7740 Print head appears to be missing, not detected, or incorrectly installed

[DSmith0123]

I have tried watching various you tube videos on correcting this issue. Removed the print head, cleaned off the contacts on the board at the back of the print head. Checked the springs at the back to see if they were stuck. With a syringe removed the ink from the print head, ran warm water through, put everything back together, still same printhead missing or incorrectly installed. 

Bought a new HP print head, installed it, same issue.

What else can be the issue with the print head and how do you fix it? 

[Hawks_Eye]

Hi @DSmith0123 

Welcome to the HP Support Community!

Thanks for posting your query! We're here to help you get back up and running.

It sounds like you've already gone through a lot of effort to resolve the issue with your HP OfficeJet Pro 7740, and I can understand how frustrating this must be. Since you've tried cleaning and even replacing the printhead, here are some additional steps to consider:

Step 1: Perform a Power Reset

1. Turn off the printer and unplug it from the power source.
2. Disconnect any USB or network cables.
3. Wait for at least 2-3 minutes.
4. Plug the printer directly into a wall outlet (avoid surge protectors) and turn it back on.

Step 2: Check for Firmware Updates

1. Download and install the latest firmware update. Update the firmware on an HP printer | HP® Support
2. Restart the printer after the update and check if the issue persists.

Step 3: Inspect the Printhead Assembly

1. Ensure the printhead assembly is seated correctly in the carriage.
2. Check for any obstructions or debris in the printhead slot.
3. Verify that the electrical contacts on the printer and the printhead are clean and undamaged.

Step 4: Reset the Printer

1. Access the hidden support menu:
   • Turn on the printer and press the Home button.
   • Tap the area where the Back button would be four times to access the menu.
2. Select Reset Menu and perform a Semi-Full Reset.
3. Follow the on-screen instructions to complete the reset.

Step 5: Test with Original HP Cartridges

1. Ensure you are using genuine HP ink cartridges, as third-party cartridges can sometimes cause compatibility issues.
2. Remove and reinstall the cartridges to ensure they are properly seated.

 

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Take care, and have an amazing day!

Regards, 

Hawks_Eye