Are you using the machine in an environment with high humidity?
(MF735Cdw / MF733Cdw / MF731Cdw)
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Setting <Reduce Toner Fixing Stain 2> to <Mode 1> may solve the problem.
<Reduce Toner Fixing Stain 2>(P. 481)
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If you set to <Mode 1>, printouts may be faded.
Troubleshooting
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