Pop bumper driver board 6-pin connector
Pin 1 is the switched ground to the coil being driven, pins 2 and 6 are ground, pin 3 is the key, pin 4 is the trigger input (the board fires when it is grounded) and pin 5 is +5 V. Seen from the board the order reads 6, 5, 4, key, 2, 1, with pin 6 at the end nearest the capacitor that sits above the power transistor. It gives one pulse per trigger, so a stuck switch cannot burn the coil.
Systems
Related tips
- How the System 80 pop bumper driver board works
- Bench check of a pop bumper driver board
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Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)