I have a Canon mf644cdw. Black font is printing as gray. This happens whether I am printing from my computer or making a copy from the platen glass. The problem began with a large column on the page printing lighter, but now it affects all of the black ink. The color ink looks good. I have removed and replaced all of the cartridges, cleaned the fixing assembly, and cleaned the ITB. The status monitor shows the black cartridge level at 30%.
I would greatly appreciate some help.
