An x denotes any number within a given model series.
The video below demonstrates:
Path: Settings > Device Solutions > Solutions eSF > SNF 4.1.21 > Scan Desination (Edit) > Scan Settings > Format – PDF Compression (PDF)
Path: Scan to Network Icon > Select destination (Profile Name) > Verify the summary statement indicating 'Compressed' > Send as "PDF" (checkmarked) > Send It.
Please note that you will need QuickTime to view the video. You can download QuickTime here.
The file is approximately 1.5MB; please allow time for the movie to load.