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

1 Answer

Canon MP780 has gone crazy!

It makes copies on its own without hitting buttons. It won't fax.
Seems to have a mind of its own. Worked fine until yesterday. I tried unplugging it overnight but same problem exists today.

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has answered 1,000 questions.

  • Master
  • 1,601 Answers

Issue: Unable to send faxes
Solution: Press ON/OFF switch to reset the multifunction device

Reset the device when it is not functioning properly.
If the device is not functioning properly or to clear memory, reset it.

  1. On the operator panel, press and hold the <ON/OFF> button for one second. (The display will go blank.)

  2. Wait approximately ten seconds and then press the <ON/OFF> button again.

  3. Wait until the device has completed its cycling process before submitting another job request.

were the copies from the computer or something you tried to copy before?

Posted on Nov 12, 2007


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

Canon eos 600d, takes a picture on turning on and freezes. When I turn off and on again, it takes a picture again and freezes. Cannot access menu or any other button. how do I resolve this issue?

Camera electronics has developed a mind of its won and has gone crazy. You need to have it fixed or replaced whichever is cheaper.

Make sure the battery is good since many newer electronics operate erratically when the battery condition is not up to par.

Jun 13, 2016 | Canon EOS 600D Rebel T3i Digital Camera

1 Answer

My canon pixma mp780 is not responding. I unplugged the cable and replugged in, turned off the computer and it still is not reponding.

Make sure that your computer still sees the printer. Go to printers & faxes and check. If it is gone reinstall software.

Sep 18, 2010 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

Printer is not working

It is possible that the FAX in the memory is causing the problem. Try unplugging the printer from the wall and leave it off for a minute or two to see if it will clear the memory

Dec 14, 2009 | Canon PIXMA MP780 All-In-One InkJet...

2 Answers

Canon mp780 is stuck on fine mode and it will not

yes, first change the paper setting button to normal, then you can lower the image quality on copies.

Nov 10, 2009 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

My incoming faxes won't print. both black ink cartridges r full

Is there any message when you try to print the faxes?

If there is an "Image Quality" message, probably the printer is set up to "Copy" in "Photo" or "Fine" mode and it needs to be set to something other than "Fine" or "Photo"

Apr 01, 2009 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

MP780 copy mode/resolution

Mine was stuck on fine photo resolution too and it wouldn't print in normal black. I tried lots of things and the only thing that seemed to work was pushing the photo button and then pushing the copy button again. Good luck.

Dec 13, 2008 | Canon PIXMA MP780 All-In-One InkJet...

3 Answers

Printer prints top 1" of page, then just spits out blank pages

If the printer works ok on another PC, it seems quite clear that the problem is definately software (Driver) related. If you haven't done so already, I recommend adding the printer through the Printer\Faxes Add Printer Wizard and pointing it to take the drivers off the install CD (if you have one) rather than installing the printer from the CD Autorun. Just make sure that you've deleted the printer completely from Printers\Faxes and rebooted before each install attempt.

I hope this helps!


Matt Coyote

Feb 24, 2008 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

Fax Not working

Copying Documents If you make copies of multiple documents at a time, the number of pages the fax can scan into memory varies depending on the scanning resolutions as follows: * STANDARD and FINE result in the same resolution when making copies
* If MEMORY FULL appears on the LCD when making copies, reduce the number of documents to be copied or reduce the amount of total copies.
  1. Lift up the document tray.

  2. Insert the top of the document, face up, into the ADF (1) until a beep is heard.
  3. Adjust the document guide to the width of the document.

  4. Press <Resolution> to select the resolution.
    You can select [STANDARD], [FINE] or [PHOTO].
  5. Press <Start/Copy>.
  6. Enter the number of copies (up to 99) using the numeric buttons.
    To make a correction to the number of copies, press <Clear> and re-enter the number.
  7. Press <Start/Copy>.
    To stop copying anytime, press <Stop>. If the document does not eject, press <Start/Copy> for a few seconds, then the fax will feed out the document.
  8. The new resolution will remain until it is changed.

Nov 05, 2007 | Canon FaxPhone B95 Plain Paper Inkjet

1 Answer

Canon Pixma MP780 Fax Problem (horizontal line)

Solution is here:

Mar 05, 2007 | Canon PIXMA MP780 All-In-One InkJet...

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

162 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

2058 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