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

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Will not print 6BK

I can't get the 6BK cartridge to print at all. I've changed the cartridge, deep cleaned a few times. Nothing there. What's next. I do have a spare print head.

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  • rs6er May 29, 2008

    I had already removed the print head. The small black ink cartridge port on the head was covered with dry ink. I cleaned it with alcohol and reinstalled it. Now it works fine.

  • old marine
    old marine May 11, 2010

    What model printer?



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I followed the intstructions posted here for reseating the print head.
I took it out and cleaned it and removed some excess ink and cleaned off the ink pad the ink cartridge touches and then did a deep cleaning and printed a test page and then my own doc and it worked!!!
thanks for the info on this web site!

Posted on May 31, 2008

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Please see the Canon link below, and as Canon links return generic pages, type in "missing black print" (without quotes) or something of that nature. The results will include Reseat/remove printhead, among others. I have reproduced that content for you below, but I would also add that a number of folks have issues with black print cartridges, and it seems this is an issue that is fairly widespread, as one of the results is that your printer may need repair. If you have tried more than one cartridge with the same result, suggest consulting support if you don't think your usage justifies a new print head - especially if you are still under warranty. Page link is:
---------------------From Canon-----------------------
Issue: How do I reseat / remove the print head?
Solution: Reseat MP750 / MP780 print head

Reseat Print Head Reseating the print head is seldomly needed to be done.

  1. Press the Open Button (1) to open the Paper Output Tray (2).

    Will not print 6BK - mp780_openbutton.gif

  2. Raise the Scanning Unit until it stops.

    1. Pull and hold the Scanning Unit Lever towards you, then raise the Scanning Unit.
    2. The Print Head Holder moves to the middle.

  3. Open the Inner Cover 1.


  4. Open the Inner Cover 2.



    a. Do not try to manually move or stop the Print Head Holder.

    b. Do not touch any metal parts.

  5. Press the ink tank's tab (1), then remove it from the slot (2).

    Handle ink tanks carefully to avoid staining clothing or the surrounding area.

  6. Lift up the lock lever and taWill not print 6BK - mp780_ph_removed.gifd.


  7. Again, place the print head back Will not print 6BK - mp780_ph_inserted.gif down the lock lever.


  8. Insert the ink tank into the empty slot on the print head. Press down gently on the ink tank until an audible click isWill not print 6BK - mp780_inktankclicked.gifk tank is in the correct slot.


a. Make sure that the ink tank is inserted in the slot that corresponds to the ink tank's color.
b. If the ink tank is inserted in the wrong slot, perform two head refreshings.
  1. Close the Inner Cover 2.
  2. Close the Inner Cover 1.
  3. Pull the Scanning Unit Lever towards you to close the Scanning Unit.
  4. Align the print head position after the print head is installed. You can align the print head position either automatically or manually. When automatic alignment does not work well, align the print head position manually.
Automatically Aligning The Print Head Position:
  1. Load A4-or letter-size plain paper in the paper support tray. Auto alignment cannot be performed when the Feed Switch is set to [CASSETTE].
  2. Press <Menu> repeatedly until [MAINTENANCE] appears.
  3. Press left or right arrow to select [AUTO HEAD ALIGN].
  4. Press <OK>. The print head position alignment pattern prints.
  5. Check the printed pattern. If the printed pattern matches the illustration, the print head position alignment is complete.

Manually Aligning The Print Head Position:
When automatic alignment does not work well, align the print head position manually.
  1. Load A4- or letter-size plain paper in the paper support or cassette.
  2. Select the paper source with <Feed Switch> button.
  3. Press <Menu> repeatedly until [MAINTENANCE] appears.
  4. Use left or right arrow to select [ALIGN PRINT HEAD].
  5. Press <OK>. A horizontal pattern is printed.
  6. Beginning from columWill not print 6BK - mp780_alignment1.gif enter checkmarks in the patterns that have the most solid image.


    (1): Bad example (Least solid box)
    (2): Good example (Most solid box)
  7. Press left or right arrow to select the pattern number that you checked in column A on the printout in step 6.
    (A): Column
    (0): Select pattern number with most solid image
  8. Press <OK>.
  9. Repeat steps 7 and 8 to adjust columns B to L. When all the horizontal patterns are adjusted, you will be prompted to print a vertical pattern [PRINT VERT. PATTERN].
  10. Press left arrow. A vertical pattern is printed.

  11. mp780_alignment2.gif

    (1): Bad example (Least solid box)
    (2): Good example (Most solid box)
  12. Press left or right arrow to select the pattern number that you checked in column M on the printout in step 11.
  13. Press <OK>.
  14. Repeat steps 12 and 13 to adjust column N.
Please post back if you need additional help. Otherwise, thanks for rating FixYa!

Posted on May 28, 2008

  • Cheryl Whalen May 29, 2008

    Glad to hear that it all worked out! Sorry there was such a delay in response, I just happened on your issue yesterday - again, glad that you are fixed up, and please don't hesitate to post again if you need help. Feel free to post to my "expert account", and I will get back to you ASAP. Best wishes -




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