How do I set up the fax on my HP Officejet 4650?
Connect the phone line to the port labeled 1-LINE on the back of the printer. Then from the Home screen on the control panel display, touch Fax, touch Setup, touch Setup Wizard, and follow the on-screen instructions to test the fax setup. The test checks hardware, verifies phone cord type and connection status, and checks for a dial tone and active phone line. If your country is listed on page 6, visit www.hp.com/uk/faxconfig for setup information.
From the official HP Officejet 4650 All-in-One Printer manual, page 6
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