Oki B4100 - Manual (Page 526)

40055101TH Rev.4 526 /
Charge roller
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.
PWU
EP drum
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 Potential
Applied Voltage
-1350 -550 [V]
[V]
-750