I have an Epson R2880... it has sat largely unused for several years (!). With an infant I now have some motivation to print... so I broke out the printer.
Originally, the cyan channel was like 95% blocked. Magenta was maybe 5-10% blocked, Yellow maybe 20% blocked. All other channels looked clean on the nozzle check.
After trying some windex/distilled water on a towel under the head, without success... I did some internet searching and came to PiezoFlush and the injector. I ordered this, and it seemed to largely clear the Cyan channel. I did notice some red in the cyan channel, which I perceived to be some remnant (red) piezoflush. Coincidentally, I had several OEM cartridges almost out at the same time, and I wasn't about to replace half the cartridges just to run another test. So, I couldn't fully test, but went out on a limb based on discussion with IJM and ordered a set of the ConeColor.
Tonight I installed 6 ConeColor cartridges, leaving OEM Yellow and Black that were nearly full. After running an Auto Nozzle Check and Cleaning, the pattern started looking very clean for Yellow, Cyan, and Magenta sections -- which started out very blocky. There also was some initial Cyan showing in the yellow, but the yellow channel eventually went back fully yellow. Of course, the one issue being that the Magenta section was looking like straight up cyan.
Now, thinking that perhaps something was going on with the magenta channel, I went to go do a piezo flush on it, with the adjacent cartridges pulled out. When I did, I got cyan coming back out the top side nipple, where the cyan cartridge attaches.
Has anyone seen these issues before? Symptoms seem indicate some internal damage to the head or possibly blockage on the bottom of the head, on the Magenta channel (which did recently seem to run a nozzle check fine).
Any insight is appreciated! I'm hopeful this does not mean the head is shot.