• Code: L4-17
• Description: Drum motor lock trouble (BK)
• 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: L4-29
• Description: HDD Cooling fan motor trouble
• Causes: Fan motor trouble. Harness connection trouble between the PCU PWB and the fan motor. Control circuit trouble.
• Remedy: Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor.

• Code: L4-31
• Description: Paper exit cooling fan motor 5 trouble
• 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 motor 1 trouble
• 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.

• Code: L4-34
• Description: LSU cooling fan motor trouble
• Causes: When the LSU cooling fan is operated, the fan operation signal is not detected within the specified time. LSU fan trouble. Harness, connector trouble. LSU control PWB trouble.
• Remedy: Use SIM6-2 to check the fan operation. Check the LSU fan, and replace if necessary. Check the harness/connector, and replace if necessary. Check the LSU control PWB, and replace if necessary.

• Code: L4-35
• Description: Paper exit cooling fan motor 4 trouble
• 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: L4-38
• Description: Paper exit cooling fan motor 3 trouble
• 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: 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: L4-39
• Description: Fuser cooling fan motor 1 trouble
• 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.