What should I do to avoid paper jams when loading paper in the input trays?

Never add or remove paper from either input tray during printing. Before loading, remove all paper from the tray and straighten the stack, do not fan the paper, and use only paper that is not wrinkled, folded, or damaged. Also, adjust the paper guides to the correct size and do not overfill the tray. (Pages 16, 19)