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While the line is showing up on the output pages. Stop printing and put paper in the manual feed tray (tray 1). Start printing again. As a page gets pulled into the printer about 1/2 way open the top cover. Pull out the toner and look at the page inside the printer. If it doesn't have the grey/black line, get the fuser replaced. It is defective.
It's never going to be perfect (unless the background is quite light in colour), because the copier basically "sees" the coloured background as "gray", and the darker the background the more "gray" it looks. Try setting the original type to "photo" mode, and then adjusting the exposure a little lighter/darker....that's all you can basically do.
if you have a laser printer you may need to clean the printer or install a new drum cartridge, if it is ink-jet you will have to clean the bottom of the ink cradle it sound like you getting grey background from a toner/drum cartridge.
If the whole page is covered with stuff that's not supposed to be there, and that stuff sometimes changes shape or color on each page. then you look to the DRIVERS and connection 1st. Corrupt printer memory can also cause this.
If the corruption tends to be consistent across print jobs and it's only on certain spots on the page, you can start to look for mechanical defects.