Testing flipper coil diodes
Steps
- Cut one lead of each diode from the coil lug.
- Meter on diode test, black probe on the banded end: expect 0.4 to 0.6 V. Reversed: no reading.
- Resolder the leads afterwards. FL23/600-30/2600 coils have one diode; FL11630 coils have two.
Systems
Related tips
- Flipper coils have two windings
- Replacing a flipper coil
- How the two windings of a flipper coil work
- Every System 11 flipper has an EOS switch and coil diodes
- How a System 11 flipper coil works
- Removing and checking the flipper coil stop
- Replace an elongated flipper coil bracket
- 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)