Every System 11 flipper has an EOS switch and coil diodes
All flippers have a normally closed end-of-stroke (EOS) switch that cuts the power winding at full stroke; a broken one causes trouble and should always be fixed. System 11 flipper coils carry their diodes on the coil itself, so check their orientation against the wiring layout.
Systems
Related tips
- Testing flipper coil diodes
- How a System 11 flipper coil works
- Series and parallel wound flipper coils on System 11
- EOS capacitor for parallel wound flipper coils
- Weak flippers from pitted EOS switches
- Flipper coils have two windings
- How the two windings of a flipper coil work
- FL11630 flipper coil wiring and diode layout (F-14 Tomcat and later)
Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Two, Clay Harrell (pinrepair.com)