Canon PC920 Service Manual page 49

EXPOSURE SYSTEM
This chapter discusses the principles of operation used for the machine'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/assmbled and adjusted.
I. OPERATIONS ..............................3-1
A. Outline ...................................3-1
B. Varying the Reproduction
Ratio ......................................3-2
C. Lens Drive System ................3-3
D. Scanner Drive System ..........3-4
II. EXPOSURE SYSTEM .................3-9
COPYRIGHT © 1999 CANON INC.
CHAPTER 3
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
A. Controlling the Scanning
Lamp .....................................3-9
III. DISASSEMBLY/ASSEMBLY ..... 3-12
A. Scanner Drive Assembly .... 3-13
B. Lens Drive Assembly ......... 3-31
C. Exposure System ............... 3-37