The left flipper quit in the middle of a game. Grounding the coil lug fires the good flipper but not this one, and one pair of coil lugs reads open.
One flipper dead: open reading across the hold winding was a bad solder joint
Cause: A poor solder joint on the coil lugs. (A flipper coil is two windings in one: the low-ohm power winding and the hold winding, which reads 0 ohms while the EOS switch is closed and a few hundred ohms with it open.)
Checks
- Compare the coil readings with the good flipper, holding the EOS switch open to read the hold winding.
- Look closely at the solder joints on the coil lugs.
Fix
- Desolder and resolder the coil wires; rebuild worn parts (bushing, pawl, plunger, EOS switch) while it's apart.
Systems
Games
Related tips
- One flipper dead with full voltage at the coil: cracked joints at the flipper relay
- Both right flippers dead, left works: wire at a coil lug not making contact
- Upper flipper weak and won't hold: second leaf switch on the lower flipper not touching
- Flipper won't kick but holds if lifted by hand: dirty or worn EOS switch
- Right flipper dead though coil and switches test fine: cracked joint on a backbox board
- Both right flippers dead with power present: dirty cabinet button contacts
- Small upper flipper fires repeatedly and drops: EOS contact tension
- One flipper dead with fuses good
Source: Pinball Repair help group!! (Facebook group)