• Code: SC439
• Description: Drum Potential Sensor Error 6: Vh Abnormal
  When the LD power was adjusted during auto process control, the first value detected for the Vh pattern (used to set standard drum potential for halftones) exceeded -730V
• Causes: • Drum potential sensor harness, connector loose, broken, defective
  • Drum potential sensor defective
  • LD unit defective (pattern could not be created)

• Code: SC440
• Description: Transfer Output Error
  One of the following conditions was detected for 17 counts (about 100 ms) when the transfer voltage was applied with the main motor operating:
  • The value for the transfer current was set for 70uA, but the feedback voltage was less than 0.75V (less than 1.5 KV).
  • When the feedback current was less than 0.16V (10uA), the feedback voltage was less than 0.15V (less than 300V) due to a poor input connection.
  • When the feedback current was less than 0.16V (10uA), the feedback voltage was less than 3.05V (over 6.1 KV) due to a poor output connection.
• Causes: • Transfer power pack harness, connectors loose or broken
  • Transfer power pack harness or connectors have short circuited
  • Transfer power pack is defective

• Code: SC441
• Description: Development Motor Lock
  While the motor is operating, the motor lock signal remained LOW for 2 s
• Causes: • Development motor lock due to overload
  • IOB defective

• Code: SC487
• Description: Toner Collection Unit Lock
  The toner collection coil rotation sensor did not detect rotation of the coil within 5 s after the drum motor turned on due to toner clumping in the collection unit.
• Causes: • Cycle the machine off/on
  • Empty or replace the toner collection bottle.

• Code: SC488
• Description: 2nd Cleaning Blade Operation Error
  The push-switch signal from the cleaning blade solenoid was incorrect. The signal is detected 1 sec. after the solenoid operates.
• Causes: • 2nd blade solenoid connector loose, broken defective
  • 2nd blade solenoid defective
  • Release mechanism defective

• Code: SC489
• Description: Drum Cleaning Unit Set Error
  The drum cleaning unit is not set properly. The drum cleaning unit set switch is set every time the machine is turned on and when the front doors are closed.
• Causes: 1. Remove the drum cleaning unit
  2. Install it again.
  3. Close the front doors
  4. Cycle the machine off/on

• Code: SC491
• Description: Polygonal Mirror Motor Cooling Fan Motor Lock
  The polygonal mirror motor cooling fan motor lock signal remains HIGH for 5 s while the polygonal mirror motor cooling fan motor is on.
• Causes: • Drive mechanism overload
  • Obstruction has stopped the fan
  • Fan connector loose, broken, defective

• Code: SC492
• Description: Development Unit Suction Motor Lock
  While the development unit toner suction motor is operating, the lock sensor output did not change for 1 s An electrical overload in the PCB inside the motor unit has caused the motor to malfunction.
• Causes: • Replace the motor