Need Help Roland UG 642 Nozzle test missing

[Mahmood]

Hello guys, I need help plz
Roland UG 642
I have problem Group B Cyan in Nozzle test missing
Service Call : 0380 0080

I try powerful clean, manual clean, Ink Renewal

After long attempts, the print head worked on its own for a week and then stopped working again?!

 

[cornholio]

How old are the captops?

 

[Mahmood]

How old are the captops?

15 month old, but I tried swap Captop between A & B, still same Problem in Group B Cyan

 

[cornholio]

Replace them.