Pre-Fliptronics EOS and cabinet switches: file clean, open about 1/8"

Clean the high-voltage tungsten contacts of the cabinet flipper switches and the normally closed EOS switch with a small file. The EOS should open about 1/16" to 1/8" at full stroke; a dirty or open EOS can stop the flipper entirely, and a misadjusted one weakens it.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix

Related tips

• EOS switch: normally closed on older games, normally open on Fliptronics
• End-of-stroke switches: pre-Fliptronics versus Fliptronics
• Flipper buttons not seen by the game (pre-Fliptronics)
• Contact files only on flipper switches
• Pre-Fliptronics flipper coil wiring
• Pre-Fliptronics: weak flipper
• Weak flippers on a pre-Fliptronics WPC game: pitted EOS contacts
• Pre-Fliptronics games need a driver board with the flipper relay

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Two, Clay Harrell (pinrepair.com)