HP ENVY 4520: check print quality and clean cartridges

Print the quality report, then choose cleaning for missing ink or alignment for displaced lines.

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Use the printer’s Tools menu

Load unused plain white A4 or Letter paper. Check the paper-type setting and that neither cartridge is empty.
On the printer display, open Tools → Print Quality Report. Inspect the black and colour boxes.
For missing or streaked ink, use Tools → Clean Cartridges and follow the screen. Compare a fresh report after cleaning.
For displaced alignment lines, use Tools → Align Printer and follow the display to complete the adjustment.

Technical references