Remedy: Check that the EEPROM is properly set. Clear trouble with SIM 16. Replace the MCU PWB. Remarks EEPROM abnormality
Code: U2-20
Description: Machine speed code data error The machine (Boot) speed information is not identical to the model code speed information.
Causes: EEPROM defective SIM operation error
Remedy: Check that the machine set with SIM 26- 57 is identical to the model information. Remarks When the boot program speed code does not match with the body model information.
Code: U2-40
Description: CRUM chip communication error Error in MCU-CRUM chip communication
Remedy: Replace the CRUM chip. Check installation of the developing unit. Clear the trouble with SIM 16. Replace the MCU PWB. Remarks CRUM communication error
Code: U7-00
Description: RIC communication trouble Error in communication with RIC Error in communication test after turning on the power or canceling SIM.
Causes: Connector harness contact trouble or disconnection RIC control PWB trouble MCU PWB failure Malfunction by noises
Remedy: Check the communication cable, connectors from the RIC box to the main body.
Code: U9-00
Description: MCU-OPE communication trouble Communication establishment error/ framing/parity/protocol error
Causes: Operation control PWB connector disconnection Operation control PWB MCU PWB harness failure
Remedy: Check the connectors and harness of the operation control PWB and MCU PWB. Check the grounding of the copier. Check ROM on the operation control PWB.
Code: U9-80
Description: Operation control PWB communication trouble (Protocol) Communication trouble between MCU and the operation control PWB (Protocol error)
Causes: Operation control PWB connector disconnection Operation control PWB MCU PWB harness failure
Remedy: Check the connectors and harness of the operation control PWB and MCU PWB. Check the grounding of the copier.