Canon PIXMA MP780 All-In-One InkJet Printer Logo
Posted on May 04, 2017
Answered by a Fixya Expert

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Color drop out

I'm having a problem in that certain colors are dropping out when printing, the irony being that they are not always the same one. For example, magenta wasn't printing and now after countless deep cleans, cleaning the heads and replacing cartridges that are drying out in the process, the cyan won't print.

When I print out the check pattern the color bars all look fine, including cyan but it has dropped out of the letters on the left, so one would suppose the ink can get through but for some reason won't.

Any ideas?

  • hookka Mar 07, 2008

    In my case the magenta refuses to print on the test sheets while doing the print check. I have gone thru numeraous clening sessions. Everything I print comes out with a green hue. I can not print the reds.



    Any solution will help

    Thanks

  • Anonymous Mar 08, 2008

    Actually looking at the color bar printouts on the test pattern, I see
    that though the cyan is printing it is printing a llot dimmer than it
    should be, which is presumably what is giving everything its brown
    tinge.

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1 Answer

Adam Plug

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  • Expert 197 Answers
  • Posted on May 04, 2017
Adam Plug
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Sounds like the print head itself has clogged or some inks have become harder... can happen over time especially as you dont know how long inks have been on shelf before you bought them... some brands are better than others for that...

1 Related Answer

John K

  • 12 Answers
  • Posted on Jan 21, 2009

SOURCE: iP4300 only recognizes magenta OR cyan

1. Get compressed air
2. Run Printhead under HOT water, do not worry about contacts getting slightly wet.

3. Blow compressed air with straw attachment into screens where the cartridge nozzle sits on printhead. then let it sit and dry.

4. reinstall print test page

5. if this fails open paint/photoshop and print a page of the color that is not printing correctly. rinse and repeat until colors flow freely.

I have several ip4300s and I have yet to give up the ghost on a printer with a clog ujsing this method.

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