This works on every photointerrupter:
Leave it plugged into the copier and powered ON. Use you're meter on 5vdc range. Meter each pin to frame ground. There are (3) pins:
ground: 0.0vdc
supply voltage: 5.0vdc
output: 0.2 to 5.0vdc, depending if the sensor is blocked or unblocked
Simple! =^..^=
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