Dot matrix display power connector pinout and voltages

Measure at the display with it connected, or at J604 on the controller board; use the key pin to find pins 1 and 8. Pin 1: -125 V (-110 to -130), later lowered to -115. Pin 2: -113 V (-98 to -118), later -103. Pin 3: key. Pins 4 and 5: ground. Pin 6: +5 V (4.9 to 5.2). Pin 7: +12 V (10 to 14). Pin 8: +62 V (58 to 68).

These are high voltage supplies (over 100 V). Measure carefully with one hand and keep clear of the pins.

Systems

• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Related tips

• Dot matrix display supply voltages
• Rebuilding the dot matrix high voltage section
• Dot matrix display blank or faulty
• One or two display columns stuck on
• Resets caused by a failing dot matrix display
• What the WPC dot matrix controller does
• Dot matrix display faults
• Blank display, garbage or diagonal lines: reseat ribbon cables

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