Oki OKIFAX4550 Maintenance Manual page 374

(3) Charging
Charging is performed by applying DC voltage to the charge roller that is in contact with the
surface of the 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.
High-
voltage
power
supply
OPC drum
41309401TH Rev.4
High-
voltage
power
supply
LED head
Charge roller
Charge roller
Charge roller
Paper
LED head
OPC drum
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