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.
0.5 - 4.5 mm (0.02 - 0.18 inch)
0.0 mm - 4.0 mm (0.02 - 0.16 inch)
0.5 - 3.5 mm (0.02 - 0.14 inch)
1.0 - 5.0 mm (0.04 - 0.20 inch)