JV3-130SPII ink probelm

[SameDay Signs]

Cureently have a printer I picked up and it runs really nicely but when I print a solid black swatch there is a tint of yellow in it but only i'd say 10% of the time. Yet when I'm printing pictures or whatever else it is unbelievably great. Any ideas what it could be

Thanks
Scott

 

[tbaker]

check how you generate a black, I'd recommend using a 4c black @ 30/30/30/100