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 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



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Canon Master
  • 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



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My canon mp780 won't turn on

Make certain you have the current updated drivers for the printer. Check to see if the printer is recognized as one of the devices active and available. If its wireless, be certain the communication is both ways. Do a printer test of the Wireless transmission phase. If you connect directly by Cat5/6 cable with Ethernet, check drivers. Check cables. Check for a positive connection on both ports, Computer and Printer. Make certain the printer listed is the Main Printer when you do a setup.

Feb 08, 2018 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

My PIXMA MP780 always says "Warming Up" when I try to fax or scan. It never warms up. The machine prints fine- doesn't do much else.

Paper feed roller
When paper does not feed properly.
To clean the paper feed rollers.
Machine buttons
2 min.

Oct 12, 2009 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

Canon Pixma MP780 printer wont turn on

Dear sir,
This problem printer power supply or power adoptar is out of order or fuse is burning
please chack it and solve this problem

Aug 27, 2009 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

When i scan on my Canon Pixma MP780 printer i get a red line down

This is what the service manual says:
(1) Clean the Document glass.
(2) Check the connection
between the contact sensor
and SPCNT board (JCCD1).
(3) Replace the SCANNER
(4) Replace the SPCNT board

Jun 11, 2009 | Canon PIXMA MP780 All-In-One InkJet...

4 Answers

When Trying To Scan, ScanGear Message Comes Up Saying Cannot Comminate With Printer.

Make sure the "Still Image Service" is running on your system. Right-click "My Computer", select "Manage", then open "Services" applet. Scroll down to the "Still Image Service", right-click it and set its properties to "Automatic", then right-click it and "Start" it.

Nov 08, 2008 | Canon PIXMA MX310 All-In-One Printer

2 Answers

USB malfunctioned message

1)right click the my computer icon
2)click properties and then click hardware n go to device manager.
3)uninstall all usb ports and then scan for hardware changes
4)ur pc will detect your printer and ask for printer drivers
5)re load drivers and your pc will communicate with your printer
6)for reloding install the cd follow the instructions on the screen and click next
7)restart when the printer is loded.connect the wires and cords properly

Nov 06, 2008 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

Computer can't find scanner

please try by reinstalling the scanner driver.plz post your findings

Apr 09, 2008 | Canon PIXMA MP780 All-In-One InkJet...

5 Answers


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.

Feb 08, 2008 | Canon PIXMA MP780 All-In-One InkJet...

Not finding what you are looking for?
Canon PIXMA MP780 All-In-One InkJet Printer Logo

Related Topics:

3,482 people viewed this question

Ask a Question

Usually answered in minutes!

Top Canon Office Equipment & Supplies Experts


Level 3 Expert

102366 Answers

old marine
old marine

Level 3 Expert

2061 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Are you a Canon Office Equipment and Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides