• Code: SC320
• Description: Polygon motor error
  The polygon motor does not reach its operating speed within 10 seconds after the polygon motor on signal, or the lock signal is not detected for more than 200 ms continuously during operation.
• Causes: • Polygon mirror motor defective • Poor connection between the polygon mirror motor driver and the BICU board • BICU board defective

• Code: SC321
• Description: No laser start signal (F-GATE error)
  The laser writing signal (F-GATE) is still not LOW when the laser writing area +5 mm has passed since the laser writing start position on the drum.
• Causes: • BICU board defective • EMB (Copier feature expander) board defective • The fax controller or printer controller has a poor connection. • Fax controller or printer controller defective

• Code: SC322
• 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 laser synchronization detector board and the BICU board • Laser synchronization detector board out of position • Laser synchronization detector board defective • BICU board defective • LD unit defective

• Code: SC324
• Description: LD drive current over
  The LD drive board applies more than 100 mA to the LD.
• Causes: • LD unit defective (not enough power, due to aging) • Poor connection between the LD unit and the BICU board • BICU board defective

• Code: SC390
• Description: TD sensor error 1
  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: SC391
• Description: Development bias leak
  A development bias leak signal is detected.
• Causes: • Poor connection of the PCU • High voltage supply board defective

• Code: SC392
• 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: SC401
• 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