Checking flipper buttons and EOS switches in switch test
Steps
- Enter diagnostics and pick Test Switch Edges.
- Flipper buttons and EOS switches are direct inputs, shown in the column outside the matrix box at the right.
- From top to bottom that column is: lower right EOS, lower right button, lower left EOS, lower left button, upper right EOS, upper right button, upper left EOS, upper left button.
- Pressing a button or closing an EOS should turn its circle into a square.
- If an EOS does not register, buzz its wiring: pre-WPC-95 EOS switches go to Fliptronics board J906 and the flipper optos to J905; on WPC-95 EOS switches go to CPU board J208 and the flipper switches to J212.
Systems
Related tips
- Weak or dead flippers from failing LM339s on the Fliptronics board
- How Fliptronics flippers work
- Where flipper, EOS and test switches connect
- Fliptronics: flipper coil gets hot after a while of play
- Fliptronics and WPC-95: weak flipper
- Flipper stuck up but drops when the power goes off
- Flippers and magnet weak after rebuilds: replace the Fliptronics board
- All flippers kick once at game start and then go dead
Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Two, Clay Harrell (pinrepair.com)