How can I reset the HP Deskjet 1510 to factory default settings?
To reset the printer, press and hold the Power button for 10 seconds. The LED will flash red as it resets all settings to their original state. After resetting, you'll need to re-pair any previously connected devices (Page 23).
From the official HP Deskjet 1510 All-in-One Printer manual, page 23
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