• Code: L4-34
• Description: Polygon cooling fan trouble
  The motor lock signal is detected during rotation of the polygon cooling fan.
• 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: L4-36
• Description: Toner suction fan trouble
  The motor lock signal is detected during rotation of the toner suction fan.
• 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: Reverse transport cooling fan trouble
  The motor lock signal is detected during rotation of the reverse transport cooling fan.
• 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: L4-39
• Description: Reverse cooling fan trouble
  The motor lock signal is detected during rotation of the reverse cooling fan.
• 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: L4-40
• Description: Ozone fan motor 1 trouble
  The lock signal is detected during rotation of the ozone fan motor 1.
• 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: L4-41
• Description: Ozone fan motor 2 trouble
  The lock signal is detected during rotation of the ozone fan motor 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: L4-43
• Description: Paper cooling fan trouble
  The motor lock signal is detected during rotation of the paper cooling fan.
• 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: L4-46
• Description: Development cooling fan 1 trouble
  The lock signal is detected during operation of the developing cooling fan
• Causes: Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
• 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. Replace the PCU PWB. Replace the fan motor.