Laser Control System; Overview; Controls - Canon MF720 Series Service Manual

Laser Control System

Overview

The Laser Scanner system is to form a static latent image on the photosensitive drum based on the video signal sent from the
Main Controller.
The Laser Scanner Unit is composed of the laser driver, the Scanner Motor Unit and other components, which are controlled
based on signals input by the DC Controller.
The figure below shows the Laser Scanner Unit schematically.

Controls

■ Failure detection
1. Scanner Motor failures
• The rotation does not reach the pre-defined value after a certain time elapsed from the Scanner Motor actuated.
• The rotation failed to meet the tolerable range consecutively within a certain time during the Scanner Motor in drive.
Error Code: E110-0000
2. BD failures
• When out-of-range BD cycle is detected during printing.
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2. Technical Explanation