• Code: 390
• Description: TD sensor error
  The TD sensor outputs less than 0.2 V or more than 4.0 V 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 initial setting is not performed correctly.
• Causes: • ID sensor defective • No developer • Drum does not turn • Development roller does not turn • Poor connection of the PCU • The voltage is not applied to charge roller

• Code: 402
• Description: Transfer roller leak error 2
  A current leak signal for the transfer roller is detected. A 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: Discharge leak error
  High-voltage power supply board detects the 50% or more of PWM duty for 0.2 seconds.
• Causes: • Discharge plate defective • High-voltage power supply board defective

• Code: 490
• Description: Toner supply motor: Excess current error
  The machine detects the current of 1A or more supplied to the toner supply motor for 0.2 seconds.
• Causes: • Toner supply motor short circuit

• Code: 500
• Description: Main motor lock
  A main motor lock signal is not detected for more than 7 consecutive checks (700 ms) after the main motor starts to rotate, or the lock signal is not detected for more than 7 consecutive checks during rotation after the last signal.
• Causes: • Too much load on the drive mechanism • Main motor defective

• Code: 501
• Description: Tray 1 lift motor malfunction
  The paper lift sensor fails to activate twice continuously after the tray lift motor has been on for 18 seconds.
• Causes: • Paper lift sensor defective • Tray lift motor defective • Too much load on the drive mechanism • Poor tray lift motor connection