• Code: 443
• Description: Image transfer unit error
  The machine detects the encoder sensor error.
• Causes: • Defective encoder sensor • Image transfer unit installation error • Defective image transfer unit motor
• Remedy: 1. Check the harness connection of the ITB rotation sensor. 2. Check the trash or scratch on the encoder disc surface of the ITB rotation sensor. 3. Check if the ITB unit is correctly set. 4. Replace the ITB unit motor. 5. Replace the ITB unit.

• Code: 452
• Description: Paper transfer unit contact error
  The paper transfer unit contact sensor does not detect the movement of actuator at the sensor while the polygon motor rotates.
• Causes: • Defective paper transfer unit contact sensor • Defective paper transfer unit contact motor • Broken +24V fuse on PSU • Defective IOB
• Remedy: Check the operation of the PTR contact motor with SP5804-076. No operation: 1. Check the harness connection of the PTR contact motor. 2. Replace the PTR contact motor. Operation: 1. Replace the PTR contact sensor.

• Code: 491
• Description: High voltage power: Drum/ development bias output error
  An error signal is detected for 0.2 seconds when charging the drum or development.
• Causes: • High voltage leak • Broken harness • Defective drum unit or development unit • Defective high voltage supply unit
• Remedy: 1. Check or replace the harness. 2. Replace the drum unit or paper transfer unit. 3. Replace the HVPS-CB board.

• Code: 492
• Description: High voltage power: Image transfer/ paper transfer bias output error
  An error signal is detected for 0.2 seconds when charging the separation, image transfer bet or paper transfer roller.
• Causes: • High voltage leak • Broken harness • Defective image transfer belt unit or paper transfer unit • Defective high voltage supply unit
• Remedy: 1. Input "0V" in the following SP settings: • SP2-326-001 • SP2-326-003 • SP2-407-001 2. Execute the "Process Control" with SP3011-001. 3. Replace the ITB unit if an SC occurs after the Process Control. 4. Replace the PTR unit if an SC does not occur after the Process Control. 5. Replace the HVPS-TTS board.

• Code: 495
• Description: PCDU toner collection motor error
  The machine detects that the PCDU toner collection bottle is not set for one second when the PCDU toner collection motor is turned off.
• Causes: • PCDU toner collection bottle motor damaged • Disconnect or defective harness • Defective DRB board
• Remedy: 1. Check or replace the harness. 2. Replace the PCDU toner collection bottle motor. 3. Replace the DRB board 4. Replace the BCU 5. Check and retry the connecting procedure.

• Code: 503
• Description: 3rd paper tray lift motor malfunction (optional Paper Tray Unit)
  The paper lift sensor did not activate within 18 sec. (for PTU) or 8 sec. (for LCT) after the tray lift motor switched on.
• Causes: • An obstruction (jammed paper, paper scraps, etc.) has blocked the motor drive and caused an overload. • Paper lift sensor connection loose, disconnected, or damaged • Paper lift sensor defective • Tray lift motor connection loose, disconnected, or damaged • Tray lift motor defective
• Remedy: 1. Check or replace the harness. 2. Replace the tray lift motor. 3. Replace the BCU.

• Code: 504
• Description: 4th paper tray lift motor malfunction (optional Paper Tray Unit)
  The paper lift sensor did not activate within 18 sec. (for PTU) or 8 sec. (for LCT) after the tray lift motor switched on.
• Causes: • An obstruction (jammed paper, paper scraps, etc.) has blocked the motor drive and caused an overload. • Paper lift sensor connection loose, disconnected, or damaged • Paper lift sensor defective • Tray lift motor connection loose, disconnected, or damaged • Tray lift motor defective
• Remedy: 1. Check or replace the harness. 2. Replace the tray lift motor. 3. Replace the BCU.

• Code: 506
• Description: Paper tray feed motor lock (optional Paper Tray Unit)
  A motor lock signal is not detected for more than 1.5 s at power-on or the lock signal is not detected for more than 1.0 s during rotation.
• Causes: • An obstruction (jammed paper, paper scraps, etc.) has blocked the feed motor drive and caused an overload. • Paper tray feed motor connection loose, disconnected, or damaged • Paper tray feed motor defective
• Remedy: 1. Check or replace the harness. 2. Replace the feed motor. 3. Replace the BCU