
COPYRIGHT © 1999 CANON INC.
CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
vii
CHAPTER 5 LASER EXPOSURE SYSTEM
I.
OPERATIONS ............................ 5-1
A.
Outline ................................... 5-1
B.
Basic Sequence of Operations
(laser exposure system) ........ 5-4
II.
GENERATING THE BD SIGNAL 5-5
A.
Outline ................................... 5-5
B.
Flow of the BD Signal ............ 5-5
III. LASER DRIVER PCB ................. 5-7
A.
Outline ................................... 5-7
B.
Controlling the Laser Activation
.............................................. 5-8
C. Controlling the Laser Intensity
............................................ 5-10
IV. Controlling the Laser Scanner Motor
................................................. 5-12
A.
Outline ................................. 5-12
V.
DISASSEMBLY/ASSEMBLY .... 5-13
A.
Laser Unit ............................ 5-14
1.
Removing the Laser Unit
....................................... 5-14
2.
After Replacing the Laser Unit
....................................... 5-15
B.
BD Unit ................................ 5-16
1.
Removing the BD Unit .... 5-16
CHAPTER 6 IMAGE FORMATION SYSTEM
I .
PROCESSES ............................. 6-1
A.
Outline ................................... 6-1
B.
Basic Sequence of Operations
(image formation) .................. 6-3
II . POTENTIAL CONTROL ............. 6-5
A.
Outline ................................... 6-5
B.
Determining the Optimum Grid
Bias ....................................... 6-8
C. Grid Bias Corrective Control .. 6-8
D. Determining the Optimum Laser
Output .................................... 6-9
E.
Laser Output Corrective control
.............................................. 6-9
F.
Determining the Optimum
Developing Bias .................. 6-10
G. Potential Control for
Transparency Mode ............ 6-11
H. Target Potential Correction in
Each Mode .......................... 6-12
1.
Adjusting the Density during
Printing (PDL input) ........ 6-13
2.
Potential Control during High
Humidity Mode ............... 6-14
3.
Density Adjustment during
Printing (scanner input) .. 6-15
III . CONTROLLING THE CHARGING
MECHANISMS ......................... 6-16
A.
Controlling the Primary Charging
Mechanism .......................... 6-16
1.
Outline ............................ 6-16
2.
Changing the Primary
Charging Level Setting ... 6-17
3.
Primary Charging Assembly
Cleaning Mechanism ...... 6-18
4.
Others ............................. 6-19
B.
Dust-Collecting Roller Bias .. 6-20
1.
Outline ............................ 6-20
C. Controlling the Pre-Transfer
Charging Mechanism .......... 6-21
1.
Outline ............................ 6-21
2.
Controlling the Output to Suit
the Environment (fuzzy
control) ........................... 6-22
3.
Pre-Transfer Charging
Assembly Cleaning
Mechanism ..................... 6-23
4.
Others ............................. 6-24
D. Controlling the Transfer Guide
Bias ..................................... 6-25
1.
Outline ............................ 6-25
2.
Controlling the Output to Suit
the Environment ............. 6-26
E.
Controlling the Transfer Charging
Mechanism .......................... 6-27
1.
Outline ............................ 6-27
2.
Controlling the Output to Suit
the Environment (fuzzy
control) ........................... 6-28
3.
Correcting the Output at the
Trailing Edge of Paper .... 6-29