HP Deskjet 3420 Color Inkjet Printer - Manual (Page 44)

calibrating print cartridges
After installing a print cartridge, calibrate the print cartridges to ensure the best print
quality.
Calibrating the print cartridges takes about two minutes and requires you to examine
two test pages.
To calibrate print cartridges:
1. Go to printer maintenance .
2. Click the calibrate printer button.
3. Click calibrate , then follow the onscreen instructions.
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