Scanner Drive System; Outline - Canon NP6412 Service Manual

CHAPTER 3 EXPOSURE SYSTEM
D.

Scanner Drive System

1.

Outline

The scanner is driven by the scanner/lens drive motor (M2), whose direction of rotation
changes to move the scanner forward or in reverse.
When moving the scanner forward, the speed of rotation of the motor varies according to the
selected reproduction ratio on a continuous basis; when moving the scanner in reverse, on the other
hand, its speed remains the same regardless of the selected reproduction ratio in normal copying
(312mm/sec, about 3.3 as fast as when moving the scanner forward in Direct).
The distance over which the scanner is moved varies according to the length of copy paper and
the selected reproduction ratio.
The scanner/lens drive motor dives the lens drive system as well as the scanner.
3-4
COPYRIGHT © 1999 CANON INC.
M2
Scanner home position signal (SCHP)
Scanner home position sensor(PS1)
Figure 3-104
CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
PS1 Light-blocking
plate
Motor driver circuit
DC controller PCB
Q109