Brother MFC-9120CN - Manual (Page 80)

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 Settings tab
Choose the E-mail Application, File Type, Resolution, Scan Type, Document Size, Brightness and
Contrast settings.
Scan to File
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 General tab
To create the button name, enter a name in the Please enter a name for the Custom Button text field
(up to 30 characters).
Choose the type of scan from the Scan Action field.