Question about Canon PIXMA MP780 All-In-One InkJet Printer

1 Answer

Canon MP780 wont scan

Printer wont scan from computer every thing else is fine but when i try to scan a message comes up saying cannot communicate with scanner

Posted by ned666 on

  • 14 more comments 
  • Anonymous Nov 08, 2007

    same problem

  • tomes
    tomes Dec 08, 2007

    I've got the Canon Pixma MP210, and have the exact same problem. Exact error: "Cannot communicate with scanner. Cable may be disconnected or scanner may be turned off. Check state. Scanner driver will be closed." Printing works so obviously it's not a cable problem. ;-)

  • ned666 Dec 13, 2007

    Hi ned666 here i ended up removing drivers from computer and reinstalling them and all is fine now thanks.

  • louis89 Mar 03, 2008

     I recently bought a new Macbook and transfered all my stuff from my old ibook to the new mac. I have a canon pixma multifunction printer, and I am experiencing problems with my scanner, though the printer seems to work fine. I get the error "failed to open a driver". I have tried downloading a new driver, uninstalling the old one etc..still not luck! any suggestions? thanks

  • FGE2 Mar 21, 2008

    Yes I do....

  • FGE2 Mar 21, 2008

    MP Navigator PX appears to prevent my ability to search other pdf docments if I am reading this correctly - am I right?

  • madison j May 13, 2008

    My MP780 scanned one photo and then said couldn't find driver when I tried to scan a second. I turned the  printer of and on tried again and it worked. This happened three times -- scanner would scan one time then the can't find driver message would appear then turning off and on the printer would fix the situation for one scan. After 3 times, the can't find driver message appears all the time now. I've uninstalled and reinstalled the software several times but it still will not scan.

  • iandebjak Jul 13, 2008

    Having the same problem -- won't scan, can't communicate with the printer. I have downloaded new drivers and installed them, switched the printer off and on again, but still no luck. Am operating through Time Capsule, but all other functions are ok.

  • Anonymous Aug 16, 2008

    I have a MO 780 and it is more than 3 y old. First installed in mac and never a problem. Installed in new laptop (windows vista) everything works just fine but scan. No desktop icon and can't find facility.

    Anyone help,


  • Anonymous Mar 24, 2009

    i can't find the program to scan off of my printer

  • Skye May 11, 2010

    I have the same issue with my MP210, now. I'm using the scanning stuff that came with it. I uninstalled and reinstalled, and now it's just sitting there, saying "Scanning...", but nothing is happening.

  • Anonymous Mar 20, 2014

    Hi my canon pixma MX420 isn't scanning. I press all the riht buttons and it says its in progress and then stops and that's it. It wont come up on my computer screen and I cant find it anywhere in my computer. It is a new windows computer and the printer is all set up to the computer. Everything else works except the scanner.

  • Anonymous Mar 21, 2014

    keeps coming up with all these erros, won't scan

  • Anonymous Mar 21, 2014


  • Anonymous Mar 21, 2014

    Trying to scan and save to computer, but message on screen says Missing PC. Also will not print from PC. I have done troubleshooting and checked USB all fine?

  • Anonymous Mar 25, 2014

    scanner wont work on MS vista



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  • 1,113 Answers

Download and reinstall scanner software and scan driver

Posted on Nov 01, 2007

  • Soulvisitor
    Soulvisitor Dec 13, 2007

    Good to hear your running Ned666, Thanks for trying rating.

    Tomes and guest did you try what ned666 did to fix his?

  • Soulvisitor
    Soulvisitor Dec 13, 2007


    When you do it please Disconnect USB, Delete old install, then install and only connect when software prompts. download and installl MP Navigator EX too

    LINK to canon drivers/software



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Here is what I did and it now works just fine.I turned off the printer and unplugged the power cord, and unplugged it from my computer. I then removed all the ink cartriges and removed the print Head I got some rubbing alcohol put it on some toilet paper and wiped down the back and bottom of the print head.Plugged everything back in and It now works better then ever.

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