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How to repair the document feeder on an HP Officeject J3680 all-in-one?

Clean the pickup roller Unplug the power cord from the product, and then remove the pickup roller.Dab a lint-free cloth in isopropyl alcohol (electronic parts shops usually sell this), and then scrub the roller.Using a dry, lint-free cloth, wipe the pickup roller to remove loosened dirt. HP have a video on their web site.