Canon NP7160 Service Manual page 55

EXPOSURE SYSTEM
This chapter discusses the principles of operation used for the copier's lens drive unit and scanner drive
unit. It also explains the timing at which these drive units are operated, and shows how they may be
disassembled/assembled and adjusted.
I. OUTLINE OF OPERATION ..................... 3-1
A. Changing the Reproduction Ratio ...... 3-1
II. LENS DRIVE SYSTEM ............................ 3-3
A. Driving the Lens ................................. 3-3
III. SCANNER DRIVE SYSTEM .................... 3-6
A. Outline ................................................ 3-6
B. Scanner Motor Control Circuit ........... 3-7
C. Relationship between Scanner Sensor
and Signals ......................................... 3-7
COPYRIGHT © 1998 CANON INC.
CHAPTER 3
CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
D. Basic Sequence of Operations
(scanner) ........................................... 3-8
E. Scanner Movement in
Page Separation Mode ...................... 3-9
IV. OTHERS ................................................. 3-10
A. Detecting the Original Size .............. 3-10
V. DISASSEMBLY/ASSEMBLY ................. 3-11
A. Scanner Drive Assembly .................. 3-12
B. Lens Drive Assembly ....................... 3-18