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

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Canon mp780 prints photos with green tint.

Ran a nozzle check and it failed for the 6M bars. 1st bar has lines and the 2nd bar is completely white, no color at all. Tried head cleaning and head refreshing but still the same.

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5 Suggested Answers

Inky
  • 691 Answers

SOURCE: Vertical bars through printout

Look closely at the marks on the print, and in particular the distance between the lines. Now look into the printer through the paper exit path. Take note of the metal star wheels. Does the distance between the lines match that of the distance between the star wheels? If so then the plate that the start wheels are mounted into may have dropped. You can remedy this by gently lifting the plate back up by hand. Set the machine as if you where going to print a CD and simply lift the start wheel plate at each end. Do not force it or apply too much pressure. Ease it up and then try it again. If it needs more adjustment repeat and check again. If the marks appear to be caused bu ink on one set of rollers or another, pass a really thick piece of card (like off the back of an A4 refill pad) through the paper path. Spray the rollers with a cleaning solution or windowlene (windex) and then pass the card through. This will help to clean off any ink. Again you can repeat this process as neccessary. Let us know if this helps before rating - if it does not I may have more info

Posted on Jul 27, 2007

  • 1 Answer

SOURCE: Canon Pixma MP780 print quality fault

My daugther also has a Pix780 so I just replaced my print head with hers and now the colour prints great. I guess I'll try cleaning mine first and if that doesn't work, I'll purchase a new one when the dealer who services Canon opens on Tuesday. I could also buy one from the Canon website for something like $60. I copied the following from Canon's sites under the FAQs. Sounds like you may need to replace your printhead.

How does a Canon Printhead work?
The printhead delivers very small drops of ink onto the paper. The ink from the cartridge is transported via small tubes. Heating elements heat the tubes, creating a small bubble of ink. The heating element determines the size of the drop to be applied to the paper.

How do I know I may need to replace my printhead?
There are a few symptoms that may indicate printhead failure or a clogged printhead. If the following symptoms continue even after replacing the ink cartridges and trying the troubleshooting steps in your user's manual or those listed below, you may need to replace your printhead:

  • Pages come out blank, or you see poor print quality
  • Pages you print appear to be missing colors
  • Colors on the printed page are quite a bit different from what shows on the screen
  • Horizontal white lines or light-colored lines or light streaks appear throughout the page

Why would the printhead have problems?
After hours of printing, the heating elements may fail after being turned on and off hundreds of thousands of times. The printhead can also become clogged or blocked with paper debris or solidified ink. If your print quality is poor or your printer will not print at all, it may be time to change your printhead.

Posted on Aug 30, 2008

  • 1 Answer

SOURCE: Printer will not use the magenta color

I had the same problem. It is most likely that your print head nozzles are clogged. Your choices are to attempt to manually clean them, or order a new print head from Canon.

Attempt the manual cleaning at your own risk, this doesn't always work. When it does not work, it means your print head is damaged.

To maually clean the print head. Printer cover up (so you can get to the cartridges and print head). Turn the Printer Off. Remove all the cartridges (I put each cartridge in a separate zip lock bag). Then flip up the lever and remove the print head.
Now heat (don't boil) distilled water (Iused a good sized cook pan and a plastic measuring cup to pour the water). Find a container you can soak the print head in (I used a deep alluminum baking pan). Pour the hot (not boiling) distilled water over the print head molding where the cartridges seat down (hold the printhead over your diposable alluminum pan). Then dunk the molded print head part into the pan numerous times. When the water gets dark change it (be carefuill not to stain the sink). Then slowly pour the hot distilled over the print head (opposite side from where the cartidges seat in). Eventually no ink will be in the water. Set the print head on a dry paper towel, and let it dry for 24 hours or longer. Reinstall the print head, then the catridges. If it worked, your true colors will return. It make take up to 15-20 photos to get all the ink catridges flowing-be patient. You can also just wait 24 hours after re-installing the cartridges, and hopefully it will take less photos to see the correct color match.

Never keep printing when a cartridge is low or out.
Print a few prints every week. Not printing for weeks causes the printheead and the ink flow to clog!

Good luck. I just recovered my S820 and my i900D using the above cleaning method. Like everything else, your mileage may vary! It cost me $1.29 for distilled water and about an hours worth of time!

Posted on Oct 20, 2008

  • 1 Answer

SOURCE: smeared lines

Okay, this was the problem I posted a few days ago. It's fixed now, so in case you have the same problem with smearing, here's what the help desk from Canon suggested: Open the cover and remove the ink cartridges. There is a gray lever in front of the cartridges. Lift this lever and the printhead can be easily removed.
Our printhead had a buildup of black ink on the surface. I carefully removed this with rubbing alcohol. I let the printhead dry and replaced everything. No more smearing. Imagine a help-desk that actually helped!

Posted on Nov 21, 2008

  • 92 Answers

SOURCE: The 3eBK head stopped printing.

Try below some steps which might help you resolve the problem.

Print Head Cleaning / Head Refreshing If the printed Nozzle Check Pattern is broken, missing, or a specific color is not printed, clean the print head.

  1. Press the <Menu> button on the printers operation panel repeatedly until [MAINTENANCE] appears in the LCD.
  2. Press the left [<] or right [>] arrow buttons to select the cleaning setting you want. Select [HEAD CLEANING] or [HEAD REFRESHING] for deep print head cleaning.

    Note: [HEAD REFRESHING] uses more ink than [HEAD CLEANING], so perform [HEAD REFRESHING] only when necessary.
  3. Press the <OK> button.
  4. Print a Nozzle Check Pattern and perform at least two Head Refreshings if the pattern is not correct.
If this does not help, try removing the print head and then install it again. Once place, dont forget to aligh the head. Following are the steps:

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).

    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
    (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. 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.
I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.

If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!

Posted on Apr 26, 2009

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