Oki OKIPAGE 14EX Service Manual page 46

forming an electrostatic latent image associated with the image signal.
The image drum is coated with an underlayer (UL), a carrier generation layer (CGL), and carrier transfer layer (CTL) on aluminum base. The organic photo
conductor layer (OPC), comprising CTL and CGL, is about 20 mm thick.
The image roller surface is charged to about -750 V by the contact charge of the charge roller.
When the light from the LED head irradiates the image drum surface, the light energy generates positive and negative carriers in the CGL. The positive carriers
are moved to the CTL by an electrical field acting on the image drum. Likewise, the negative carriers flow into the aluminum layer (ground).