How WPC connector and fuse numbers work

The first digit of a J or F number is the board: 1 power driver, 2 CPU, 3 display driver, 4 display, 5 sound, 6 dot matrix controller, 7 printer, 9 Fliptronics. So J103-5 is driver board jack 3, pin 5, and F501 is sound board fuse 1.

Systems

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

Related tips

• GI connectors on the driver board
• CPU board switch connectors
• Repair a burnt GI connector on the driver board
• Check the AC power input connectors too
• Lamp matrix connectors on the driver board
• Use crimped Trifurcon pins, not IDC, when replacing connectors
• Thin wire on J120 adds to burning on WPC-S
• DMD shows a few dots and a coil fuse blows after reseating boards: ribbon off one row

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