<p>Probably, there is a serious problem with your printer. I had the same on my 3880.<br>
It seems to be a not too rare problem with these printers. From some website, I learned<br>
that there is something called "ink selector" which has to be replaced. It always seems <br>
to affect PK.<br>
I had mine at the official Epson repair place in Switzerland, but they are incompetent<br>
there, and wanted to replace the whole print head for a price above a new printer. The<br>
head however works perfect, but just with MK. So, I am now using only matte paper.<br>
From what I read on a German website, the repair should cost about 200.</p>