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The LED array probably needs cleaning. This is located on the lid that you open when changing the drum/toner and is a dark coloured bar going left-right across the lid. Clean this with a cloth. Also check the opening in the drum where you can see the green cylinder from the top for any small obstructions and remove if necessary. Any obstructions or dirt on the LED will line up with the print defect on the page and should be easy to remove. Be careful not to damage the green cylinder.
vertical lines can be caused by several things. Since you said that cleaned the rollers, then here are other options 1: Most common is a bad toner cartridge. 2: try cleaning the fuser entrance guide. 3: could be a defective formatter - formatter replacement the fix. 4: worn fuser. fuser replacement is the fix.
horizontal lines are probably repetitive down the page, and are usually caused by a defective toner cartridge or fuser assembly. occasionaly a transfer roller will cause it as well.
Toner loves to get baked onto the fuser and cause all kinds of print problems. Not much you can do but to replace the fuser when this happens.
1 - take out all consumables 2 - use canned air to clean interior (do it outdoors) 3 - spray toner cartridges to remove stray toner (keep them connected to the drums, do not separate) 4 - make sure toner carts are properly installed and locked down
Possibly the cartridges have been put in the wrong place, you need to clean the machine out, as the wrong toners will be on the wrong drums, you may need to replace the drums and get a new transfer belt.
Unfortunately your drum unit is shot. The mechanism that cleans excess toner from the drum surface is worn out or has developed a problem. The materials needed to repair are generally not available. If this is happening then the surface of the drum is probably near the end of its usable life anyway. Save yourself a lot of grief and aggravation. Bite the bullet and buy a new drum unit. Office Depot, Staples, etc. usually offer them at about $105.
Cleaning a laser printer can solve minor problems, maintain print quality, and prolong periods between professional cleanings. Clean your printer when print quality deteriorates or when you change toner cartridges.
Manually Cleaning Inside the Printer
1. Unplug the printer from the surge suppressor.
2. Remove the internal paper trays.
3. Remove the toner cartridge and place it on a piece of scrap paper.
4. Clean inside the toner cavity with a dry, lint-free cloth and brush (if a brush is supplied with the printer).
5. Clean the printer mirror gently with the brush. Don't touch the mirror if a brush isn't provided.
6. Wipe away dust and spilled toner. Remove paper fragments.
7. Clean the rollers, but don't touch the sponge roller.
8. Replace the toner cartridge.
To remove unfused toner from the rollers following a paper jam, print 5 to 10 blank pages on scrap paper.
Wipe toner from clothing if necessary, then immediately wash toner-soiled clothes in cold water.
Go to your printer manufacturer's Web site (see Related Sites) for detailed cleaning instructions.
Don't use any liquid cleaners inside the printer.
Initiating Automatic Cleaning Through Printer Software
1. Open the printer software by double-clicking on a printer icon or specific printer utility program, or opening a document and then selecting Print from the File menu.
2. In the printer software, look for a button labeled Options, Troubleshooting, Toolbox, Printer Utilities or something similar. (This varies by manufacturer.)
3. Follow the instructions on the screen.
4. Repeat the cleaning process if the results aren't satisfactory.