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COPYRIGHT
©
1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CONTENTS

CHAPTER 1 GENERAL DESCRIPTION

I. FEATURES................................................ 1-1
II. SPECIFICATIONS..................................... 1-2
A. Copier.................................................. 1-2
B. Cassette Feeding Module-B2/
Cassette Feeding Module-A2/Cassette
Feeding Unit-K1 ..................................1-5
C. Paper Deck Pedestal-K1.....................1-6
III. NAMES OF PARTS ...................................1-7
A. Exterior................................................ 1-7
B. Cross Section...................................... 1-8
IV. BASIC OPERATION................................ 1-13
A. Control Panel.....................................1-13
B. Making Copies...................................1-16
C. Using the Stack Bypass.................... 1-17
D. User Mode.........................................1-19
V. WARNINGS AND ACTIONS................... 1-26
A. Jam Indicator..................................... 1-26
B. Cleaning the Static Charge
Eliminator........................................... 1-33
VI. ROUTINE CLEANING .............................1-34
I. IMAGE FORMATION ................................2-1
A. Outline................................................. 2-1
B. Latent Static Image Formation Block.... 2-2
C. Step 1 (pre-exposure)......................... 2-3
D. Step 2 (primary charging)....................2-3
E. Step 3 (image exposure)..................... 2-4
F. Step 4 (development).......................... 2-4
G. Step 5 (transfer).................................. 2-5
H. Step 6 (separation)..............................2-6
I. Step 7 (fixing) ......................................2-7
J. Step 8 (drum cleaning) ........................2-7
II. AUXILIARY PROCESS .............................2-8
A. Blank Exposure................................... 2-8

CHAPTER 2 COPYING PROCESS

CHAPTER 3 OPERATIONS AND TIMING

I. BASIC OPERATIONS ...............................3-1
A. Functional Construction.......................3-1
B. Outline of Electrical Circuitry............... 3-2
C. Inputs to the DC Controller..................3-3
D. Outputs from the DC Controller...........3-8
E. Inputs to and Outputs from the Cassette
Feeding Module-B2 Driver PCB........ 3-13
F. Inputs to and Outputs from the Cassette
Feeding Module-A2 Driver PCB........ 3-14
G. Inputs to and Outputs from the Cassette
Feeding Unit-K1 Driver PCB .............3-16
H. Main Motor Control Circuit.................3-21
I. Basic Sequence of Operations
(2 copies, continuous, AE) ................3-22
J. Original Size Detecton Control .......... 3-23
II. EXPOSURE SYSTEM............................. 3-27
A. Varying the Reproduction Ratio........ 3-27
B. Lens Drive System............................ 3-27
C. Scanner Drive System.......................3-31
D. Operations of the Scanner in Page
Separation Mode ............................... 3-34
III. IMAGE FORMATION SYSTEM .............. 3-35
A. Outline............................................... 3-35
B. Sequence of Operations
(image formation system).................. 3-36
C. Controlling the Scanning Lamp......... 3-37
D. Controlling the Primary Charging
Roller ................................................. 3-38
E. Controlling the Transfer Roller Bias.... 3-41
F. Controlling the Static Eliminator
Bias.................................................... 3-44
G. Controlling the Developing Bias........3-46
H. Copy Density Automatic Control....... 3-48
I. Developing/Cleaning Assembly ........3-50
J. Blank Exposure Control..................... 3-53
K. Primary Charging Roller Cleaning
Control ............................................... 3-55
L. Transfer Roller Locking/Releasing
Control ............................................... 3-56
IV. PICK-UP/FEEDING SYSTEM .................3-57
A. Pick-Up from the Machine................. 3-57
B. Making Two-Sided Copies (1copy)... 3-61