Question about HP Officejet Pro L7780 All-In-One InkJet Printer
First try cycling the power to reset the unit. Turn off the printer. Then unplug the power cord from both printer and the outlet. Wait at least 30 seconds then plug it back into the outlet and then the printer. Turn on the printer.
If the error persists, clean the print head contacts. With the printer on, open the top cover. Press and hold the OK button for 5 seconds; the carriage will move to the left side of the printer. Release the OK button. Wait until the carriage is idle and silent. Unplug the power cord (do not use the power button to turn off the unit). Lift the handle on the print head with the error message (all for you but do them one at a time). Pull out the printhead from its slot. With a dry, soft, lint-free cloth wipe the copper electrical contacts on the front (not the nozzles at the bottom). Repeat until all the left over ink is gone and then dry with a new, clean cloth. Use another dry, soft, lint-free cloth to clean the contacts inside the printer. Remove any lingering debris.
Plug in the power cord and press the power button. Reinstall the print head (the screen should be reading printhead missing). Make sure it is firmly in place with the contacts touching the ones in the printer and the latch is secure. Repeat the steps for the other print head. Then close the top of the printer. Print an alignment page (should be automatic).
If this doesn't work, try a new print head (HP not remanufactured). The final option is servicing the unit.
I hope this helps.
Posted on Apr 25, 2010
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Posted on Jan 02, 2017
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