Oki OKIFAX 5400 Maintenance Manual page 360

DESCRIPTION OF
PRINT OPERATIONS
2) Charging
Charging is affected by applying a DC voltage to the charge roller thta is in contact with
the EP (image) drum surface.
The charge roller is composed of two layers consisting of a conductive layer and a
surface protective layer that has elasticity, in order to secure a good contact with the EP
(image) drum. When the DC voltage (-1.35 KVDC) applied from the Power Supply Unit
exceeds a threshold value, charging begins. The applied voltage is proportional to
charge potential with off set of approx. -550V.
40838301TH Rev.1
PWU
EP drum
Charge Potential
[V]
-750
B - 6
Charge roller
-550 -1350
Applied Voltage
[V]