I have also seen cases where leaving the printer overnight after the cleaning cycles allows black to recover. It may also help to manually clean the printhead as described in the post here. Before replacing the cartridge in the printer dribble a few (maybe four) drops of hot water into the ink port in the printer and two drops into the ink port on the cartridge then snap the cartridge back in position. This can help you avoid touching the printhead and damaging the contacts on either the ink cartridges or the printhead itself. If youre having trouble with your HP 564-compatible printer and the fixes youve tried so far arent working, you might need to replace the printhead in your printer. You can usually do this from either your computer or your printer on newer models. HP Photosmart Printheads for Clean and Clear Inkjet Printing. You can access many HP All-in-One functions directly from the control panel, without turning on your computer. If the plastic nubs protrude they can prevent the cartridge from seating properly. Before you start the process of cleaning, you’ll need to perform a nozzle check to make sure it’s actually causing the issues. You can even print a task checklist to keep track of your list of things to do. Make sure these are flush with the cartridge body, if not carefully trim them flush. There are four orange plastic spots, left over from the protective cap. Buy Compatible Ink Cartridge Replacement For Hp 02 Ink Cartridge To Compatible With Photosmart 8250 C6180 C6280 C7200 C7250 C7280 C8180 D7360 D7460 Printers (6-Pack) with fast shipping and top-rated customer service.
Turn it over and examine the area around the ink port. If the standard troubleshooting did not resolve black not printing I would suggest removing the black cartridge.
Doing so can result in incorrectly seated cartridges and printing issues.
caution: Do not lift the latch next to the carriage to install the cartridges. Press down on the cartridge until it clicks firmly into place. The troubleshooting steps in the document here may help resolve black not printing on your Photosmart 6520. With the cartridge contacts facing the printhead, slide the cartridge into the empty slot.