Controlling The Intensity Of Laser Light; Apc Control; Controlling The Laser Scanner Motor; Controlling The Laser Shutter - Canon iR3570 Service Manual

The BD sensor of the BD PCB receives light from laser A only, and is free of light from laser B, i.e., the BD signal is generated based on the light from laser A.

6.3.2 Controlling the Intensity of Laser Light

6.3.2.1 APC Control

iR2270 / iR2870 / iR3570 / iR4570 / iR2230 / / / iR3530 /
The laser light hitting the photodiode included in the laserdiode is monitored and is controlled so that it remains a specific level at all times.

6.3.3 Controlling the Laser Scanner Motor

6.3.3.1 Controlling the Laser Scanner Motor
iR2270 / iR2870 / iR3570 / iR4570 / iR2230 / / / iR3530 /
The laser scanner motor is controlled with reference to the laser scanner motor revolution signal (FG signal).
The revolution of the laser scanner motor is controlled by means of the acceleration signal (ACC signal) and the deceleration signal (DEC signal).

6.3.4 Controlling the Laser Shutter

6.3.4.1 Controlling the Laser Shutter
iR2270 / iR2870 / iR3570 / iR4570 / iR2230 / / / iR3530 /
When the right door is opened, the laser shutter link operating in conjunction with the cover causes the laser shutter to move down, thus blocking the path of the
laser light. If the machine identifies the front cover or the right door as having been opened, it will turn off the laser scanner motor and the laser output.
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DC-CON
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Chapter 6
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