Ricoh M281 Series Service Manual page 459

SC No. Type
SC491-01 D
SM
Error Name/Error Condition/Major Cause/Solution
Drum Unit Type Mismatch Error

Cannot communicate with the EEPROM of the drum PCB
normally.

An incompatible drum unit is installed.

Connector defective or disconnected

Drum PCB defective

Connect-Left PCB defective

IOB defective

Connector defective or disconnected
Reconnect the following connectors. Then perform a
conduction inspection. If there is no conduction, replace the
connector.

Drum Unit – Drum Connection PCB connector

Drum Connection PCB – Connect-Left PCB connector

Connect-Left PCB – IOB connector

Drum PCB defective
Replace the drum PCB.

Connect-Left PCB defective
Replace the Connect-Left PCB.

IOB defective
Replace the IOB.
6-21
Service Call 490-491
D255/D256/M281/M282