Canon NP6218, FY8-13EX-000 service manual III. Scanning Drive System, Driving the Scanner

CHAPTER 3 EXPOSURE SYSTEM

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.

SC-COM A

SC-COM B

SC-A

SC-A*

SC-B

SC-B*

No. 1 mirror mount

DC controller

PCB

Forward

No. 2 mirror mount	PS1 light-blocking plate
	Scanner home position detection signal (SCHP)
	Scanner home position sensor (PS1)

Figure 3-301

COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-5