Remedy: Replace the CRUM chip. Check installation of the developing unit. Clear the trouble with SIM 16. Replace the MCU PWB.
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 the 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 the harness of the operation control PWB and MCU PWB. Check the grounding of the copier.
Code: U9-81
Description: Operation control PWB communication trouble (Parity) Communication trouble between MCU and the operation control PWB (Parity error)
Causes: Operation control PWB connector disconnection Operation control PWB MCU PWB harness failure
Remedy: Check the connectors and the harness of the operation control PWB and MCU PWB. Check the grounding of the copier.
Code: U9-82
Description: Operation control PWB communication trouble (Overrun) Communication trouble between MCU and the operation control PWB (Overrun error)
Causes: Operation control PWB connector disconnection Operation control PWB MCU PWB harness failure
Remedy: Check the connectors and the harness of the operation control PWB and MCU PWB. Check the grounding of the copier.