Scanner Drive System; Outline - Canon NP7160 Service Manual

CHAPTER 3 EXPOSURE SYSTEM
III. SCANNER DRIVE SYSTEM
A. Outline
The scanner is driven by the scanner motor (M2)
As shown in Figure 3-301, when the scanner motor rotates in reverse direction, the scanner
moves forward by the drive coming through the gears, drive belt, and cable. The scanner motor is
rotated in the opposite direction to move the scanner in reverse.
The speed of rotation of the scanner motor when the scanner is moved forward is varied
according to the selected reproduction ratio. The speed when the scanner is moved in reverse,
however, is the same regardless of the selected reproduction ratio—it is about 2.5 times the speed
used in Direct when the scanner is moved forward.
The distance over which the scanner is moved varies according to the length of copy paper
and the selected reproduction ratio.
Scanner home
position sensor
(PS1)
3–6
COPYRIGHT © 1998 CANON INC.
DC controller PCB
Scanner
motor (M2)
CW
CCW
Figure 3-301
Foward
Reverse
CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)