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If when you copy or fax something and it has a black line running down the page, it is often caused by a dust, dirt spot or mark on the glass where it is being scanned. The easiest way to resolve this is by cleaning the feeder glass that reads it with a clean cloth.
A black line down a scanned page indicates a dirty scan glass. Lift the top of you scanner like you would putting a page or book down to scan. On the end of the scanner that has the document feeder you should see a thin piece of glass the is separate from the larger glass pane. This is the document feeder glass. Now check it over for a very small mark of ink or dirt. You can use regular glass cleaner to wipe this glass just spray it on a piece of cloth not the scanner then wipe. You may have to wipe and then try scanning several times if the ink or marker is died on. while you are cleaning you should also clean the main glass pane, it will make the scans clearer and crisper.
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Most likely the scanner has dirt on the glass that is over the imaging array or the glass may be scrached. If the glass is scratch, the imaging CCD array need to be replaced. If you do not scan the rear of your documents, you can swap the upper with the lower in the case that one is scratched.
The imaging array are the green long bars, one at the bottom of the paper path halfway inside the scanner and the other is above it. Look closely for a small spot of black toner or dirt stuck
on the glass. Take a soft cloth, wet it with water or alcohol if needed and clean the glass.
Pass you finger over the glass, try to feel if all of the toner or rubber residue has been removed.
You might try looking at the specific area were your documents image is getting the line. It will
help you pinpoint where you should clean. CAREFULL not to push on the glass as this
might break it. Hope this helps.