Follow the steps below to clean the drum unit:
     
NOTE: Illustrations shown below are from a representative product and may differ from your Brother machine.
                             

1. Press the cover release lever to open the front cover.
             
   
                    
2. Take out the drum unit and toner cartridge assembly, and then take out the toner cartridge from the drum unit.
3. Put the print sample in front of the drum unit, and find the exact position of the poor print.
               
   
                 
4. Turn the white gear on the drum as you check the surface of the OPC drum (1).
              
   
               
5. When you have found the mark on the drum that matches the print sample, wipe the surface of the OPC drum with a

   dry cotton swab that is lightly dampened with isopropyl alcohol until the dust or glue on the surface comes off.
                      
   

   • The OPC drum is photosensitive so do not touch it with your fingers.
   • Do not use a scrubbing or wiping motion because this might damage the drum.
   • DO NOT clean the surface of the OPC drum with a sharp object, such as a ballpoint pen, because this might cause permanent damage to the drum unit.

    

6. Put the toner cartridge back into the drum unit until you hear it lock into place.
   If you put it in properly, the lock lever will lift automatically.
        
   
                   

7. Put the drum unit and toner cartridge assembly back in the machine.
                           
   
                           

8. Close the front cover.