Chapter 3 Original Exposure System - Canon ImageRunner 600 Service Manual

ORIGINAL EXPOSURE SYSTEM
This chapter provides descriptions on the operations and the functions of the
scanner drive mechanism and the original detection mechanism, relationship
between electrical and mechanical systems, and timing at which each associated
part is turned on.
I. OPERATIONS ............................ 3-1
A. Outline ................................... 3-1
B. Basic Sequence of Operations
.............................................. 3-3
C. Changing the Reproduction Ratio
.............................................. 3-4
II. SCANNER DRIVE SYSTEM ...... 3-5
A. Outline ................................... 3-5
B. Controlling the Scanner Motor
.............................................. 3-6
III. CONTROLLING THE SCANNING
LAMP .......................................... 3-8
A. Outline ................................... 3-8
B. Controlling the Temperature by a
Fluorescent Lamp Heater .... 3-10
COPYRIGHT © 1999 CANON INC.
CHAPTER 3
CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
C. Controlling Pre-Heat Voltage
............................................ 3-10
D. Initial Activation ................... 3-11
E. Detecting an Error ............... 3-12
IV. DETECTING THE ORIGINAL SIZE
................................................. 3-14
A. Outline ................................. 3-14
B. Detection by Original Sensors
............................................ 3-14
C. Detection by the Feeder ...... 3-14
V. DISASSEMBLY/ASSEMBLY .... 3-15
A. No. 1 Mirror Mount .............. 3-16
B. Scanner Drive Assembly ..... 3-20
C. PCBs ................................... 3-28
D. Others .................................. 3-31