Master Sensor Circuit - Ricoh M5 Service Manual

3. Master Sensor Circuit

Main Board
The main board applies +5 volts from CN1 02-12 to CN709-1 of the master sensor. A
sensor is off, +5 volts is present at CN102-13.
passes under the sensor, the phototransistor turns on and CN102-13 drops to O volts.
– Service Call Condition –
The CPU also uses the master sensor to detect master malfunctions.
If the phototransistor does not turn on within 7.5 seconds after the Start key is pressed, the CPU
stops the copier and lights self-diagnostic code E7.
the master unit is not in the copier.
However, when the sensor plate on the master belt
The same service call condition occurs when
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May, 25, 1985
long as the
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