Manually Clean a HP Printhead 

Manually Clean a HP Printhead
Manual cleaning of HP printer heads. This video shows how to remove and clean the heads of an HP PhotoSmart 6510 printer manually, with water and alcohol.
Disassemble the HP printer, remove the printheads, and reassemble it properly.
This same head is used by the HP PhotoSmart 6510, 6520, 6500 printers ...
The only thing that varies is the type of screws used.
The way to clean the heads once removed from the printer is practically the same for any printer model, such as the OfficeJet series (5740, 6950, 6950, 4656, 4600) the Deskjet series (2130, 2132 and 2134, DeskJet Ink Advantage 2135 , 2136 and 2138, 3500) Photosmart, .. and even from other brands such as Canon, Brother, Xerox, Lexmark, Ricoh, ...
On some occasion the print head is completely clogged and it is impossible to clean, so you must inevitably replace it.
The original heads are very expensive, but we recommend buying heads that are compatible with your printer.
On aliexpress:
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You will find 100% functional compatible heads for the HP PhotoSmart 6510. Look for your printer in the search engine and you will find them up to 6 times cheaper.