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When a black line appears on scans and copies, there are two main possible causes.
One is typical of black lines appearing only on scans and copies made through a document feeder, but not appearing when a single original is scanned or copied from a glass sheet.
The other type of black line appears on all photocopies and scans, even when not made from a document feeder.
If it is the type that does not show up in photocopies made from the glass sheet, then try this:
Open the top of the printer, so that the glass sheet is showing. At the left, you should see a narrower strip of glass.
Take a fresh paper towel, and moisten it with warm water a little. Rub the narrower strip of glass to the left, firmly, many times over, with the moistened paper towel.
Some black fleck or flakes should come off onto the paper towel.
Then wipe clean and dry with a dry paper towel, before the glass strip on the left dries.
Then try photocopying again.
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