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

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Won't print in black

I have the very same problem that is described on this page: Before I changed the black ink cartridge, it showed to be half full. I changed the black ink cartridge because your solution (link above) said to. The problem is still there. Nothing is different. The screen still shows the cartridge to be half full. I am using Canon ink cartridges. FYI, if I am printing grey letters, they print. But if I change them to black, it produces a clean unprinted page. Thanks for your help.

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Re: won't print in black

Open your list of printers. r/click on the 780 and open properties. fo to the last tab "maintenance" and run cleaning 2 or 3 times then run deep cleaning 2 or 3 times. and see how this helps. If you've never done it before you might want to take out the print head and clean it with alcohol. Take out all the ink like you were changing them then reach in and gently pull out the container that holds the ink. This is the print head. Clean it and replace it, then run clean and deep clean again. run Nozzle check to see how clean it's become and you'll definetly see a difference in your printing. good luck

Posted on Oct 02, 2007

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Cannon Pixma MP780 won't print. Just replaced black ink cartridge, do I have to replace all of them for it to print

Not normally but the black print head nozzles maybe blocked.
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If the print head cleaning maintenance routine does not clear the blockages, then print head needs replacing, but it may be expensive.
It may be more cost effective to buy a later model and better printer than replace the print head.

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You will need to realign the alignment, and print an alignment page. Or reset printer.

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

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This will be because your black pigment (the large cartridge) will have clogged in the printhead.

Cleaning it can take a while and I've already posted a solution for this, for an MP780 so I'd take a look at that and see if it helps you solve your problem.

Oh and the reason your web pages print ok? It's because the printer is using a combination of the other inks to create black, not printing black directly... PDF's and document printouts are different as they DO use the pigment black...

Hope that helps.


Oct 01, 2009 | Canon PIXMA MP600 all-In-One InkJet...

1 Answer

OS X - Canon PIXMA MP780 printer won't print black

Unfortunately, I can't link you directly to canon's support pages, but if you go to this link, and enter won't print black and search, you'll get a list of possible solutions to troubleshoot this error. I'd start by checking your cartridge for ink,reseating it, print a test page, recalibrate the print head, etc. But that will get you started, at least.
If you have further problems please reply to this post and we'll help you get it sorted out...

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!

May 02, 2009 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

MP780 prints will not print black in photos, black text works fine

thats your service manual
i clean mine by boiling it in rubbing alcohol or submerging it in alcohol then blowing it out

Nov 13, 2007 | Canon PIXMA MP780 All-In-One InkJet...

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