Question about HP Officejet Pro L7780 All-In-One InkJet Printer

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How to change ink cartridges Pro L7780 All-in-one

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Do you mean the ink cartridges or the printheads...

If it's the printheads see this solution:
http://www.fixya.com/support/t1407056-printer_print_in_black

It it's the cartridges you just open the little door (left/front of the printer), remove the cartridge which is flashing red and then put a new one in the same way.

Posted on Jan 29, 2009

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Officejet Pro L7780 All-In-One InkJet Printer: the paper keeps getting caught underneath the ink ...


Hi,

Perform the steps given in the web link and check.

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00839319&tmp_task=solveCategory&lc=en&dlc=en&cc=us&product=2512010

May 18, 2010 | HP Officejet Pro L7780 All-In-One InkJet...

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HP Officejet Pro L7780 has stopped printing in black after changing yellow cartridge. Black is barely showing in spots. Have cleaned the heads and restarted twice and black cartridge is almost new, at...


I have to ask this question of you, just to make sure this is not an issue. Are you using a factory new ink or toner cartridge?
Please consider the following:
If you are using a refilled or third party cartridges that may well be your problem. Most manufacturers build logic into their products to prevent the use of “Other Equipment Manufactured” cartridges as well as re-filled cartridges.
They do this to prevent problems from contaminated inks or toner causing problems with print quality or damaging the physical printhead or photo conductors.
If you are using factory new ink or toner cartridges, then please call the manufacturer’s Technical Support for assistance with the warranty on the cartridges
Don

Feb 18, 2010 | HP Officejet Pro L7780 All-In-One InkJet...

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Won't recognize black cartridge on hp officejet pro l7780


Ok what you need to do is powerdown the printer the pull all ink out of the printer power it on without in then power it down again and replace the cartridges. If this doesnt work go into the control panels and select the color of the ink as only B&W and print a test page

Oct 18, 2009 | HP Officejet Pro L7780 All-In-One InkJet...

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Generic black ink cartridge not printing on hp officejet pro L7780


You should take it back and exchange it or read on below.

Most modern cartridges have an ink level chip built on to them.
Should the level drop below 25% then most of these chips lock up and will not reset.
Re-filling them will have no effect
If you are lucky you should be able to find either a resetter around on the internet
OR
Even better empty cartridges that never need to be reset.

The second option is my preference

I realise these are not for your specific printer but there are others listed on both those sites as well

Aug 27, 2009 | HP Officejet Pro L7780 All-In-One InkJet...

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Generic black ink cartridge causing black ink to not print


Never mix dye and pigment inks/machines Head could be screwed Try copying many black text only pages up to 200 but run head clean after 50 or so Inkypete

Apr 20, 2009 | HP Officejet Pro L7780 All-In-One InkJet...

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Hp officejet pro l7780


Run the cleaning tool before you print a test page.

Aug 02, 2008 | HP Officejet Pro L7780 All-In-One InkJet...

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