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

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Power is on to my Canon Pixma MP780, but no display

Power is on to my Canon Pixma MP780, but the only thing in the disply is a line of faint gray boxes on the bottom line of the display.
No functions work on it at all.

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I got such problem on my MP 780 (grayed boxes on bottom LCD line, no function). It turned out to be missing 1.5V for CPU core. On revese (solder) side of mainboard i found point described as "1.5V". I've powered this from external supply (took about 2 amperes) for few seconds and MP is alive again (without external supply).

Posted on Jun 25, 2010

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Posted on Jan 02, 2017

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1 Answer

My Canon MP780 when trying to copy only prints out gray shade, when I try to print a color picture it appears solarized, Any ideas?


This may be your color cartridge is dry or make sure you not giving print in grayscale mode.

Hope this helps. Please rate my response.
Thanks.
Have a good day.

Dec 24, 2010 | Canon PIXMA MP780 All-In-One InkJet...

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Jul 02, 2010 | Canon PIXMA MP780 All-In-One InkJet...

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If a hard reset like your doing will not work it's time to buy another printer.

Nov 24, 2009 | Canon PIXMA MP780 All-In-One InkJet...

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You get that message when the printhead goes bad. It's not the ink cartridges. You need a new printhead
# QY6-0049-000 around $60.00

Nov 18, 2009 | Canon PIXMA MP780 All-In-One InkJet...

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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.
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***’y.

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

1 Answer

How do I remove the printhead Canon Pixma MP780


OK lift the gray lever up and remove the cartridges, look just below the gray lever and you will see two rounded protrousions inside towards the rear of the black box, grasp these protrousions with your thumbs and forfingers and gently pull toward you, ther may be some resestance but pull smoothly do not ****, the print head will come out.  There are no wires to disconnect the circuits are touch circuits.

Dec 26, 2008 | Canon PIXMA MP780 All-In-One InkJet...

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Software for canon pixma mp780


Not knowing where you are from, I can only give the following help.

Do a Google search using the following text:

pixma mp780 +driver

Note the "+driver" (no space between the "+" and the word "driver").

This will bring up a lot of sites where you can dowload the drivers.

Apr 05, 2008 | Canon PIXMA MP780 All-In-One InkJet...

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I simply want to set the printer to print confirmations and also to know the code to print a confirmation report at days end.

Apr 04, 2008 | Canon PIXMA MP780 All-In-One InkJet...

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