Oki 6E - Manual (Page 38)

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Note: The bias voltage required during the developing process is supplied to the toner supply roller and
the developing roller, as shown in the diagram below. –450 VDC is supplied to the toner supply
roller, –300 VDC to the developing roller.
Connected and bias supplied
when the cover
is closed
Image drum
Base
Developing roller
Toner supply roller