Permanently defeating the slam switch on the CPU board

Steps

• Remove the CPU board.
• Solder a jumper across capacitor C2 (which grounds the R12/C2 junction).
• Refit the board; the slam switches and their wiring no longer matter.

Systems

• Gottlieb System 1

Related tips

• The slam switch must be closed for the game to run
• CPU board reset circuit check
• Gottlieb reset circuit update
• Slam and outhole switches sit outside the matrix
• CPU plug A1J7 (playfield switches) pins
• System 1 CPU board connectors
• Aftermarket System 1 CPU boards
• CPU connectors that fail most

Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)