Even if you place originals in the ADF or on the exposure glass correctly, margin of a few millimeters on all four sides of the original might not be copied.
Missing Image Area
Leading edge: 4.2 ± 1.5 mm (0.17 ± 0.06 inches)
Trailing edge: 0.5–6.0 mm (0.02–0.24 inches) (3.0–6.0 mm (0.12–0.24 inches) in Duplex mode)
Left edge: 0.5–4.0 mm (0.02–0.16 inches)
Right edge: 0.5–4.0 mm (0.02–0.16 inches)