Plustek Opticpro A320E Flatbed Scanner - Manual (Page 176)

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when the alignment might be required. You need to align the scanner only if parts
of the scanned document are missing from any of its edges. For example, the
heading of a document might be missing from the top edge after the document has
been scanned.
1. Place a document face down onto the scanner glass and align the top left
corner of the document with the arrow on the reference mark.
2. Right-click the icon in the Dock, and then choose Scanner Utility in the
pop-up menu that opens .
3. The Scanner Utility window opens. Find the Initial Scanning Position
Alignment section and select Flatbed as the scan source.