It moves, from about 1/4 of the side down the left side of page, to center of left side of page to 3/4 of the side down left side of page. The smudge is printed, i.e. it cannot be smudged more with your finger after it prints.
It seems like your PCU's are dirty and are picking up extra toner. Take them out and look at the green rollers, any extra finger prints or dirt on them? Clean them with a clean paper towel.
Also, check your transfer unit below the PCU's, that may need cleaning or replacing. You can pull that out after removing both PCUs, turn the little screww and look at it. That can also be cleaned with a cleaning wipe or a damp paper towel. There's a little tab that you can turn to free the rollers (they'll still be a little tight) bu then you can turn the rollers to expose more surface area.
Good luck. Be sure to rate the post if it works for you.
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A repetitive defect at 2.2 inches indicates a bad fuser hot roller film. This is the teflon coated plastic film that covers the heating element and assists in bonding toner to the page. It will require replacement, unless you can see that something is stuck on the film., however in most cases based on the age of the printer you will likely need to replace the film.
Problem is either the cartridge or the fuser. Put paper in the manual feed tray(tray 1) Print something. When the paper gets 1/2 way into the printer, open the top cover. Pull out the toner, look down at the paper. If it has the smudge replace the toner. If no smudge, replace the fuser.
Very nice trouble shooting. The image defect you describe point to the OPC or drum unit this is essentially the toner cart. In your case black. Measureing the distance between repetitive defects is a sure way of diagnosing problems such as yours. Again nice work.
Google repetitive defect ruler for your model to help in the future.
There sounds like there is somthing in the path of the printhead. Using a flash light, remove back cover of machine and look for a small piece of paper,etc. Be careful not to jam anything in to th machine. It may take running a thick piece of paper through manually with your hands to remove the object.
Maybe something attached (corrector fluid or adhesive)on drum (green cylinder - don't touch it!) or more probably the fixing film on the fusing unit is damaged (probably some paper clip left over input bin, or trying to remove a paper jam with some sharp-pointed thing)
If you have some other printer like this around, try with another print cartridge, if error persist , the fuser film is damaged...