Find out how to Fix Brother Printer Drum Error if you are experiencing Brother printer errors. Follow the steps below to do so.* Open the front cover of your printer and remove the drum unit and toner cartridge assembly as well.* Press the green lock lever to break the toner cartridge out of the drum unit.* Take out the newly packaged drum unit.* Now, attach the cartridge to the new drum unit and the green lever will lift automatically.* It is time to adjust the new drum unit and the toner cartridge back in the machine.* Then, press "Clear" or "Back" and then the triangular icon to confirm that a new drum is being installed.* You will see "Accepted" on the LCD display if you have completed the changing task successfully.* In the end, close the front cover and start using your Brother printer once again.