Resolder the driver board header pins
Steps
- Remove the driver board.
- Remove the old solder from each male header pin with a desoldering tool (just reheating often does not wet the pin bases).
- Resolder each pin with fresh solder.
- Do this before chasing other faults: the board flexes whenever it is unplugged and cracks these joints.
Systems
Related tips
- Resolder and inspect the driver board header pins
- Always replace the driver board's 40-pin female interconnector
- Replace the 40-pin interboard female connector
- Resolder board header pins properly
- Slingshot kicker never fires from its switches: loose pin at 2J13
- Freezes mid-game and blows solenoid fuse F2: clean and reseat the 40-pin interconnect
- Damage after the black and white plugs were swapped
- Removing the old interboard female connector
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)