10. Rotate the wheel at the end of the drum unit while pushing the shaded part, as shown in the illustration, to
find the mark or foreign material.
To avoid print quality problems, DO NOT touch the surface of the drum unit, only the wheel on the
11. Wipe the surface of the drum gently with a dry cotton swab until the mark or foreign material on the surface
DO NOT clean the surface of the photosensitive drum with a sharp object or any liquids.
12. Install the toner cartridge and drum unit assembly back into the machine.
13. Close the front cover of the machine.