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Toner fragments have slipped through the cleaning web.
This may occur if:
Duplex printing
Printing on uncoated (especially rough-textured) paper
Halftone printing
Printing after halftone printing
Printing after printing on many small-size sheets
To adjust the following settings, pre-register the type of paper in use as a custom paper. For details about registering custom papers, see "Registering a Custom Paper", Paper Settings.
