• Code: C-3804
• Description: Fusing sub sensor low temperature abnormality.
  - While in the idle, the fusing heater lamp /2 (L3) turns on for more than 12 seconds in succession.
• Causes: Thermistor /2 (TH2) Printer control board (PRCB)

• Code: C-3805
• Description: Fusing sub sensor low temperature abnormality.
  - While in other than the warm-up, the thermistor /2 (TH2) detects a temperature lower than 130 °C for more than 10 seconds.
• Causes: Thermistor /2 (TH2) Printer control board (PRCB)

• Code: C-3806
• Description: Fusing sub sensor low temperature abnormality.
  - The detection temperature of the thermistor /2 (TH2) does not get to the prescribed temperature within a specified period of time after it starts the warm-up.
• Causes: Thermistor /2 (TH2) Printer control board (PRCB)

• Code: C-3807
• Description: Fusing main sensor high temperature abnormality (sub CPU detection)
  - In the sub CPU, the thermistor /1 (TH1) detects a temperature higher than 236 °C for more than a specified period of time.
• Causes: Thermistor /1 (TH1) Printer control board (PRCB)

• Code: C-3808
• Description: Fusing sub sensor high temperature abnormality (sub CPU detection)
  - In the sub CPU, the thermistor /2 (TH2) detects a temperature higher than 236 °C for more than a specified period of time.
• Causes: Thermistor /2 (TH2) Printer control board (PRCB)

• Code: C-3901
• Description: Inferior contact of the thermistor /1 (TH1)
  - While in the warm-up condition, when the thermistor /2 (TH2) detection temperature gets to the Ready temperature before the TH1 detection temperature, the TH1 detection temperature does not get to the Ready temperature a specified period of time after the TH2 detection temperature got to the Ready temperature.
• Causes: Thermistor /1 (TH1) Printer control board (PRCB)

• Code: C-3902
• Description: Inferior contact of the thermistor /2 (TH2)
  - While in the warm-up condition, when the thermistor /1 (TH1) detection temperature gets to the Ready temperature before the TH2 detection temperature, the TH2 detection temperature does not get to the Ready temperature a specified period of time after the TH1 detection temperature got to the Ready temperature
• Causes: Thermistor /2 (TH2) Printer control board (PRCB)

• Code: C-3903
• Description: Thermistor /1 (TH1) open abnormality (sub CPU detection)
  - In the sub CPU, the TH1 detection temperature detects a temperature between -8 and 20 °C for more than a specified period of time.
• Causes: Thermistor /1 (TH1) Printer control board (PRCB)