Follow the steps below to resolve the issue.

1. The drum unit may have glue from a label stuck on the OPC drum surface. Clean the drum unit. Click here to see how to clean the drum unit.
    
2. Try making several pages of blank copies of a clean sheet of white paper to check if the issue is resolved. If the issue still remains, go to Step 3.
    
3. Follow the steps applicable for your case:

    

   • If the dot pattern repeats every 1.5 in. (39 mm) with about 7 - 8 dots down the page, the toner cartridge may be causing the issue, the toner cartridge needs to be replaced. Click here to see how to replace the toner cartridge.
     

     Toner part numbers are TN-720 (standard yield) and TN-750 (high yield) TN-780 (Super High Yield). If you find that your retailer does not carry the specific supplies and accessories you are looking to locate, you can purchase them by calling our toll free Accessory Line on 1-877-552-MALL (6255) or shop on-line at our website at http://www.brothermall.com

      

   • If the dots are appearing randomly on the page, check for loose toner inside the machine and around the drum area. A toner cartridge that is leaking or has leaked inside the machine will need to be replaced. Click here to see how to replace the toner cartridge. Do not remove the toner cartridge from the Brother machine until you are ready to replace it. Excess toner can be cleaned with a soft, dry, lint free cloth before replacing the cartridge. Click here to see how to clean the drum unit.
     

     If you have a toner cartridge that is leaking, call Brother Customer Service at 1-877-Brother (1-877-276-8437) Monday through Friday, excluding holidays.

4. If the issue still remains after trying the above steps, the drum unit may be damaged. Put in a new drum. Click here to see how to replace the drum unit.
   

   The part number for the drum is DR-720.  If you find that your retailer does not carry the specific supplies and accessories you are looking to locate, you can purchase them by calling our toll free Accessory Line on 1-877-552-MALL (6255) or shop on-line at our website at http://www.brothermall.com.