Your HP PSC2350 all-in-one has three (3) features, print, scan and copy,
not Fax. A scanned document must saved as a DBX document and then
send to the Fax printer. If you go to the Control Panel>Printer and
Faxes it should be listed as "Capture Fax", if you installed the printer
properly. Read the owners manual that came with the printer it gives
step-by-step instructions on how to Fax.