Ricoh M281 Series Service Manual page 447

SC No. Type
SC120-00 D
SM
Error Name/Error Condition/Major Cause/Solution
Scanner Home Position error
The home position is not correct when the main power is turned
ON, at the end of a reading process from the exposure glass
and ARDF.

Scanner motor defective

Scanner HP sensor defective

SBU defective

BiCU defective

Controller board defective

Scanner motor defective
1. Move the scanner carriage by hand to check whether it
is unusually difficult to move.
2. Check that the scanner driving belt is not disengaged.
3. Reconnect the following connector.
Scanner Motor – Controller Board connector
4. If the connector is broken, shorted, or grounded,
replace the connector.
5. Replace the scanner motor.

Scanner HP sensor defective
1. Check that the scanner HP sensor is correctly
positioned.
2. Reconnect the following connectors.

Scanner HP Sensor – SBU connector

SBU – Controller Board connector
3. Replace the scanner HP sensor.

SBU defective
Replace the scanner unit.

BiCU defective
Replace the BiCU.

Controller board defective
Replace the controller board.
6-9
Service Call 101-195
D255/D256/M281/M282