How do I perform a printhead alignment on the HP Smart Tank 510?
During printhead alignment, the Number Counter icon shows the letter A or a blinking A on the control panel display. Once the alignment page is printed, place the printed page print-side down on the scanner glass, and then press one of the copy buttons on the control panel to scan the page. Printhead alignment is complete after the scan, and the A disappears. (Page 10)
From the official HP Smart Tank 510 Wireless All-in-One manual, page 10
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