A flipper coil overheats, or the flipper is extremely weak.

Flipper coil burns or flipper very weak after a rebuild

Cause: An EOS switch that stays closed lets the power winding stay on and burn the coil; a dirty EOS switch makes the flipper weak.

Fix

• File the EOS contacts until no pitting is left.
• Adjust it to open about 1/8 in at the end of the stroke.
• Replace a badly worn switch.

Adjust EOS switches with the game off.

Systems

• Williams System 11
• Williams System 11A
• Williams System 11B
• Williams System 11C

Related tips

• Flipper rebuild part numbers for System 11
• Weak flippers from pitted EOS switches
• Coil sleeves and flipper rebuild spares
• Converting System 3-7 flippers to WPC-style mechanisms: main parts
• New flipper coil overheats and burns
• Flipper coil gets very hot
• Flipper coils have two windings
• How the two windings of a flipper coil work

Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Three, Clay Harrell