Update 4
Been conducting additional readings and found a site where many reported using
nail remover as a cleaning fluid?
Others were reporting blowing compressed air, carefully, off a bottle of Dust-Off, to clean the head? With good results.
So, having nothing to lose, I gave both of these "techniques" a try.
And I took a hi-res picture of the head after doing injecting nail polish and blowing air.
Here is a link to a high-res 19 meg RGB TIFF image, showing the face of the head with rows of tiny dots of fluid.
http://sdrv.ms/1dk3Ve9(I could not get the server to accept a low-res version of the file)
This, to me, suggests that the head is not "physically blocked" by dry ink.
Some member has suggested in this thread that, having originally circulated 95% alcool and Windex through the head, that this effectively "killed" it. But in my research, I have not come accross a comment to sustain this view? Other than a reply by John Cone :
I would not have recommended alcohol because of the amount it dries, nor windex because it contains too much ammonia.
At this point - your head is not functioning and it does not sound like a clog.
I think it may be damaged beyond PiezoFlush to repair.My hypothesis today is still that the vacuum pump failed? But I won't know until I dismantle the right side of the printer to get to the pump cap assembly.