How do I set up fax on the Officejet Pro 7720?
You can set up fax using the HP printer software (recommended) or from the printer control panel. For Windows, use the Fax Wizard during software installation. For OS X and macOS, use Basic Fax Settings from the HP Utility after software installation. From the control panel, touch Fax on the Home screen, then touch Setup. (Page 2)
From the official HP Officejet Pro 7720 Wide Format All-in-One Printer manual, page 2
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