• Code: SC390-2
• Description: TD sensor error 2
  The TD sensor output voltage is less than 1.8V or more than 4.8V during TD sensor initial setting.
• Causes: • TD sensor abnormal • No developer in the development unit

• Code: SC391
• Description: Development bias leak
  A development bias leak signal is detected.
• Causes: • Poor connection between the development bias terminal and the high voltage supply board • High voltage supply board defective

• Code: SC401-1
• Description: Transfer roller leak error
• Causes: • High voltage supply board defective • Poor connection between the transfer current terminal and the high voltage supply board

• Code: SC401-2
• Description: Transfer roller open error
  The transfer roller current feedback signal is not detected.
• Causes: • High voltage supply board defective • Poor connection between the transfer current terminal and the high voltage supply board • Poor PCU connection

• Code: SC403
• Description: Transfer belt position sensor error
  The transfer belt position sensor does not activate even if the transfer belt clutch has rotated once.
• Causes: • Main motor/drive malfunction • Transfer belt position sensor defective • Poor transfer belt position sensor connection

• Code: SC440
• Description: Main motor lock
  A main motor lock signal is not detected within 2 seconds after the main motor turns on.
• Causes: • Too much load on the drive mechanism • Main motor defective

• Code: SC490
• Description: Exhaust fan motor lock
  An exhaust fan motor lock signal is not detected within 5 seconds after the exhaust fan motor turns on.
• Causes: • Too much load on the drive mechanism • Exhaust fan motor defective • Poor fan motor connector connection

• Code: SC492
• Description: Cooling fan motor lock
  A cooling fan motor lock signal is not detected within 5 seconds after the cooling fan motor turns on.
• Causes: • Too much load on the drive mechanism • Cooling fan motor defective • Poor fan motor connector connection