Flippers get progressively weaker on Funhouse to Terminator 2 era games.

Weak flippers on a pre-Fliptronics WPC game: pitted EOS contacts

Cause: The high voltage EOS contacts arc, pit and burn; rising resistance makes more arcing, until the flippers are very weak.

Checks

• Inspect the EOS tungsten contacts for pitting.

Fix

• File the contacts clean with a point file as routine maintenance; check the arc capacitor.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix

Related tips

• Pre-Fliptronics: weak flipper
• Measuring a pre-Fliptronics flipper coil and its EOS switch
• Pre-Fliptronics flipper coil wiring
• WPC flipper rebuild kits by era
• Pre-Fliptronics games need a driver board with the flipper relay
• Pre-Fliptronics: a flipper does nothing
• Pre-Fliptronics: flippers work even with no game running
• Pre-Fliptronics EOS and cabinet switches: file clean, open about 1/8"

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