CHAPTER 3 EXPOSURE SYSTEM
3-4
COPYRIGHT © 1999 CANON INC. CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
II.
SCANNER DRIVE SYSTEM
A. Controlling the Scanner Motor
1. Outline
The circuit shown in Figure 3-201 is the circuit used to control the scanner motor (PM15), and
has the following functions.
1.
Controlling the direction of rotation of the scanner motor.
2.
Controlling the direction of rotation of the scanner motor.
The scanner motor changes its direction of rotation when moving the scanner forward and in
reverse, and changes its speed according to the selected reproduction ratio.
When moving the scanner in reverse, the speed of rotation remains constant regardless of the
selected reproduction ratio. To accommodate the sheet-to-sheet distance needed when retaining
two sheets of paper on the transfer drum, the scanner is moved in reverse at a high speed (about ten
times as fast as when it is moved forward in Direct).
Volume 4>Chapter 3>I-D “Original Scanner Motor”
Figure 3-201
CPU PCB
R-
CPU
J2003
J602
CPU
IC8
+40V
+8V
Scanner motor driver PCB
Voltage switching
HOLD-OFF
A~E
A*~E*
Current level
setting
Drive voltage
switching
circuit
Motor
drive
circuit
Constant
current
control
circuit
Current
detection
Scanner motor
(PM15)
Содержание CLC 1120
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