more info.. printer model for one.
clogged head. flush your lines. then do a nozzle check. there is no hard do all be all that we can tell you. get ink to your head. run a check. show a picture of what your nozzles look like. your printer is at least several years old. we have no idea what the history is of the printer or better yet the heads. you are running a 6 color machine with two heads. multiple issues can be the problem.
do you have cleaning carts?
do you have cleaning carts?