• Code: L4-35
• Description: Fusing exhaust fan (VFM-BKR) trouble
• Causes: The fan operation signal is not detected within the specified time in the fusing exhaust fan operation.
  Fusing exhaust fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Check connection of the connectors and the harness. Use SIM6-2 to check the operation of the fan motor. Replace the fusing exhaust. Replace the PCU PWB.

• Code: L4-38
• Description: Fusing section cooling fan (CFM-U4) trouble
• Causes: The fan operation signal is not detected within the specified time in the fusing section cooling fan operation. Fusing section cooling fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Check connection of the connectors and the harness. Use SIM6-2 to check the operation of the fan motor. Replace the fusing section cooling fan. Replace the PCU PWB.

• Code: L4-40
• Description: Process exhaust fan (VFM-EX1/2/3) trouble
• Causes: The fan operation signal is not detected within the specified time in the process exhaust fan operation. Process exhaust fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Check connection of the connectors and the harness. Use SIM6-2 to check the operation of the fan motor. Replace the process exhaust fan. Replace the PCU PWB.

• Code: L4-43
• Description: Paper cooling fan trouble
• Causes: The fan operation signal is not detected within the specified time in the paper cooling fan operation. Paper cooling fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Check connection of the connector and the harness. Use SIM6-2 to check the operation of the fan motor. Replace the paper cooling fan. Replace the PCU PWB.

• Code: L4-46
• Description: Developing section cooling fan (CFM-DV) trouble
• Causes: The fan operation signal is not detected within the specified time in the developing section cooling fan operation. Developing section cooling fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Check connection of the connector and the harness. Use SIM6-2 to check the operation of the fan motor. Replace the developing section cooling fan. Replace the PCU PWB.

• Code: L4-50
• Description: Process cooling fan (CFM-R1/2/3) trouble
• Causes: The fan operation signal is not detected within the specified time in the process cooling fan operation. Process cooling fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Check connection of the connector and the harness. Use SIM6-2 to check the operation of the fan motor. Replace the process cooling fan. Replace the PCU PWB.

• Code: L4-56
• Description: Fusing section cooling fan (CFM-U2) trouble
• Causes: The fan operation signal is not detected within the specified time in the fusing section cooling fan operation. Fusing section cooling fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Check connection of the connectors and the harness. Use SIM6-2 to check the operation of the fan motor. Replace the fusing section cooling fan. Replace the PCU PWB.

• Code: L4-58
• Description: Process exhaust fan (VFM-BKL) trouble
• Causes: The fan operation signal is not detected within the specified time in the process exhaust fan operation. Process exhaust fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Check connection of the connectors and the harness. Use SIM6-2 to check the operation of the fan motor. Replace the process exhaust fan. Replace the PCU PWB.