HP Officejet 8720 scan function can't find printer after W10 upgrade

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  1. Posts : 99
    W10 pro 22H2

    HP Officejet 8720 scan function can't find printer after W10 upgrade

    After I did the W10 install the printer worked, and I thought I was all ok until I tried to scan today.

    The printer is connected via USB.

    Print and Scan Doctor said it couldn't find the printer. When I press the scan button on the printer it says it can't find the computer.

    I can't get the information I need from HP. The printer is out of warranty and the virtual agent doesn't understand my question.

    I was impressed that the USB connection for the printing function migrated seamlessly to w10, because it was very hard to set up initially n W7. But I need to scan too!

    As usual, I would appreciate your help
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  2. Posts : 819

    I don't have the printer to help you, but --

    1. I find my PC forgets that the printer is connected. I used to pull my hair out rebooting but really one unplug and replug fixes it every time. And it didn't start that way with Windows 10 but developed about a year ago.

    2. I'd be all over an HP forum to see if this is a common issue with a suggested fix. Is there nothing there? Have you already been here --

      My Computer

  3. Posts : 29,977
    Windows 11 Pro x64 Version 22H2

    Go to HP and within support section find your printer. For ease of reference


    Download the HP Easy Start Printer Setup

    On you PC uninstall the printer.

    Disconnect printer (remove USB Cable)

    Then in the Apps ( part of Settings) uninstall everything HP related to this printer.

    To do this click Start, then the Settings icon (gear) then Apps heading. Find software, click once and then click on uninstall.

    With everything removed and printer still disconnect restart computer.

    Once computer is back start the install. When it says to connect the printer or that it can't find printer connect USB cable with printer powered on. Proceed through install.

    At the end you should have a printer and a scanner.
      My Computer

  4. Posts : 99
    W10 pro 22H2
    Thread Starter

    Pool Man, thanks for the prod to check the HP forum. When I did that to try to set up the printer initially I got a lot of advice that did not work, but maybe they will come through for me this time. I posted my query there too.

    I don't see the scan dialog box, just the message that the scanner cannot be found and the option to click ok.

    Caledon Ken, you posted while I was reading Pool Man's post, and I will follow your steps tomorrow. Thank you so much. Maybe following your instructions will even enable the fax function, which has never worked on this printer (although it did on the previous HP printer, connected to the same computer, on the same phone jack). When I plug in the fax cable (the one supplied by HP) our whole phone system is disabled. We have a copper line.
      My Computer

  5. Posts : 29,977
    Windows 11 Pro x64 Version 22H2

    This won't fix FAX line taking whole house down.

    There are two ports for the telephone line on most units. Sounds like you might be in the wrong one.

    You do not want the one with the little phone embossed near it. That is for a telephone to be connected.

    You want line in.
      My Computer

  6. Posts : 99
    W10 pro 22H2
    Thread Starter

    Caledon Ken, good thought, but I just checked and I think it is plugged in right. There are indeed 2 phone jacks on back. I had left the fax cord plugged in to the computer, on the one labeled 1-LINE. The other one is labeled 2-EXT, and came with a dummy blocker plug. I checked the printer manual, and indeed the fax is supposed to be plugged into 1-LINE.
      My Computer

  7. Posts : 2,585
    Win 11

    FWIW I have an 8720, connected via wi-fi, working perfectly in Win10. USB should be no different.
    I installed the HP software and followed the on-screen instructions. I didn't connect the Printer first, which potentially can cause problems or wrong drivers.

    I would do what Calendon Ken suggests, with one additional step. After eveerything is uninstalled and before you start the new install, reboot (restart) the PC. Then do the new install.
      My Computers

  8. Posts : 13,766
    Win10 Version 22H2 Pro and Home, Win11 Pro and Home

    Sometimes with the software scanning feature problems I will go the Start, W section and Windows Fax and Scan to see if the TWAIN driver is working.
      My Computers

  9. Posts : 99
    W10 pro 22H2
    Thread Starter

    Caledon Ken, fireberd and Berton, Printing and scanning are working fine now. I think the steps I had forgotten were restarting the computer after deleting the old printer files and unplugging the USB before I asked to install the new ones.

    I am not up to working on the fax just now, but it will be wonderful if that works too. Berton, thanks for telling me about Windows fax and scan and the Twain drivers. I'm still not used to having a comprehensive control panel that gathers all of the possible places to look.
    Last edited by Judy in Texas; 16 Jan 2020 at 12:34. Reason: correct error
      My Computer

  10. Posts : 13,766
    Win10 Version 22H2 Pro and Home, Win11 Pro and Home

    You're welcome.
      My Computers


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