Canon Color iR C3480 Service Manual page 9

Contents
Chapter 3 Basic Operation
3.1 Construction..................................................................................................................................................... 3- 1
3.1.1 Functional Construction .......................................................................................................................... 3- 1
3.1.2 Connections Among Major PCBs.......................................................................................................... 3- 2
3.2 Basic Sequence .............................................................................................................................................. 3- 3
3.2.1 Basic Sequence of Operations at Power-On ...................................................................................... 3- 3
3.2.2 Basic Sequence of Operations for a Print Job (full color) ................................................................. 3- 3
3.2.3 Basic Sequence of Operations for a Print Job (mono color) ............................................................ 3- 4
Chapter 4 Main Controller
4.1 Construction..................................................................................................................................................... 4- 1
4.1.1 Construction and Functions ................................................................................................................... 4- 1
4.2 Construction of the Electrical Circuitry ........................................................................................................ 4- 2
4.2.1 Main Controller PCB (main) ................................................................................................................... 4- 2
4.2.2 SRAM PCB ............................................................................................................................................... 4- 2
4.3 Start-Up Sequence ......................................................................................................................................... 4- 4
4.3.1 Overview ................................................................................................................................................... 4- 4
4.3.2 Start-Up Sequence .................................................................................................................................. 4- 4
4.4 Actions when HDD Error ............................................................................................................................... 4- 7
4.4.1 E602 in Detail ........................................................................................................................................... 4- 7
4.5 Image Processing ......................................................................................................................................... 4- 11
4.5.1 Overview of the Flow of Image Data .................................................................................................. 4- 11
4.5.2 Reader Input Image Processing.......................................................................................................... 4- 11
4.5.3 Printer Output Image Processing ........................................................................................................ 4- 13
4.5.4 Compression, Decompression, and Edit Processing Blocks.......................................................... 4- 14
4.6 Flow of Image Data ...................................................................................................................................... 4- 14
4.6.1 Flow of Image Data for Copier Functions .......................................................................................... 4- 14
4.6.2 Flow of Image Data for Box Functions ............................................................................................... 4- 15
4.6.3 Flow of Image Data for SEND Functions........................................................................................... 4- 15
4.6.4 Flow of Image Data for Fax Transmission Functions ...................................................................... 4- 16
4.6.5 Flow of Image Data for Fax Reception Functions ............................................................................ 4- 16
4.6.6 Flow of Image Data for PDL Functions .............................................................................................. 4- 17
4.7 Parts Replacement Procedure ................................................................................................................... 4- 18
4.7.1 Controller Box ......................................................................................................................................... 4- 18
4.7.1.1 Before Removing the Main Controller Box ................................................................................. 4- 18
4.7.1.2 Removing the Controller Box ........................................................................................................ 4- 18
4.7.2 Main Controller PCB (main).................................................................................................................. 4- 18
4.7.2.1 Before Removing the Main Controller PCB ................................................................................ 4- 18
4.7.2.2 Removing the Main Controller PCB............................................................................................. 4- 18
4.7.2.3 Replacing Main Controller PCB ................................................................................................... 4- 19
4.7.3 Main Controller PCB (sub R-A) ............................................................................................................ 4- 19
4.7.3.1 Before Removing the Main Controller PCB (sub-R-A) ............................................................. 4- 19
4.7.3.2 Removing the Main Controller PCB (sub-R-A) .......................................................................... 4- 19
4.7.4 Main Controller PCB (sub PDRM-A) ................................................................................................... 4- 19
4.7.4.1 Before Removing the Main Controller PCB (sub-PDRAM-A) .................................................. 4- 19
4.7.4.2 Removing the Main Controller PCB (sub-PDRAM-A)............................................................... 4- 19
4.7.5 Main Controller PCB (sub SJ-A) .......................................................................................................... 4- 20
4.7.5.1 Before Removing the Main Controller PCB (sub SJ-A) ............................................................ 4- 20
4.7.5.2 Removing the Main Controller PCB (sub SJ-A)......................................................................... 4- 20