Samsung SCX-5639FR-XAA - Manual (Page 285)

Scan features
125 4. Special features
47
Linux scanning
Scanning
1 Make sure that the machine is connected to your computer
and powered on.
2 Double-click the Unified Driver Configurator on your
desktop.
3 Click the button to switch to Scanners Configuration.
4 Select the scanner on the list.
5 Click Properties.
6 Place a single document face down on the document glass, or
load the documents face up into the ADF.
7 From the Scanner Properties window, click Preview.