• Code: E021-0001
• Description: CL Developing Motor startup error
  After 700 msec since the startup, the speed failed to be OK for 500 consecutive msec.
• Remedy: Possible cause is overload or rotation failure of the motor due to an electrical trouble 1. Check the Main Drive Unit (turn the unit by hand to see if it rotates) Replace the Main Drive Unit when the unit failed to rotate When the unit rotates 2. Check failure of the harness between the Developing Motor (M03/J6026) and the DC Controller PCB (UN09/J210W) (trapped cable, open circuit, connector disconnection) 3. Check conduction of the fuse (FU7) in the DC Controller PCB (UN09) When the fuse is not blown out 4-1. Replace the Developing Motor (M03) 5-1. Replace the DC Controller PCB (UN09). When the fuse is blown out 4-2. Replace the DC Controller PCB (UN09).

• Code: E021-0003
• Description: CL Developing Motor lock detection
  Since the startup, the FG signal failed to be turned ON for 300msec.
• Remedy: Possible cause is overload or rotation failure of the motor due to an electrical trouble 1. Check the Main Drive Unit (turn the unit by hand to see if it rotates) Replace the Main Drive Unit when the unit failed to rotate When the unit rotates 2. Check failure of the harness between the Developing Motor (M03/J6026) and the DC Controller PCB (UN09/J210W) (trapped cable, open circuit, connector disconnection) 3. Check conduction of the fuse (FU7) in the DC Controller PCB (UN09) When the fuse is not blown out 4-1. Replace the Developing Motor (M03) 5-1. Replace the DC Controller PCB (UN09). When the fuse is blown out 4-2. Replace the DC Controller PCB (UN09).

• Code: E021-0020
• Description: Developing screw rotation detection
  Error in the difference between the maximum and the minimum of ATR Sensor (Y) detection value.
• Remedy: Possible cause: The screw is not rotating due to failure in the coupling between the main body and the Developing Assembly, or the value of ATR Sensor (Y) (UN39) failed to be read due to an electrical trouble. 1. Remove the Drum Unit (Y) and check no damage. (Replace the Drum Unit (Y) if defective) 2. Lift the pressure lever after the Drum Unit (Y) is pushed all the way in. 3. Check failure of the harness between the Drum Unit (Y) and the DC Controller PCB (UN09/J25) (trapped cable, open circuit, connector disconnection) 4.Check the Drum Unit Relay PCB (Y) (UN26) (Soil/ deformation/ damage) 5. Check the Drum Unit Memory PCB (M) (UN30) (Soil/ damage) 6.Replace the Drum Unit (Y) 7. Replace the DC Controller PCB (UN09). 8. Replace the Main Drive Unit

• Code: E021-0120
• Description: Developing screw rotation detection
  Error in the difference between the maximum and the minimum of ATR Sensor (M) detection value.
• Remedy: Possible cause: The screw is not rotating due to failure in the coupling between the main body and the Developing Assembly, or the value of ATR Sensor (M) (UN40) failed to be read due to an electrical trouble. 1. Remove the Drum Unit (M) and check no damage. (Replace the Drum Unit (M) if defective) 2. Lift the pressure lever after the Drum Unit (M) is pushed all the way in. 3. Check failure of the harness between the Drum Unit (M) and the DC Controller PCB (UN09/J25) (trapped cable, open circuit, connector disconnection) 4.Check the Drum Unit Relay PCB (M) (UN27) (Soil/ deformation/ damage) 5. Check the Drum Unit Memory PCB (M) (UN31) (Soil/ damage) 6.Replace the Drum Unit (M) 7. Replace the DC Controller PCB (UN09). 8. Replace the Main Drive Unit

• Code: E021-0220
• Description: Developing screw rotation detection
  Error in the difference between the maximum and the minimum of ATR Sensor (C) detection value.
• Remedy: Possible cause: The screw is not rotating due to failure in the coupling between the main body and the Developing Assembly, or the value of ATR Sensor (C)(UN41) failed to be read due to an electrical trouble. 1. Remove the Drum Unit (C) and check no damage. (Replace the Drum Unit (C) if defective) 2. Lift the pressure lever after the Drum Unit (C) is pushed all the way in. 3.Check failure of the harness between the Drum Unit (C) and the DC Controller PCB (UN09/J25) (trapped cable, open circuit, connector disconnection) 4.Check the Drum Unit Relay PCB (C) (UN28) (Soil/ deformation/ damage) 5.Check the Drum Unit Memory PCB (C) (UN32) (Soil/ damage) 6.Replace the Drum Unit (C). 7. Replace the DC Controller PCB (UN09). 8. Replace the Main Drive Unit

• Code: E021-0320
• Description: Developing screw rotation detection
  Error in the difference between the maximum and the minimum of ATR Sensor (Bk) detection value.
• Remedy: Possible cause: The screw is not rotating due to failure in the coupling between the main body and the Developing Assembly, or the value of ATR Sensor (Bk) (UN42) failed to be read due to an electrical trouble 1. Remove the Drum Unit (Bk) and check no damage. (Replace the Drum Unit (Bk) if defective) 2. Lift the pressure lever after the Drum Unit (Bk) is pushed all the way in. 3. Check failure of the harness between the Drum Unit (Bk) and the DC Controller PCB (UN09/J25) (trapped cable, open circuit, connector disconnection) 4.Check the Drum Unit Relay PCB (Bk) (UN29) (Soil/ deformation/ damage) 5. Check the Drum Unit Memory PCB (Bk) (UN33) (Soil/ damage) 6.Replace the Drum Unit (Bk). 7. Replace the DC Controller PCB (UN09). 8. Replace the Main Drive Unit

• Code: E022-0000
• Description: Error in detection of abnormal opening/closing of the Laser Shutter
  At the Dustproof Shutter open/close control, the sensor fails to detect although the specified time has passed.
• Remedy: Error in the Shutter Motor or the Laser Shutter Sensor 1.COPIER > FUNCTION > PART-CHK > MTR; move M05 When it works 2-1. Check the harness between the DC Controller (UN09/ J11) and the Laser Shutter Sensor (PS05) 3-1. Check condition of the Laser Shutter 4-1. Check the Laser Shutter Sensor (PS05) in the Main Drive 5-1. Replace the Main Drive When it does not work 2-2. Check the harness between the DC Controller (UN09/ J31) and the Developing Disengagement Motor (M05) 3-2. Check conduction of the fuse (FU6) in the DC Controller (UN09) 4-2. Replace the Laser Shutter Motor (M05) 5-2. Replace the Main Drive

• Code: E025-0000
• Description: Toner Supply Motor (Y) lock detection
  Failed to detect rotation after turning ON the motor.
• Remedy: Possible cause: overload with the motor or motor failure 1. Check conduction with FU2 on the DC Controller PCB (UN09) 2. Check the harness/connector between the DC Controller PCB (UN09/ J23) and PS06. 3. Replace the DC Controller PCB (UN09) Check the harness toward the sensor 4. Check the Hopper Unit (Y) 5. Replace the Hopper Unit (Y).