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
