Ricoh A151 Field Service Manual page 234

Check that CN102 and CN104 on the main board are correctly connected.
Correct Incorrect
Connect CN102 and CN104.
Is there 0 volts at CN102-2 on the main board when the 4th/5th mirror H.P.
sensor is deactuated?
No Yes
Replace the main board.
Check whether the dc harness (signal line) for the sensor is defective.
No Yes
Replace the dc harness.
Replace the 4th/5th mirror H.P. sensor.
A151/A152 6-40 FSM