Canon iR3245, Service Manual

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Contents
4.5.4
Printer unit Output Image Processing ......................................................................................................................4- 9
4.6 Flow of Image Data .................................................................................................................................. 4- 10
4.6.1
Flow of Image Data According to Copy Functions.................................................................................................4- 10
4.6.2 Flow of Image Data for the Box Function...............................................................................................................4- 10
4.6.3 Flow of Image Data for the SEND Function...........................................................................................................4- 11
4.6.4 Flow of Image Data for the Fax Transmission .......................................................................................................4- 11
4.6.5
Flow of Image Data for the Fax Reception Function..............................................................................................4- 12
4.6.6
Flow of Image Data for the PDL Function..............................................................................................................4- 12
4.7 Parts Replacement Procedure ................................................................................................................. 4- 13
4.7.1
Image PCB.............................................................................................................................................................4- 13
4.7.1.1
Removing the Image PCB ..................................................................................................................................................... 4- 13
4.7.2
Main Controller PCB ..............................................................................................................................................4- 13
4.7.2.1
Before Removing the Main Controller PCB ........................................................................................................................... 4- 13
4.7.2.2 Removing the Main Controller PCB ....................................................................................................................................... 4- 13
4.7.3 SDRAM ..................................................................................................................................................................4- 14
4.7.3.1 Removing the SDRAM (for image processing) ...................................................................................................................... 4- 14
4.7.3.2
Removing the SDRAM (for system processing) .................................................................................................................... 4- 15
4.7.4 HDD .......................................................................................................................................................................4- 15
4.7.4.1
Removing the HDD ................................................................................................................................................................ 4- 15
4.7.5 Wireless LAN PCB.................................................................................................................................................4- 15
4.7.5.1 Removing the Wireless LAN PCB.......................................................................................................................................... 4- 15
4.7.6 IPSec PCB .............................................................................................................................................................4- 16
4.7.6.1 Removing the IPSec PCB...................................................................................................................................................... 4- 16
4.7.7
PCI Bus Expansion PCB........................................................................................................................................4- 17
4.7.7.1 Before Removing the PCI Bus Expansion PCB..................................................................................................................... 4- 17
4.7.7.2
Removing the PCI Bus Expansion PCB ................................................................................................................................ 4- 17
4.7.8 Voice Guidance PCB .............................................................................................................................................4- 17
4.7.8.1 Removing the Voice Guidance PCB ...................................................................................................................................... 4- 17
4.7.9 Voice Operation PCB.............................................................................................................................................4- 18
4.7.9.1 Removing the Voice Operation PCB...................................................................................................................................... 4- 18
4.7.10 FAX Expansion PCB ............................................................................................................................................4- 19
4.7.10.1 Removing the FAX Expansion PCB..................................................................................................................................... 4- 19
Chapter 5
Original Exposure System
5.1 Construction ............................................................................................................................................... 5- 1
5.1.1
Specifications/controls/functions..............................................................................................................................5- 1
5.1.2
Major Components...................................................................................................................................................5- 2
5.1.3 Configuration of Control System ..............................................................................................................................5- 3
5.1.4 Reader Controller PCB ............................................................................................................................................5- 4
5.2
Basic Sequence ......................................................................................................................................... 5- 5
5.2.1 Basic Sequence at Power-On..................................................................................................................................5- 5
5.2.2 Basic Sequence at Start Key ON (book mode/1 original) ........................................................................................5- 5
5.2.3
Basic Sequence at Start Key ON (ADF mode/1 original).........................................................................................5- 5
5.3 Various Control........................................................................................................................................... 5- 6
5.3.1
Controlling the Scanner Drive System .....................................................................................................................5- 6
5.3.1.1
Overview .................................................................................................................................................................................. 5- 6
5.3.1.2 Scanner Motor Control............................................................................................................................................................. 5- 6
5.3.2 CCD .........................................................................................................................................................................5- 8
5.3.2.1 Overview .................................................................................................................................................................................. 5- 8
5.3.3 Enlargement/Reduction .........................................................................................................................................5- 11
5.3.3.1 Magnifications in Main Scanning Direction ............................................................................................................................ 5- 11
5.3.3.2
Magnification in Sub Scanning Direction ............................................................................................................................... 5- 11
5.3.4 Detecting the Size of Originals...............................................................................................................................5- 12
5.3.4.1 Overview ................................................................................................................................................................................ 5- 12
5.3.4.2 Control Details ....................................................................................................................................................................... 5- 12
5.3.4.3
Detection Operation Overview ............................................................................................................................................... 5- 14
5.3.5 Dirt Sensor Control ................................................................................................................................................5- 15