• Code: 302
• Description: Charge roller current leak
  Current leak at the charge roller was detected.
• Causes: • Charge roller damaged • High voltage supply board defective • Poor connection of the PCU

• Code: 320
• Description: Polygon mirror motor error
  Did not detect lock signal from polygon mirror motor within 10 seconds after motor ON signal; or, lost lock signal for continuous 1.5 seconds after signal was detected.
• Causes: • Polygon mirror motor (or harness) defective • FCU defective

• Code: 322
• Description: Laser synchronization error
  Detected LD error signal for continuous 1.5 seconds while polygon mirror motor was running at constant speed.
• Causes: • Synchronization detection mirror defective • LD unit defective • FCU defective • LD harness damaged • THM not in place

• Code: 390
• Description: TD sensor error
  The TD sensor output less than 0.33 V or greater than 2.64 V ten times in succession.
• Causes: • TD sensor defective • Bad connection

• Code: 391
• Description: Development bias leak
  Development bias leak signal was detected.
• Causes: • Development roller defective • High voltage supply board defective

• Code: 392
• Description: Developer initialization error
  Error reading ID sensor pattern during developer initialization.
• Causes: • Forgot to remove heat seal from replacement PCU • ID sensor defective • TD sensor defective • Drum is not turning • Development roller is not turning • Right door not closed firmly

• Code: 401
• Description: Transfer roller leak error 1 ("+" leak)
  A current leak signal for the transfer roller was detected. (Current feedback signal was not detected for at least 200ms).
• Causes: • Transfer roller damaged • High voltage supply board defective • Poor connection between transfer unit and machine • Transfer unit set incorrectly

• Code: 402
• Description: Transfer roller leak error 2 ("-" leak)
  A current leak signal for the transfer roller was detected. (Current feedback signal was not detected for at least 200ms).
• Causes: • Transfer roller damaged • High voltage supply board defective • Poor connection between transfer unit and machine • Transfer unit set incorrectly