D120: Only blue color is printed

Hi,

Due to the famaous CONVID 19, I needed to use again my olde printer D120 from EPSON. I bought for 70€ cartbridge … but only the blue is being printed!

After so many cleaning, maintenance, and tests as requested by EPSON official website, I finally empty my blue cartbridge as it seems that it was the only color willing to be printed …

Any idea about what I should no next?

Any idea about what I should dissablemble to physically clean it and remove the old dry ink not allowing the new ink to be spreaded in?

Thanks for your support.

Nice day and stay safe.