Reverse Side of Paper is Smudged
Have you loaded paper that is smaller than the size of the print data?
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Check to make sure that the paper size matches the size of the print data.
Have you cleaned the fixing unit?
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Clean the fixing unit.
Cleaning the Fixing Assembly(P. 583)
Do smudges appear on 2-sided printed paper? (MF634Cdw / MF632Cdw)
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When performing 2-sided printing, the image may be blurry on the back side of paper in the trailing edge.
Setting <Correct Blurry Image> to <On> may solve the problem.
<Correct Blurry Image>(P. 479)
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If you set to <On>, the printing speed may be slower.
Troubleshooting
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