You most likely have some ink residue on the pickup, feed, or registration rollers for the problem to be on the back of the page. Use a flashlight and a q-tip moistened with isopropyl alcohol to swab all of the rollers in the paper path and see where the higest concentration is. You could also try to LIGHTLY dampen a sheet of paper with alcohol and print a "Blank" page a few times with it then do the same with fresh paper.
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When copying with the automative document feeder, I get a vertical line down the right side of the page. This does not occur when I copy from the glass platen.
When copying from the automatic document feeder, I get a vertical double line down the right side of the copied page. I do not get this when I copy from the glass platen.
When the print head is in the center of the machine it is dropping black ink on the lower exit roller, the 1/4 inch black on the back side od the print or copy will go away after 8 to 10 pages after the roller cleans itself. The ink and print head have been changed with no improvement, it seems that the black ink is being drawn out while the machine is at idle.
Having the exact same problem. Changed ink cartridges, did a deep cleaning and still a dark black stripe down the back of the paper after sitting for a while. The Problem goes away after 8-10 pages, but resumes as soon as you pause printing.
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