Oki OKIFAX 5750 Service Manual page 867

(8) Cleaning of Rollers
The charge, transfer and cleaning rollers are cleaned for the following cases:
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Warning up when the power is turned on.
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Warning up after the opening and closing of the cover.
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When the number of sheets accumulated reaches 10 or more, and the printout operation ends.
Changes in bias voltage applied to each roller move attaching toner off the roller to the image drum and return it to the developer.
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