• Code: C-3906
• Description: Fusing heating roller abnormality detection (hardware). The output voltage of the TH4 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 / 4 (TH4) Fusing heater lamp / 3 (L3) Printer control board (PRCB) AC drive board (ACDB)

• Code: C-4101
• Description: When the speed of the polygon motor (M17) is being switched, a speed lock signal is not detected within a specified period of time.
• Causes: Confirmation of the wiring harness and the connector Write unit (Polygon motor drive board (PMDB) Polygon motor (M17) ) DC power supply /2 (DCPS2)

• Code: C-4301
• Description: The rotation of the write unit cooling fan /1 (FM5) is checked, and 24V power source is also checked. An abnormal condition occurs with the FM5 EM signal a specified period of time after FM5 turns ON. This abnormal condition recurs even a specified period of time after FM5 is turned OFF and then turned ON, and an error detection signal (24V cut off) is detected.
• Causes: Confirmation of the wiring harness and the connector Write unit cooling fan /1 (FM5) AC drive board (ACDB) DC power supply /2 (DCPS2)

• Code: C-4302
• Description: The blowout of ICP for the write unit cooling fan /1 (FM5) in the AC drive board (ACDB) is checked. An abnormal condition occurs with the FM5 EM signal a specified period of time after FM5 turns ON. This abnormal condition recurs even a specified period of time after FM5 is turned OFF and then turned ON, and an error detection signal (blowout of ICP) is detected.
• Causes: Confirmation of the wiring harness and the connector Write unit cooling fan /1 (FM5) AC drive board (ACDB) DC power supply /2 (DCPS2)

• Code: C-4303
• Description: The rotation of the write unit cooling fan /1 (FM5) is checked. An abnormal condition occurs with the FM5 EM signal a specified period of time after FM5 turns ON. This abnormal condition recurs even a specified period of time after FM5 is turned OFF and then turned ON, and an error detection signal (24V cut off/ blowout of ICP) is not detected.
• Causes: Confirmation of the wiring harness and the connector Write unit cooling fan /1 (FM5) AC drive board (ACDB) DC power supply /2 (DCPS2)

• Code: C-4304
• Description: When the print is started, an error detection signal of the writing section cooling fan /1 (FM5) is detected.
• Causes: Confirmation of the wiring harness and the connector Write unit cooling fan /1 (FM5) AC drive board (ACDB) DC power supply /2 (DCPS2)

• Code: C-4305
• Description: The rotation of the write unit cooling fan /2 (FM8) is checked and the 24V power source is also checked. An abnormal condition occurs with the FM8 EM signal a specified period of time after the write unit cooling fan /2 (FM8) turns ON. This abnormal condition recurs even a specified period of time after FM8 is turned OFF and then turned ON, and an error detection signal (24V cut off) is detected.
• Causes: Confirmation of the wiring harness and the connector Write unit cooling fan /2 (FM8) AC drive board (ACDB) DC power supply /2 (DCPS2)

• Code: C-4306
• Description: The blowout of ICP for the write unit cooling fan /2 (FM8) in the AC drive board (ACDB) is checked. An abnormal condition occurs with the FM8 EM signal a specified period of time after the write unit cooling fan /2 (FM8) turns ON. This abnormal condition recurs even a specified period of time after FM8 is turned OFF and then turned ON, and an error detection signal (blowout of ICP) is detected.
• Causes: Confirmation of the wiring harness and the connector Write unit cooling fan /2 (FM8) AC drive board (ACDB) DC power supply /2 (DCPS2)