Canon iR C3380 series Service Manual page 10

Contents
4.7.2 Main Controller PCB (main) ...................................................................................................................................4- 14
4.7.2.1 Before Removing the Main Controller PCB ........................................................................................................................... 4- 14
4.7.2.2 Removing the Main Controller PCB ....................................................................................................................................... 4- 14
4.7.2.3 Replacing Main Controller PCB ............................................................................................................................................ 4- 14
4.7.3 Main Controller PCB (sub R-A)..............................................................................................................................4- 15
4.7.3.1 Before Removing the Main Controller PCB (sub-R-A)........................................................................................................... 4- 15
4.7.3.2 Removing the Main Controller PCB (sub-R-A) ...................................................................................................................... 4- 15
4.7.4 Main Controller PCB (sub PDRM-A)......................................................................................................................4- 15
4.7.4.1 Before Removing the Main Controller PCB (sub-PDRAM-A) ................................................................................................ 4- 15
4.7.4.2 Removing the Main Controller PCB (sub-PDRAM-A) ............................................................................................................ 4- 15
4.7.5 Main Controller PCB (sub SJ-A) ............................................................................................................................4- 15
4.7.5.1 Before Removing the Main Controller PCB (sub SJ-A) ......................................................................................................... 4- 15
4.7.5.2 Removing the Main Controller PCB (sub SJ-A) ..................................................................................................................... 4- 15
4.7.6 Main Controller PCB (sub LAN-A) .........................................................................................................................4- 16
4.7.6.1 Before Removing the Main Controller PCB (sub LANBAR-C) ............................................................................................... 4- 16
4.7.6.2 Removing the Main Controller PCB (sub LANBAR-C)........................................................................................................... 4- 16
4.7.7 Main Controller PCB (sub RB-A) ...........................................................................................................................4- 16
4.7.7.1 Before Removing the Main Controller PCB (sub RB-A2)....................................................................................................... 4- 16
4.7.7.2 Removing the Main Controller PCB (sub RB-A2) .................................................................................................................. 4- 16
4.7.8 SRAM PCB ............................................................................................................................................................4- 17
4.7.8.1 Before Removing the SRAM.................................................................................................................................................. 4- 17
4.7.8.2 Removing the SRAM ............................................................................................................................................................. 4- 17
4.7.8.3 When Replacing the SRAM PCB........................................................................................................................................... 4- 17
4.7.9 Boot ROM PCB......................................................................................................................................................4- 17
4.7.9.1 Before Removing the Boot ROM PCB ................................................................................................................................... 4- 17
4.7.9.2 Removing the Boot ROM PCB............................................................................................................................................... 4- 17
4.7.10 Image Memory (SDRAM).....................................................................................................................................4- 17
4.7.10.1 Before Removing the Image Memory (SDRAM) PCB.......................................................................................................... 4- 17
4.7.10.2 Removing the Image Memory (SDRAM) PCB ..................................................................................................................... 4- 18
4.7.11 HDD .....................................................................................................................................................................4- 18
4.7.11.1 Before Removing the HDD................................................................................................................................................... 4- 18
4.7.11.2 Removing the HDD .............................................................................................................................................................. 4- 18
4.7.11.3 When Replacing the HDD .................................................................................................................................................... 4- 18
4.7.12 Controller Fan ......................................................................................................................................................4- 19
4.7.12.1 Before Removing the Controller Fan.................................................................................................................................... 4- 19
4.7.12.2 Removing the Controller Fan ............................................................................................................................................... 4- 19
Chapter 5 Original Exposure System
5.1 Construction ............................................................................................................................................... 5- 1
5.1.1 Specifications, Control Mechanisms, and Functions ...............................................................................................5- 1
5.1.2 Major Components...................................................................................................................................................5- 1
5.1.3 Construction of the Control System .........................................................................................................................5- 2
5.1.4 Reader Controller PCB ............................................................................................................................................5- 3
5.2 Basic Sequence ......................................................................................................................................... 5- 4
5.2.1 Basic Sequence of Operations at Power-On ...........................................................................................................5- 4
5.2.2 Basic Sequence of Operations in Response to a Press on the Start Key (book mode, 1 original)..........................5- 4
5.2.3 Basic Sequence of Operations in Response to a Press on the Start Key (ADF mode, 1 original) ..........................5- 5
5.3 Various Control Mechanisms ..................................................................................................................... 5- 6
5.3.1 Controlling the Scanner Drive System .....................................................................................................................5- 6
5.3.1.1 Overview .................................................................................................................................................................................. 5- 6
5.3.1.2 Reader Motor Control .............................................................................................................................................................. 5- 6
5.3.2 Contact Image Sensor (CIS)....................................................................................................................................5- 8
5.3.2.1 Overview .................................................................................................................................................................................. 5- 8
5.3.2.2 Analog Control Inside the Contact Image Sensor (CIS) .......................................................................................................... 5- 9
5.3.3 Enlargement/Reduction ...........................................................................................................................................5- 9
5.3.3.1 Changing the Magnification in Main Scanning Direction.......................................................................................................... 5- 9
5.3.3.2 Changing the Magnification in Sub Scanning Direction ........................................................................................................... 5- 9
5.3.4 Controlling the Scanning Lamp..............................................................................................................................5- 10