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Open the scanner lid and clean the narrow glass in the left-hand part of the scanning area. Look for remains from ink or corrector at the far end and wipe them out. The narrow glass should be entirely clear to make good copies from the feeder.
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.
Sounds like the issue is with the scanner bulb. May not be moving across or warming up to full capacity.
Make sure the scanner is plugged in directly to the wall and not into a surge protector or a power strip. If problem is still there and you are in warranty you will need to replace the unit. If OOW then you should call and see if you can repair or upgrade the unit at a discounted price. If you want to speak to someone in English tell them you want mac support - they are in Canada.
Try a sky scan (No paper on glass and lid up) watch the scanner to see if it is smooth or a somepoint jumpy. If not smooth, you will have to open it up and 1 of two things, dirty and needs lubracation, silicone grease is best vasoline will work. OR 2 the drive belt is loose because the spring tensioner is broken or the belt is dammaged. Good luck