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Remove the print head and soak it for three 5-minute cycles in hot
(~170 F) distilled water about 3/4 inch deep with continuous mild
agitation. The first soak quickly turn the water black, the second
end with the water a dark grey color. The hot distilled water dissolved the dried ink in the small ink
passages from the cartridges to the ink ejection part of the print
head. Carefully dry the print head as per instructions, clean the
electrical contacts on the printer, and placed the print head and the
ink cartridges in the printer.Turn off the printer, then unplugged it for one minute.Then turn it on...and print an alignment sheet...
you may try
1) color ink cartridge--- no enough ink or the cartridge ink channel dryer and constipated, refill ink and put down the cartridge bottom surface to water a little for 1 hr, then set back. or change a new cartridge if not fixed go next
2) print head--- the ink channel dryer and constipated, take out print head clean it's ink channel using cleaner or steep in water (do not touch circuit pin area with water) 20 minutes or longer. then set back and test (you can do more times), still not fixed, your print head have to change.
My HP Deskjet 6940 is not printing. The color (left) low ink light is dark and the black (right) low ink light is flashing. I replaced the black ink cartridge with a new one but the low ink light continues to flash. No tears/rips in the circuit strip and all the copper leads appear to be connected