The Ringmaster's eddy sensor works for a few games and then stops registering hits until the game is switched off and on again. A replacement eddy board registered false hits.
Ringmaster sensor stops registering until power cycle: repin the eddy board
Cause: Poor contact in the small connectors feeding the eddy sensor board.
Checks
- In switch test, pass a ball or a steel tool near the sensor and watch whether it registers consistently.
- Inspect the 2-pin and 4-pin connectors on the eddy sensor board for fatigued or loose pins.
Fix
- Repin the 2-pin and 4-pin connectors on the eddy sensor board with new crimp pins.
- Re-test; with good connectors, the replacement eddy board worked reliably here.
Systems
Games
Related tips
- Second-generation auto-adjust eddy sensors (1996-1998)
- Playfield, DMD and flippers go dead mid-game: burnt AV board power connector
Source: Pinball Repair help group!! (Facebook group)