I noted a color shift in by BW prints after refilling all cartridges. Noted that two nozzles were not functioning. six boxes on nozzle check print properly, two show only a few “dashes”. I noted one nozzle failing this test about two weeks ago. now after the refill, things are worse! No carts ran dry. I ran several nozzle cleaning cycles without improvement. The printer sees light use. I have not used up my first lot of inks ( two years old ; 125 ml bottles ) recently, i replaced a battery of a cart that would not register after refilling, with resolution of the problem.
Not sure what to think. With light use, I would guess against a need for cleaning due to excess ink in the capping station.To visual inspection, it seems to me rather clean. Did pigment come out of suspension? should I try to clean with cart filled with Piezo Flush as you describe???