The right flipper buzzes and chatters when held up, and will not hold when the EOS is blocked closed and the flipper is lifted by hand. Three different coils gave the same result.
Right flipper chatters when held up: plunger not bottoming on the coil stop
Cause: The plunger did not fully reach the coil stop at the end of its travel; it only just touched it, so the hold winding could not keep it in.
Checks
- Push the plunger in by hand: you should hear and feel it bottom firmly on the coil stop, the same as on the other flipper.
- Compare the two flipper assemblies for worn parts, then check the EOS gap and the cabinet switch contacts.
Fix
- Remove whatever stops the plunger reaching the coil stop (here a little of the plastic was filed down) or replace the worn parts, so the plunger seats fully.
Systems
Games
Related tips
- Flipper flutters when held up
- Flipper coil gets very hot
- Flipper weak after a rebuild: EOS opening at the start of the stroke
- Measure a flipper coil
- Right flipper too weak for the top lock after a rebuild: lighter return spring
- Three flipper mechanism generations
- Most flipper faults are EOS switch faults
- Fire a flipper coil by grounding it
Source: Pinball Repair help group!! (Facebook group)