Brother MFC-3420C - Manual (Page 104)

4 - 28 USING THE WINDOWS ® XP-BASED BROTHER SMARTUI CONTROL CENTER
FAX settings
Brother PC-FAX
To change the driver settings, click on the Setup button. Select the
Paper Size, Paper Source.
If you need more customized setup, click on the Options button.
Select the Paper Size, Orientation (Portrait or Landscape) and
Resolution (200x200 dpi or 200x100 dpi), and click OK.
To return to the factory default settings, click the Default button.