Red smudge scanned image

Harvey Young

Registered
I have a Canon LIDE scanner, which I purchased a little more than a year ago.

Color images from documents that I have scanned show a pink smudge (about an inch wide) running from top to bottom on the left side.

An Epson scanner that I had a few years back had the same problem.

Can anyone guess what might be causing this problem?
 
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