What does it mean when there is a blinking 'A' on the control panel during initial printer setup?
The blinking 'A' on the control panel during initial setup indicates that the alignment page is printing and waiting to be scanned. Place the printed alignment page print side down on the scanner glass, then press the Start Copy Color button on the control panel to align the printheads. (Page 21)
From the official HP Deskjet GT 5820 All-in-One Printer manual, page 21
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