WPC-95 rectifier diodes, filter caps and fuses by supply

D3-D6 with C8 (10,000 mfd 35 V) feed F109: unregulated +12 V for playfield devices, optos, the DMD and coin door. D7-D10 with C9 (10,000 mfd 35 V) feed F105: +5 V logic, the most failure-prone set (also upgrade C1, 100 mfd 25 V, to 470-1000 mfd). D11-D14 with C12 (10,000 mfd 35 V) feed F106/F101: +18 V lamp columns, then Q2 (LM7812) and F101 for the regulated 12 V switch supply. D15-D18 with C10 (10,000 mfd 35 V) feed F107: +20 V flashers. D19-D22 with C22 (100 mfd 100 V) feed F108/F102/F103/F104: +50 V solenoids. D25-D32 rectify the 6.3 V GI; from Scared Stiff on they are replaced with jumpers.

Systems

• WPC-95

Related tips

• Testing a WPC-95 rectifier diode
• Filter capacitors and GI triacs that fit WPC boards
• Replacement bridge rectifier and diode ratings
• WPC-95 filter capacitors are smaller (10,000 mfd)
• WPC-95 uses discrete P600D diodes instead of bridges
• +20 V filter capacitor C11 (C10 on WPC-95) blows apart
• WPC-95: a dark +20 V LED at TP104 means the flasher supply is not leaving the board
• WPC-95 LED102, LED103, LED104 or LED105 off

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