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

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Washed out prints

Since printing 40 cd labels for the local church my canon has nerver been the same. It has all new ink catridges and alignment, cleaning rollers and nozzles etc and all i get is a washed out print on all settings even when i use the manual colour management option. I'm asking for you help as a last ditch effort before I toss this unit in the river and start a new. any thoughts?

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Have you tried taking the print head out and cleaning all of the gummed up ink out of it. We had our black just quit on us and were just printing pale copy. There was an unbelievable build up on the print head. Another thread about the black not printing any more has a lot of stuff on this.

Posted on Aug 05, 2008

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Posted on Jan 02, 2017

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Wron catridge


Try to reseat the 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).

    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.

      mp780_scanunit.gif

  3. Open the Inner Cover 1.

    mp780_innercover1.gif

  4. Open the Inner Cover 2.

    mp780_innercover2.gif

    CAUTION:

    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).

    mp780_inktankremoval.gif

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

  6. Lift up the lock lever and take out the print head.

    mp780_ph_removed.gif

  7. Again, place the print head back in position and press down the lock lever.

    mp780_ph_inserted.gif

  8. Insert the ink tank into the empty slot on the print head. Press down gently on the ink tank until an audible click is heard. Make sure the ink tank is in the correct slot.

    mp780_inktankclicked.gif

    IMPORTANT:

    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.

  9. Close the Inner Cover 2.

  10. Close the Inner Cover 1.

  11. Pull the Scanning Unit Lever towards you to close the Scanning Unit.

  12. 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 column A on the printout, enter checkmarks in the patterns that have the most solid image.

    mp780_alignment1.gif

    (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
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  8. Press <OK>.

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  10. Press left arrow. A vertical pattern is printed.

  11. Beginning from column M on the printout, enter checkmarks in the patterns that have the most solid image.

    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.

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