Ricoh M281 Series Service Manual page 449

SC No. Type
SC142-00 D
SM
Error Name/Error Condition/Major Cause/Solution
White level detection error
The white level cannot be adjusted to the target level during auto
gain control.

Condensation in scanner unit

Scanner Carriage defective

BiCU defective

Harness defective

Connector disconnected

White Guide Plate dirty or attachment fault
Check if the SC occurs by turning the power OFF then ON. If the
SC occurs again, do the following steps. Check if the SC
reoccurs by cycling the power after each step.
1. Reconnect the following connectors.

Scanner Carriage – BiCU connector

SBU – LEDB connector (SBU side connector which is
on the scanner carriage)

BiCU – IOB connector
2. Check the white guide plate (exposure glass).
Check the white guide plate attached to the exposure glass.
If the white guide plate is in an unusual state, replace the
white guide plate.
3. Scanner carriage defective
Replace the scanner carriage.
4. BiCU defective
Replace the BiCU.
5. Harness defective
Replace the following harnesses.

Scanner Carriage – BiCU harness

BiCU – IOB harness
6. IOB defective
Replace the IOB.
6-11
Service Call 101-195
D255/D256/M281/M282