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

• Code: 392
• Description: TD sensor initial setting error
  TD sensor initial setting is not performed correctly.
• Causes: • ID sensor • 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: 440
• Description: Image transfer positive electrode current error
  An interrupt checks the status of the power pack every 20 ms. This SC is issued if the BCU detects a short in the power pack 10 times consecutively.
• Causes: • Defective image transfer roller • Defective high voltage supply unit • Connection error • Image transfer unit is not installed correctly.

• Code: 460
• Description: Separation power pack output error (D158/D159)
  An interrupt checks the status of the power pack every 20 ms. This SC is issued if the BCU detects a short in the power pack 10 times at D (ac).
• Causes: • High-voltage leak • Loose connection • Broken harness • Defective-high voltage supply unitt

• Code: 490
• Description: Toner transport motor error (D158/D159)
  When the toner transport motor is ON
• Causes: • Motor lock • Defective motor drive

• Code: 501
• Description: Tray 1 lift motor malfunction (Optional paper tray units)
  The paper lift sensor fails to activate twice continuously after the tray lift motor has been on for 12 seconds
• Causes: • Paper lift sensor • Tray lift motor • Too much load on the drive mechanism • Poor tray lift motor connections

• Code: 502
• Description: Tray 2 lift motor malfunction (Optional paper tray units)
  The paper lift sensor fails to activate twice continuously after the tray lift motor has been on for 12 seconds
• Causes: • Paper lift sensor • Tray lift motor • Too much load on the drive mechanism • Poor tray lift motor connections.

• Code: 503
• Description: Tray 3 error (D160/D161/D170)
  The paper lift sensor fails to activate three times continuously after the tray lift motor has been on for 18 seconds.
• Causes: • Paper lift sensor • Tray lift motor • Broken harness • Defective bank controller board