Canon iR2200 Series, Service Manual

Page: 103 / 768

COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
CHAPTER 2 ORIGINAL EXPOSURE SYSTEM
2-7 R
2.2 Controlling the Scanner Motor
The system used to control the scanner motor is constructed as follows:
The motor driver turns on/off the scanner motor and controls its direction and speed of
rotation in keeping with the signals from the CPU and motor driver controller.
F02-202-01
2.2.1 Controlling the Motor When Scanning an Image
When scanning an image, the motor is controlled as follows, thereby controlling the
movement of the No. 1 mirror base unit:
[1] Acceleration. Used to accelerate until the speed most appropriate to the read ratio is
attained.
[2] Approach run. Used to ensure that speed stabilizes.
[3] Image read. Used to read the image at a specific speed suited to the read ratio.
[4] Deceleration. Used to enable the scanner to speed down and stop promptly, starting at
the end of the image.
F02-202-02
HP Image leading edge Image end
Stream reading position
(start position)
Stop
Accelerate Maintain
Travel
speed
Travel distance
[1] [2] [3] [4]
Decelerate
Motor driver
contoroller
Scanner motor
Reader controller PCB
J401
M400
1
5
2
3
6
4
A
A*
B
B*
+24V
Motor
driver
CPU