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III. SCANNING DRIVE SYSTEM
A. Driving the Scanner
1. Outline
The scanner drive system is driven by the scanner motor (M2). The scanner motor
changes the direction of its rotation between when the scanner moves forward and when
it moves in reverse; the speed of its rotation varies according to the selected
reproduction ratio. However, the speed of its rotation remains constant regardless of the
reproduction ratio when the scanner is moving in reverse; 2. 5 times as fast as when the
scanner is moving forward.
The distance traveled by the scanner varies according to the length of copy paper
and the selected reproduction ratio.
Figure 3-301
COPYRIGHT
©
1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 3 EXPOSURE SYSTEM
3-5
SC-COM A
SC-COM B
SC-A
SC-A*
SC-B
SC-B*
DC controller
PCB
No. 2 mirror mount
No. 1 mirror mount
Forward
PS1 light-blocking plate
Scanner home position detection signal (SCHP)
Scanner home position sensor (PS1)