Pressing the right flipper button randomly scores targets, trips return lane switches and the tilt, flaps the gates, and sometimes restarts the game.
Right flipper triggers random switches, gates and resets: broken coil diode lead
Cause: One lead of the diode on the right flipper coil had broken at the lug. Without it, the voltage spike when the coil switches off disturbs the electronics.
Checks
- Gently pry each flipper coil diode lead against its lug with a small screwdriver to find a break.
- Confirm the EOS switches open when the flipper is held up by hand.
Fix
- Resolder or replace the broken diode on the flipper coil.
Systems
Games
Related tips
- Every System 11 flipper has an EOS switch and coil diodes
- Testing flipper coil diodes
- Flipper slow with no snap after a rebuild: EOS lead on the wrong coil lug
- Both left flippers lose power: broken solder joint on the upper flipper coil
- FL11630 flipper coil wiring and diode layout (F-14 Tomcat and later)
- Flipper coils have two windings
- How the two windings of a flipper coil work
- How a System 11 flipper coil works
Source: Pinball Repair help group!! (Facebook group)