Canon iPF780 Series Service Manual page 58

Contents
2.1 Basic Operation Outline.................................................................................................................................................2-1
2.1.1 Printer Diagram............................................................................................................................................................................ 2-1
2.1.2 Print Signal Sequence .................................................................................................................................................................. 2-2
2.1.3 Print Driving ................................................................................................................................................................................ 2-3
2.2 Firmware ........................................................................................................................................................................2-5
2.2.1 Operation Sequence at Power-on................................................................................................................................................. 2-5
2.2.2 Operation Sequence at Power-off ................................................................................................................................................ 2-6
2.2.3 Print Position Adjustment Function............................................................................................................................................. 2-7
2.2.4 Head Management ....................................................................................................................................................................... 2-7
2.2.5 Printhead Overheating Protection Control................................................................................................................................... 2-7
2.2.6 Pause between Pages.................................................................................................................................................................... 2-7
2.2.7 White Raster Skip ........................................................................................................................................................................ 2-7
2.2.8 Sleep Mode .................................................................................................................................................................................. 2-7
2.2.9 Shut Down Mode ......................................................................................................................................................................... 2-7
2.2.10 Hard Disk Drive ......................................................................................................................................................................... 2-8
2.3 Printer Mechanical System ............................................................................................................................................2-9
2.3.1 Outline.......................................................................................................................................................................................... 2-9
2.3.1.1 Outline.............................................................................................................................................................................................................2-9
2.3.2 Ink Passage................................................................................................................................................................................. 2-10
2.3.2.1 Ink Passage....................................................................................................................................................................................................2-10
2.3.2.1.1 Overview of Ink Passage.......................................................................................................................................................................2-10
2.3.2.2 Ink Tank Unit ................................................................................................................................................................................................2-11
2.3.2.2.1 Structure of Ink Tank Unit ....................................................................................................................................................................2-11
2.3.2.3 Carriage Unit .................................................................................................................................................................................................2-13
2.3.2.3.1 Functions of Carriage Unit....................................................................................................................................................................2-13
2.3.2.3.2 Structure of Carriage Unit .....................................................................................................................................................................2-14
2.3.2.4 Printhead .......................................................................................................................................................................................................2-17
2.3.2.4.1 Structure of Printhead............................................................................................................................................................................2-17
2.3.2.5 Purge Unit .....................................................................................................................................................................................................2-18
2.3.2.5.1 Functions of Purge Unit ........................................................................................................................................................................2-18
2.3.2.5.2 Structure of Purge Unit .........................................................................................................................................................................2-21
2.3.2.6 Maintenance Cartridge ..................................................................................................................................................................................2-23
2.3.2.6.1 Maintenance Cartridge ..........................................................................................................................................................................2-23
2.3.2.7 Air Flow ........................................................................................................................................................................................................2-24
2.3.2.7.1 Air Flow ................................................................................................................................................................................................2-24
2.3.3 Paper Path .................................................................................................................................................................................. 2-26
2.3.3.1 Outline...........................................................................................................................................................................................................2-26
2.3.3.1.1 Overview of Paper Path.........................................................................................................................................................................2-26
2.3.3.2 Paper Path......................................................................................................................................................................................................2-27
2.3.3.2.1 Structure of Feed Roller Unit ................................................................................................................................................................2-27
2.3.3.3 Cutter Unit.....................................................................................................................................................................................................2-29
2.3.3.3.1 Structure of Cutter Unit.........................................................................................................................................................................2-29
2.4 Printer Electrical System..............................................................................................................................................2-30
2.4.1 Outline........................................................................................................................................................................................ 2-30
2.4.1.1 Overview .......................................................................................................................................................................................................2-30
2.4.2 Main Controller.......................................................................................................................................................................... 2-32
2.4.2.1 Main controller PCB components.................................................................................................................................................................2-32
2.4.2.2 Connectors and Pin Arrangement of Main controller PCB ..........................................................................................................................2-34
2.4.2.3 HDD expansion PCB components ................................................................................................................................................................2-41
2.4.3 Carriage Relay PCB................................................................................................................................................................... 2-41
2.4.3.1 Carriage PCB components ............................................................................................................................................................................2-41
2.4.3.2 Connectors and Pin Arrangement of Carriage PCB......................................................................................................................................2-42
2.4.4 Maintenance Cartridge Relay PCB ............................................................................................................................................ 2-46
Contents