• Code: L4-44
• Description: Power cooling fan 2 trouble
• Causes: Harness, connector trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble.
• Remedy: Use Sim6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.

• Code: L4-50
• Description: Process fan 1 trouble
• Causes: Process fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Check that the fan is rotating after turning ON the power. Replace the process fan. Replace the PCU PWB. Check connection of the connector and the harness.

• Code: L4-51
• Description: Process fan 2 trouble
• Causes: Process fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Check that the fan is rotating after turning ON the power. Replace the process fan. Replace the PCU PWB. Check the connector and the harness.

• Code: L4-71
• Description: Process fan 2 trouble
• Causes: PCU PWB trouble
• Remedy: Replace the PCU PWB.

• Code: L4-75
• Description: Paper exit motor trouble
• Causes: PCU PWB trouble. Motor trouble Connection trouble of the connector and the harness between the PCU PWB and the motor.
• Remedy: Check the connector and the harness of the PCU PWB and the motor. Replace the PCU PWB, the motor and the harness.

• Code: L4-76
• Description: Reverse motor trouble
• Causes: PCU PWB trouble. Motor trouble Connection trouble of the connector and the harness between the PCU PWB and the motor.
• Remedy: Check the connector and the harness of the PCU PWB and the motor. Replace the PCU PWB, the motor and the harness.

• Code: L4-77
• Description: ADU motor upper trouble
• Causes: PCU PWB trouble. Motor trouble Connection trouble of the connector and the harness between the PCU PWB and the motor.
• Remedy: Check the connector and the harness of the PCU PWB and the motor. Replace the PCU PWB, the motor and the harness.

• Code: L4-78
• Description: ADU motor bottom trouble
• Causes: PCU PWB trouble. Motor trouble Connection trouble of the connector and the harness between the PCU PWB and the motor.
• Remedy: Check the connector and the harness of the PCU PWB and the motor. Replace the PCU PWB, the motor and the harness.