Table Of Contents - Canon NP6621 Service Manual

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
CHAPTER 2 COPYING PROCESS
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
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
COPYRIGHT © 1998 CANON INC.
CONTENTS
CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
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
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
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
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