Canon iR C3380 series Service Manual page 139

Contents
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..........................................................................................................................................................4-3
4.3.1 Overview...................................................................................................................................................................................... 4-3
4.3.2 Start-Up Sequence ....................................................................................................................................................................... 4-3
4.4 Actions when HDD Error ..............................................................................................................................................4-5
4.4.1 E602 in Detail .............................................................................................................................................................................. 4-5
4.5 Image Processing ...........................................................................................................................................................4-7
4.5.1 Overview of the Flow of Image Data .......................................................................................................................................... 4-7
4.5.2 Reader Input Image Processing ................................................................................................................................................... 4-7
4.5.3 Printer Output Image Processing ................................................................................................................................................. 4-9
4.5.4 Compression, Decompression, and Edit Processing Blocks...................................................................................................... 4-10
4.6 Flow of Image Data......................................................................................................................................................4-10
4.6.1 Flow of Image Data for Copier Functions ................................................................................................................................. 4-10
4.6.2 Flow of Image Data for Box Functions ..................................................................................................................................... 4-11
4.6.3 Flow of Image Data for SEND Functions.................................................................................................................................. 4-11
4.6.4 Flow of Image Data for Fax Transmission Functions ............................................................................................................... 4-12
4.6.5 Flow of Image Data for Fax Reception Functions..................................................................................................................... 4-12
4.6.6 Flow of Image Data for PDL Functions .................................................................................................................................... 4-13
4.7 Parts Replacement Procedure.......................................................................................................................................4-14
4.7.1 Controller Box ........................................................................................................................................................................... 4-14
4.7.1.1 Before Removing the Main Controller Box..................................................................................................................................................4-14
4.7.1.2 Removing the Controller Box .......................................................................................................................................................................4-14
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
Contents