Exposing - OKIDATA OF1000 Service Manual

2.5.05 Exposing

The image drum has four layers.
· Carrier Transfer Layer (CTL)
· Carrier Generation Layer (CGL)
· Underlayer (UL)
· Aluminum Base
The CTL and CGL make up the organic photo conductor layer (OPC), which is about 20 micrometers (m
m) thick.
When 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. The negative carriers flow into the aluminum layer (ground).
The positive carriers moved to the CTL combine with the negative charges on the image surface
Service Guide OF1000
Chapter 2 Principles of Operation
Page: 53