Canon Image Reader-A1 iR5000i Service Manual page 182

CONTENTS
CHAPTER 4 IMAGE FORMATION SYSTEM
1. Outline of Processes ....................... 4-1P
1.1 Outline ..................................... 4-1P
1.2 Basic Sequence of Operations (im-
age formation system) .............. 4-3P
2. Potential Control ............................ 4-5P
2.1 Outline ..................................... 4-5P
2.1.1 Controlling Potential for Print-
ing/Copying ....................... 4-6P
2.2 Determining Primary
Current ................................... 4-11P
2.3 Determining the Laser
Output .................................... 4-12P
2.4 Determining the
Developing Bias ..................... 4-13P
2.5 APC Correction ...................... 4-14P
2.6 Density Adjustment in
Each Mode ............................. 4-16P
2.6.1 Density Adjustment
During Copying ............... 4-16P
2.6.2 Density Adjustment
During Printing ................ 4-17P
3. Controlling Charging .................... 4-18P
3.1 Controlling Pre-Exposure
LED ........................................ 4-18P
3.1.1 Outline ............................. 4-18P
3.2 Controlling Primary
Charging ................................. 4-19P
3.2.1 Outline ............................. 4-19P
3.2.2 Primary Charging Assembly
Cleaning Mechanism ....... 4-20P
3.2.3 Others .............................. 4-21P
3.3 Dust-Collecting Roller Bias ... 4-22P
3.3.1 Outline ............................. 4-22P
3.4 Controlling the Pre-Transfer
Charging ................................. 4-23P
3.4.1 Outline ............................. 4-23P
3.4.2 Controlling the Output to Suit
the Environment
(fuzzy control) .................. 4-24P
3.4.3 Cleaning Mechanism for the
Pre-Transfer Charging
Assembly ......................... 4-25P
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3.4.4 Others .............................. 4-26P
3.5 Controlling Transfer
Charging ................................. 4-27P
3.5.1 Outline ............................. 4-27P
3.5.2 Controlling the Output
to Suit the Environment
(fuzzy control) .................. 4-28P
3.5.3 Cleaning Mechanism
for the Transfer Charging
Assembly ......................... 4-29P
3.5.4 Others .............................. 4-30P
3.6 Controlling Separation
Charging ................................. 4-32P
3.6.1 Outline ............................. 4-32P
3.6.2 Correcting the Output to Suit the
Environment and the Density of
the Original Used ............. 4-34P
3.6.3 Others .............................. 4-35P
4. Hopper/Developing Assembly ..... 4-36P
4.1 Outline ................................... 4-36P
4.2 Controlling the Drive to the Hop-
per/Developing Assembly ...... 4-37P
4.3 Controlling the Developing
Bias ........................................ 4-39P
4.4 Detecting the Level of Toner
and Controlling the Supply
of Toner .................................. 4-41P
4.4.1 Sequence of Operations
(toner supply) ................... 4-42P
5. Drum Cleaner Unit ....................... 4-43P
5.1 Outline .................................... 4-43P
5.2 Detecting the Waste Toner ...... 4-44P
6. Controlling the Drum Heater ........ 4-46P
6.1 Outline .................................... 4-46P
7. Disassembly and Assembly .......... 4-49P
7.1 Pre-Exposure Lamp Unit ........ 4-50P
7.1.1 Removing the Pre-Exposure
Lamp Unit ........................ 4-50P
7.2 Photosensitive Drum .............. 4-51P
7.2.1 Removing the Drum
Unit .................................. 4-51P
2000 2000 2000 2000 CANON iR5000i/iR6000i REV.0 JUNE 2001