Every so often the game goes haywire and keeps scoring the bank shot lane as if its switch were stuck closed, though the switch is open. Other games play normally.
Bank shot lane scores by itself now and then: replace the switch diode
Cause: A failing diode on the star rollover switch, even though it tested good with one leg lifted.
Checks
- Check the switches in the same area for stuck contacts.
- Look for loose or broken diodes on nearby switches and reflow them.
Fix
- Replace the diodes on the suspect rollover switches; they're cheap and can fail even when they test good.
Systems
Games
Related tips
- Random game faults when a switch without a diode sticks
- Switch reads stuck closed, or a pop bumper chatters
- Pop bumper or slingshot fires by itself; random tilts
- Clear stuck switches using switch test
- Test a playfield switch diode
- What bad switch diodes do to the matrix
- Strange coil and switch faults from a drop target bank short
- Switches register with the wrong numbers
Source: Pinball Repair help group!! (Facebook group)