• Code: 301
• Description: Charge corona wire high voltage error: C. The high voltage error signal of the charge corona wire is detected for 60 ms or more.
• Causes: • Disconnected harnesses • Defective charge corona unit • Defective CGB HVPS • Defective BCU • Defective ground plate of the drum unit
• Remedy: 1. Check the harness connection. 2. Reinstall or replace the charge corona unit. 3. Replace the CGB HVPS. 4. Replace the BCU. 5. Replace the drum unit.

• Code: 302
• Description: Charge corona wire high voltage error: M. The high voltage error signal of the charge corona wire is detected for 60 ms or more.
• Causes: • Disconnected harnesses • Defective charge corona unit • Defective CGB HVPS • Defective BCU • Defective ground plate of the drum unit
• Remedy: 1. Check the harness connection. 2. Reinstall or replace the charge corona unit. 3. Replace the CGB HVPS. 4. Replace the BCU. 5. Replace the drum unit.

• Code: 303
• Description: Charge corona wire high voltage error: Y. The high voltage error signal of the charge corona wire is detected for 60 ms or more.
• Causes: • Disconnected harnesses • Defective charge corona unit • Defective CGB HVPS • Defective BCU • Defective ground plate of the drum unit
• Remedy: 1. Check the harness connection. 2. Reinstall or replace the charge corona unit. 3. Replace the CGB HVPS. 4. Replace the BCU. 5. Replace the drum unit.

• Code: 304
• Description: Charge grid high voltage error: K. The high voltage error signal of the charge grid is detected for 60 ms or more.
• Causes: • Disconnected harnesses • Defective charge corona unit • Defective CGB HVPS • Defective BCU
• Remedy: 1. Reinstall the charge corona unit 2. Check the harness connection. 3. Replace the charge corona unit. 4. Replace the CGB HVPS. 5. Replace the BCU.

• Code: 305
• Description: Charge grid high voltage error: C. The high voltage error signal of the charge grid is detected for 60 ms or more.
• Causes: • Disconnected harnesses • Defective charge corona unit • Defective CGB HVPS • Defective BCU
• Remedy: 1. Reinstall the charge corona unit 2. Check the harness connection. 3. Replace the charge corona unit. 4. Replace the CGB HVPS. 5. Replace the BCU.

• Code: 306
• Description: Charge grid high voltage error: M. The high voltage error signal of the charge grid is detected for 60 ms or more.
• Causes: • Disconnected harnesses • Defective charge corona unit • Defective CGB HVPS • Defective BCU
• Remedy: 1. Reinstall the charge corona unit 2. Check the harness connection. 3. Replace the charge corona unit. 4. Replace the CGB HVPS. 5. Replace the BCU.

• Code: 307
• Description: Charge grid high voltage error: Y. The high voltage error signal of the charge grid is detected for 60 ms or more.
• Causes: • Disconnected harnesses • Defective charge corona unit • Defective CGB HVPS • Defective BCU
• Remedy: 1. Reinstall the charge corona unit 2. Check the harness connection. 3. Replace the charge corona unit. 4. Replace the CGB HVPS. 5. Replace the BCU.

• Code: 308
• Description: Charge cleaning unit: Position error: K. The machine does not detect an "OFF" signal from the cleaning unit HP sensor for 3 seconds after the cleaning pad unit has moved to the rear side from its home position (front side). The machine does not detect an "ON" signal from the cleaning unit HP sensor for 18 seconds after the cleaning pad unit has returned to its home position (front side) from the rear side.
• Causes: • Disconnected harnesses (charge cleaning HP sensor or charge cleaning motor) • Defective charge cleaning HP sensor • Defective charge cleaning motor
• Remedy: 1. Check if the charge cleaning HP sensor is correctly set or the sensor bracket is not bent. 2. Check the harness connection of sensor and motor. 3. Replace the charge cleaning HP sensor. 4. Replace the charge cleaning motor.