Brother MFC-3420C - Manual (Page 42)

2 - 13 HOW TO SCAN USING WINDOWS ®
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The scanner resolution you can select is up to 1200
×
1200
dpi.
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For resolutions greater than 1200dpi, use the Brother
Scanner Utility. (See Brother Scanner Utility on page 2-18.)
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You cannot select the Paper source (A) other than
Document Feeder.