Canon iR C2880 Series Service Manual page 277

Contents
8.1 Construction ...................................................................................................................................................................8-1
8.1.1 Specifications, Controls, and Functions....................................................................................................................................... 8-1
8.1.2 Division into Blocks .................................................................................................................................................................... 8-3
8.1.3 Arrangement of Rollers................................................................................................................................................................ 8-4
8.1.4 Diagram of Paper Paths (w/ copy tray )....................................................................................................................................... 8-5
8.1.5 Diagram of Paper Paths (w/ Finisher-Z1/copy tray).................................................................................................................... 8-6
8.1.6 Diagram of Paper Paths (w/ Finisher-Y1/Saddle Finisher-Y2) ................................................................................................... 8-6
8.1.7 Arrangement of Sensors............................................................................................................................................................... 8-7
8.1.8 Route of Drive.............................................................................................................................................................................. 8-9
8.2 Basic Sequence ............................................................................................................................................................8-10
8.2.1 Basic Sequence .......................................................................................................................................................................... 8-10
8.3 Controlling the Feeding Speed.....................................................................................................................................8-10
8.3.1 Increase in Speed ....................................................................................................................................................................... 8-10
8.3.2 Feeding Speed According to the Print Media and Resolution .................................................................................................. 8-11
8.3.3 Feeding Speed of Each Feeding Path and Timing for Switching Feeding Speed .................................................................... 8-12
8.3.4 Reversing Accelerating Control of Large Size Paper ................................................................................................................ 8-14
8.4 Detecting Jams .............................................................................................................................................................8-15
8.4.1 Delay Jams ................................................................................................................................................................................. 8-15
8.4.1.1 Delay Jam for Those Other Than the Pickup Unit ........................................................................................................................................8-15
8.4.1.2 Delay Jam for the Pickup Unit ......................................................................................................................................................................8-17
8.4.2 Stationary Jams .......................................................................................................................................................................... 8-17
8.4.2.1 Common Stationary Jam ...............................................................................................................................................................................8-17
8.4.2.2 Stationary Jam at Power-On..........................................................................................................................................................................8-17
8.4.3 Other Jams ................................................................................................................................................................................. 8-18
8.4.3.1 Size Difference Jam ......................................................................................................................................................................................8-18
8.4.3.2 Material Difference Jam................................................................................................................................................................................8-18
8.4.3.3 Door Open Jam .............................................................................................................................................................................................8-18
8.5 Cassette Pick-Up Unit ..................................................................................................................................................8-18
8.5.1 Overview.................................................................................................................................................................................... 8-18
8.5.2 Basic Sequence ......................................................................................................................................................................... 8-20
8.5.3 Identifying the Paper Size .......................................................................................................................................................... 8-20
8.5.4 Setting Up the Universal Cassette.............................................................................................................................................. 8-22
8.5.5 Paper Level Sensor .................................................................................................................................................................... 8-22
8.6 Manual Feed Pickup Unit ............................................................................................................................................8-24
8.6.1 Overview.................................................................................................................................................................................... 8-24
8.6.2 Basic Sequence of Operation ..................................................................................................................................................... 8-26
8.6.3 Identifying the Paper Size .......................................................................................................................................................... 8-27
8.7 Registration Unit ..........................................................................................................................................................8-27
8.7.1 Overview.................................................................................................................................................................................... 8-27
8.7.2 Control of Registration Unit ..................................................................................................................................................... 8-28
8.7.3 Checking Horizontal Registration.............................................................................................................................................. 8-28
8.7.4 Material Difference Jam Detection ........................................................................................................................................... 8-29
8.8 Pre-Fixing Feeding.......................................................................................................................................................8-29
8.8.1 Fixing Arch Control ................................................................................................................................................................... 8-29
8.9 Duplex Feeding Unit ....................................................................................................................................................8-31
8.9.1 Overview.................................................................................................................................................................................... 8-31
8.9.2 The Number of Circulating Sheets at Duplexing Feeding......................................................................................................... 8-32
8.9.3 Duplexing Re-Pickup Control.................................................................................................................................................... 8-32
8.9.4 Sequence of Image Formation ................................................................................................................................................... 8-32
8.9.5 Flow of Paper ............................................................................................................................................................................ 8-33
Contents