• Code: C-3904
• Description: Thermistor /2 (TH2) open abnormality (sub CPU detection)
  - In the sub CPU, the TH2 detection temperature detects a temperature between -8 and 20 °C for more than a specified period of time.
• Causes: Thermistor /2 (TH2) Printer control board (PRCB)

• Code: C-4001
• Description: Index board (INDEXB) contact abnormality.
• Causes: Index board (INDEXB) Overall control board (OACB)

• Code: C-4101
• Description: Polygon motor (M5) speed abnormality.
  - When M5 is ON, an error signal is detected 3 times in succession within a specified period of time.
• Causes: Polygon motor (M5) Printer control board (PRCB)

• Code: C-4401
• Description: Laser drive board (LDB) abnormality.
  - When an overcurrent flows for laser output.
• Causes: Laser drive board (LDB) Overall control board (OACB)

• Code: C-4701
• Description: Laser index abnormality.
  - When the cycle of the index is different from an expected value.
• Causes: Index board (INDEXB) Overall control board (OACB)

• Code: C-5001
• Description: Main body control board communication abnormality 1
  - Communication abnormality between the overall control board (OACB) and the scanner drive board (SDB).
• Causes: Overall control board (OACB) Scanner drive board (SDB)

• Code: C-5002
• Description: Main body control board communication abnormality 2
  - Communication abnormality, incoming command abnormality, platen operation sequence abnormality to the sub CPU in the overall control board (OACB).
• Causes: Printer control board (PRCB)

• Code: C-5003
• Description: Sub CPU A/D conversion abnormality.
  - There is no response 2 times in succession to the A/D conversion request of the overall control board (OACB).
• Causes: Printer control board (PRCB)