Question about HP 477dw PageWide Pro

There is only one "scan module" in this model.
When you insert the sheets through the feed tray, the sheets are "pulled" over the scan module. This remains fixed in the start position (usually) on the far left under the glass.
When you place the sheets on the scanner glass, it is not the sheets but the scan module that is pulled under the glass (and thus under the sheets) and the data is read in this way.

First of all, check that there is no dirt on the glass, on the very outside (left) edge, where the scan module is "parked" under the glass. This is where the sheets are pulled over the scan module when it is fed in. Of course, check first at the level where the black stripe is ;-)
In most cases the problem is solved in this way, because such smudges do occur - among other things often when writing on a paper with a pen (marker or Edding) and then scanning "not quite dry". If necessary, simply clean with a little Ajax or other streak-free glass cleaner. If a waterproof sharpie has been used, it may also be possible to clean with alcohol or thinner and a clean cloth.

If you notice any soiling, but it is "under the glass", then it is a warranty case.

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