Flipper EOS switch: gap, checking and cleaning

The EOS switch should be firmly closed at rest and open about 1/8 inch only at the very end of the stroke. Check it by pushing the plunger fully into the coil, not by moving the bat, because linkage slop gives a false reading. If it fails to open, the power winding stays on and the coil burns. Its contacts are tungsten: clean them and the cabinet switch with a metal file, not a flexstone.

Systems

• Electro-mechanical

Related tips

• How an EM flipper coil and its EOS switch work
• Cleaning and adjusting the cabinet flipper switch
• Flipper still weak after a rebuild: wiring and contacts
• Flipper coil burns or solenoid fuse blows: EOS switch
• Weak flippers on an EM: adjust the end-of-stroke switch before buying coils
• Which games have zipper flippers
• Flippers still weak after a rebuild kit: clean the new EOS contacts
• Flipper stays up after the button is released

Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part Two, Clay Harrell (pinrepair.com)