The following types of originals can cause jams, or may itself be damaged:
Stapled or clipped originals
Perforated or torn originals
Curled, folded, or creased originals
Originals with any kind of coating, such as thermal fax paper, art paper, aluminum foil, carbon paper, or conductive paper
Originals with indexes, tags, or other projecting parts
Thin and soft originals such as translucent (vellum) paper
Bound originals such as books
Damp originals
Originals that vary in thickness
Originals with thick leading edges
Originals with wet ink or correction fluid
Carbon-backed originals
Originals not made of paper (such as glass, metal)
Originals with a roll diameter smaller than 300 mm (11.9 inches)