Oki 4M - Manual (Page 28)

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(3) Charging
Charging is performed by applying DC voltage to the charge roller that is in contact with the
surface of the OPC drum.
Charge roller
OPC drum
LED head
LED head
Paper
OPC drum
(4) Exposure
Light emitted from the LED head irradiates the negatively charged surface of the OPC drum.
The surface potential of the irradiated surface attenuates to form the electrostatic latent
image corresponding to the image signal.
OPC drum
High-
voltage
power
supply
High-
voltage
power
supply
Charge roller