• Code: 390
• Description: TD sensor error
  The TD sensor outputs less than 0.5V or more than 4.0V 10 times consecutively during copying.
• Causes: • TD sensor abnormal • Poor connection of the PCU

• Code: 391
• Description: Development bias leak
  A development bias leak signal is detected.
• Causes: • Poor connection of the PCU • High voltage supply board defective

• Code: 392
• Description: TD sensor initial setting error
  TD sensor output voltage falls out of the adjustment range (2.0 ±<> 0.2 V) after the TD sensor initial setting has been finished.
• Causes: • Someone forgot to remove the toner seal of the PCU • ID sensor defective • TD sensor abnormal • Drum does not turn • Development roller does not turn • Poor connection of the PCU

• Code: 399
• Description: Illegal toner bottle (South Korea only)
  The toner bottle installed is not intended for use with this machine.
• Causes: • Install the correct type of toner bottle.

• Code: 401
• Description: Transfer roller leak error 1
  A transfer roller current leak signal is detected. The current feedback signal for the transfer roller is not detected.
• Causes: • High voltage supply board defective • Poor connection of the PCU • Transfer/separation unit set incorrectly • Transfer roller damaged

• Code: 402
• Description: Transfer roller leak error 2
  A transfer roller current leak signal is detected. The current feedback signal for the transfer roller is not detected.
• Causes: • High voltage supply board defective • Poor connection of the PCU • Transfer/separation unit set incorrectly • Transfer roller damaged

• Code: 411
• Description: Separation bias leak error
  A separation bias leak signal is detected.
• Causes: • High voltage supply board defective • Poor connection of the PCU • Discharge plate defective

• Code: 490
• Description: Toner supply motor leak error
  Over 1 A supplied to the toner supply motor for longer than 200 ms
• Causes: Toner supply motor defective