• Code: 6000
• Description: Fuser heater 1/2 break
  Fuser thermistor 1 detected less than 75 °C/167 °F for 30 s during worming up. Fuser thermistor 1 deduced 40 °C/104 °F or more for 5 s during worming up. Fuser thermistor 3 deduced less than 90 °C/194 °F for 30 s during worming up. Fuser thermistor 3 deduced less than 160 °C/320 °F for 90 s during worming up. Fuser thermistor 3 deduced less than 140 °C/284 °F for 5 s during stand-by.
• Causes: Defective fuser heater 1/2. Defective fuser thermostat 1. Installation defectiveness on fuser thermistor 1/2. Defective PWB.
• Remedy: Defective fuser heater 1/2. 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 1/2. 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: 6010
• 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: 6020
• Description: Abnormally high fuser thermistor 1/3 temperature
  The fuser temperature exceeds 240 °C/ 464 °F.
• Causes: Defective PWB. Installation defectiveness on fuser thermistor 1/3.
• Remedy: Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.
  Installation defectiveness on fuser thermistor 1/3. Measure the resistance. If it is ∞, replace the fuser unit.

• Code: 6030
• Description: Fuser thermistor 1/3 break error
  Fuser thermistor 1 detected 40 °C/104 °F or less during warming up. 40 °C/104 °F or less is detected between 10 s of continuation during worming up. Fuser thermistor 3 detected 40 °C/104 °F or less during warming up.
• Causes: Defective fuser heater 1/2. Installation defectiveness on fuser thermistor 1/3. Defective PWB.
• Remedy: Defective fuser heater 1/2. Check for continuity across each heater. If none, replace the fuser unit.
  Installation defectiveness on fuser thermistor 1/3. 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: 6050
• Description: Abnormally low fuser thermistor 3 temperature
  During printing, the temperature at the heat roller lower than 100 °C/212 °F is detected continuously for 1 s.
• Causes: Defective fuser heater 1/2. Defective PWB.
• Remedy: Defective fuser heater 1/2. Replace the fuser unit.
  Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: 6100
• Description: Fuser heater 3 break
  Fuser thermistor 2 detected less than 100 °C/212 °F for 120 s during driving. Fuser thermistor 2 deduced less than 150 °C/302 °F for 300 s during driving. Fuser thermistor 2 deduced less than 100 °C/212 °F for 5 s during driving.
• Causes: Defective fuser heater 3. Defective fuser thermostat 2. Installation defectiveness on fuser thermistor 2. Defective PWB.
• Remedy: Defective fuser heater 3. Check for continuity across each heater. If none, replace the fuser unit.
  Defective fuser thermostat 2. Check for continuity across thermostat. If none, remove the cause and replace the fuser unit
  Installation defectiveness on fuser thermistor 2. 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: 6120
• Description: Abnormally high fuser thermistor 2 temperature
  The fuser temperature exceeds 190 °C/ 374 °F..
• Causes: Installation defectiveness on fuser thermistor 2. Defective PWB.
• Remedy: Installation defectiveness on fuser thermistor 2. 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: 6130
• Description: Fuser thermistor 2 break error
  Fuser thermistor 2 detected less than 40 °C/104 °F during driving. When the difference of temperature of fuser thermistor 1 and 3 becomes 100 °C/212 °F or more.
• Causes: Installation defectiveness on fuser thermistor 2. Defective fuser heater 3. Defective PWB.
• Remedy: Installation defectiveness on fuser thermistor 2. Measure the resistance. If it is ∞, replace the fuser unit.
  Defective fuser heater 3. Check for continuity across each heater. If none, replace the fuser unit.
  Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.