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are you printing from Doc feeder or glas?? if from feeder then try to make a copy from the glass, does it still do it? yes problem is with drum. No? problem is with the small scanning glass to the left, look carefully see if any spots or lines on the 1inch glas --- clean it
A line all the way down the page means you have something blocking the imaging module like a bit of dirt or a piece of torn paper. Look in the area where the white line is, or it also could be toner being scraped off the page near the fuser, in that case you may see a smudge next to the line.
I dont know what kind of copier you have but white vertical lines are virtually always caused by a dirty charge corona.There is usually a little plastic handle, blue, green or grey, that cleans the charge corona.pull it out ONCE, push it back in and try another copy.If you have an operators manual, it should have instructions for cleaning the charge corona.Good Luck, O'scope
I had a hp 3050 yesterday with two vertical lines running down the page when making a copy. All I had to do was to pull open the top cover where you put the paper you want copied and cleaned the glass strip with a rag and alcohol and the lines were gone.
Is there any chance you can post a scan of one of your faulty pages. This would help to assess the fault.
If you print several pages, does the image move further and further down the page with each copy?
Is the white band repeated down the page? If so measure the distance between each band - this will help identify the faulty component.