GI connectors on the driver board

WPC-89/WPC-S: J115 (12 pins) GI input from the transformer; J120 and J121 (11 pins) GI outputs, usually backbox and playfield; J119 (3 pins) to the coin door. WPC-95: J103 input, J105 and J106 outputs, J104 coin door. All use .156 inch Molex-style pins.

Systems

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

Related tips

• Repair a burnt GI connector on the driver board
• Lamp matrix connectors on the driver board
• GI string dead with a scorched connector
• GI out because the GI connector burned
• Check the AC power input connectors too
• Backbox GI out while flashers work: burnt connectors at J120 and J121
• Resets from worn power connectors between transformer, driver and CPU boards
• Burned power driver board traces at the header feeding AC to the Fliptronic board

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