Ricoh M281 Series Service Manual page 448

Service Call 101-195
SC No. Type
SC141-00 D
D255/D256/M281/M282
Error Name/Error Condition/Major Cause/Solution
Black level detection error
The black level cannot be adjusted to the target level at the time
of applying power source for scanner (when the main power is
turned ON).

Scanner Carriage defective

BiCU defective

Harness defective

IOB defective
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

BiCU – IOB connector
2. Scanner carriage defective
Replace the scanner carriage.
3. BiCU defective
Replace the BiCU.
4. Harness defective
Replace the following harnesses.

Scanner Carriage – BiCU harness

BiCU – IOB harness
5. IOB defective
Replace the IOB.
6-10 SM