Here is the problem - We are getting a yellow smudge down the left side of every page we print. The drum for the yellow is especially encrusted with toner on the left side - the culprit I suppose. The Magenta has a string of toner encrusted on it as well. It's a new Brother Multifunction printer MFC-9970CDW. We returned one to Staples already as three or four of the drums were gummed up on it. Is it possible to clean these drums ourselves?
We did the simple routine slider swipe that is built in but that must be for dust. Sometimes we print 100 prints off at a time? Maybe the unit is getting too hot that this is happening? My thought is that for our purposes we are giving the printer a work out. We print two monthly bulletins (300 pages perhaps maximum). What do you advise?