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

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Just replaced the 3E black cartridge and now nothing prints

Everything was working just fine till the 3e cartridge had to be replaced.

Now there is no print at all - from any color cartridge! What does that mean and if it is that printhead is plugged or burnt out and has to be replaced, would that have happened all of a sudden?

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It can happen all of a sudden, the printhead is much like a light bulb and quits when you least expect it. In your case it is possible that the purge unit has gone out, which is the part that cleans and primes the printhead. A shop could tell you which is bad so you don't replace the wrong part.

Posted on Jul 02, 2009

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CANON MP780 BLACK DOES NOT PRINT

This is what works for me. Try at your own risk.


If the printhead is not clogged:


CLEAN PURGE MECHANISM:

You will need a light. 1) Unplug the printer and move the printhead all the way to the left. On the far right are two rectangular basins. The smaller one is black. Take your fingernail or a tweezers and lift out the sponge pad (do not drop it). Soak the sponge pad in Windex until it turns white. Plug in the printer. 2) Fill a syringe with Windex. a. Fill the basin with liquid. b. Let it soak for 5 minutes. c. Turn the printer off. d. Turn the printer on. Repeat steps a-d until you see a small hole in the basin. e. Put the syringe over the hole and fill the basin, pushing the liquid into the hole. f. Let it soak for 5 minutes. g. Turn the printer off. h. Turn the printer on. Repeat steps e-h 5 to 10 times. 3) Put the sponge pad back in using your fingers (do not drop it). Unplug the printer. Plug in the printer. Turn the printer off. Turn the printer on. Do a clean cycle.

Posted on Jan 04, 2011

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