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  1. To fix printhead problems on HP OfficeJet 6978, you can try the following12:
    • From the Home screen on the printer display, tap the Settings icon.
    • Select Printer Maintenance.
    • Select Clean Printhead.
    • Follow the on-screen prompts to start the cleaning cycle. The printer will print a test page when complete.
    • If the error shows up after installing a cartridge, try replacing that cartridge.
    • If the issue still exists, call HP Tech support for further assistance as it could be a faulty printhead.
    Learn more:

    On the HP OfficeJet 6978, follow these steps:

    • From the Home screen on the printer display, tap the Settings icon.
    • Select Printer Maintenance.
    • Select Clean Printhead.

    How do I fix the printhead problem on m…

    www.colorwithleo.com/how-do-i-fix-the-printhead-p…

    Install one cartridge at a time, close the cartridge access door and check if "Printhead problem/error" is displayed. If the erorr shows up afater installing a cartridge, then try replacing that cartridge. If issue still exists, its time to call HP Tech support for further assistance as it could be a faulty printhead.

    OfficeJet Pro 6978 printhead problem - H…

    h30434.www3.hp.com/t5/Printing-Errors-or-Lights-…
     
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  3. HP Support Community
    https://h30434.www3.hp.com › ... › td-p

    OfficeJet Pro 6978 Printhead Problem - HP Support Community

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  4. HP Support Community
    https://h30434.www3.hp.com › ... › td-p

    OfficeJet 6978 - Replacable Printhead? - HP Support Community