Description: Counter check sum error
Counter check sum value stored in the EEPROM is abnormal.
Causes: EEPROM failure Control circuit hung up by noises MCU PWB EEPROM access circuit defect
Code: U2-12
Description: Adjustment value check sum error (EEPROM)
Adjustment value data area check sum error
Causes: EEPROM failure Control circuit hung up by noises MCU PWB EEPROM access circuit failure
Code: U2-40
Description: CRUM communication error
Toner cartridge CRUM data read error
Causes: A toner cartridge of a different destination is installed. EEPROM trouble Check the destination setup. Toner cartridge CRUM PWB trouble MCU PWB trouble CRUM connector disconnection
Code: U3-29
Description: Mirror base home position error
Home position is not detected when starting mirror base shift.
Causes: Mirror unit defect Mirror home position sensor defect MCU PWB decfect Scanner wire disconnection
Code: U9-00
Description: Communication trouble between MCU and OPE (OPE detection)
Communication setup error, framing, parity, protocol error
Causes: Operation control PWB connector disconnection Operation control PWB MCU PWB harness failure