Even if you correctly place originals on the exposure glass, margins of a few millimeters on all four sides of the original might not be copied.
Missing original area

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3 mm (0.12 inch) ± 2 mm (0.08 inch)
3 mm (0.12 inch) ± 2 mm (0.08 inch)
3 mm (0.12 inch) ± 2 mm (0.08 inch)
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For details about printable image area, see Printable area.