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

• Code: L4-50
• Description: Process fan trouble
• Causes: The fan operation signal is not detected within the specified time in the process fan operation. Process fan trouble. PCU PWB trouble Connection trouble of the connector and the harness.
• Remedy: Check that the fan is rotating after turning ON the power. Replace the process fan. Replace the PCU PWB. Harness and connector connection trouble.

• Code: L4-51
• Description: Process fan 2 trouble
• Causes: The fan operation signal is not detected within the specified time in the process fan 2 operation. Process fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
• Remedy: Check that the fan is rotating after turning ON the power. Replace the process fan 2. Replace the PCU PWB. Check connection of the connector and the harness.

• Code: L6-10
• Description: Polygon motor trouble
• Causes: The motor does not reach the specified rpm in 7 sec after starting rotation of the polygon motor. Polygon motor trouble. LSU control 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 connectors and the harness. Replace the polygon motor. Replace the LSU. Replace the LSU control PWB.

• Code: L8-01
• Description: Full wave signal detection error
• Causes: No full wave signal is detected. PCU PWB trouble Power unit trouble. Connection trouble of the connector and the harness.
• Remedy: Replace the PCU PWB. Replace the power unit. Check connection of the connectors and the harness.

• Code: L8-02
• Description: Full wave signal error
• Causes: An abnormality in the full wave signal frequency is detected. (The frequency is detected as 65Hz or above, or 45Hz or less.)PCU PWB trouble. Power unit trouble. Connection trouble of the connector and the harness. Power frequency, waveform abnormality.
• Remedy: Replace the PCU PWB. Replace the power unit. Check connection of the connectors and the harness. Check the power waveform.

• Code: L8-20
• Description: MFP PWB - Mother board communication error
• Causes: Mother board PWB - MFPC PWB connection trouble. MFP PWB trouble. Replace the mother board.
• Remedy: Check connection between the mother board and the MFPC PWB. Check the earth line of the main unit. Replace the MFPC PWB. Replace the mother board.

• Code: PC--
• Description: Personal counter not detected
• Causes: The personal counter is not installed. The personal counter is not detected.
• Remedy: Check connection of the connectors and the harness. Replace the SCU PWB.