My xerox wc 7530 has a problem with black texts. I replaced the cartridge, but no succes. When I print text in colors its fine. It only affects black textes. Black grafics are OK.
When I print text with RGB 0,0,1 the printed text is OK.
See included pdf
Swap R1 and R4. Or reseat R1. Use cleaning wand under drum (orange tab on machine side) after swap/reseat.
R1-R4 are underneith your toners
Why R1 and R4 ?
I swapped the R1 with R2 but no result.
Used the cleaning thinks.
It happens when I moved the printer from one location to another.
Any other suggestions?