I only print in B/W but the color toner cartridges in my MF644Cdw are problematic and leave vertical streak marks on pages even though it's printing in only B/W. I've found that if I pull each cartridge out and wipe down the roller part with a paper towel it will fix the problem temporarily. After printing a few pages the streak marks make a comeback.
Can I setup the printer to print without the CMY cartridges installed? Thank you!