When I scan or copy using the 7855 feeder, blue stripes appear at the bottom of the front of the file, but the back of the file is normal.
Scanning or copying from a desk is normal. I have replaced small glass and cleaned it.
There is also a sensor that you could try cleaning please click here for the solution. If you are still having issues after trying these steps, I suggest that you call into our support department for assistance @ 1-800-821-2797 or 1-800-835-6100.
Once you open the article I added in my original post it will be the 5 solution listed.