Scanner Drive System - Canon NP6621 Service Manual

C. Scanner Drive System
1. Outline
The scanner drive system is driven by the scanner
motor (M2). The scanner motor changes the direction
of its rotation, and its speed changes when moving
the scanner forward to suit the selected reproduction
ratio. However, its speed when moving the scanner
in reverse remains constant (2.5 times as fast as
No. 2 mirror mount
COPYRIGHT © 1998 CANON INC.
No. 1 mirror mount
Figure 3-205
CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
OPERATIONS AND TIMING
when moving the scanner forward) regardless of
the selected reproduction ratio.
The distance traveled by the scanner varies
depending on the length of the copy paper and the
selected reproduction ratio.
SCA
SCA*
SCB
SCB*
Forward
Light-blocking plate
Scanner home position detection signal (SCHP)
Scanner home position sensor (PS1)
DC controller PCB
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