• Code: SC302
• Description: High voltage power supply error Definition: [B] A charge roller current leak signal is detected.
• Causes: · Charge roller damaged · Charge high voltage supply board defective · Poor connection of the PCU

• Code: SC320
• Description: Polygon mirror motor error Definition: [B] The polygon mirror motor does not reach its operating speed within 10 seconds after the polygon mirror 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 engine board · Engine board defective

• Code: SC321
• Description: No laser writing signal (F-GATE) error Definition: [B] 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: · Engine board defective · Printer controller board defective

• Code: SC322
• Description: Laser synchronization error Definition: [B] The main scan synchronization detector board cannot detect the laser synchronization signal for more than 500 ms.
• Causes: · Poor connection between the laser synchronization detector board and the engine board · Laser synchronization detector board out of position · Laser synchronization detector board defective · Engine board defective · LD unit defective

• Code: SC324
• Description: LD drive current over Definition: [B] 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 engine board · Engine board defective

• Code: SC390
• Description: TD sensor error Definition: [B] The TD sensor outputs less than 0.5V or more than 4.0V 10 consecutively during printing.
• Causes: · TD sensor abnormal · Poor connection of the PCU

• Code: SC391
• Description: Development bias leak Definition: [B] 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 Definition: [B] TD sensor output voltage falls out of the adjustment range after the TD sensor initial setting has been finished.
• Causes: · The toner seal of the PCU was not removed · ID sensor defective · TD sensor abnormal · The Drum is not turning · Development roller does not turn · Poor connection of the PCU