Sounds mechanical, though not a lot of information. Have you checked the operation of the feed mechanism? If not remove the paper tray and cover, put in a few sheets of paper and set the side guide. Print and watch the way things happen (may need a flash light). The locks at the sides will rotate, the bed will hinge up to put the paper in contact with the rollers, which will draw the paper into the printer. This should be a smooth operation, no stutters other wise you have a problem some where. Let me know if you like what happens.