Oki OKIFAX 5950 Series Maintenance Manual page 497

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.
Charge roller
PWU
EP drum
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 (-1.30KV 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.
Charge Potential
[V]
-800
-550 -1300 [V]
Applied Voltage
OF5750/5950 Series January 2001 B - 5