• Code: SC390
• Description: TD sensor error
  TD sensor output voltage falls out of the adjustment target (2.5+- 0.1 V) during the Vt check.
  Vt-Vtref>0.6V is detected 10 consecutive times even though toner is detected by the toner end sensor.
  Vt<0.5 or Vt>4.0 is detected.
• Causes: • TD sensor abnormal • BCU board defective

• Code: SC391
• Description: Development bias leak
  A development bias leak signal is detected.
• Causes: • Sleeve roller receptacle damage • Development bias power pack defective

• Code: SC392
• Description: Image storage address error
  The EX-IPU receives the image data output request signal for data that is not stored in memory
• Causes: • Transfer high voltage supply board defective • Transfer belt position sensor defective

• Code: SC401
• Description: Transfer belt error
  A transfer belt current leak signal is detected.
• Causes: • Transfer high voltage supply board defective • Transfer belt position sensor defective

• Code: SC405
• Description: Time out error (scanner)
  The BCU does not receive the scanner access ready signal from the EX-IPU
• Causes:

• Code: SC440
• Description: Main motor lock
  A main motor lock signal is detected for more than 2 seconds.
• Causes: • Too much load on the drive mechanism • Main motor defective

• Code: SC490
• Description: Ozone fan motor lock/Exhaust fan motor lock
  A fan motor lock signal is detected for more than 0.5 second from either fan.
• Causes: • Ozone fan motor defective • Exaust fan motor defective • Poor connection of the fan motor connector • Something is stuck in the fan motor

• Code: SC501
• Description: Main body tray lift motor malfunction
  • The paper upper limit sensor is not actuated after the tray lift motor has been on for 10 seconds. • The pick-up roller solenoid does not contact the top sheet of paper
• Causes: • Upper limit sensor defective • Tray lift motor defective • Pick-up roller solenoid defective