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if you mean making a copy from the automatic document feeder check the slit glass (the thin narrow glass beside the big platen glass) for debris, white out, dirt, etc... a small dot on that glass will make a line on the copy.
Most likely a fax has been sent or a page copied with 'white out' (Liquid Paper), still wet on the page. As the page feeds over the scanner, (a narrow strip of glass that runs across the width of the page along the feed path) the wet liquid paper comes off on the glass as a thin line and dries. Thereafter, when copying, scanning or sending a fax, the scanner light does not go through the liquid paper streak and the result when printed is a thin vertical line that runs the full length of the page.
If this is your problem: follow the path that the paper travels when sending a fax or making a copy, until you find the scanner (narrow glass strip). Take a clean, soft cloth and a small amount of methylated spirit (or white spirit) and remove the now dried Liquid Paper from the glass. Clean the whole strip ensuring that the glass is left clean and dry.
There are two scan modes when copies are made.When you make copies through ADF you originals go past small **** glass located to the left of the main exposure glass.Any small mark on this **** glass( correction fluid mark,ink mark,small scratch,dust particle and so on)will show as a line on your copy.So to get rid of these vertical lines on your copies you need to clean this small exposure glass.
If the marks look like brushstokes all over the page, then it most likely needs a drum GPR-6. Black marks can be caused by a dirty **** glass (the thin one) as well. the easyest way to tell is if the black lines are only on copies that went through the feeder and not on print jobs, faxes,or copies made off the glass then the **** glass needs cleaned.