Laser Exposure System; Overview - Canon imageRUNNER ADVANCE C255 Series Service Manual

2. Technology

Laser Exposure System

Overview

The laser exposure system forms a static latent image on the Photosensitive Drum by laser exposure.
The Laser Scanner Unit consists of the Laser Assembly and the Scanner Motor, and is controlled by the signal input from the DC
Controller PCB.
The machine uses the 2-beam method that enables exposure of 2 beams per scanning direction, and adopts the 1-polygon, 4-
laser method to realize a compact size.
Photosensitive Drum
Y/M/C/K Laser Assembly
Polygon Mirror
Scanner Motor Assembly
DC Controller PCB (UN04)
Main Controller PCB (UN81)
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