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4.On the File menu, click Acquire, or click Twain and then Acquire. The WorkCentre 400c Series Scanner Setup dialog box displays.
5. Choose from the following options:
Paper Size
Specifies the document size you are scanning: letter, legal, and A4.
Resolution
Sets the scan resolution. Options are fine (200 x 200 dpi) and superfine (300 x 300 dpi).