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

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Canon pixma mp780 - vertical line on printing

I have recently been getting a vertical line from the 3ebk cartridge only & only on printing (not a glass cleaning issue on fax/scan/copy). i have run numerous cleaning, head alignments & roller cleaning to no avail - any ideas???

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Re: canon pixma mp780 - vertical line on printing

Not sure if this will help but there is a small glass panel to the left of your flatbed scanner- this must be clean or else I get a black vertical line in my printing.

Posted on Jul 27, 2007

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Re: canon pixma mp780 - vertical line on printing

There are a number of issues that cause vertical lines in printing. If you have cleaned all the glass panels and roller,the next primary cause is a blocked printhead but people have success cleaning and refilling cartidges as I do. How old is the cartridge, as they do eventually wear out due to the printhead points wearing out(hold the cartridge to the light and look on the printhead, do the points appear scratched or white dots? This indicates replacement. How much ink is left? When black ink is low but not low enough to show a message, sometimes vertical lines can appear. Try checking ink status, or try refilling ink if you know how. If this issue reoccurs with a new cartridge it more than likely could be the printers printhead and not the cartridge. Cartridges can become clogged if not printed with for a while. Try standing the cartridge on newspaper for a while. Blot it dry and retry it.

Posted on Aug 09, 2007

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Canon Pixma MP780

You get that message when the printhead goes bad. It's not the ink cartridges. You need a new printhead
# QY6-0049-000 around $60.00

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Main black print(BCI-3eBK)seems clogged and nozzle check shows only partial pattern. The cartridge seemed to be stuck to the print head. This happened before about two months ago. My technician cleaned it....

Sounds like you need a new printhead, and the only thing you need for cleaning is a damp cloth. All the Canon inks are water soluable. The printheads don't clean very well and don't last long if you do clean them.

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Hi, our black 3ebk will not print. we have deep

Check if there is a tape over the top vent intended to let air into the ink tank and so ink can flow out to the writing head.

Sep 27, 2009 | Canon PIXMA MP780 All-In-One InkJet...

2 Answers

3eBk will not print. Canon MP780

Replacing the printhead may work, but it could be a problem with the cleaning assembly. Take out the 3ebk and run a cleaning, if the ink goes away on the pad where the ink cart. goes, then clean assy. is OK, and you need a new printhead.

Jul 14, 2009 | Canon PIXMA MP780 All-In-One InkJet...

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The printhead is plugged or burned out for the 3EBK. You need a new printhead, QY6-0049-000, around $40.00.

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1 Answer

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Ok what you need to do is make sure that the ink cartridge is properly inserted all the way. If it's not then you won't be able to print out black ink at all.

Jun 17, 2009 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

I can't print ordinary black text any more

In fact, I ran a couple more ordinary cleaning sequences with a new cartridge in place, and it prints normally now. The only anomaly is that the ink-level panel still shows the 3eBK as being half-full (which is the level it showed when I discarded the previous cartridge).

Dec 03, 2008 | Canon PIXMA MP780 All-In-One InkJet...

2 Answers

PIXMA MP780 printing trouble

If you haven't done so, I would try another new cartridge. It is entirely possible (and occurs frequently) that you got a bad cartridge. Assuming you removed the tape from the cartridge before putting it in, this is generally indicative of either a bad cartridge, bad print head, or that heads or ink tanks may need cleaning.

The Canon support page for this printer is at:

However, as Canon pages come up as generic pages (without the text I input for you), you will have to type in "missing black ink" (without quotes), to see the material they have posted in this regard. You will find instructions there in regard to how to clean the print heads, etc., if that is necessary. However, I would definitely try another cartridge first, especially if you haven't had that much use on the printer, such that you think these other measures may be necessary.

Please post back if you need further help, otherwise thanks for rating FixYa!

May 27, 2008 | Canon PIXMA MP780 All-In-One InkJet...

2 Answers


when they say TONER , its refering to the INK CARTRIDGES , Color & black ,
CANON PIXMA MP780 & MP750 uses the same INK CARTRIDGES :
BCI-3eBK for BLACK & BC-31C for color

please rate this solution , hope this helps

May 01, 2008 | Canon PIXMA MP780 All-In-One InkJet...

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