Adjusting an STNG, Theatre of Magic or Roadshow eddy sensor
Steps
- Find the eddy sensor control board under the playfield; it has a trim pot and an LED.
- Turn the pot counter-clockwise until the LED just comes on.
- Turn it back clockwise until the LED just goes off.
- Test in the first switch test by moving a ball over the sensor area: the switch should register, and the board LED should light as the ball passes (the LED works outside test mode too).
Systems
Games
Related tips
- Eddy board LED will not turn off at any pot setting
- Cannon won't turn on the third multiball shot though it tests fine: flaky opto wire
- All playfield optos dead after replacing one opto: failed 16-opto board
- Turn ends while a ball is still in play in Final Frontier: flaky trough opto
- Indiana Jones to Demolition Man games have two LM339 opto boards
- Theatre of Magic F903/F904 power the magnets
- Roadshow: bulldozer blade won't go up in play
Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Three, Clay Harrell (pinrepair.com)