Pages are heavily streaked in black and sometimes also covered in yellow - Event log Shows - Engine cycle 78920 Event 54.0C.00 Halftone calibration error and 54.0C01 Halftone calibration error and 54.0C.02 Halftone calibration error and 54.0C.03 Halttone calibration error.
Cartridges - black - new Yellow 30 - 40 % Blue is new and Red is new
not sure what the issue is - how to diagnose or resolve. a PDF of pages is attached
Any help would be appreciated