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

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Magenta blocked on canon mp780

If the magenta is blocked, how do you fix that. Should I just put in another cartridge?

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  • dmdavis5 Nov 30, 2008

    Magenta is blocked. Does not print red. Also, from deep cleaning I get the message Waste Ink Nearly Full. Now what?



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Take out the cartrige and wipe the printhead down with a damp cloth and the color should bleed onto the cloth

Posted on Jul 29, 2009

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When installing the cartridges, it is important that you insert them from left to right with the black cartridge first and the magenta cartridge last. The reason for this is because the magenta cartridge has a clip on top of it that goes into the cartridge door sensor. The clip needs to push the sensor in so the printer is able to function with the cartridge door open. If you insert the magenta cartridge first, the printer will think the cartridge door is closed and you will get a error message for the other missing cartridges.

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It is due to spilled magenta toner leaking from side to the toner cartridge. Take the cartridge out of the printer and clean it. Clean visible inside of the printer. Shake the cartridge lightly in horizontal position to evenly distribute the toner inside the cartridge and put it back. The issue sould be fixed after some prints.

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Appreciate generously, if the solution could have been of any help!
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"wrong cartridge"- Printer is giving us a "wrong


Hi Sherri

I am having the same problem with my MP780 mine started doing the same thingafter deciding to use Calidad inks the large black ink leaked into the yellowink (stick to canon inks).

What I have done so far with no success -
Replaced the ink cartridges with new ones supplied by Calidad, still the sameproblem.
Removed and cleaned the print heads manually and to my surprize after soakingin warm water and multiple cleanings for over 1hr black ink is still coming outof the yellow ink head.
I still get the same message after all I have tried...

One thing I did manage to do is prime the yellow ink and got it flowing throughthe head again but it's still mixed with black... I wonder if you may have runout of magenta and dried the head...

Try priming the magenta ink by removing the head (don't touch or wet the metalcontacts at the rear, the ink heads are on the bottom) place on a clean lintfree cloth (or I just used damp tissues then dry tissues) you should get onelong black strip and two cyan, two magenta and two yellow strips on the tissue,if you do not then try priming by replacing the magenta cartridge and gentlypumping the cartridge up and down repeat until you get the ink flowing.

Replace the head and cartridges, press ok, turn the printer off then reset.

Let me know if it works or if you come up with another solution that works as Iam still trying to figure out how to fix mine.

Good luck

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1 Answer

My printer is not printing magenta. I have changed the cartridge (hp one), cleaned the print heads and


The magenta print head may be blocked. Try several deep cleaning of the print head to see if it can clear the blocked magenta print nozzles. Also check the magenta cartridge, make sure it is not empty.
If none of this works then the print head needs to be replaced.
NOTE the print head is not a cheap item, you may consider putting the money towards a new and better printer.

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Canon Pixma MP780. Recently my color ink


Have you checked to see if the jet area on the bottom of the ink cartridge has a blackish sludge on them? It might be that the area that the print cartridges are purged/cleaned to one side of the printer (sometimes called a service station, or spitoon) has built up excess ink that has gotten thick and high enough that as the carriage goes over that area the bottom of the cartridge gets polluted with the blackish sludge. It will work slightly into the jets where the ink comes out and cause discoloration, even after you change the color cartridge. Open the unit to look inside with a flashlight for build ups and clean it (if you find some) with disposable things like cotton swabs, coffee stirrers, whatever you have that wont damage anything inside. Another cause could be mixing of the cyan and magenta and yellow somehow inside making a dark color representing black - but replacing the cartridge would cure it immediately.

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The cartridge is only a tank that holds ink. The printhead is the device that you put it into and probably has a blockage in the magenta head. Open the machine so the carriage moves to the center. remove all the cartridges.
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If you've already changed out the toner cartridge and the problem persists, then it could be several other parts that are either defective, dirty or blocked.

You may want to contact a certified Xerox technician and have them look at the Imaging Unit Agitator Bar and the Low Toner Sensors for Cyan/Magenta. There could also be a faulty toner supply motor.

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yes it is not original you buy a new original one then show ink position

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