When one drop target switch closes, every other switch in its column stops working until the target is reset. The suspect switch itself never registers.
Closing one switch kills the whole column: slam tilt switch touching the coin door
Cause: The coin door slam tilt switch had been bent so it touched the grounded door, shorting the matrix.
Checks
- Unplug the cabinet or coin door switches and see if the fault goes away.
- Look for switch blades, wireforms or brackets touching grounded metal.
Fix
- Bend the slam tilt switch away from the door so it can't touch.
Systems
Games
Related tips
- Tilt doesn't work and closing it fires a pop bumper: dirty slam tilt switch
- Switches register with the wrong numbers
- Pop bumper and both outkicker switches dead: bare wire touching the coin door
- One switch or a string of switches never registers
- Strange coil and switch faults from a drop target bank short
- Coin door switch shorted to ground causes lamp and other odd faults
- Several playfield switches drop out together: worn insulation shorting the start button
- Pop bumper or slingshot fires by itself; random tilts
Source: Pinball Repair help group!! (Facebook group)