To clear the "Drum Error" message on a Brother printer, you can follow these steps:
Open the printer's front cover: Locate the front cover of your Brother printer and open it. This will give you access to the drum unit.
Remove the drum unit: Carefully pull the drum unit and toner cartridge assembly out of the printer.
Separate the drum unit from the toner cartridge: Press the green or blue lever on the drum unit and separate it from the toner cartridge.
Clean the corona wire: Look for a green or blue tab or slider on the top of the drum unit. Slide it back and forth several times to clean the corona wire inside the drum unit.
Reassemble the drum unit and toner cartridge: Put the drum unit and toner cartridge back together, ensuring they fit securely.
Reinsert the drum unit: Slide the drum unit and toner cartridge assembly back into the printer and close the front cover.
Reset the drum counter: Depending on the Brother printer model, you may need to reset the drum counter to clear the "Drum Error" message. The steps for resetting the counter may vary, so consult your printer's user manual or Brother's support website for specific instructions.
Test the printer: After completing the steps above, perform a test print to ensure the "Drum Error" message is no longer displayed, and the printer is working correctly.