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Line on copies

Color Laser Jet Pro MFP M479fdw
Microsoft Windows 10 (64-bit)

I am getting a line down the page when I make copies using the document feeder.  I've tried cleaning what I can but I can't get rid of the line.  Where else can I clean?

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Line on copies

The only place that will cause a line is debris on the small slit on the left side of the scanner glass. The challenge is that even nearly invisible debris like a sock of adhesive from a post it note can distort the scan and cause a line

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Line on copies

When you use the document feeder, I don't think it even passes the scanner glass.

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