Oki OKIFAX 5400 Maintenance Manual page 361

3) Exposure
Light emitted from the LED head irradiates the EP (image) drum surface with negative
charges. The surface potential of the irradiated part of the EP drum drops, thereby
forming an electrostatic latent image associated with the image signal.
PWU
EP drum
The EP (image) drum is coated with an underlayer (UL), a carrier generation layer (CGL),
and carrier transfer layer (CTL) on the aluminum base. The organic photo conductor
layer (OPC), comprising a CTL and a CGL, is about 20 µm thick.
40838301TH Rev.1
LED head
Charge roller
B - 7
DESCRIPTION OF
PRINT OPERATIONS
LED head
Paper
EP drum
CTL
CGL
UL
Base
20 µm
30 mm
EP drum