Check the following points to resolve the issue:

1. Clean all four corona wires (one for each color) inside the drum unit by sliding the green tab.
   > Click here to see how to clean the corona wires.
    
2. Make sure the green tab of the corona wire is in the home position (1).
   
    
3. Replace the toner cartridge that matches the color of the streak or band.
   To identify the color of the toner cartridge, follow the steps below:

    

   1. > Click here to print the chart. [345KB/ PDF]
   2. Compare your printed document with the printed chart to identify the color causing the issue.
   3. Replace the toner cartridge of the color.
      > Click here to see how to replace the toner cartridge.
4. Install a new drum unit.
   > Click here to see the how to replace the drum unit.