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Try cleaning the drum cylinder with alcohol and a cotton ball. Then swipe the corona wire cleaner back and forward making sure to return it to the correct place. Try a print. If it is improved - replace the drum at earliest convenience. If not improved - could be dirty laser lenses or problem with the fuser.
The Brother HL 2040 laser printer has a toner cartridge that supplies toner to the drum assembly so that the printer can print properly. When the LED on the front of the printer indicates you are low on toner, you will need to replace the toner cartridge to maintain good print quality. Fortunately, the toner cartridge can be replaced without any special tools.
Instructions Things You'll Need:
* Replacement toner cartridge (part number TN350 or TN360) * Paper towel or scrap paper
Grasp the front cover of the printer and pull it toward you to open the toner door. Reach into the printer and grab the combined toner cartridge/drum assembly. Lift up slightly and pull it out of the front of the printer.
Place the cartridge and drum on a paper towel, spare sheet of paper, rag or other surface that can get dirty. Loose toner particles may spill from the cartridge.
Press the blue locking lever on the cartridge/drum unit to unlock the toner cartridge from the drum. Lift the toner cartridge up and away from the drum unit. Dispose of the old toner cartridge in accordance with your local regulations. Seal it in a plastic bag to keep loose toner from spilling.
Gently shake your new toner cartridge back and forth a few times to distribute the toner evenly across the width of the cartridge. Remove the plastic protective cover from the bottom of the cartridge.
Place the new toner cartridge onto the drum unit and press it down gently until it locks into place. The blue locking lever will automatically click into place. Verify that the toner cartridge is securely connected to the drum.
Locate the corona wire cleaner tab at the front of the drum unit. Slide it back and forth several times to improve the print quality of the drum. Set the tab back in the home position when finished.
Slide the combined toner cartridge/drum unit back into the printer and close the front cover.
Sounds like the toner cart. has toner packed at one end and possibly the drum cartridge is dirty. Remove both from the printer, separate the 2 and vacuum the drum cart. - them blow it clean. Run the drum wire cleaner (purple/blue tab on front edge of drum cart.) back & forth a number of times. Blow out the inside of the printer to get out toner dust. Reinstall toner back into drum cart, then hold GO/Control button down until all lights are on, let go, reinstall toner&drum back into printer, close door. Power down - then back on. That should do it. Worst case, you'll have to replace the drum unit.
Could be that there are a mark on the drum itself or some dirt, remove the drum unit and inspect the surface , by rotating the drum , becareful not to touch the drum as it will leave marks on the surface