Brother MFC-3420C - Manual (Page 74)

3 - 17 USING THE BROTHER CONTROL CENTER
Scanner settings
From the pull-down list, select the scanning mode that is appropriate
for the type of file: Draft Copy or Fine Copy.
To change any of the settings for this mode, click Modify Settings.
Number of copies
Copies—Enter the number of copies you want to print.
To change the copy options, click the Copy Options button.
Click OK to save your Copy settings.