How to Clean the Roller Cartridge on a Brother DCP 7020

1. Print out a blank page from your printer and note the location of the smudges that have been affecting your printing.
2. Remove the drum unit and toner cartridge assembly from the printer. Remove the toner cartridge from the drum unit and set it aside.
3. Put the sheet you printed in front of the drum unit so you can predict where on the roller cartridge the dirt resides.
4. Turn the black gear on the left side of the drum unit until you find the grit that lines up with the marks on your paper.
5. Moisten the cotton swab with the isopropyl alcohol, then gently dab the dirt away.