The machine has had very light use in its service life, since acquiring it new in 2010—244 pages is the total print count. All carts in it now are 350ml Epson inks, and all are at least half full, according to the LCD panel.
I have had clogs of various inks in the past, especially because of sometimes long idle times. All have cleared, usually in short order, never with more than three or four cleaning cycles over a protracted period.
Recently, the machine sat idle in my studio while I was away, the heat kept to no lower than 55 degrees and no higher than 68 over the course of three months. It is winter and I am in the Philadelphia area.
When last used, it worked perfectly, approximately three months ago, printing in both full color and b&w modes, and with no hint of trouble in nozzle checks before each print session.
I started the machine on my return, and did a nozzle check, which was successful, except for the green ink. For the past 10 days there has been a persistent total clog (evident from repeated nozzle checks) of the green ink. Nothing works. Using powered pair cleanings judiciously. Leaving a PiezoFlush saturated strip of virgin cleaning towel (non-woven cloth) under the printhead overnight on three separate occasions. The last resort has been an initial fill cycle using an IJM green position cart filled with PiezoFlush fluid. The nozzle check prints are perfect for all EXCEPT the green position, which is totally blank, even viewed under a loupe.
I am not prepared to attempt anything more than a thorough cleaning of the flushing box, wiper blade, and capping station, although on inspection they are not particularly clogged with crud or debris. I don't have the time or inclination to try self-repair, i.e., replacement, of the dampers, and least of all to touch the printer head or ink hoses, never mind try to replace it myself or to aspirate the green channel.
Aside from a cleaning, the usefulness of which I am skeptical about, is there anything else to try before calling in an authorized tech? The machine is long since past its original warranty, plus a two year extension, which, needless to say, was never invoked, as it always worked perfectly well. Thanks for any advice. And, lest it be mentioned, I know a new printhead is exhorbitantly expensive. It is still less than a new printer, especially one that has had so little use.