WPC-89/WPC-S driver board LEDs and test points

Ground is TP5. LED1/TP3: +12 V regulated switch supply, always on (F115). LED4/TP2: +5 V logic, always on (F113, BR2). LED5/TP7: +20 V flashers (F111, BR4). LED6/TP8: +18 V lamp matrix (F114, BR1). LED7/TP1: +12 V unregulated (F116, BR5). TP6 (no LED): coil supply, 50 to 70 V (F112, BR3).

Systems

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

Related tips

• Voltages made by the WPC power driver board
• Bridge rectifiers to use on WPC-S and earlier driver boards
• Supplies made on the WPC power driver board
• Driver board supply test points and normal readings
• Bridge positions on WPC-S and earlier driver boards
• Adding backup jumpers to a WPC or WPC-S driver board
• Coil 50 V test point and circuit (WPC-S and earlier)
• Driver board LED1 off: switch matrix 12 V missing (WPC-S and earlier)

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