원문 게시자: david chase ,
Seems like may its the only black cartridge which is malfunctioning. However you can attempt to fix it before replacing with the new one. Take your black cartridge out first and try to touch the head on a doubled tissue paper you should see a thick black line if not then keep gently pressing the head over tissue for 4-5 times and you should stop when you see a thick line on it. Hopefully this shall fix your jammed head.