• Code: L4-30
• Description: MFP fan motor trouble
  The motor lock signal is detected during rotation of the MFP fan motor.
• Causes: Fan motor trouble. Harness connection trouble between the MFPC PWB and the fan motor. MFP circuit trouble.
• Remedy: Use SIM6-2 to check the rotating operation of the fan. Check the harness and the connector between the MFPC PWB and the fan motor.

• Code: L4-31
• Description: Paper exit cooling fan trouble
  The fan operation signal is not detected.
• Causes: Paper exit 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 rotating operation of the fan. Replace the paper exit cooling fan. Replace the PCU PWB.

• Code: L4-32
• Description: Power source cooling fan trouble
  The fan operation signal is not detected.
• Causes: Power cooling fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Use SIM6-2 to check that the fan is actually rotating. Replace the power cooling fan. Replace the PCU PWB. Check connection of the connectors and the harness.

• Code: L4-35
• Description: Fusing cooling fan trouble
  The fan operation signal is not detected.
• Causes: Fusing cooling fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Use SIM6-2 to check that the fan is actually rotating. Replace the fusing cooling fan. Replace the PCU PWB. Check connection of the connector and the harness.

• Code: L4-43
• Description: Paper exit cooling fan 2 trouble
  The fan operation signal is not detected.
• Causes: Paper exit cooling fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Replace the fan. Replace the PCU PWB. Check the connector and the harness. Use SIM6-2 to check that the fan is actually rotating.

• Code: L4-44
• Description: Power cooling fan 2 trouble
  The lock signal is detected while the power cooling fan is operating.
• Causes: Power cooling fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Use SIM6-2 to check that the fan is actually rotating. Replace the power cooling fan. Replace the PCU PWB. Check the connector and the harness.

• Code: L4-56
• Description: Fusing cooling fan 2 trouble
  The fan operation signal is not detected.
• Causes: Fusing cooling fan 2 trouble PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Use SIM6-2 to check that the fan is actually rotating. Replace the fusing cooling fan. Replace the PCU PWB. Check the connector and the harness.

• Code: L6-10
• Description: Polygon motor trouble
  The polygon motor does not reach the specified RPM within the specified time after starting rotation of the polygon motor.
• Causes: Polygon motor trouble. LSU mother PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Use SIM61-1 to check the operation of the polygon motor. Check connection of the connector and the harness. Replace the LSU. Replace the LSU mother PWB.