I have a Brother MFC-J700D. Lost track of when it was bought --- at least six years ago.
Recently the print quality keeps getting worse. Colors are getting much muddier. (I wanted to post a link to a photo, but I'm new here and it won't let me most links yet.)
I tried running the "clean" function of the printer, but it doesn't help. Is the only recourse to replace the printer, or is there something that can be done to get it back to its former quality?