Oki OKIFAX 5950 Series Maintenance Manual page 456

R76-
(2) Charging
Charging is actuated by appliciation of the DC voltage to the charge roller thta is in
contact with the image drum surface.
Charge roller
Power
supply
Image drum
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.
charge potential
[V]
-750
-550 -1300 [V]
applied voltage
OF5750/5950 Series January 2001 A3 - 28