If there is no margin or if there is a solid image area near the leading edge of the original, create a margin of at least a 5 mm (0.2 inches) on the leading edge. Otherwise, the paper might wrap around the drum, or the paper exit pawl might become dirty and cause black lines on prints.
If you use originals that have bold letters or solid images at the leading edges, you might get prints with dirty edges. If this is the case, make sure that the edge with the widest margin goes in first, or raise the printing speed.
If you use a pasted original, make sure that the pasted parts stick to the base sheet. If the thickness of the pasted original is more than 0.2 mm and the space between the pasted parts is less than 2 mm (0.08 inches) a shadow might appear on the pasted parts.