I have an Epson 9880 that developed a couple of stubborn clogged nozzles mostly in the photo black, cyan and Magenta channels. Over time a few more nozzles joined the party, the prints still looked good but the nozzles couldn’t be cleared. The final demise was when a photo black and cyan cartridge (both OEM) ran dry prematurely. After this, I pretty much lost those two channels. I tried many nozzle checks and power cleans and even an SS cleaning but it showed no signs of improvement. It also would not run a nozzle check for the colors on the left side of the machine.
I purchased some Piezoflush and refillable cartridges, cleaned the capping station and flushing box as well as the wiper and ran a couple of power cleanings to get it into the system. I also cleaned the bottom of the printhead with a paper towel coated in Piezoflush. After letting it sit for 48 hours it showed a little improvement. I ran another power cleaning and a couple of nozzle tests and let it sit again. After about a week it showed significant improvement, but not perfect. The machine would also still not do a nozzle check for the other 4 colors. So I ran another power cleaning, this time however it wiped out the center section of the photo black and magenta channels.
I have run a few prints as well as more nozzle checks with no change. I am not sure what the next step should be now. Each cartridge is about half full of Piezoflush so I can probably run another cleaning, but did not know if there was something else I should look at before continuing. Any advice would be much appreciated.
The first image is where I started, second is after a week of soaking, cleaning and test prints, and the third is where I am at now.