Entering the service menu, the items scroll by themselves as if a button were held down. Disconnecting the flipper board makes no difference.
Service menu scrolls through items on its own: short on a service switch
Cause: A short on the wiring of one of the service (coin door) switches.
Checks
- Unplug the coin door switch connector: if the scrolling stops, the fault is in the door switches or their wiring.
- Look for pinched or bare wires and solder bridges at the service buttons.
Fix
- Clear the short at the service switch.
Systems
Games
Related tips
- Cannot enter high score initials with the flipper buttons
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- Solid state flipper flutters when held
- Coin door test buttons bypass the switch matrix
Source: Pinball Repair help group!! (Facebook group)