Flippers have gradually become weak.
Weak flippers from pitted EOS switches
Cause: The tungsten EOS contacts arc, pit and build resistance, which causes more arcing. Worst on the series coils of High Speed to Millionaire.
Fix
- File the contacts flat with a small point file until no pitting remains.
- Set about a 1/8 in gap with the flipper fully up.
- Replace a badly worn switch (part 03-7811).
Work on EOS switches with the game off; they carry 50 V.
Systems
Related tips
- Flipper coil burns or flipper very weak after a rebuild
- Flipper rebuild part numbers for System 11
- Coil sleeves and flipper rebuild spares
- Converting System 3-7 flippers to WPC-style mechanisms: main parts
- Every System 11 flipper has an EOS switch and coil diodes
- Weak flipper: rectifier or worn parts
- Weak flipper: dirty end-of-stroke switch
- Sluggish flipper with nothing binding: EOS switch not closed at rest
Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Three, Clay Harrell