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COPYRIGHT © 1997 CANON INC. CANON NP6218 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIMÉ AU JAPON)
vii
1. Outline ......................................4-16
2. Switching the Static Eliminator
Bias Voltage Level ....................4-17
3. Ensuring Proper Separation of
Thin Paper................................4-17
G. Controlling Blank Exposure...........4-18
1. Outline ......................................4-18
2. Blanking (Whiting) of Non-
Image Areas for Reduction.......4-19
3. Blanking (Whiting) Out the
Leading/Trailing Edges and
between Copies........................4-19
H. Controlling the Primary Corona
Roller Cleaning Mechanism ..........4-20
1. Outline ......................................4-20
2. Primary Charging Roller
Cleaning Operation ..................4-20
I. Releasing the Transfer Roller ........4-21
1. Outline ......................................4-21
II. DEVELOPING ASSEMBLY AND
CLEANING ASSEMBLY .....................4-22
A. Outline ...........................................4-22
B. Controlling the Toner Level
Detection .......................................4-23
C. Controlling the Development
Bias................................................4-25
1. Outline ......................................4-25
2. Turning On and Off the DC
Component of the Developing
Bias and Controlling the
Voltage to a Constant Level .....4-25
3. Turning On and Off the AC
Component of the
Development Bias ....................4-26
4. Controlling the Voltage Level
of the DC Component of the
Development Bias ....................4-26
D. Automatic Control of Copy
Density...........................................4-27
1. Outline ......................................4-27
2. Control Method.........................4-27
3. AE Adjustment..........................4-29
III. DISASSEMBLY AND ASSEMBLY ......4-30
A. Illumination Assembly....................4-30
1. Detaching the Scanning
Lamp/Fluorescent Lamp
Heater.......................................4-30
2. Points to Note When Attaching
the Fluorescent Lamp
Heater/Scanning Lamp.............4-32
3. Detaching the Blank Exposure
Assembly..................................4-34
4. Detaching the Blank Exposure
Lamp ........................................4-35
5. Detaching the Blank Shutter
Solenoid ...................................4-36
6. Positioning the Blank Shutter
Solenoid ...................................4-37
7. Routing the Blanking Cable......4-38
8. Positioning the Left/Right
Margin ......................................4-38
B. Drum Unit ......................................4-39
1. Detaching the Drum Unit..........4-39
2. Cleaning ...................................4-40
C. Primary Corona Assembly.............4-41
1. Detaching the Primary Corona
Assembly..................................4-41
2. Cleaning the Cleaning Pad and
the Primary Corona Roller .......4-42
3. Positioning the Solenoid for the
Primary Charging Roller...........4-43
D. Transfer Charging Assembly .........4-44
1. Detaching the Transfer Roller...4-44
2. Attaching the Drum Heater.......4-44
E. Developing System........................4-47
1. Removing the Developing
Assembly..................................4-47
2. Removing the Blade
Assembly..................................4-47
3. Removing the Developing
Cylinder Side Seal....................4-48
4. Installing the Side Seal and
the Blade Assembly..................4-51
CHAPTER 5 PICK-UP/FEEDING SYSTEM
I. PICK-UP/FEEDING SYSTEM ............5-1
A. Outline ...........................................5-1
II. PICK-UP OPERATION (COPIER)......5-3
A. Outline ...........................................5-3
B. Sequence of Operations (pick-up/
feeding assembly; A4, 2 copies)....5-4
III. PICK-UP FROM THE CASSETTE
FEEDING MODULE-A2......................5-5
A. Pick-Up Operation .........................5-5
B. Sequence of Operations
(cassette 2; A4, 2 copies)..............5-6
IV. MULTIFEEDER...................................5-7
A. Outline ...........................................5-7
B. Identifying the Size of Paper on
the Multifeeder...............................5-8
C. Sequence of Operations
(multifeeder; A4, 2 copies).............5-9
V. IDENTIFYING THE CASSETTE
SIZE....................................................5-10
VI. IDENTIFYING JAMS ..........................5-12
A. Pre-Registration Delay Jam...........5-12
B. Pre-Registration Timing Jam .........5-13