first thing is first did you clean out the filter in the bypass section? The reason i asked is the heat builds up and messes with your fuser,drum,dv unit. The dv unit will get hot and melt the toner on to the cleaning blade and build up and cause the dv unit to put a very thin layer on it and will cause light prints. Just get a piece of paper and place on the cleaning blade turn the roller the backwards till the paper goes in. When the paper is inside move it from side to side until clear. If the paper gets stuck reverse the roller again and try again. This should get it done if this is the issue. as far as cleaning the roller if it has lines use just a green cleaning pad and wipe with dry cloth.
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