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

2 Answers

No color printing is occurring. Have deep cleaned the printer a number of times & the ink cartridges are brand new. What else can be wrong please?

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  • jcmurphy May 14, 2009

    No luck with water or ammonia mixture. Any other suggestions please?

  • jcmurphy May 15, 2009

    Have already checked this. Sounds like a new printer head or printer is the only way to go.

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2 Answers

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Assuming the problem is in printing mode and not Copy mode (in copy mode there is color button and black and white button) and the software that came with the all in one machine has been installed, you need to change the printer settings. To do this, do the following:

  1. Go to your Printer folder
  2. Locate your printer and Right click on the printer
  3. Select "Properties"
  4. Select the "General" tab
  5. Select the "Printing Preferences" tab
  6. Select the "Advanced" tab
  7. Ensure the "Print all text as Black" option is "Disabled"
  8. Select the "Color" tab
  9. Ensure the "Print in Grayscale" box is unchecked
  10. Click on "Apply" to save your new settings
  11. Click on "Print Test Page"
The Test page should print in color
I hope this solves your color printing issues. Best of luck and please respond with your results. All the best!
Greg.

Posted on May 14, 2009

  • Greg Margossian
    Greg Margossian May 15, 2009

    Now that we've ruled out printer settings, the problem must lie in one or two places. Further research has uncovered 2 other possible solutions to your problem. It turns out this is a common issue with your model printer. Canon's solution is to keep trying to sell their customers new print heads.

    One Canon authorized technician found that a dirty "purge unit" That customer could only print color and not in black but the problem mirrors yours in that the printer wouldn't print both print heads.

    The other solution was to actually "wash" the print heads themselves. Taking the heads out and gently washing them with water and thoroughly drying them worked for their similar printing issues. I'd try both of these solutions before shelling out money for new print heads or a new printer. I hope this solves your printing issue. Let me know how you make out.
    Greg


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Canon printers have a semi-permanent printhead. It's the 'holder' that the ink cartridges (tanks) fit into. It can be removed fairly easily. Over time, it can and does become clogged, mainly from letting the printer set without use. You need to print both black and color at least once per week in order to prevent clogging and keep the ink flowing.
Normally you can clear up minor clogs and streaking by running the cleaning cycle found in your printer's software utility. For quick access to your printer's utility (drivers): In your browser's address bar type: control panel\printers and hit 'enter' on your keyboard. This will bring up a page with your installed printer's icon. Place your mouse cursor over the printer icon and 'right-click' on it. When the dropdown menu shows, click on 'properties'. This will bring up the printer utility. Look for the 'maintenance' tab and follow the cleaning prompts.
If the cleaning cycles don't do the trick in clearing up poor and incomplete output, don't give up and assume you'll need to buy a new print head (they often cost more than a new printer!). You can try the following as it will cause no harm: (we and many others have succesfully done this)
Remove the ink tanks from the printhead (tank holder) and seal them in a ziplock plactic bag. Set them aside, preferrably propped upright. Next remove the print head, it snaps out. Use the kitchen or other sink and turn the water on so that it is running slowly and that it is warm. Hold the print head, bottom facing down, and cup your hand under the running water so that the water fills it up and flows into the the print head. This will flush the ink out of the printhead. You'll need to turn the print head over, bottom side up, and flush it that way as well. You'll see when there is no more ink being flushed out.
You WILL need to do a final flush/rinse with some distilled, or purified water. This ensures that any risidual minerals or impurities of the tap water are flushed out of the print head. Set the print head on a paper towel to dry, drying time will vary. TIP: To expedite the drying process, shake the printhead vigorously as there is a fair amount of water retained after rinsing!
Place the printhead (tank holder) back in the printer and reinsert the inks tanks. The printer should automatically do a print head alignment. If it doesn't, manually perform a "Printhead Alignment" through the printer's utility. Next, run the "printhead cleaning" cycle and print a nozzle check.
Here's another, similar method:
Open the lid of the printer and when the print head moves to the left, remove the cartridges (tanks). You should then be able to easily remove the print head. It has the circuitry on it and on the bottom are the outlet nozzles.
Get a small, shallow pan and lay a couple of paper towels in the bottom. Heat up (via microwave) enough purified/bottled water to cover the paper towels. Set the print head on the towels. You should see ink 'bleeding' out. Move the print head to several different spots (about a minute each spot). This will dissolve the ink clogs. Remove the print head and gently dab it dry on fresh paper towels.
Place the print head back in the printer and insert the ink tanks.Run a print head alignment and a regular cleaning followed by nozzle check and test print(s). That should do it. If not, repeat the above procedure(s).
If the above two methods don't quite do the trick, try this:
Remove the ink tanks and printhead (cartridge holder) from the printer as instructed above. Get a small bowl, dish or pan, large enough to accommodate the printhead. Lay down a layer or two of paper towels in the bottom of the container to protect the printhead circuitry from contact damage.
Make up a 50/50 mixture of ammonia and distilled water, about a pint will do. Heat the mixture up in the microwave for about a minute or so, not boiling. Slowly pour over the paper towels so that you have approximately 1/2 inch mixture total. Set the printhead (cartridge holder) into the container and pour some of the remaining mixture over the top, just enough to wet it good. Let it soak for several hours (3-4) or overnight. You can move it slightly to a different spot every hour or so.
Remove the printhead and rinse thoroughly with distilled water. Shake it dry, set it on folded paper towels to air dry. Reinsert the printhead and ink tanks. The printer should do an automatic "Printhead Alignment", if not manually do so and run a cleaning cycle or two followed by printing a nozzle check pattern to check your progress. Repeat as necessary.

Posted on May 14, 2009

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http://www.mediafire.com/?nmj5nnzzjaw


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