WPC-95 driver board LEDs and test points

Ground is TP107. LED100/TP100: +12 V regulated (F101, F106). LED101/TP101: +5 V logic (F105, diodes D7-D10, C9). LED102/TP102: +18 V lamps (F106, D11-D14, C11/C12). LED103/TP103: +12 V unregulated (F109, D3-D6, C8). LED104/TP104: +20 V flashers (F107, D15-D18, C10). LED105/TP105: +50 V coils, 50 to 70 V (F108, D19-D22, C22). LEDs 104 and 105 fade out when the coin door opens.

Systems

• WPC-95

Related tips

• Supplies made on the WPC power driver board
• Driver board supply test points and normal readings
• Adding backup jumpers to a WPC-95 driver board
• WPC-95: all the 20 V coils dead, fuse good
• WPC-95: a dark +20 V LED at TP104 means the flasher supply is not leaving the board
• WPC-95 LED101 off (+5 V, game will not boot)
• Testing a WPC-95 rectifier diode
• WPC-95 power driver board LEDs, test points and fuses

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