Epson GT-12000 User Manual page 38

4. Turn the document guide over, and lay it on the document
table with the document guide holes over the screw holes
in the scanner. Make sure the larger document guide hole is
on the right and your document faces down.
5. Close the cover and scan according to the directions in your
software manual.
Note:
If the scanned image appears slanted, turn the adjust pin using a
screwdriver to correct the angle of the document.
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Scanner Basics