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Troubleshooting Williams/Bally WPC System & System 11. 

Two or more balls kicked to the playfield or the machine keeps kicking one ball after another.

Complaints that two balls were kicked to the playfield instead of one, or the balls are continuously kicked to the playfield means problem with the trough assembly opto switches. Check them in the Switch Edges Test. The test should indicate all trough switches closed if the balls are removed from the playfield. Don’t forget to check the "Upper Trough Switch" (Ball Jam Switch). This switch is often overlooked. Trough problems are often intermittent. Introduce bit of vibration to the transmitter and the receiver board. Tap them with the handle of your screwdriver. The switch Edges Test will indicate the switch which fails under vibration. Tap also the connectors. Machines around the time of Indiana Jones had problems with resistors and LED's on the transmitter board breaking off.

If a particular trough switch is not working measure the voltage directly across the LED. If you measure 0V it most likely means that the resistor is open circuit or not connected to the LED. If you measure around 12V, the LED is open circuit or not connected - replace it. Around 1.2V is the correct voltage.


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