Canon MB5450 Series Online Manual page 699

5. Select Select Source according to the documents to be scanned.
To scan only the front side of each document, select Document (ADF/Platen) or Document (ADF
Simplex).
To scan the front side then the back side of each document, select Document (ADF Manual Duplex).
6. Set the color mode, document size, and scanning resolution as required.
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