• Code: 6030
• Description: Broken fuser thermistor 2 wire A/D value of the fuser thermistor 2 exceeds 1019 bit continuously for 4 s during warming up.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser thermistor and fuser thermistor connect PWB(YC2) Fuser thermistor connect PWB(YC3) and engine PWB (YC21)
  Deformed connector pin.
  Defective triac.
  Defective fuser thermistor. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6120
• Description: Abnormally high fuser thermistor 1 temperature The detection temperature of fuser thermistor 1 is higher than 245°C/473°F. In a heater-off state, the detection temperature of fuser thermistor 1 is higher than 195°C/383°F after the detection temperature of fuser thermistor 1 was 155°C/311°F or less.
• Remedy: Deformed connector pin.
  Defective triac.
  Shorted fuser thermistor. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6130
• Description: Broken fuser thermistor 1 wire A/D value of the fuser thermistor 1 exceeds 1019 bit continuously for 4 s during warming up.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser thermistor and fuser thermistor connect PWB(YC1) Fuser thermistor connect PWB(YC3) and engine PWB (YC21)
  Deformed connector pin.
  Defective triac.
  Defective fuser thermistor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6400
• Description: Zero-cross signal error While fuser heater control is performed, the zero-cross signal is not input within 2 s.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Power source PWB (YC3) and engine PWB (YC1)
  Defective power source PWB or engine PWB. Replace the power source PWB or the engine PWB and check for correct operation.

• Code: 7100
• Description: Toner sensor error Sensor output value of 930 or more continuously for 5 s.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner sensor and drum PWB (YC3) Drum connect PWB(YC2) and relay-L PWB (YC3) Relay-L PWB(YC1) and engine PWB (YC2)
  Defective toner sensor. Replace the developer unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7400
• Description: Developer unit non-installing error Sensor output value of 31 or less continuously for 5 s.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner sensor and drum PWB (YC3) Drum connect PWB(YC2) and relay-L PWB (YC3) Relay-L PWB(YC1) and engine PWB (YC2)
  Defective toner sensor. Replace the developer unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7410
• Description: Drum unit type mismatch error The drum PWB EEPROM does not communicate normally. Absence of the drum unit is detected.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum unit and drum connect PWB (YC1) Drum connect PWB(YC2) and relay-L PWB (YC3) Relay-L PWB(YC1) and engine PWB (YC2)
  Defective toner sensor. Replace the drum unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7800
• Description: Broken external thermistor wire The average of thermistor output value of 93 or less.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Operation PWB (YC1) and engine PWB (YC17)
  Defective temperature sensor. Replace the operation PWB.