Most flipper faults are EOS switch faults
Every System 3-7 flipper has a normally closed end-of-stroke switch that drops out the high-power winding at full stroke. A broken or badly adjusted EOS gives weak flippers or burnt coils, so fix it first.
Systems
Related tips
- Games with an upper flipper switch on the EOS stack
- EOS switch must be normally closed with tungsten contacts
- Flipper weak after a rebuild: EOS opening at the start of the stroke
- Right flipper too weak for the top lock after a rebuild: lighter return spring
- Firepower right flipper switches sit close to the pawl: a short kills the switch matrix
- Flipper fuse blows
- Where flipper power comes from
- Measure a flipper coil
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)