Hp Photosmart 6520 Remove Printhead. 1 if you want to print from a mobile device, you need to have a print application on your mobile device. Remove each ink cartridge and clean the contacts with a cloth.
Leave the scanner lid open, or put a note near the printer. If this is not a viable option and the alternative is to toss the printer you might take a look at the various youtube videos related to this issue. Press down on each cartridge until it clicks into place.