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

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Blue color will not print on Cannon MP780.

Changed all the cartridges with new ones. I have repeatedly done nozzle checks, cleaned the heads, checked alignment, etc. Help!

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Well the first thing you do is check your settings in the printer properties

next verify that your blue(cyan) cartridge has ink

next take out the print head, soak it in menthylated spirit if rubbing alcohol for a few minutes, using a straw blow out the nozels,, next clean all the contacts that touches the cartridge..

if that dont work submerege the inkwell in boiling alcohol and that will clean out everything you might need to do a few cleening to get ink back in the well before it actually prints after

N.B. the method described above are unconvential but will work.
the reson it aint printing is cause the print head (ink well is clogged) or the contacts are dirty

ENJOY and be careful not to break anything

Posted on Dec 31, 2007

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1 Answer

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.
Inkjet printers need to be used frequently to prevent ink drying out and blocking the print head nozzles.
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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Pink and blue streaks on right side of page


most probably your "soak" pad need exchange. check your manual and change it. when you "deep clean" heaps of ink is absorbed into the pad exacerbating the problem, not solving it.

remove cartridges first and check them for existence of any foreign matter,

check for presence of debris under the head and parking place, remove if any,

i would suggest cleaning of printheads, albeit this can be risky (check first if your ink is soluble in water, isopropyl alcohol or methylated spirit, use that which solve your ink without clumping as cleaning agent), remove cartridges and allow appriopriate solvent to sit few second on metal rasters, wipe them with clean absorbing tissue and repeat procedure till solvent is "sinking" through the net.

remove old and install new absorbent pad under the print heads,

re-install inks, print rest page and then "normal" page. ink on first test page maybe very weak as solvent need to go through first.

if you follow the steps correctly, your should have clean print on the end.

"deep cleaning" is just waste of time, effort and ink. it is better if you create yourself a document with alternative lines of all three basic colours and black and then print it.

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alcohol burnout print nozzles, you have ruined your printer head. you need to replace-it.

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1 Answer

My printer is only printing the clor blue for a


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). Is there any sign of ink on the paper. Try up to three cleaning cycles. If ink is now flowing, 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 you have already done lots of head cleans with no result, are you sure you have good ink cartridges properly installed? The printer determines the amount of ink left in the cartridge by counting the number of ink "shots" when printing, head cleaning etc. This information is stored in the "chip" on the cartridge. Thus, it is not an actual measurement of the ink left, but an estimate calculated by subtracting the total shots from the original full ink quantity. This estimate can sometimes be grossly in error, usually due to a cartridge replacement not being carried out correctly. To eliminate this possibility, buy a new set of compatible cartridges on E-Bay - they're very cheap. You can always re-use the old ones later if it turns out they DO have ink in them.

If none of the above works, then you may have blocked print head nozzles. You can try soaking the print heads for 24 hours (or more), as follows. Turn the printer on, and as soon as the print head moves out of its parking position, pull the power cord out of the back, or turn the printer off at the mains. You may now carefully move the print head by hand over to the left hand side out of the way. Look inside the print head parking area on the right and you will see a small rubber cup that comes up to cover the print nozzles when the head is parked (to stop it drying out). Use a syringe or dropper to fill this cup with head cleaning fluid or distilled water. DO NOT USE TAP WATER. Carefully push the print head by hand fully into its parking position so that the cup full of fluid comes up over the print head. Do not turn the printer on at any stage in this process. Leave this for at least 24 hours, then turn the printer on and try a head clean/nozzle check again. If you get any black ink on the nozzle check, then there is hope! Repeat the process until you get a full black nozzle check. If nothing, repeat the process once more.

If still nothing, post a new comment detailing what you have done and the results.

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You are getting leakage from one color cartridge to another. Do deep cleaning and run nozzle check. You may have been using non-Cannon inks. They can corrode the ink cartridge seats due to inferrior quality ink. You may need to replace the print head. Check out Cannon web site under this printer support. Print head is in the $50 neighborhood.

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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). Is there any sign of ink on the paper. Try up to three
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If these actions produce no positive results, or if you have already done lots of head cleans with no result, and you're sure you have a good ink cartridge properly installed, then you can try soaking the print heads for 24 hours (or more), as follows. Turn the printer
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Look inside the print head parking area on the right and you will see a rubber cup that comes up to cover the print nozzles when the head is parked (to stop it drying out). Use a syringe or dropper to fill this cup with head cleaning fluid or distilled water. DO NOT USE TAP WATER. Carefully push the print head fully into its parking position so that the cup full of fluid comes up over the print head. Leave this for at least 24 hours, then try a head clean again. Repeat this process again if necessary.

If still nothing, it looks like you may have a failed cyan print nozzle I'm afraid, or some other internal problem. This will require checkout by a Technician. Make sure you compare the cost of repair with the cost of a new printer!

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Are you confident the new cartridges are full and in-date? Can you confirm that the old cartridges were not removed until immediately before the new cartridge was installed. Did you remove the yellow tape from the new cartridges before you installed them? Were the cartridges changed properly such that an ink charging cycle occurred. Have you carried out any head cleaning cycles recently? If not, do it. Then do a nozzle check print. Any improvement? Yes, but not perfect? If so do a couple more head cleans and nozzle checks. If still not perfect, let it rest for 24 hours to disperse air bubbles. Then repeat.

If you have already done lots of head cleans with no result, and you're sure you have good ink cartridges properly installed, then you can try soaking the print heads for 24 hours (or more), as follows. Turn the printer on, and as soon as the print head moves pull the power cord out of the back, or turn the printer off at the mains. You may now carefully move the print head by hand over to the left hand side out of the way. Look inside the print head parking area on the right and you will see a small rubber cup that comes up to cover the print nozzles when the head is parked (to stop it drying out). Use a syringe or dropper to fill this cup with head cleaning fluid or distilled water. DO NOT USE TAP WATER. Carefully push the print head fully into its parking position so that the cup full of fluid comes up over the print head. Leave this for at least 24 hours, then try a head clean/nozzle check again. If still nothing, post a new comment detailing what you have done and the results.

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