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

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One of my ink cartridges (magenta) is not printing despite several cleanings and replacing the cartridge.

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Your printhead is goggled 

Posted on May 02, 2010

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Have you only replaced the magenta cartridge, or have you also tried the print head. A bad print head can cause the ink to read as empty or clogged.

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MAGENTA NOT PRINTING


The other week I had the black print head clog up, requiring daily nozzle deep cleaning [a normal 'ocassional' maintenance function]. Thought I needed a new Print head, so anything worth a try.
I loaded up an old black cartridge [I load all my own......always have] with Isopropyl Alcohol and ran deep clean on that cartridge a couple of times, then repeat printed [6 times] a page full of the number 8 in about half inch character size, to get the alcohol through the nozzles. then Deep cleaned again 3 times, to wash it through the print head.

I reloaded the normal ink filled cartridge and ran the '8' page again till I got good black output. It has now been working without problem, daily, for over a week. Clearly if it's a Magenta only problem, the cleaning as described above would be a bit different, as the magenta is one of 4 colour cartridges.
My printer does quite a lot of work, and was bought at least a couple of years ago, being used daily for alpha numeric and photo printing work. This was the first difficulty I experienced with it.
Hope the above might help.Ken

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1 Answer

My magenta will not print well


Here's what you should do. Remove all ink cartridges. Get some rubbing alcohol, preferrably 91% proof (leaves less moisture) Get a couple normal paper towels. Check each cartridge for dried ink and remove it using an alcohol wetted paper towel. (The deep cleaning procedures aren't always effective.) The gold contacts on each cartridge should be gold when you are done. Use the same procedure on the gold contacts of the ink cartridge housing inside the printer. Take your time, do it well. If that does not fix the problem, then do the following. Switch the black and magenta cartridge. Some printers won't print when you do this, other printers don't know the difference. If your printer is the later, then attempt a print job using a page that has a line of both black and magenta text. If you see a black print, then the problem is your magenta cartridge (despite having installed a new one) If the magenta prints, then you know the magenta cartridge is good. If the magenta prints but the black doesn't, then you have a printer failure. Let me know your results. ZT3000 Beta tester of "0"s and "1's"

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