Question Roland RF640 Printing yellow

[chapmachau]

Just noticed a hint of yellow running through a print, ran a test and the black is distorted with yellow being dragged through shown in first photo. Just changed the wiper and its better but still with the yellow through the print on second photo. I have not changed the felt yet, just ordered one.

Be grateful for some advice, thank you.

 

[Vinyl slayer]

I don't have this machine, but I have to say, my day was totally F'd up with the color yellow. Two machines, issues with yellow ink.
Today was messed up and unproductive because of the color yellow. Sorry this isn't helpful, just had to rant.
I wish you good luck with your problem

 

[balstestrat]

How's the cap-top doing? I'd change that if it has not been changed in a while.