HP Deskjet 3820 Color Inkjet Printer - Manual (Page 77)

check the printer properties
Follow the basic printing instructions and verify the following options:
tab setting
Setup
Print Quality: Best
Paper Type: An hp photo paper
Paper Size: Appropriate paper size
blank pages print or color is missing from printout
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The protective piece of plastic tape may still be attached to the print cartridges.
Verify that the plastic tape has been removed from the print cartridges.
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The print cartridges may be out of ink. Replace one or both empty print
cartridges.