This could be caused by a couple of things. The first one is the toner cartridge. A defective or low toner cartridge can cause light "grainy" looking copies. If you have a spare toner cartridge try that first. The second possibility is dirty scanner optics. The scanner bar that lights up under the glass and moves back and forth has 3 mirrors on it. When they get dirty is causes your scanned image (before it gets copied) to appear light and patchy looking. The glass must be removed by removing the 4 screws on the left hand side. Then the scanner can be pulled out and the 3 mirrors cleaned. If you have the machine hooked up to a computer to be able to print then these mirrors will NOT affect PC prints. If PC prints are grainy then that would point to the toner. The dirty mirrors will only effect the copies.
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