Brother MFC-9330CDW - Manual (Page 21)

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3
2-sided Scan (for MFC-9340CDW)
3
a Press 2-sided Scan.
b
Choose LongEdge, ShortEdge, or Off.
c If you do not want to change any other settings, press OK.
NOTE
2-sided Scan is available only when you scan from the ADF. The default setting of 2-sided Scan is “Off”.