Please check the following points:

• (For models with Automatic Document Feeder only)
  Wipe the scanner glass strip with a dry lint free soft cloth.
  > Click here to see how to clean the scanner glass strip.
   
• Clean all four corona wires (one for each color) of the drum unit by sliding the green tab.
  > Click here to see how to clean the corona wires.
   
• Make sure each corona wire's green tab is at the home position.
   
• One of the toner cartridges may be damaged. Replace the toner cartridge that matches the color of the streak or band.
  > Click here to see how to replace the toner cartridge.
   
• The drum unit may be damaged. Put in a new drum unit.
  > Click here to see how to replace the drum unit.
   
• The fuser unit may have a smudge mark. Contact our Customer Service Center.