Even if you place originals in the ADF or on the exposure glass correctly, margins of a few millimeters on all four sides of the original might not be copied.
Missing Image Area
Leading edge: 4 ± 2.5 mm (0.16 ± 0.10 inches)
Trailing edge: 10.0 mm (0.40 inches)
Left edge: 4 ± 2.5 mm (0.16 ± 0.10 inches)
Right edge: 4 mm (0.16 inches)