Canon DADF-Q1 Service Manual page 21

Contents
2.1 Basic Construction .........................................................................................................................................................2-1
2.1.1 Overview of Electrical Circuit ..................................................................................................................................................... 2-1
2.1.2 Inputs to ADF Controller PCB .................................................................................................................................................... 2-2
2.1.3 Outputs from ADF Controller PCB ............................................................................................................................................. 2-4
2.2 Basic Operation..............................................................................................................................................................2-4
2.2.1 Outline.......................................................................................................................................................................................... 2-4
2.2.2 Outline.......................................................................................................................................................................................... 2-6
2.2.3 CW Pickup/Delivery .................................................................................................................................................................... 2-7
2.2.4 Pre-Reversal/Reversal/Delivery................................................................................................................................................... 2-7
2.2.5 Manual Feeder Pickup/Delivery .................................................................................................................................................. 2-8
2.3 Document Detection ......................................................................................................................................................2-9
2.3.1 Outline.......................................................................................................................................................................................... 2-9
2.3.2 Detecting the Presence/Absence of an Original........................................................................................................................... 2-9
2.3.3 Original Size Detection 1........................................................................................................................................................... 2-10
2.3.4 Original Size Detection 2........................................................................................................................................................... 2-11
2.3.5 Detecting the Presence/Absence of an Original in the Manual Feeder...................................................................................... 2-14
2.4 Document Pickup/Separation.......................................................................................................................................2-15
2.4.1 Outline........................................................................................................................................................................................ 2-15
2.4.2 Moving Up/Down the Pickup Roller Unit ................................................................................................................................. 2-15
2.4.3 Switching the Separation Pressure............................................................................................................................................. 2-17
2.4.4 Separation Sensor (S4) and Skew Sensor (S5) .......................................................................................................................... 2-18
2.4.5 Controlling the Pickup Motor (M3) ........................................................................................................................................... 2-19
2.4.6 Controlling the Separation Motor (M4) ..................................................................................................................................... 2-19
2.4.7 Sequence of Operations ............................................................................................................................................................. 2-20
2.5 Document Feeding/Delivery ........................................................................................................................................2-20
2.5.1 Outline........................................................................................................................................................................................ 2-20
2.5.2 Controlling the Belt Motor (M2) ............................................................................................................................................... 2-21
2.5.3 Controlling the Delivery Motor (M5) ........................................................................................................................................ 2-22
2.6 Feeding Unit.................................................................................................................................................................2-22
2.6.1 Outline of CW Pickup/Delivery................................................................................................................................................. 2-22
2.6.2 CW Pickup/Delivery Fixed Reading ......................................................................................................................................... 2-23
2.6.3 CW Pickup/Delivery (stream reading) ...................................................................................................................................... 2-27
2.6.4 Double-Sided Originals (fixed reading) .................................................................................................................................... 2-33
2.6.5 Fixed Reading (continuous; double-sided original)................................................................................................................... 2-39
2.6.6 Controlling the Reversal Motor (M1) ........................................................................................................................................ 2-46
2.6.7 Manual Feeder Pickup/Delivery Operation ............................................................................................................................... 2-46
2.7 Detecting Jams .............................................................................................................................................................2-47
2.7.1 Overview ................................................................................................................................................................................... 2-47
2.7.2 List of Jam Code ........................................................................................................................................................................ 2-48
2.7.3 Alarm Code ................................................................................................................................................................................ 2-51
2.8 Power Supply ...............................................................................................................................................................2-51
2.8.1 Overview.................................................................................................................................................................................... 2-51
Contents