Avision AVA3 400 - Manual (Page 31)

Scanner Operation
4-4
Select MrScan-Expert as the source.
3. You need to select MrScan-Expert for just once except
when you need to use the dialog box to select a different
source. In that case, you will need to select MrScan-Expert
as the source again before you can reuse the scanner.
4. Place the document upside down on the document board
with the text facing away from you.
5. From the File menu, choose Acquire.
6. Avision TWAIN user interface as Figure 4-2 will pop up on
the screen. Click Preview or Scan button to scan the
document.
Figure 4-2 PC TWAIN user interface