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HL-4040CN > FAQ's & Troubleshooting > Maintenance > faq002256_001
If you have print quality problems, clean the drum unit as follows:
DO NOT use flammable substances, any type of spray, or an organic solvent/liquid that contains alcohol or ammonia to clean the inside or outside of the machine.
Turn off the printer power switch. Press the front cover release button and then open the front cover.
Hold the green handle of the drum unit. Lift the drum unit up and then pull it out until it stops.
Release the gray lock lever (1) that is on the left side of the printer. Pull the drum unit completely out of the printer using the green handles on the drum unit.
Hold the handle of the toner cartridge and pull it out of the drum unit. Repeat this for all the toner cartridges.
We recommend that you place the drum unit on a clean, flat surface with a piece of disposable paper underneath it in case you accidentally spill or scatter toner.
DO NOT clean the surface of the photosensitive drum with a sharp object.
When you put the drum unit in the printer, match the green guides (1) of the drum unit handle to the green arrows (2) on both sides of the machine.
HL-4040CDN, HL-4040CN, HL-4070CDW
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