HP Smart Tank 7602 Black Printhead Missing Error

[JJP9]

I recently started to get a Black Printhead missing error on my Smart Tank 7602.  I've cleaned the printhead multiple times and even bought a new one, but the error persists.  I've power-cycled the printer countless times, updated the firmware, reseated the printhead many times, and still the error will not clear.  Any additional help is greatly appreciated;.

[BeemerBiker]

To prevent bubbles from forming in the ink tubes, keep the ink levels above the minimum line, refill the tanks before they run too low, make sure the tank caps are closed securely, and avoid tilting or transporting the printer unnecessarily.

If you have bubbles

HP's SupportGPT recommends using HP Smart (or the HP App) to run HP's clean printhead function that many of our inkjet or tank printers have.

Google's AI provides a fallback in the event that maintenance cycle fails

• Turn off the printer: Power off the machine and safely open the access doors to expose the ink tanks and printhead carriage.
• Locate the air bubble: Visually identify where the air bubble is trapped in the translucent ink pipe.
• Manually push the air: You can often gently tap along the ink tubes to help the air bubble travel up into the main ink tank reservoir.
• Use a syringe (for stubborn clogs): If tapping fails, you can use an ink refilling syringe (often found in printer cleaning kits). Remove the ink cartridge or damper inside the printhead, attach the syringe to the ink outlet, and gently pull back on the plunger until ink flows smoothly and the air is drawn out.

OpenAI states what not to do

Don't squeeze the ink bottles while they're installed.
Don't try to force ink through the tubes with compressed air.
Don't use a syringe on the ink tanks unless you are experienced with HP ink systems—it's easy to damage the pressure regulation or introduce more air.

Let me know what you find out.