Please check the following points to solve the problem:
NOTE: Illustrations shown below are from a representative product, and may differ from your Brother machine.

1. Check that you use the paper that meets our specification. Click here to see the details of the recommended paper.
   
   
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. Make sure that the fuser cover (1) inside the back cover is closed properly.
   
   
   
4. Make sure that two gray levers inside the back cover, one on the left-hand side and one on the right-hand side, are pulled down.
   
   
   
   
5. Make sure that the media type settings in the printer driver match the type of paper you are using.