Oki OKIPAGE 14ex Maintenance Manual page 29

(2) Charging
Charging is actuated by the application of the DC voltage to the charge roller that is in contact with
the image drum surface.
The charge roller is composed of two layers, a conductive layer and a surface protective layer, both
having elasticity to secure good contact with the image drum. When the DC voltage applied by the
power supply exceeds the threshold value, charging begins. The applied voltage is proportional to
the charge potential, with offset of approximately –550V.
41356901TH Rev.2
(Sub-CH)
Power (CH)
supply
charge potential
[V]
-750
-550
Sub-charge roller
Charge roller
Image drum
-1300 [V]
applied voltage
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