How can I set up fax on my printer?
You can set up fax using the HP printer software (recommended) or from the printer control panel. For Windows users, use the Fax Wizard during software installation. For OS X, use Basic Fax Settings from the HP Utility after installation. Alternatively, touch Fax on the Home screen and then touch Setup on the control panel.
From the official HP Officejet Pro 7740 Wide Format All-in-One Printer manual, page 2
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