HP 7740 ink cartridge not recognized, even when full

[fabio06122024]

I replaced my yellow cartridge for a cartridge that I had in another printer, that broke.  I saved the cartridge, because was like new, but when I installed, it didn't work... Why?  Can somebody enlight me, please

[Sneha_01]

Hi @fabio06122024,

Welcome to HP Support Community.

Thank you for posting your query, I will be glad to help you.

When your HP OfficeJet Pro 7740 printer does not recognize an ink cartridge, even when it's full and seemingly compatible, several factors could be at play:

Possible Causes and Solutions:

Ink Cartridge Compatibility:

• Ensure that the ink cartridge is compatible with your HP OfficeJet Pro 7740 printer model. Using cartridges from other printer models, even if they appear similar, can lead to compatibility issues.
• Check the cartridge packaging or consult the printer's manual to verify compatibility.

Cartridge Contact Issues:

• Sometimes, ink cartridge contacts may become dirty or blocked, preventing proper communication with the printer.
• Remove the cartridge and gently wipe the contacts with a lint-free cloth or cotton swab dampened with distilled water. Allow it to dry completely before reinstalling.

Cartridge Chip Issues:

• Ink cartridges for HP printers often include an electronic chip that communicates with the printer to monitor ink levels and ensure compatibility.
• If the chip is damaged or incompatible, the printer may not recognize the cartridge. Ensure the chip is clean and undamaged.

Printer Firmware Update:

• Occasionally, printer firmware updates may include improvements or fixes for cartridge recognition issues.
• Check for and install any available firmware updates for your HP OfficeJet Pro 7740 printer from the HP support website or through the printer's control panel menu.

Reset Printer:

• Sometimes, resetting the printer can resolve unrecognized cartridge issues.
• Turn off the printer, unplug it from the power source, and wait for about 1-2 minutes.
• Plug the printer back in and turn it on. Reinstall the ink cartridges and check if the issue persists.

I hope this helps.

Take care and have a good day.

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Rachel571

HP Support