Mfc 6490cw print is lightly black so print is not good whot is probalem

Black is very difficult for an ink jet printer. If you are using the wrong paper, it even is more difficult. Please use paper made for ink jet printers, because the paper can absorb the fluid better so the pigment is more visible. There are also different ink's you can buy, but please if it really should be black, only use the brand own ink. Not a cheaper version. Professional printers even use different blacks for photo paper and for matte paper (and ink jet paper). Just to microbe how difficult it is to get real dark black on different media.