• Code: L3-00
• Description: Mirror return trouble
  Mirror return is not completed within the specified time.
• Causes: Mirror unit trouble, mirror wire disengagement
• Remedy: Use SIM1-1 to check the mirror operation.

• Code: L4-02
• Description: Paper feed motor lock trouble
  When the paper feed motor is rotated in warming up or in canceling a jam and the lock signal is not detected within 1sec.
• Causes: Paper feed motor trouble, harness connection trouble between PCU PWB and paper feed motor, control circuit trouble
• Remedy: Use SIM6-1 to check the paper feed motor operation. Check the harness and the connector between the PCU PWB and the paper feed motor.

• Code: L4-04
• Description: Developing motor trouble (BLACK)
  The motor lock signal is detected during rotation of the developing motor.
• Causes: Harness connection trouble between the PCU PWB and the developing motor. Developing motor trouble, control circuit trouble
• Remedy: Case 1 Cause Harness connection trouble between the PCU PWB and the developing motor. Check and remedy Check the harness and the connector between the PCU PWB and the developing motor. Case 2 Cause Developing motor trouble, control circuit trouble Check and remedy Use SIM25-1 to check the operation of the developing motor.

• Code: L4-05
• Description: Developing motor trouble (COLOR)
  The motor lock signal is detected during rotation of the developing motor.
• Causes: Harness connection trouble between the PCU PWB and the developing motor Developing motor trouble, control circuit trouble
• Remedy: Case 1 Cause Harness connection trouble between the PCU PWB and the developing motor. Check and remedy Check the harness and the connector between the PCU PWB and the developing motor. Case 2 Cause Developing motor trouble, control circuit trouble Check and remedy Use SIM25-1 to check the operation of the developing motor.

• Code: L4-06
• Description: Transfer belt separation position sensor trouble
  When separating the primary transfer belt unit, change in the separation position sensor characteristics is not detected within the specified time.
• Causes: Harness connection trouble between the PCU PWB and the separation position sensor The belt position sensor is not interrupted or it is always interrupted. Belt separation clutch operation trouble The primary transfer belt unit is not installed
• Remedy: Case 1 Cause Harness connection trouble between the PCU PWB and the separation position sensor Check and remedy Check the harness between the PCU PWB and the separation position sensor. Case 2 Cause The belt position sensor is not interrupted or it is always interrupted. Belt separation clutch operation trouble Check and remedy Use SIM6-3 to check the belt separation operation. Case 3 Cause The primary transfer belt unit is not installed. Check and remedy Install the primary transfer belt.

• Code: L4-11
• Description: Shift motor trouble
  When the shift motor is initialized, no characteristics change of the shifter home position sensor is not detected within the specified time.
• Causes: Shift motor trouble Harness connection trouble between the PCU PWB and the shift motor, control circuit trouble When the finisher is installed with the finisher connector disconnected and when the finisher communication trouble occurs.
• Remedy: Case 1 Cause Shift motor trouble Check and remedy Use SIM6-1 to check the operation of the shift motor. Case 2 Cause Harness connection trouble between the PCU PWB and the shift motor, control circuit trouble Check and remedy Use SIM30-1 to check the shifter home position sensor. Check the harness and the connector between the PCU PWB and the shift motor. Case 3 Cause When the finisher is installed with the finisher connector disconnected and when the finisher communication trouble occurs. Check and remedy Connect the finisher connector. When the communication trouble occurs between the PCU and the finisher, refer to the content of F1-00.

• Code: L4-30
• Description: Controller fan/HDD fan motor trouble
  1) The motor lock signal is detected during rotation of the controller fan motor. 2) The motor lock signal is detected during rotation of the HDD fan motor.
• Causes: Fan motor trouble Harness connection trouble between the mother PWB and the fan motor. Control circuit trouble Mother PWB trouble.
• Remedy: Case 1 Cause Fan motor trouble Check and remedy Use SIM6-2 to check the operation of the fan motor. Case 2 Cause Harness connection trouble between the mother PWB and the fan motor. Check and remedy Check the harness and the connector between the mother PWB and the fan motor. Case 3 Cause Control circuit trouble Check and remedy Replace the controller PWB. Case 4 Cause Mother PWB trouble. Check and remedy Replace the mother PWB.

• Code: L4-31
• Description: Paper exit cooling fan trouble
  When the paper exit cooling fan is operated, the fan operation signal is not detected within the specified time.
• Causes: Fan connector disconnection Fan does not rotate because of other trouble.
• Remedy: Case 1 Cause Fan connector disconnection Check and remedy Check the harness and the connector between the PCU PWB and the fan. Case 2 Cause Fan does not rotate because of other trouble. Check and remedy Use SIM6-2 to check that the fan is rotation actually.