Mimaki UJF 6042 MKII - Yellow Fading Issues

[Guilherme P]

Hey guys!

We're having issues on our Mimaki UJF 6042 MKII where the yellow channel is fading after a couple centimeteres printed as you guys can see from the image attached.
The test print seems fine, I couldn't find any missing nozzle.

I've also checked the head temp and indeed the temperature of the yellow channel (2A) is more than 20 degrees lower than the other heads
Head 1A = 42 C
Head 1B = 42 C
Head 2A = 17 C
Head 2B = 42 C
Head 3A = 39 C
Head 3B = 42C
Head 4A = 43C
Head 4B = 43C
Water Heater = 44 C

Any suggestion of what can I do to fix this?

 

[Smoke_Jaguar]

Could be ink valve going out causing the head to starve or might be lacking vacuum (which helps load ink quicker).