​Williams/Bally pinball machine 3 inch by 1.25 inch adjustable Eddy Sensor Replacement Board for different Pinball Machines.

Reference part numbers: A-16922, A-18543-1, A-18543.1-2, A-18543-2

Resistors included! Install the correct resistor to match your game:
R1 = 0 Ohm for use in the Twilight Zone
R1 = 4.7 kOhm for use as a sensor board for most games

Installation:
Place the board in the location in the machine. Use a single screw to hold it in place while you test.
Connect the 4-pin (switch matrix) and 2-pin (sensor) connectors.
Turn the machine on.
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.
Place a ball on the top of the playfield in the sensor area. The LED should light when the ball rolls over the sensor.

Used in:
1994 ROAD SHOW (Williams)
1995 THEATRE OF MAGIC (Bally)
1993 TWILIGHT ZONE (Bally)
1996 SCARED STIFF (Bally)
1993 STAR TREK THE NEXT GENERATION (Williams)