• Code: L4-59
• Description: Suction fan trouble
• Causes: The fan operation signal is not detected within the specified time in the suction fan operation. Suction 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 suction fan. 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 8 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 connector 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 connector 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 connector and the harness. Check the power waveform.

• Code: L8-20
• Description: Communication error of MFP PWB/ Mother board
• Causes: Mother board PWB - MFP PWB connection trouble. MFP PWB trouble. Mother trouble.
• Remedy: Check connection between the mother board and the MFP PWB. Check the ground 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.

• Code: U1-01
• Description: Battery trouble
  Backup SRAM battery voltage fall.
• Causes: Battery life Battery circuit abnormality
• Remedy: Check to confirm that the battery voltage is about 2.0V or above.

• Code: U2-00
• Description: MFP EEPROM read/write error
• Causes: MFP PWB EEPROM trouble. EEPROM socket contact trouble. MFP PWB trouble. Strong external noises
• Remedy: Replace the MFP PWB EEPROM. Replace the MFP PWB. Check the power environment.