 mfd 100 V) feeds F112: +50 V solenoids. BR4 with C11 (15,000 mfd 25 V) feeds F111: +20 V flashers. BR5 with C30 (15,000 mfd 25 V) feeds F116: unregulated +12 V for playfield devices, optos, the DMD and the coin door. On the Fliptronics II board BR1 with C2 (100 mfd 100 V) feeds F901-F904, +50 V for the flippers; later boards leave C2 off and it is not needed.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)

Related tips

• Bridge rectifiers to use on WPC-S and earlier driver boards
• Filter capacitors and GI triacs that fit WPC boards
• Bridge positions on WPC-S and earlier driver boards
• WPC power driver bridge rectifiers and +5 V regulator
• Shorted or open bridge rectifiers
• Testing a bridge rectifier out of circuit
• Checking a filter capacitor for ripple
• 'Check F114 and F115' with switch 24 open: missing 12 V, bad bridge BR5

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Two, Clay Harrell (pinrepair.com)