How do I complete the printer alignment after installing the cartridges?

After closing the cartridge door, wait 30 seconds for the alignment page to automatically print. Open the lid, place the alignment page face down, close the lid, and press the Start Copy Color button. Wait until the On button light stops blinking, which indicates the alignment has been completed. Completing the alignment ensures better print quality. (Page 2)

From the official HP Deskjet 2050 All-in-One Printer Series J510 manual, page 2

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