First clean the inside of the printer as there might be tiny strips of paper that cling to the print head assembly, second open the scanning area and clean the camera as tiny lines came from dust that was being read by the camera as an image.
SOURCE: Black lines down page
It must be the black pcu , the cleaning blade picks up dirt and causes these lines , it can also be the black developer giving you trouble , if you want be very carefull aand strip the pcu open you will see the lines only on the inside and not from outside , then you will know if it is developer or the cleaning blade
SOURCE: Black Lines running down the right side outside of the print area
It may be the fuser. Take it out and inspect the roller on it:
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe
I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309
SOURCE: 5100cn - verticle line omitted on magenta test page
sound like the drum could be the problem have you replaced that? if the fuser was the problem it would have the toner but would not have been fused or had marks on the page. this would be my best on this issue
SOURCE: HP Officejet J5780 All-in-one Injet prints a grey
lift the feed area and look at the small glass plate where the auto feed paper is actually scanned. That needs a good cleaning. Since the paper runs across it even a tiny little obstruction such as paper left from a paper jam or a dot of ink from that pen you used to unstick that last paper jam (maybe its just me??). That one dot turns into a line when the paper rolls across it. Clean well and the line will dissappear.
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