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This probably could be defective Printhead ( black/yellow )
Follow the steps below and it should resolve the issue, if not, you need to replace the K/Y Printhead. You can purchase it from any nearest departmental store like bestbuy or costco or walmart etc or Call HP and order one.
Open the front access door. ( printer must be power on ) Remove the Latch of the Printheads Remove the Printhead Clean the Contacts with lint free cloth ( golden contacts or electrical contacts / not the nozzles ) Re-install the Printhead back in its position and close the front access door. The printer usually goes thru initialization process. or Turn off the printer and turn on. If you still get the error message, Replace the K/Y Printhead.
Regards, Ron
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The following may work: remove all the ink supplies. Remove the printhead and soak it for about 5 minutes in 0.5" of very hot water. Gently blot the printhead on a soft damp paper towel to remove the excess water, then replace in the printer and then reinstall the ink supplies.
Hello and welcome to FixYa!
In the HP OfficeJet Pro L7780 the printheads are actually separate from the ink cartridges. In your case, it sounds like the black/yellow head has worn out and will need to be replaced. The good news is, this is a user replaceable part. The bad news is, the replacement heads are not cheap. Amazon has the HP 88 Black/Yellow printhead listed currently for about $61.
http://www.amazon.com/HP-Yellow-Officejet-Printhead-Packaging/dp/B000BO9L8M/ref=dp_cp_ob_e_title_0
YouTube has a nice video that explains how to install the printheads here:
http://www.youtube.com/watch?v=8Zl0LUxBSvg
I hope this helps!
Have you tried to replace the black/yellow printhead? This is not the same as the ink cartridges, but it is located in the compartment under and to the right of the scanner lid. Here is HP's link. It looks like this...
Can you confirm that you are using a CIS or non-HP cartridges with this printer?
It sounds a lot like the printhead has reached a clogging point where sediment has built up in the black portion and loosens enough to printer a few lines before it re-asserts itself again.
Based on my experience of this printer, if you're using a non-HP delivery system for ink then you should consider replacing the black ink with a dyebase alternative instead of pigment.. Replacing the Black/Yellow printhead and running a number of test prints to purge the pigment ink in the printhead should then result in a clean and more reliable printout in future.
One other vector for problems is the cleaning area and I've found that this can become soiled with excess ink causing cross contamination within the inks of one printhead. As yet I've not found a reliable solution to counter this sort of issue.
Hope this gives some clues and hopefully some ideas of a fix.
Re-insert the print cartridges. It is also possible that the heads are burnt. Get a new set of print heads (black/yellow) and install to the printer. If problem persists, clean the contacts on the printers. Use acetone + cotton swabs.
try to re-install the driver of your printer and then try to unhook the cartridge and then clean up the nozzle used alcohol and cotton buds and then placed it back the cartridge correctly!!!
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