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COPYRIGHT © 1997 CANON INC. CANON NP6218 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIMÉ AU JAPON)
vi
I. PROCESSES .....................................4-1
A. Outline ...........................................4-1
B. Basic Sequence of Operations
(image formation system)..............4-3
C. Controlling the Scanning Lamp .....4-4
1. Outline ......................................4-4
2. Turning On and Off the
Scanning Lamp ........................4-5
3. Pre-Heating Control
(scanning lamp)........................4-5
4. Sequence of Operations
(scanning lamp pre-heating
control; AE, A4, continuous,
2 copies)...................................4-5
5. Controlling the Intensity of the
Scanning Lamp (FL1)...............4-7
6. Controlling the Fluorescent
Lamp Heater.............................4-8
7. Fluorescent Lamp Automatic ...4-9
8. Fluorescent Lamp Protection
Mechanism ...............................4-9
D. Controlling the Primary Charging
Roller Bias .....................................4-10
1. Outline ......................................4-10
2. Turning On and Off the Primary
Charging Roller Bias ................4-11
3. Controlling the Primary
Charging Roller Bias to a
Constant Voltage ......................4-11
4. Switching the Primary Charging
Roller Bias Application Voltage
Level .........................................4-11
5. Application Voltage Level
(APVC) for the Primary
Charging Roller and Scanning
Lamp On Voltage Level
Automatic Correction................4-12
E. Controlling the Transfer Roller Bias...4-13
1. Outline ......................................4-13
2. Turning On and Off the
Transfer Roller Bias ..................4-15
3. Controlling the Transfer Bias
to a Constant Voltage ...............4-15
4. Controlling the Transfer Bias
Voltage Level Correction
(ATVC control)..........................4-15
5. Current Limiter Circuit
(transfer bias) ...........................4-15
6. Current Limiter Circuit
(cleaning bias)..........................4-15
F. Controlling the Static Eliminator
Bias................................................4-16
CHAPTER 4 IMAGE FORMATION SYSTEM
CHAPTER 3 EXPOSURE SYSTEM
I. BASIC OPERATION...........................3-1
A. Varying the Reproduction Ratio ....3-1
II. LENS DRIVE SYSTEM ......................3-1
A. Outline ...........................................3-1
B. Lens Motor Drive Circuit................3-3
1. Keeping the Lens Motor
Stationary .................................3-3
2. Driving the Lens Motor.............3-3
C. Basic Sequence of Operations
(lens drive system; non-Direct)......3-4
III. SCANNING DRIVE SYSTEM.............3-5
A. Driving the Scanner.......................3-5
1. Outline ......................................3-5
2. Relationship between the
Scanner Sensor and Signals....3-6
3. Basic Sequence of
Operations (scanner)................3-6
4. Driving the Scanner Motor .......3-7
5. Scanner Operations in Page
Separation Mode (non-AE,
page separation, A4, 2 copies)..3-8
IV. DISASSEMBLY AND ASSEMBLY ......3-9
A. Scanner Drive Assembly ...............3-9
1. Detaching the Scanner Drive
Motor ........................................3-9
2. Detaching the Scanner Cable ..3-10
3. Assembling the Mirror
Position Tool .............................3-12
4. Routing the Scanner Cable......3-13
5. Adjusting the Position of the
Mirrors (optical length of No.
1, 2, and 3 mirrors)...................3-16
6. Cleaning the Scanner No. 6
Mirror ........................................3-17
B. Lens Drive Assembly.....................3-18
1. Detaching the Lens Drive
Motor ........................................3-18
2. Routing the Lens Cable............3-20
3. Adjusting the Position of the
Change Solenoid......................3-21