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How to replace the Drum Unit of Brother MFC-8440/MFC-8440D Multifunction Printer

  1. Open the front printer cover, and then you must take the exhausted drum unit out of the MFC-8440/MFC-8440D by grabbing its front side and pulling straight towards you.
  2. Detach the still usable toner cartridge from the exhausted drum unit by pushing down the colored lock release lever, which is located on the right side of the drum unit, and pulling the toner cartridge slowly towards you.
  3. Unpack the new drum unit, but be careful not to touch the sensitive surface of the photoconductive drum, which is located on the top side of the drum unit.
  4. Install the toner cartridge into the new drum unit, but make sure that it clicks securely into place. Please note that the colored lock release lever will be automatically raised, but only if the toner cartridge is installed correctly into the new drum unit.
  5. Insert the new drum unit into the printer, and then press the [Clear/Back] button.
  6. Confirm the new drum unit installation by pressing the [1] button, and when the following message ''Accepted'' appears on the LCD, you must close the front cover of your Brother MFC-8440/MFC-8440D Multifunction Printer.