I have an Epson SureColor P10000 that was working fine up until about a week ago when the PK channel suddenly stopped printing consistently. When running a nozzle check, PK prints partially or not at all, and MK comes back clean. Running a print with photo black produces severe banding, and prints using matte black come back with streaking similar to that of ink starvation.
I ran a nozzle check and PK was completely blank. After running a power cleaning on PK/MK, both come back with a filled nozzle check pattern however there is no improvement when sending actual prints through. I ran a test print using PK by sending just a black square to be printed, which printed fine for the first inch of the print and then turned into banding/only gray ink for the remainder of the page. I ran a nozzle check and PK was blank again.
Is this a pump issue? Any help would be wonderful!