The flipper coil overheats when held up.
Flipper coil gets very hot
Cause: The EOS switch is not opening at full stroke, or the hold winding is broken.
Checks
- At full stroke the EOS should open by about 1/8"; check the contacts are clean.
- Measure the hold winding.
Fix
- Adjust and file the EOS switch; replace a coil with a broken hold winding.
Systems
Related tips
- Measure a flipper coil
- Fire a flipper coil by grounding it
- System 3-7 flipper coils are series wound
- Fitting parallel-wound flipper coils
- Matching a replacement flipper coil by resistance
- WPC flipper coils, weakest to strongest
- Williams 50 V fat flipper coils ranked by strength
- Power at the flipper coil but no flip
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)