Proximity Sensor II Assy.

Proximity Sensor II board assembly for Williams STAR TREK THE NEXT GENERATION pinball machine.

Reference:

• A-16922-1
• Use A-18543.1-2 as a replacement
• 
  Installation and adjustment:
• 1) Place the board in the location in the machine. Use a single screw to hold it in place while you test.
• 2) Connect the 4-pin (switch matrix) and 2-pin (sensor) connectors.
• 3) Turn the machine on.
• 4) Using a small screwdriver, turn the pot from end to end. It will rotate through about 3/4 of a turn.
• ) At one end, the LED will go on. When that happens, slowly turn the pot the in the opposite direction until the LED goes off.
• If the LED does not go off, your sensor or its wiring have a problem.
• 6) Place a ball on the top of the playfield in the sensor area. The LED should light when the ball rolls over the sensor.