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

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MP780 will print graphics but not text

The printer works fine if I'm printing a photo but will not print any kind of black and white text. What do you suggest?

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Re: MP780 will print graphics but not text

Thanks for your suggestion. I replaced the print head last week and the problem was resolved. I read elsewhere that these print heads often require replacement after a year of minimal use. My data supports the hypothesis!!

Posted on Nov 12, 2007

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Black and white prints are not black

Sorry, steve, that you are experiencing this problem.

According to's website regarding the i9900 InkJet Photo Printer:

Why color ink may be used when printing in black and white Even when printing in black and white, color ink is used for the following reasons:
  1. Automatic cleaning of the print head.

    To prevent the print head nozzles from clogging, the print head is automatically cleaned periodically. At that time, a small amount of each color ink is consumed.

    Therefore, although printing in black and white is performed, color ink is also consumed.

  2. Color inks may be used to create black.

    When printing in grayscale or on photo paper or when duplex printing, although printing appears in black and white, the color black may be created using the three (cyan, magenta, and yellow) color inks. Printers without a pigment black tank / cartridge will print black / grayscale will create a composite black using color ink even on plain paper.

    Therefore, although printing in black and white is performed, color ink may be consumed.
  3. In order to keep the heavy black ink from smearing on the page or in the printer, color ink is used when duplex printing to help create black text.

I might suggest taking out the color ink cartridges leaving only black there, but some printers don't take kindly to this. So, you may have to further experiment with magenta, cyan, and yellow to make it at least seem b&w to your best eye's judgment.

Good luck on this.

Jul 13, 2010 | Canon i9900 InkJet Photo Printer

2 Answers

My black ink will not print. Do I have to have

The larger of the two black cartridges is used for text only printing.

The saller cartridge is used for black in graphic images or pictures.

This saves you color ink . It allows you to put the black ink on the image without making the color inks blend the black ink.


Jan 31, 2010 | Canon PIXMA MP780 All-In-One InkJet...

2 Answers

Vertical and horizontal lines when printing photos - HP Photosmar

it sounds as if you may have the picture quality set to draft, its worth a check, especially if printing is ok. Does it print colour writing well too or just black, one of the colour inks may have a block or be low, go into printer settings menu and check what print quality its set for.

Apr 25, 2009 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer


This may sound a bit dumb, but believe me as a tech support specialist, I have seen it happen. If you are trying to print a document, what color do you have set for text? I had a lady who wanted the text to be white on blue on the screen in Word and instead of setting it with a blue background and "auto" text, she set the text as white. White print on a white background (paper) doesn't show up...:-)

May 28, 2008 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

Text Not Printing

You are out of black and white ink.
Graphics are printed with the color cartrage
text is printed with the black and white.

Apr 30, 2008 | Brother MFC-8440 All-In-One Laser Printer

1 Answer

MP780 prints will not print black in photos, black text works fine

thats your service manual
i clean mine by boiling it in rubbing alcohol or submerging it in alcohol then blowing it out

Nov 13, 2007 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

Won't print black: refuses to change form 'Fine Photo Pro' mode

click on start > printer and faxes then right click on the printer and click properties

change your settings there

Oct 09, 2007 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

Printing in black and white - not greyscale

When in page set up or similar you should see an black only option.-or see your on disk manual This will serve fortext- However if graphics are Incorporated all colours are printed to obtain a black

May 09, 2007 | Epson Stylus Photo R220 InkJet Printer

2 Answers

Printing problem

The black cartridge printhead needs to be cleaned or replaced. Follow your printer manual instructions.

Mar 18, 2007 | Canon PIXMA MP780 All-In-One InkJet...

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