Code :

Code: L4-16
Description: Fusing pressure release trouble. A change in the fusing pressure release sensor signal cannot be detected within the specified time after outputting the fusing pressure release motor.
Causes: Fusing pressure release sensor trouble. Fusing pressure release motor trouble. Pressure release drive gear and pressure release idle gear trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
Remedy: Replace the fusing pressure release sensor. Replace the fusing pressure release motor. Replace the pressure release drive gear and the pressure release idle gear. Replace the PCU PWB. Check connection of the connector and the harness.

Code: L4-17
Description: Drum motor lock trouble (K). The motor lock signal is detected during rotation of the drum motor (K).
Causes: Drum motor trouble Harness connection trouble between the PCU PWB and the drum motor Control circuit trouble
Remedy: Use SIM25-01 to check the operation of the drum motor. Check the harness and the connector between the PCU PWB and the developing motor. Replace the PCU PWB. Replace the drum motor.

Code: L4-18
Description: Drum motor lock trouble (C) The motor lock signal is detected during rotation of the drum motor (C).
Causes: Drum motor trouble Harness connection trouble between the PCU PWB and the drum motor Control circuit trouble
Remedy: Use SIM25-01 to check the operation of the drum motor. Check the harness and the connector between the PCU PWB and the developing motor. Replace the PCU PWB. Replace the drum motor.

Code: L4-19
Description: Drum motor lock trouble (M) The motor lock signal is detected during rotation of the drum motor (M).
Causes: Drum motor trouble Harness connection trouble between the PCU PWB and the drum motor Control circuit trouble
Remedy: Use SIM25-01 to check the operation of the drum motor. Check the harness and the connector between the PCU PWB and the developing motor. Replace the PCU PWB. Replace the drum motor.

Code: L4-20
Description: Drum motor lock trouble (Y) The motor lock signal is detected during rotation of the drum motor (Y).
Causes: Drum motor trouble Harness connection trouble between the PCU PWB and the drum motor Control circuit trouble
Remedy: Use SIM25-01 to check the operation of the drum motor. Check the harness and the connector between the PCU PWB and the developing motor. Replace the PCU PWB. Replace the drum motor.

Code: L4-30
Description: MFP cooling fan / HDD cooling fan trouble. The motor lock signal is detected during rotation of the MFP cooling fan or HDD cooling fan.
Causes: Fan motor trouble, controller PWB trouble, SCNMother PWB trouble, fan motor/SCN-Mother PWB harness connection trouble, controller PWB/SCNMother PWB connection trouble, control circuit trouble
Remedy: Use SIM06-02 to check the operation of the fan motor. Check the controller PWB, the SCN-Mother PWB, and the harness and the connector between the fan motor and the SCN-Mother PWB.

Code: L4-31
Description: Paper exit cooling fan F trouble. The fan operation signal is not detected within the specified time in the paper exit cooling fan F operation.
Causes: The fan does not rotate because of disconnection of the fan connector or other trouble.
Remedy: Check the harness and the connector between the PCU PWB and the fan. Use SIM6-2 to check that the fan is actually rotating.

Code: L4-32
Description: Power source cooling fan 1 trouble. The fan operation signal is not detected within the specified time in the power cooling fan 1 operation.
Causes: The fan does not rotate because of disconnection of the ozone exhaust fan or other trouble.
Remedy: Check the harness and the connector between the PCU PWB and the fan. Use SIM6-2 to check that the fan is actually rotating.