The left flipper occasionally does nothing on a button press, then works on the next press. A new cabinet flipper switch did not help.
Flipper sometimes ignores the first button press: replace the EOS switch
Cause: A faulty end-of-stroke (EOS) switch on the flipper. It looked like it was making proper contact after cleaning but was not working correctly.
Checks
- Inspect the EOS switch gap and contacts on the flipper assembly; check that the flipper's power stroke opens it only at the end of travel.
Fix
- Replace the EOS switch and set its gap.
Systems
Games
Related tips
- Flipper won't kick but holds if lifted by hand: dirty or worn EOS switch
- GI dims whenever the left flipper button is held: upper left flipper EOS not opening
- Upper flipper flutters, then dies: pitted EOS contacts
- Upper flipper weak and won't hold: second leaf switch on the lower flipper not touching
- Solenoid fuse blows when a flipper is used: worn spacer in the EOS switch stack
- Flippers dead though fuses and EOS switches are good
- Two upper flippers die after cleaning EOS switches: readjust the break-make pairs
- Both right flippers dead with power present: dirty cabinet button contacts
Source: Pinball Repair help group!! (Facebook group)