Check the following points to solve the problem:

1. To get the best print quality, we suggest using the recommended paper. Check that you are using paper that meets our specifications. Click here to see details of the recommended paper.
    
2. The drum units or toner cartridges may not be installed correctly. Check that the drum units or toner cartridges are installed correctly.

    

   • Click here to see how to install the drum unit.
   • Click here to see how to install the toner cartridges.

    

3. Wipe the windows of all four LED heads with a dry lint free soft cloth. Click here to see how to clean the LED head.
    
4. Wipe the scanner glass strip with a dry lint free soft cloth. Click here to see how to clean the scanner glass strip.
    
5. Make sure that foreign material such as a torn piece of paper, sticky note or dust is not inside the machine and around the drum unit and toner cartridge.
    
6. Clean the drum unit. Click here to see how to clean the drum unit.