MF663MFC artifacts on feeder scans

[lucianb]

I just bought an imageCLASS MF663MFC printer/scanner. It works well except running photos through the feeder. When a photo has a bright area such as sky or a white wall or shirt, the image comes out with gray/brown spots all over the white area. The spots are irregular patches. This does NOT occur when I scan the same photo on the platen. 

I have done a lot to try to solve or work around this. I have cleaned the scanner surfaces, updated to the latest firmware, used different JPEG compressions, tried PNG, scan sizes, scanning from the computer or printer, etc. Always the same. 

Since the blotches are only on images that have white-ish areas, it does not seem to be associated with dust. And since no amount of changing how I scan or what file type I use makes any difference, I suspect the problem is in the actual scanner hardware.

Any thoughts of what might work? Is there a way to go backward in firmware and try some older ones?

[lucianb]

Here is an example scan showing the artifacts. They change for each picture and for each scan but are always there in these very bright areas. 

[jdesab]

I have the exact same issue. Blotches only show when using the feeder. Is there a fix for this? I cannot use this scanner for my photo library unless I can get this fixed

[lucianb]

I have heard nothing since posting. Anyone else?

[jdesab]

I tried cleaning rollers (as indicated on the scanner), platten, keeping images completely dust free. Yet on bright, near white portions of all my photos, dark spots and streaks appear. No where else. Canon, can you please explain why this occurs? Can anything be done to eliminate this from the scans?