• Code: L4-42
• Description: Ozone fan motor 3 trouble. When the fan is operated, the fan operation signal is not detected within the specified time.
• 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: L4-43
• Description: Paper exit cooling fan R trouble. When the fan is operated, the fan operation signal is not detected within the specified time.
• 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: L4-44
• Description: Power source cooling fan 2 trouble. The lock signal is detected during rotation of the power source cooling fan 2.
• Causes: Harness/connector trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan does not rotate because of the other trouble. (No power supply to the fan motor)
• 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: L4-48
• Description: ADU transport cooling fan motor F trouble. The lock signal is detected during rotation of the ADU transport cooling fan motor F
• Causes: Harness/connector trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan does not rotate because of the other trouble. (No power supply to the fan motor)
• 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: L4-49
• Description: ADU transport cooling fan motor R trouble. The lock signal is detected during rotation of the ADU transport cooling fan motor R.
• Causes: Harness/connector trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan does not rotate because of the other trouble. (No power supply to the fan motor)
• 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: L4-56
• Description: Paper exit cooling fan2 R trouble. When the fan is operated, the fan operation signal is not detected within the specified time.
• 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: L4-57
• Description: Toner bottle cooling fan motor trouble. The fan operation signal is not detected within the specified time in the toner bottle cooling fan 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 motor. Check that the fan is rotating after turning ON the power.

• Code: L4-58
• Description: Paper exit cooling fan2 trouble. When the fan is operated, the fan operation signal is not detected within the specified time.
• 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.