Load an original document properly into the ADF tray or on the scanner glass.
Can you send faxes?
The problem is solved.
Go to step 2.
Set up the shortcut number properly.
Contact customer support.
If you experience failure in getting incoming faxes, then make sure that the trays and the toner cartridge are not empty.
Are your fax messages not going through? Make sure that your printer is connected to a working analog telephone service.