Is the HP OfficeJet Pro 8600, 8610, 8620 Printhead Really Missing or Damaged?

In this video I'll just talk about an experiment that I've done today involving the HP 8600, 8610 and 8620 printheads. Pretty often these printers gave me the error "printhead missing or damaged" and even after cleaning the contacts and doing some initial diagnoses I couldn't get them to work again. Today maybe I found something that could be a common problem, but I'd need to do more tests to say this.
All I can say for now is this: If your printer gives you that error, and you don't fix the problem cleaning the contacts or something like that, the printhead is REALLY damaged and needs to be replaced, don't even bother doing what I did :)

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How to contact me:
If you need help fixing your printer, leave a comment under the video you're watching. I always reply to the comments whenever I have some time.
For commercial requests, send me an email to the address you can find in the "about" section of my YouTube Channel. Please consider that any email received for any reason other than commercial requests will probably be ignored. I don't have a service center and I don't do repairs for other people, I just make YouTube videos on how to fix printers :)