• Code: C-3504
• Description: Fusing heating roller high temperature abnormality (hardware). An abnormal condition is detected with the fusing error detection signal 4.
• Causes: Confirmation of the wiring harness and the connector Fusing temperature sensor / 3 (TH3) Fusing heater lamp /3 (L3) Printer control board (PRCB) AC drive board (ACDB)

• Code: C-3801
• Description: Fusing roller /Up low temperature abnormality (software). TH1 does not get to 75°C when a specified period of time has elapsed after the main switch (SW1) is turned ON for the fusing ON control.
• Causes: Confirmation of the wiring harness and the connector Fusing temperature sensor / 1 (TH1) Fusing heater lamp /1 (L1) Fusing heater lamp /2 (L2) Printer control board (PRCB) AC drive board (ACDB)

• Code: C-3802
• Description: Fusing heating roller low temperature abnormality (software). TH3 does not get to 50°C when a specified period of time has elapsed after the main switch (SW1) is turned ON for the fusing ON control.
• Causes: Confirmation of the wiring harness and the connector Fusing temperature sensor / 3 (TH3) Fusing heater lamp /3 (L3) Printer control board (PRCB) AC drive board (ACDB)

• Code: C-3901
• Description: Fusing roller /Up sensor abnormality (software). TH1 detects a temperature of 230°C or above 30 times in a row in a specified period of time.
• Causes: Confirmation of the wiring harness and the connector Fusing temperature sensor / 1 (TH1) Fusing heater lamp /1 (L1) Fusing heater lamp /2 (L2) Printer control board (PRCB) AC drive board (ACDB)

• Code: C-3902
• Description: Fusing heating roller sensor abnormality (software). TH3 detects a temperature of 220°C or above 30 times in a row in a specified period of time.
• Causes: Confirmation of the wiring harness and the connector Fusing temperature sensor / 3 (TH3) Fusing heater lamp /3 (L3) Printer control board (PRCB) AC drive board (ACDB)

• Code: C-3903
• Description: Fusing roller /Up sensor abnormality (hardware). The output voltage of the TH1 is detected as a low temperature abnormality (- 6°C or lower) in the comparator circuit.
• Causes: Confirmation of the wiring harness and the connector Fusing temperature sensor / 1 (TH1) Fusing heater lamp /1 (L1) Fusing heater lamp /2 (L2) Printer control board (PRCB) AC drive board (ACDB)

• Code: C-3904
• Description: Fusing heating roller sensor abnormality (hardware). The output voltage of the TH3 is detected as a low temperature abnormality (-6°C or lower) in the comparator circuit.
• Causes: Confirmation of the wiring harness and the connector Fusing temperature sensor / 3 (TH3) Fusing heater lamp /3 (L3) Printer control board (PRCB) AC drive board (ACDB)

• Code: C-3905
• Description: Fusing roller /Up abnormality detection (hardware). The output voltage of the TH2 is detected as a low temperature (-6°C or lower) or high temperature (240.5°C or higher) abnormality in the comparator circuit.
• Causes: Confirmation of the wiring harness and the connector Fusing temperature sensor / 2 (TH2) Fusing heater lamp /1 (L1) Fusing heater lamp /2 (L2) Printer control board (PRCB) AC drive board (ACDB)