CONTENTS
iii
COPYRIGHT © 1996 CANON INC. CANON GP215/200 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 1 GENERAL DESCRIPTION
I. FEATURES..............................................1-1
II. SPECIFICATIONS ...................................1-2
III. NAMES OF PARTS .................................1-8
A. External View ...................................1-8
B. Cross Section.................................1-10
C.
Arrangement of Extension Boards ....
1-12
IV. OPERATION..........................................1-13
A. Turning On the Power Switches.....1-13
B. Control Panel..................................1-14
C. Basic Operation..............................1-16
D. Extension Mode..............................1-19
E. Costom Common Settings .............1-25
V. ROUTINE WORK BY THE USER.........1-29
VI. SAFETY.................................................1-30
A. Laser Beams ..................................1-30
B. Safety of Toner ...............................1-31
CHAPTER 2 COPYING PROCESS
I. IMAGE FORMATION...............................2-1
A. Outline ..............................................2-1
B. Latent Image Formation Block .........2-2
C. Pre-Exposure (step 1)......................2-3
D. Primary Charging (step 2)................2-3
E. Laser Exposure (step 3)...................2-4
F. Development (step 4).......................2-4
G. Transfer (step 5) ...............................2-5
H. Separation (step 6)...........................2-6
I. Fixing (step 7)...................................2-7
J. Dram Cleaning .................................2-7
II. AUXILIARY PROCESS............................2-8
CHAPTER 3 OPERATIONS AND TIMING
I. BASIC OPERATION................................3-1
A. Functional Construction....................3-1
B. Outline of the Electrical Circuitry......3-2
C. Inputs to the Major PCBs.................3-6
D. Main Motor Control PCB ................3-16
II. ORIGINAL EXPOSURE SYSTEM.........3-20
A. Outline ............................................3-20
B. Varying the Reproduction Ratio .....3-22
C. Sequence of Operations
(original exposure system) .............3-22
D. Scanner Motor................................3-23
E. Controlling the Scanning Lamp......3-24
F. Identifying the Size of Originals......3-26
III. IMAGE PROCESSING..........................3-29
A. Outline ............................................3-29
B. Analog Image Processing ..............3-31
C. Digital Image Processing................3-33
IV. LASER EXPOSURE SYSTEM..............3-51
A. Laser Processing Assembly...........3-51
B. Generating the BD Signal ..............3-53
C. Laser Driver Circuit.........................3-54
D.
Controlling the Laser Scanner Motor
...3-56
V. IMAGE FORMATION SYSTEM.............3-58
A.
High-Voltage Transformer Circuit
......3-58
B. Controlling the
Primary Charging Roller Bias.........3-60
C. Controlling the
Transfer Charging Roller Bias ........3-63
D. Controlling the Developing Bias .....3-66
E. Controlling the
Separation Static Eliminator Bias...3-68
F.
Controlling the
Transfer Guide/Fixing Roller Bias
...3-69
G. Developing Assembly/ Drum Cleaner...3-70
H. Primary Charging Roller
Cleaning Mechanism......................3-73
I. Detecing Errors on the
Composite Power Supply PCB.......3-74
VI. PICK-UP/FEEDING SYSTEM ...............3-76
A. Outline ............................................3-76
B. Pick-Up from the Cassette .............3-79
C.
Non-Pick Up Operation (standby)
....3-91
D.
Detecting the Level of Copy Paper
...3-93
E.
Detecting the Size of Copy Paper
...3-95
F. Multifeeder....................................3-100
G. Controlling the
Registration Roller Clutch.............3-103
H. Making Overlay Copies ................3-104
I. Making Two-Sided Copies............3-106
J. Lower Feeding Assembly .............3-108
K. Fixing/Delivery Assembly .............3-118
L. Delivery Assembly........................3-127
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