• Code: C5300
• Description: Cleaning lamp broken detection • The current at the correct level is not detected when ASIC (U8) on the engine controller PCB generates the signal to activate the cleaning lamp.
• Causes: Defective engine controller PCB. Defective drum unit (cleaning lamp or drum PCB). Defective harness between engine controller PCB and drum unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PCB and check for correct operation. Replace the drum unit. Check the continuity of the harness and the insertion of connectors.

• Code: C6000
• Description: Heat roller heating time-out 1 • The temperature on the heat roller does not rise within the predetermined period when ASIC (U8) on the engine controller PCB has turned on the upper heater lamp. This is detected when the upper heater lamp is turned on.
• Causes: Defective engine controller PCB. Defective upper fuser heater. Defective upper thermostat. Defective fuser PCB. Defective upper fuser thermistor, or fitting is not proper. Defective power supply unit. Defective harness between engine controller PCB and fuser unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PCB and check for correct operation. Replace the fuser unit (upper fuser heater). Replace the fuser unit (upper thermostat). Replace the fuser unit (fuser PCB). Replace the fuser unit (upper fuser thermistor). Replace the power supply unit. Check the continuity of the harness and the insertion of connectors.

• Code: C6010
• Description: Heat roller heating time-out 2 • The temperature on the heat toller does not reach the correct temperature within the predetermined period after self-diagnostic code 6000 is cleared. The period for detection is longer than the condition for self-diagnostics code 6000.
• Causes: Defective engine controller PCB. Defective upper fuser heater. Defective upper thermostat. Defective fuser PCB. Defective upper fuser thermistor, or fitting is not proper. Defective AC power source. (Abnormal low voltage) Defective harness between engine controller PCB and fuser unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PCB and check for correct operation. Replace the fuser unit (upper fuser heater). Replace the fuser unit (upper thermostat). Replace the fuser unit (fuser PCB). Replace the fuser unit (upper fuser thermistor). Connect to the proper AC power source. Check the continuity of the harness and the insertion of connectors.

• Code: C6020
• Description: Heat roller abnormal high temperature • The temperature on the heat roller has risen up to the abnormal temperature.
• Causes: Defective engine controller PCB. Defective upper fuser heater. Defective fuser PCB. Defective upper fuser thermistor. Defective power supply unit. Defective AC power source. (Abnormal high voltage) Defective harness between engine controller PCB and fuser unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PCB and check for correct operation. Replace the fuser unit (upper fuser heater). Replace the fuser unit (fuser PCB). Replace the fuser unit (upper fuser thermistor). Replace the power supply unit. Connect to the proper AC power source. Check the continuity of the harness and the insertion of connectors.

• Code: C6030
• Description: Upper fuser thermistor broken detection • No temperature detection output is obtained from the upper fuser thermistor.
• Causes: Defective engine controller PCB. Defective fuser PCB. Defective upper fuser thermistor, or improper fitting. Defective harness between engine controller PCB and fuser unit (upper fuser thermistor), or poor contact of the connector terminals.
• Remedy: Replace the engine controller PCB and check for correct operation. Replace the fuser unit (fuser PCB). Replace the fuser unit (upper fuser thermistor). Check the continuity of the harness and the insertion of connectors.

• Code: C6040
• Description: Upper fuser thermistor abnormal temperature detection • The temperature detection output from the upper fuser thermistor is abnormal change.
• Causes: Defective engine controller PCB. Defective fuser PCB. Defective upper fuser thermistor, or fitting is not proper. Defective harness between engine controller PCB and fuser unit (upper fuser thermistor), or poor contact of the connector terminals.
• Remedy: Replace the engine controller PCB and check for correct operation. Replace the fuser unit (fuser PCB). Replace the fuser unit (upper fuser thermistor). Check the continuity of the harness and the insertion of connectors.

• Code: C6100
• Description: Press/heat roller heating time-out 1 • The temperature on the press/heat roller does not rise within the predetermined period when ASIC (U8) on the engine controller PCB has turned on the lower heater lamp. This is detected when the lower heater lamp is turned on.
• Causes: Defective engine controller PCB. Defective lower fuser heater. Defective lower thermostat. Defective fuser PCB. Defective lower fuser thermistor, or fitting is not proper. Defective power supply unit. Defective harness between engine controller PCB and fuser unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PCB and check for correct operation. Replace the fuser unit (lower fuser heater). Replace the fuser unit (lower thermostat). Replace the fuser unit (fuser PCB). Replace the fuser unit (lower fuser thermistor). Replace the power supply unit. Check the continuity of the harness and the insertion of connectors.

• Code: C6110
• Description: Press/heat roller heating time-out 2 • The temperature on the press/heat toller does not reach the correct temperature within the predetermined period after self-diagnostic code 6100 is cleared. The period for detection is longer than the condition for self-diagnostics code 6100.
• Causes: Defective engine controller PCB. Defective lower fuser heater. Defective lower thermostat. Defective fuser PCB. Defective lower fuser thermistor, or fitting is not proper. Defective AC power source. (Abnormal low voltage) Defective harness between engine controller PCB and fuser unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PCB and check for correct operation. Replace the fuser unit (lower fuser heater). Replace the fuser unit (lower thermostat). Replace the fuser unit (fuser PCB). Replace the fuser unit (upper fuser thermistor). Connect to the proper AC power source. Check the continuity of the harness and the insertion of connectors.