System 3-7 flipper coils are series wound
These coils have three lugs: the middle lug is common to both windings, and one diode runs across the two outer lugs (band to the power lug). The power winding is a few turns of thick wire, the hold winding many turns of thin wire. No EOS capacitor is used; one has no effect on a series-wound coil. Williams moved to parallel-wound coils with two diodes and a 2.2 MFD EOS capacitor from F-14 Tomcat (1987).
Systems
Related tips
- Measure a flipper coil
- Fire a flipper coil by grounding it
- Improving first-generation System 3/4 flippers
- Matching a replacement flipper coil by resistance
- WPC flipper coils, weakest to strongest
- Replacing a flipper coil
- 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)