It's a fairly new machine, that got problems after 250gsm card was put through it that it couldn't handle, the toner would scatter and come off, though the specs are up to 256gsm for this printer. It now has these streaks on black only, color prints are fine. I've changed the toner, the drum unit, the developer unit, checked the transfer belt, adjusted the 2nd BTR, cleaned the fuser, but it hasn't fixed anything. Any thoughts on what to try?greyscale photo.jpg100K.jpg