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How to replace the Drum Unit of Brother MFC-7345N Multifunction Printer

  1. Gain access to the exhausted drum unit by opening the front printer cover.
  2. Take the exhausted drum unit along with the attached toner cartridge out of the printer by pulling it slowly towards you.
  3. Detach the toner cartridge from the exhausted drum unit by pushing down the colored lock release lever (on the front side of the drum unit) and pulling the cartridge out, but avoid touching the contact area of the toner cartridge.
  4. Unpack the new drum unit.
  5. Align the toner cartridge with the new drum unit, and then push it down until it clicks into place and the lock release lever is automatically raised. Please note that you should avoid touching the sensitive photoconductive drum, which is located on the top side of the drum unit, otherwise, the drum unit will be permanently damaged and a variety of print quality issues will occur.
  6. Look at the top side of the drum unit and locate the green cleaning tab.
  7. Hold the green tab and slide it to the end of the cleaning channel.
  8. Slide the green tab back to its original position.
  9. Repeat step 2 and 3 several times.
  10. Make sure that the cleaning tab is back to its original position.
  11. Insert the new drum unit along with the attached toner cartridge into the printer, and then confirm the new drum unit installation and reset the drum counter by pressing the [Clear/Back] – [1] buttons. Finally, you must wait for the following message ''Accepted'' to appear on the control LCD, and then close the front cover of your Brother MFC-7345N Multifunction Printer.