Ricoh M281 Series Service Manual page 450

Service Call 101-195
SC No. Type
SC144-00 D
D255/D256/M281/M282
Error Name/Error Condition/Major Cause/Solution
SBU Communication Error

The machine cannot detect that the Scanner Carriage is
connected.

The machine cannot communicate with the Scanner
Carriage, or the communication data is incorrect.

The configuration of FPGA is not completed.
Error detection timing: At the time of applying power source
for scanner (when the main power is turned ON or when the
machine returns from energy save mode)

Scanner Carriage defective

BiCU defective

IOB defective

Harness 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. IOB defective
Replace the IOB.
5. Harness defective
Replace the following harnesses.

Scanner Carriage – BiCU harness

BiCU – IOB harness
6-12 SM