How do I set the HP Deskjet 2510 as the default printer on Windows 7?
From the Windows Start menu, click Devices and Printers, then ensure there is a check mark in the circle next to your printer. If it is not set as default, right-click the printer icon and choose Set as Default Printer from the menu.
From the official HP Deskjet Ink Advantage 2510 All-in-One Printer manual, page 3
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