Scanner Drive System; Controlling The Scanner Motor; Outline - Canon CLC 1120 Service Manual

CHAPTER 3 EXPOSURE SYSTEM
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"
J2003
R-
CPU
CPU PCB
3-4
COPYRIGHT © 1999 CANON INC.
J602
IC8
Voltage switching
HOLD-OFF
A~E
CPU
A*~E*
Current level
setting
Scanner motor driver PCB
Figure 3-201
+40V
Drive voltage
switching
circuit
Motor
drive
circuit
Constant
current
control
Current
circuit
detection
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
+8V
Scanner motor
(PM15)