Hi I am using canon mf642c/643c/644c printer at my office, as i print any document I am getting some black shade on the A4 sheet as you can see in the above picture.i tried cleaning the fixed assembly ITB from the machine but the results are same,
all other colours are printing fine but black is printing like this, and all the toners are having 60% life,
please suggest something so that i can get rid of this,
thanks you in advance.
