Please check the following points to resolve the issue:

1. (For models with Automatic Document Feeder only)
   Wipe the scanner glass strip with a dry lint free soft cloth.
    
2. The drum unit or toner cartridges may not be installed correctly. Re-install the drum unit and toner cartridges.

    

   • Click here to see the details of how to install the drum unit.
   • Click here to see the details of how to install the toner cartridges.
3. The corona wire of the drum unit may be dirty. Clean all four corona wires (one for each color) inside the drum unit by sliding the green tab. After completing the cleaning, make sure the corona wire cleaners are at their home positions.
   > Click here to see the details of how to clean the corona wires.
    
4. The toner cartridge may be damaged. Put in a new toner cartridge as follow:

    

   1. Click here to print the chart. [185KB/ 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 the details of how to replace the toner cartridge.
5. If the issue continues, the drum unit may be damaged. Put in a new drum unit of the color causing the issue.
   > Click here to see the details of how to replace the drum unit.