Ricoh M281 Series Service Manual page 460

Service Call 490-491
SC No. Type
SC491-02 D
D255/D256/M281/M282
Error Name/Error Condition/Major Cause/Solution
Drum Unit Error

No response from the device in reading/writing for 5 ms or
more and this problem is repeated 5 times consecutively.

The reading data of 2 locations do not match 8 times
consecutively.

The writing data and reading date do not match 8 times
consecutively.

Drum PCB defective

Connect-Left PCB defective

IOB defective

Drum PCB defective
1. Reconnect the following connectors.

Drum PCB – Drum Connection PCB connector

Drum Connection PCB – Connect-Left PCB
connector

Connect-Left PCB – IOB connector
2. If the connector is broken, shorted, or grounded,
replace the connector.
3. Replace the drum unit.

Connect-Left PCB defective
Replace the Connect-Left PCB.

IOB defective
1. Update the engine software to the latest version.
2. Replace the IOB.
6-22 SM