I just wanted to let you know what i had discovered, I have purchased Head unit for Epson 10600 which comes with 3 heads, I have extracted 3 heads and have installled them in my Roland CJ-540 and they work pefect, I did not change head rank and it doesnt make any diference. Actually I think it prints better than before. I think Epson keeps better heads for themself and gives second class heads to Roland, Mutoh etc,,, I am using now aquius ink but i am planing to convert it to eco solvent in one week, I have parts ordered, I am planing to clean the system with windex prior to inserting solvent cleaning cartridge, I will let you know how it goes,,,,