I recently acquired a used Epson 9900 with an apparently clogged head. Since I had previously purchased a Piezo flush kit for the transport of my 7900, and the 9900 was very cheap it seemed worth a try to revive the printer. Prior to loading the flush kit I ran some standard and power cleanings. The test prints varied from print to print showing at times a fully printing color, then missing sections in a color, or no ink in a particular color.
A few colors consistently printed at least some solid color, but the missing sections seem random. The prior owner thought some air had gotten in the lines.
Since these results were unsatisfactory I loaded the Piezo flush carts and ran an initial fill. This seemed to clear some areas a bit, but then not. However, even after running a couple of initial fills, the Piezo flush has not made its way to the printhead. Checking the carts, they seem to be at the same level of fill as when installed. Is it possible there is an air or vacuum blockage, and if so how would I clear that? Alternately is it possible that ink has dried in the lines? What else could be preventing the flush rom loading? I can see that the maintenance cartridges have received some ink, and I think every color has printed at at least a couple of lines at some point in testing.
Also, during the various initial fills the VLM cart showed as depleting more rapidly than the others and is currently showing as too empty to run a cleaning or fill (although it still is 1/3 full of piezo flush). I have tried to reset it with the chip resetter but it no longer seems to take the reset.