Laser Exposure System; Functional Configuration; Failure Detection - Canon imageCLASS X LBP1238 II Service Manual

Laser Exposure System

Functional Configuration

Overview
The laser exposure system forms a static latent image on the Photosensitive Drum by laser exposure.
Description
The Laser Scanner Unit consists of the Laser Unit and the Scanner Motor Unit, and is controlled by the signal input from the DC
Controller.
Shutter Control
The Laser Scanner Unit of this machine has the laser shutter mechanism.
The Laser Shutter blocks laser path of the Laser Scanner Unit when the Front Cover is opened for the safety of users and
service technicians.

Failure Detection

Overview
The DC Controller detects the following failures in the Laser Scanner Unit.
• Scanner area failure
• Scanner Motor failure
Description
Scanner area failure detection
If an error in any of the Scanner Motor, Laser Unit, or BD detection in the scanner area is detected, an error code is notified.
Main Controller PCB
DC Controller PCB
Scanner Mirror
BD Sensor
Scanner Motor Unit
Photosensitive Drum
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2. Technical Explanation (Device)
Laser Unit