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

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Pixma MP780: All of a sudden there are white stripes in the cyan, magenta and yellow nozzle check print out...PLUS all the "6 C" etc listings on the left margin are striped as well...the "3eBK" is FINE

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Try dis-connecting all cables from printer, then re-connect them all back.

Posted on Feb 06, 2010

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If deep cleansing via software doesn't work then you've got to manually clean your print head unit. Sometimes you'll have to bite the bullet and get a replacement print-head unit ($$). If you're at the stage that you're considering replacement, then you've got nothing to lose by cleaning the print-head unit yourself. It's simple. Remove all ink cartridges first then remove the print head itself. Place the print head unit in a saucepan of warm (NOT boiling hot) water and leave to soak for an hour. (Protect your clothes - it gets messy) After an hour, flush the printhead unit under a running tap. Don't run the water too fast or you may damage the unit) You should flush until the water runs clear. Do not attempt to clear the nozzles with anything other than water - they are very fine needle jets and you will damage them!! If needs be, return to saucepan and leave to soak in warm water again and repeat process. When you are satisfied that the printhead is clean, you need to dry the unit thoroughly. Shake as much water from it as you can then pat it gently dry. Next place it on some absorbant kitchen paper and put the unit in a warm place to thoroughly dry (Overnight in a warm airing cupboard would be good). Once dry, refit the unit put in (Preferably new - but I've used existing one's without problem) cartridges and run a cleaning cycle. Your printer should now work as if new!!! - In Most cases!! - sometimes though, you'll either have to replace the print head unit - which sometimes can be more expensive that simply replacing the printer. What have you got to lose though eh? CLIVUSS

Posted on Jan 27, 2012

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It sounds like the color nozzles are not cleaning properly, If you do at least 2 deep cleans and the print doesn't improve, you may need a new printhead. The cables won't cause this type of problem.

Posted on Feb 08, 2010

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1 Answer

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Worn print head. And for what they charge for a stinking print head you can get a new printer for less with a warranty to boot!

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Inkjet printers do not like being left unused for long periods.
Some of the color print head may be blocked. Try several deep cleaning of the print head to see if it can clear the blocked print nozzles.
If none of this works then the print head needs to be replaced.
A new cartridge will not solve this problem.
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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There are magenta horizontal stripes going across all color prints. I have done nozzle checks and cleaning but still the 6M and 6C are not solid colors as they should be.


try checking for dirty contacts where the ink cartridge connects to printer (where it sits, the gold pins or somethin).

If changning cartridges dont work it probably your carriage ribbon

Aug 08, 2009 | Canon PIXMA MP780 All-In-One InkJet...

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I recently installed new black ink cartridge. Since doing so, the colors on anything printed are incorrect. For instance, anything red prints as pink. Anything deep yellow prints as a gold. MY...


Hi maryryherd - yes the C64 is in the list - don't know why you couldn't see it.

The inkjet colour system can be quite confusing. The colours in the cartridges are cyan, magenta and yellow, plus black. Other colours require a mixture of these basic ones. For example, to produce "red" requires a mixture of magenta and yellow. Your problem sounds like you are getting insufficient yellow, and maybe insufficient black.

Have you tried a cleaning cycle? If not, try one (right click the little printer icon in the bottom right corner of the screen and select head clean). Now run a nozzle check (right click the little printer icon in the bottom right corner of the screen and select nozzle check). Are all the 3 colour bands plus black printed OK. If not, try up to three cleaning cycles. If ink is now flowing pretty well, but not yet perfectly, don't carry out any more cleaning cycles. Just leave the printer for 24 hours (to allow any air in the print head to disperse). Then repeat the cleaning cycle/wait process. It may take a while to restore a perfect nozzle check print. If these actions produce no positive results, report back with a new comment.

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1 Answer

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.

Jan 04, 2009 | Canon PIXMA iP4300 InkJet Photo Printer

1 Answer

Prints all yellow, with some blue and black, no brown


the problem is very simple the magenta ink the cartridge is over or the head is been blocked from where the magenta ink comes out,
because red colour requires ---yellow plus magenta(pink)----to make it red.and ----dark yellow plus magenta(pink) -------- for brown colour.

Nov 22, 2008 | Canon PIXMA MP780 All-In-One InkJet...

2 Answers

Won't print red


Red is a combination of Magenta and Yellow. Print a nozzle check and observe for Magenta, Yellow and cyan. If the three colours are printed, no problem with the cartridge. Then it must be the problem of seeing colours in your monitor. .

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1 Answer

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Well, first off, are the alignment, and nozzle check sheets looking good? If not, then work on that. If so, then we have a problem. Try creating a test sheet in Word. Make red, yellow blue & black text and see if anything else prints wrong. Get back to me!

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