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Sounds as if the drum needs to be replaced if it does this on copies and prints. If it just happens on copy when using the document feeder then try cleaning the narrow piece of glass that is located just to the left of the large piece of glass.
"dk" means the the life black drum is over. You need to replaced the drum and blade. Or you can replaced the whole drum cartridge. The line that you are getting from one of the blades, more likely from the black drum. Pull out all the drum check if there is toner on the drums.
Are the lines horizontal or vertical? DO you get lines on B/W copies (black and white) also? If you try to copy a blank white page do you get the lines? Does the toner / lines wipe off after the copy comes out? If the toner wipes off after the copy comes out you have a problem in the fusing unit ( the hot area that fixes the image onto the page). If the lines are vertical then you have something inside the device that is dragging across the page as it goes through the device. If the lines are horizontal then you it could be the drum cleaning blade, the transport blade, or charge roller. The noise could be that one of the blades are bouncing. It could be that a gear is worn. Please give more info on the problem to better help.
the nealy black copies sounds like the drum is going, try adjusting the exposure to light, if it comes out with the whole page the same way but just lighter than change drum. White line sounds like there is something on the coronas.
Either the Fuser/Heating unit is bad, or the optics are dirty.
What you can try to do to narrow it down, is to make a copy but.. STOP the machine in mid process by turning the power off. This will create a paper jam in the machine. If timed properly, your copy should be 1/2 way through the machine with some image on it. (Make sure that you are trying to copy something on the glass). The copy is not FUSED, so the toner will wipe off so be careful not to rub the page against your clothes/sleeve. IF the black line is on the page at this point, the problem is not in the fuser but probably in the fiber optics. If the problem is in the optics and will need to be cleaned. If the black line is NOT on the page at this point, then the fuser unit is bad and needs to be replaced.
Let me know how the copy comes out when you stop the machine in midway and I can see if i can give you any more suggestions. Good luck.
I have the same problem that you are haveing, I changed the ink ,both black and color, and it hasen't helped any, I wanted to get a new copy and printer machine but I don't want to get one and have the same problem. I have runined a lot of print paper trying something else new. I am open to all suggestons. thanks Ken.