Canon iR6570 series Service Manual Download

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Contents

4.2

Construction of the Electrical Circuitry........................................................................................................4- 2

4.2.1

Main Controller PCB................................................................................................................................................ 4- 2

4.2.2

HDD......................................................................................................................................................................... 4- 2

4.3

Start-Up Sequence .....................................................................................................................................4- 5

4.3.1

Overview.................................................................................................................................................................. 4- 5

4.3.2

Start-Up Sequence .................................................................................................................................................. 4- 5

4.4

Shut-Down Sequence.................................................................................................................................4- 8

4.4.1

Overview.................................................................................................................................................................. 4- 8

4.4.2

Flow of Operation .................................................................................................................................................... 4- 8

4.5

Image Processing .......................................................................................................................................4- 9

4.5.1

Overview of the Image Flow .................................................................................................................................... 4- 9

4.5.2

Construction of the Image Processing Module........................................................................................................ 4- 9

4.5.3

Reader Unit Input Image Processing..................................................................................................................... 4- 10

4.5.4

Compression/ Extension/ Editing Block................................................................................................................ 4- 11

4.5.5

Printer unit Output Image Processing.................................................................................................................... 4- 11

4.6

Flow of Image Data ..................................................................................................................................4- 12

4.6.1

Flow of Image Data According to Copy Functions ................................................................................................ 4- 12

4.6.2

Flow of Image Data for the Box Function .............................................................................................................. 4- 12

4.6.3

Flow of Image Data for the SEND Function .......................................................................................................... 4- 13

4.6.4

Flow of Image Data for the Fax Transmission....................................................................................................... 4- 13

4.6.5

Flow of Image Data for the Fax Reception Function ............................................................................................. 4- 14

4.6.6

Flow of Image Data for the PDL Function ............................................................................................................. 4- 15

4.7

Parts Replacement Procedure .................................................................................................................4- 16

4.7.1

Main Controller Box ............................................................................................................................................... 4- 16

4.7.1.1

Removing the Rear Cover (upper)......................................................................................................................................... 4- 16

4.7.1.2

Removing the Main Controller Box ........................................................................................................................................ 4- 16

4.7.2

Main Controller PCB.............................................................................................................................................. 4- 17

4.7.2.1

Removing the Main Controller PCB ....................................................................................................................................... 4- 17

4.7.2.2

After Replacing the Main Controller PCB............................................................................................................................... 4- 18

4.7.3

SDRAM.................................................................................................................................................................. 4- 18

4.7.3.1

Removing the SDRAM........................................................................................................................................................... 4- 18

4.7.4

Boot ROM.............................................................................................................................................................. 4- 18

4.7.4.1

Removing the Boot ROM ....................................................................................................................................................... 4- 18

4.7.5

HDD....................................................................................................................................................................... 4- 19

4.7.5.1

Removing the HDD ................................................................................................................................................................ 4- 19

4.7.5.2

After Replacing the HDD........................................................................................................................................................ 4- 19

4.7.6

Controller Fan........................................................................................................................................................ 4- 19

4.7.6.1

Removing the Controller Cooling Fan.................................................................................................................................... 4- 19

Chapter 5

Original Exposure System

5.1

Construction ...............................................................................................................................................5- 1

5.1.1

Specifications, Controls, and Functions .................................................................................................................. 5- 1

5.1.2

Major Components .................................................................................................................................................. 5- 1

5.1.3

Construction of the Control System......................................................................................................................... 5- 3

5.1.4

Reader Controller PCB............................................................................................................................................ 5- 3

5.2

Basic Sequence..........................................................................................................................................5- 5

5.2.1

Basic Sequence of Operations ................................................................................................................................ 5- 5

5.2.2

Basic Sequence of Operation in Response to a Press on the Start Key................................................................. 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

Controlling the Scanner Motor ................................................................................................................................................. 5- 6

5.3.2

Enlargement/Reduction ........................................................................................................................................... 5- 7

5.3.2.1

Changing the Magnification in Main Scanning Direction.......................................................................................................... 5- 7

5.3.2.2

Changing the Magnification in Sub Scanning Direction ........................................................................................................... 5- 7

5.3.3

Controlling the Scanning Lamp ............................................................................................................................... 5- 8