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Hello I just figuered out this problem. When the paper is feed thru the ADF ( Automatic Document Feeder ) there is a plastic piece with a plastic film. Check to see if #1 that plastic film is clean and #2 That the Film is not bent and created a crease which is the line that shows when try to print or scan using the ADF. Hope this helps
There is something on your scanner glass. Clean the glass with glass cleaner. If this happens when using the automatic document feeder, open the top side cover where the paper feeds into. There is a narrow glass strip there. Clean that as well.
If this fails, the scanner head has a bad sector on the CCD and will need to be replaced. You will probably find that it will be cheaper to replace the printer entirely if that is the case.
Is the scanner scanning normally otherwise? Try scanning a printed matter with white background and if it is okay, then the streaking may be because of excess brightness chosen. Check if the paper movement is at constant speed. If it is smooth paper, it may slip and the same area may scanned again, appearing like a streak.