Two days ago I fixed a No Yellow problem on my HP printer cartridge (HP
722).  These cartridges are the sponge type and do occasionally trap air
bubbles in the sponges.  I cured mine with a sharp rap down on a firm
surface.  I wrapped tissue paper on the nozzle to catch the ink that came
out of all the chambers and then rapped the wrapped printing end on my desk
two or three times.  It had been skipping and erratic in printing yellow
for three or 4 weeks, but I had not had time to investigate. I read about
the trapped bubble problem on an inkjet re-filler company troubleshooting
page.

Hope this works for you.

Doug

At 9/10/99 08:49 PM , Michael Wosnick wrote:
>I have an HP DeskJet 722c inkjet printer that has decided it does not
>like yellow anymore. It prints beautifully in black, but when doing
>colors, no yellow appears anywhere. I have gone through the cleaning
>exercise, and the 'priming' exercise, but still no yellow. I have
>replaced the color cartridge but that didn't help either. All other
>colors print just fine in the test cleans etc, but not even a small
>trace of yellow anywhere...
>
>Does anyone have any idea what might be wrong? I am afraid to try and
>actually clean the cartridge contacts etc for fear of damaging nozzles
>or other important stuff. It seems odd that one color only should be
>blocked however.

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