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

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Colors stop printing

I have an MP 780, that started not printing magenta. I tried a new cartridge, and eventually replaced the print head. It worked for a few days, then did the same thing. I complained to the company that sold me the new print head, so they gave me a different one. Again it printed fine for a day or two, and now it doesn't want to print cyan.

If I deep clean a few times, it starts to come back. I really like the printer, I hate to buy a new one (esp. after purchasing a new print head for it!) It is a few years old however. Any ideas?

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  • thedousman Oct 31, 2008

    Thanks for the 2 solutions, sorry I am just now responding. I didn't realize anyone answered me -new to this forum!



    A couple of things I have discovered. Up until now I have been cleaning the cartridges off of the front panel. I noticed that if I go to properties (within the printer software via the control panel), there is a "deep cleaning" option. If I do this, the colors are 100%. But it doesn't last too long.



    This may be a dumb observation but...I'm wondering if the fact that have been refilling the same cartridges with ink since new, has anything to do with this? The cartridges are Canon, but the ink isn't. There's really nothing to wear out in the cartridges, but maybe they clog somehow?



    Thanks!

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Hi !
Sorry for the late reply but it seems as if its eighter the cartridges or the print head, seeing as you purchased a new print head , Are you using compatible Ink Cartridriges ?

I would suggest replacing the inks and cleaning the print head manually !!!!!!!

1.) remove the head
2.) soak some alcohol or menthylated spirit through it until it runs out clean

let dry and replace.. I personally believe the cartridges you are using are good!! the ink is too thick and fouls up the jets in the inkwell..

Posted on Oct 25, 2008

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It could be down to the cartidges, if they are non canon orginal this could cause the fault, if they are canon cartridges it could be down to the purge unit no working corretly,

i know you have spent money already but it might be wise to spend 130 english pound with a years warrenty from canon and buy a new machine.

I hope this helps

Posted on Oct 23, 2008

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