Canon iR6570 series Service Manual page 261

Contents
8.1 Construction ...................................................................................................................................................................8-1
8.1.1 Specifications and construction ................................................................................................................................................... 8-1
8.1.2 Arrangement of Rollers and Sensors ........................................................................................................................................... 8-1
8.1.3 Outline of the Pickup Control System ......................................................................................................................................... 8-3
8.1.4 Outline of the Pickup Assembly Motor Control System ............................................................................................................. 8-5
8.2 Basic Sequence ..............................................................................................................................................................8-7
8.2.1 Pickup from the Right Deck ........................................................................................................................................................ 8-7
8.2.2 Pickup from the Cassette 3 .......................................................................................................................................................... 8-7
8.2.3 Pickup Retry Operation................................................................................................................................................................ 8-8
8.3 Detecting Jams .............................................................................................................................................................8-10
8.3.1 Jam Detection Outline................................................................................................................................................................ 8-10
8.3.1.1 Outline...........................................................................................................................................................................................................8-10
8.3.1.2 Jam History ...................................................................................................................................................................................................8-11
8.3.2 Delay Jams ................................................................................................................................................................................. 8-11
8.3.2.1 Cassette Pickup Assembly (right deck, left deck, cassette 3/4) ....................................................................................................................8-11
8.3.2.2 Other Delay Jam............................................................................................................................................................................................8-11
8.3.3 Stationary Jams .......................................................................................................................................................................... 8-12
8.3.3.1 Common Delay Jams ....................................................................................................................................................................................8-12
8.3.3.2 Power-On Stationary Jam .............................................................................................................................................................................8-13
8.4 Cassette Pick-Up Unit ..................................................................................................................................................8-14
8.4.1 Lifter Operation (cassette 3/4) ................................................................................................................................................... 8-14
8.4.2 Detecting the Presence/Absence of Paper.................................................................................................................................. 8-14
8.4.3 Outline of the Paper Level Detection Mechanism ..................................................................................................................... 8-15
8.4.4 Paper Level Detection (cassette 3/4).......................................................................................................................................... 8-15
8.4.5 Identifying the Size of Paper (cassette 3/4) ............................................................................................................................... 8-16
8.4.6 Markings on the Width Guide Rail ............................................................................................................................................ 8-16
8.4.7 Paper Size................................................................................................................................................................................... 8-17
8.5 Manual Feed Pickup Unit ............................................................................................................................................8-19
8.5.1 Pickup Operation ....................................................................................................................................................................... 8-19
8.5.2 Detecting the Size of Paper in the Manual Feed Tray ............................................................................................................... 8-19
8.6 Deck .............................................................................................................................................................................8-21
8.6.1 Lifter Operation (right/left deck) ............................................................................................................................................... 8-21
8.6.2 Lifter Limiter (right/left deck) Control Circuit .......................................................................................................................... 8-21
8.6.3 Detecting the Presence/Absence of Paper.................................................................................................................................. 8-22
8.6.4 Outline of Paper Level Detection .............................................................................................................................................. 8-23
8.6.5 Paper Level Detection Operation (right/left deck)..................................................................................................................... 8-23
8.6.6 Identifying the Size of Paper (right/left deck) ........................................................................................................................... 8-24
8.7 Registration Unit ..........................................................................................................................................................8-25
8.7.1 Outline........................................................................................................................................................................................ 8-25
8.7.2 Control System........................................................................................................................................................................... 8-25
8.8 Duplex Feeding Unit ....................................................................................................................................................8-26
8.8.1 Moving the Paper to the Reversing Assembly After Printing on the 1st Side........................................................................... 8-26
8.8.2 Moving the Paper to the Duplexing Feed Assembly From the Reversing Assembly ............................................................... 8-26
8.8.3 Outline........................................................................................................................................................................................ 8-27
8.8.4 Sequence of Printing Operation ................................................................................................................................................. 8-27
8.8.5 Outline of Through-Path Operation ........................................................................................................................................... 8-28
8.8.6 Through-Path Operation ............................................................................................................................................................ 8-28
8.8.7 Outline of Horizontal Registration Position .............................................................................................................................. 8-32
8.8.8 Horizontal Registration Position Detection Operation .............................................................................................................. 8-33
8.9 Delivery........................................................................................................................................................................8-34
Contents