Does anyone have ideas for what would prevent a laser printer from printing black (even after the black toner cartridge has been replaced), even though the printer can print colors fine (even approximating black by adding the CYM colors together) and even though the Clean Fixing Unit process produces a page with good dark black stripes on it?
My assumption is that the problem has less to do with the black toner and more to do with the way the printer is processing black images.
I've got a printer that is useless because it can't print black text.