Canon Color imageCLASS MF9170c Service Manual page 76

Contents
4.1 Basic Construction......................................................................................................................................................... 4-1
4.1.1 Overview ...................................................................................................................................................................................... 4-1
4.1.2 Major Components....................................................................................................................................................................... 4-1
4.2 Basic Sequence .............................................................................................................................................................. 4-3
4.2.1 Basic Sequence of Operation at Power-on ................................................................................................................................... 4-3
4.2.2 Basic Sequence of Operation in Response to a Press on the Start Key (book)............................................................................ 4-4
4.3 Various Control ............................................................................................................................................................. 4-5
4.3.1 Lamp Control ............................................................................................................................................................................... 4-5
4.3.1.1 Overview.........................................................................................................................................................................................................4-5
4.3.2 Enlargement/Reduction................................................................................................................................................................ 4-6
4.3.2.1 Overview.........................................................................................................................................................................................................4-6
4.3.3 Detecting the Size of Originals .................................................................................................................................................... 4-6
4.3.3.1 Overview.........................................................................................................................................................................................................4-6
4.3.4 Dirt Sensor Control ...................................................................................................................................................................... 4-7
4.3.4.1 Overview.........................................................................................................................................................................................................4-7
4.3.4.2 Stream Reading Position Shift ........................................................................................................................................................................4-7
4.4 Parts Replacement Procedure ........................................................................................................................................ 4-8
4.4.1 ADF Unit + Reader Unit .............................................................................................................................................................. 4-8
4.4.1.1 Before Removing the ADF Unit + Reader Unit .............................................................................................................................................4-8
4.4.1.2 Removing the ADF Unit + Reader Unit .........................................................................................................................................................4-8
4.4.1.3 Procedure after Replacing the ADF Unit...................................................................................................................................................... 4-10
4.4.1.4 Procedure after Replacing the Reader Unit...................................................................................................................................................4-10
4.4.2 Reader Unit ................................................................................................................................................................................ 4-10
4.4.2.1 Before Removing the Reader Unit................................................................................................................................................................ 4-10
4.4.2.2 Removing the Reader Unit............................................................................................................................................................................ 4-10
4.4.2.3 Procedure after Replacing the Reader Unit...................................................................................................................................................4-11
Contents