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1-apply fesh paper it must be out of humidity and wet. 2-confirm smoth motion of optical system. 3-deformed press roller-replace it.. 4-paper conveying section drive problem-check the gears and belts and if necessary grease them.
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You can use an aspirator to clean the printer inside, and if you have a little experience you can clean the blade inside the cartridge with isopropylic alcohol, and the drum too. How many times was the cartridge refilled?