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Just replaced the color PCU, and the printer still is leaving black marks on the pages. Should I also replace the black PCU even it doesn't say to on the control panel?
The control panel indication to change the PCU is controlled by count, not by the machine recognizing a problem with the unit. Replacing the black PCU would probably be your next step to resolving your problem, although there are other things that could be causing your copy quality issues. If that does not work you may have to call your local service rep.
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