Opto Interrupter

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Troubleshooting Williams/Bally WPC System & System 11.

Opto Interrupter

Opto Interrupters are commonly used in many arcade games e.g. steering assembly in older driving games, scoring switches in Whack A Crock etc. Uninterrupted light beam will turn the phototransistor "ON" connecting the ground to the game board input. When the light beam is interrupted the phototransistor turns "OFF" , the ground is disconnected from the input and the pull-up resistor R1 forces the input to go "HIGH" (5V level).

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