Lamp matrix connectors on the driver board

WPC and WPC-S: rows on J133, J134 and J135 (wired the same); columns on J137 and J138 (large, wired the same) and J136 (small 3-pin). WPC-95: rows on J124, J125 and J126; columns on J121 and J123 (large, wired the same) and J122 (small 3-pin). Because these plugs are interchangeable they are easy to mix up.

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
• Repair a burnt GI connector on the driver board
• WPC lamp matrix and GI driver parts
• GI string dead with a scorched connector
• Driver board LED6 off (+18 V lamp matrix)
• 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

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