• Code: C5104
• Description: Main high-voltage Y error
  Abnormality of charger roller Y is detected when Vpp adjustment.
• Causes: Installation defectiveness on charger roller unit Y. Defective charger roller unit Y.
• Remedy: Installation defectiveness on charger roller unit Y. Check the mounting state of the charger roller unit Y. If any problem is found, repair or replace the unit.
  Defective charger roller unit Y. Replace the charger roller unit Y.

• Code: C5301
• Description: Cleaning lamp K error
• Causes: Poor contact in the connector terminals. Defective cleaning lamp K. Defective PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC3 on the main front PWB and the connector of the drum unit K, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective cleaning lamp K. Replace the drum unit K.
  Defective PWB. Replace the main front PWB or engine PWB and check for correct operation.

• Code: C5302
• Description: Cleaning lamp C error
• Causes: Poor contact in the connector terminals. Defective cleaning lamp C. Defective PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC5 on the sub front PWB and the connector of the drum unit C, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective cleaning lamp C. Replace the drum unit C.
  Defective PWB. Replace the sub front PWB or engine PWB and check for correct operation.

• Code: C5303
• Description: Cleaning lamp M error
• Causes: Poor contact in the connector terminals. Defective cleaning lamp M. Defective PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC7 on the sub front PWB and the connector of the drum unit M, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective cleaning lamp M. Replace the drum unit M.
  Defective PWB. Replace the sub front PWB or engine PWB and check for correct operation.

• Code: C5304
• Description: Cleaning lamp Y error
• Causes: Poor contact in the connector terminals. Defective cleaning lamp Y. Defective PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC3 on the sub front PWB and the connector of the drum unit Y, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective cleaning lamp Y. Replace the drum unit Y.
  Defective PWB. Replace the sub front PWB or engine PWB and check for correct operation.

• Code: C6000
• Description: Fuser heater 1 break
  Fuser thermistor 1 detects a temperature lower than the Ready indication temperature for 90 s during warming up. Fuser thermistor 1 deduced less than 130C/266F for 5 s during stand-by. Fuser thermistor 1 does not reach 75C/ 167aF even after 30 s during warming up.
• Causes: Defective fuser heater 1. Defective fuser thermostat 1. Installation defectiveness on fuser thermistor 1. Defective PWB.
• Remedy: Defective fuser heater 1. Check for continuity across each heater. If none, replace the fuser unit.
  Defective fuser thermostat 1. Check for continuity across thermostat. If none, remove the cause and replace the fuser unit.
  Installation defectiveness on fuser thermistor 1. Measure the resistance. If it is , replace the fuser unit.
  Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6010
• Description: Abnormally high fuser thermistor temperature
  The fuser Abnormally high signal is detected for 60 s or more.
• Causes: Defective PWB.
• Remedy: Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6020
• Description: Abnormally high fuser thermistor 1 temperature
  The fuser temperature exceeds 240C/ 464F for 1 s.
• Causes: Installation defectiveness on fuser thermistor 1. Defective PWB.
• Remedy: Installation defectiveness on fuser thermistor 1. Measure the resistance. If it is ∞Ω, replace the fuser unit.
  Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.