• Code: L4-02
• Description: Drum motor lock detection
  The motor lock signal is detected for 1.5sec during rotation of the drum motor. When the motor lock signal is detected for 3 times continuously in the interval of 500ms after 900ms of rotation start.
• Causes: Drum motor trouble
  Improper connection of the harness between the PCU PWB and the drum motor Control circuit trouble
• Remedy: Case 1 Cause Drum motor trouble Check and remedy Use SIM 25-1 to check the drum motor operation. Case 2 Cause Improper connection of the harness between the PCU PWB and the drum motor Control circuit trouble Check and remedy Check the harness and the connector of the PCU PWB, and the drum motor.

• Code: L4-03
• Description: Fusing motor lock detection
  When it is detected for 3 times continuously in the interval of 500ms after ignoring the fusing motor drive start for 600ms.
• Causes: Main motor troubleI
  mproper connection of the harness between the PCU PWB and the fusing motor Control circuit trouble
• Remedy: Case 1 Cause Main motor trouble Check and remedy Use SIM 25-1 to check the fusing motor operation. Case 2 Cause Improper connection of the harness between the PCU PWB and the fusing motor Control circuit trouble Check and remedy Check connection of the harness and the connector between the PCU PWB and the fusing motor.

• Code: L4-04
• Description: Developing motor lock detection
  The motor lock signal is detected for 1.5sec during rotation of the developing motor. When the motor lock signal is detected for 3 times continuously in the interval of 500ms after 900ms of rotation start.
• Causes: Developing motor trouble
  Improper connection of the harness between the PCU PWB and the developing motor. Control circuit trouble.
• Remedy: Case 1 Cause Developing motor trouble Check and remedy Use SIM 6-1 to check the developing motor operation. Case 2 Cause Improper connection of the harness between the PCU PWB and the developing motor. Control circuit trouble. Check and remedy Check the harness and the connector between the PCU PWB and the developing motor.

• Code: L4-06
• Description: Transfer belt separation motor trouble detection
  Transfer belt separation motor trouble detection The transfer belt home position sensor ON/OFF is not detected within the specified time (4 sec) during operation of the transfer belt (separation, contact).
• Causes: Transfer belt separation motor trouble
  Improper connection of the harness between the PCU PWB and the transfer belt separation motor. Control circuit trouble
• Remedy: Case 1 Cause Transfer belt separation motor trouble Check and remedy Use SIM 6-1 to check the transfer belt motor operation. Case 2 Cause Improper connection of the harness between the PCU PWB and the transfer belt separation motor. Control circuit trouble Check and remedy Check connection of the harness and the connection of the harness between the PCU PWB and the transfer belt separation motor.

• Code: L4-30
• Description: Controller fan motor lock detection
  The motor lock signal is detected during rotation of the controller fan motor. The motor lock signal is detected during rotation of the HDD fan motor.
• Causes: Fan motor trouble
  Improper connection of the harness between the controller PWB and the fan motor. Control circuit trouble
• Remedy: Case 1 Cause Fan motor trouble Check and remedy Use SIM 6-2 to check the fan motor operation. Case 2 Cause Improper connection of the harness between the controller PWB and the fan motor. Control circuit trouble Check and remedy Check the harness and the connector between the controller PWB and the fan motor.

• Code: L4-31
• Description: Paper discharging fan trouble
  When the detected value of the temperature sensor (TH_EX) in the paper exit reverse unit is greater than the specified level for 2 times continuously in the interval of 30sec. When 100°C (value of 235) of the paper exit thermistor is detected for 3 times continuously. (In the interval of 100ms)
• Causes: Fan motor trouble
  PCU PWB, harness connection between fan and motor trouble PCU circuit trouble
  Thermistor (TH_EX) trouble
• Remedy: Case 1 Cause Fan motor trouble Check and remedy Use SIM 6-2 to check the fan motor operation. Case 2 Cause PCU PWB, harness connection between fan and motor trouble PCU circuit trouble Thermistor (TH_EX) trouble Check and remedy Check the PCU PWB, the harness between fan and motor, and the connector.

• Code: L6-10
• Description: Polygon motor lock detection
  It is judged that the polygon motor lock signal of the LSU is not outputted. The polygon motor lock signal is checked in an interval of 10sec after starting the polygon motor, and it is found that the olygon motor is not rotating normally.
• Causes: Polygon motor trouble
  Disconnection or breakage of the LSU connector or the harness in the LSU
• Remedy: Case 1 Cause Polygon motor trouble Check and remedy Use SIM 61-1 to check the polygon motor operation. Case 2 Cause Disconnection or breakage of the LSU connector or the harness in the LSU Check and remedy Check connection of the harness and the connector. Replace the LSU.

• Code: L8-01
• Description: No full wave signal
  The full wave signal is not detected. When the FWS signal is not varied for 120ms when supplying the power.
• Causes: Disconnection or breakage of the PCU PWB connector or the harness in the power unit
  PCU PWB trouble
  12V power source trouble
• Remedy: Case 1 Cause Disconnection or breakage of the PCU PWB connector or the harness in the power unit Check and remedy Check connection of the harness and the connector. Case 2 Cause PCU PWB trouble Check and remedy Replace the PCU PWB. Case 3 Cause 12V power source trouble Check and remedy Replace the power unit. Replace the controller connection mother board.