• Code: 321
• Description: No laser writing signal (F-GATE) error
  The laser-writing signal (F-GATE) fails to turn Low after the laser crosses 5 mm on the drum surface from the laser writing start position.
• Causes: • BICU board defective
  • Controller defective

• Code: 322
• Description: Laser synchronization error
  The main scan synchronization detector board cannot detect the laser synchronization signal for more than 5 consecutive 100 ms intervals.
• Causes: • Poor connection between the LD unit and the BICU board
  • Damaged cable between BICU and LD unit
  • LD unit out of position
  • LD unit defective
  • BICU board defective

• 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: Developer initialization error
  The ID sensor does not detect a correct pattern during developer initialization.
• Causes: • Seal in the PCU not removed
  • Defective ID sensor
  • Defective TD sensor
  • Defective drum operation
  • Defective development roller operation
  • Loose connection of the PCU
  • Insufficient voltage for the charge roller

• Code: 401
• Description: Transfer roller leak error 1 (positive electrode)
  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: 402
• Description: Transfer roller leak error 2 (negative electrode)
  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: 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