Canon iR4570 Series Service Manual page 14

Contents
7.12.9.9 Removing the Left Cover ................................................................................................................ 7- 61
7.12.9.10 Removing the Laser Unit............................................................................................................... 7- 61
7.12.9.11 Removing the Hopper Assembly................................................................................................... 7- 62
7.12.9.12 Removing the Toner Level Sensor ................................................................................................ 7- 63
7.12.10 Toner Feedscrew Motor ....................................................................................................................... 7- 63
7.12.10.1 Removing the Front Cover Unit .................................................................................................... 7- 63
7.12.10.2 Removing the Waste Toner Case................................................................................................... 7- 64
7.12.10.3 Removing the Toner Cartridge ...................................................................................................... 7- 64
7.12.10.4 Removing the Drum Unit .............................................................................................................. 7- 65
7.12.10.5 Removing the Developing Assembly ............................................................................................ 7- 66
7.12.10.6 Removing the Upper Tray ............................................................................................................. 7- 67
7.12.10.7 Removing the Toner Cartridge Cover ........................................................................................... 7- 68
7.12.10.8 Removing the Pre-Exposure Lamp................................................................................................ 7- 68
7.12.10.9 Removing the Left Cover .............................................................................................................. 7- 68
7.12.10.10 Removing the Laser Unit............................................................................................................. 7- 69
7.12.10.11 Removing the Hopper Assembly................................................................................................. 7- 70
7.12.10.12 Removing the Toner Feedscrew Motor ....................................................................................... 7- 71
7.12.11 Static Charge Eliminator ....................................................................................................................... 7- 71
7.12.11.1 Removing the Static Eliminator..................................................................................................... 7- 71
Chapter 8 Pickup/Feeding System
8.1 Construction....................................................................................................................................................... 8- 1
8.1.1Specifications, Controls, and Functions ...................................................................................................... 8- 1
8.1.2Division into Blocks .................................................................................................................................... 8- 2
8.1.3Division into Blocks .................................................................................................................................... 8- 3
8.1.4Arrangement of Rollers ............................................................................................................................... 8- 4
8.1.5Arrangement of Rollers ............................................................................................................................... 8- 5
8.1.6Diagram of Paper Paths (printer on its own) ............................................................................................... 8- 6
8.1.7Diagram of Paper Paths (w/ copy tray )....................................................................................................... 8- 7
8.1.8Diagram of Paper Paths (w/ 3 Way Unit-A1 /copy tray)............................................................................. 8- 8
8.1.9Diagram of Paper Paths (w/ Finisher-S1/copy tray).................................................................................... 8- 9
8.1.10Diagram of Paper Paths (w/ Finisher-Q3/Saddle Finisher-Q4) ............................................................... 8- 10
8.1.11Arrangement of Sensors .......................................................................................................................... 8- 11
8.1.12Arrangement of Sensors .......................................................................................................................... 8- 12
8.1.13Route of Drive ......................................................................................................................................... 8- 14
8.1.14Route of Drive ......................................................................................................................................... 8- 14
8.2 Basic Sequence ................................................................................................................................................ 8- 17
8.2.1Basic Sequence ......................................................................................................................................... 8- 17
8.2.2Increase in Speed ....................................................................................................................................... 8- 17
8.2.3Increase in Speed ....................................................................................................................................... 8- 20
8.3 Detecting Jams................................................................................................................................................. 8- 23
8.3.1 Delivery Jams ............................................................................................................................................ 8- 23
8.3.1.1 Delay Jam Outside the Cassette Pickup Assembly............................................................................ 8- 23
8.3.1.2 Delay Jam in the Cassette Pickup Assembly ..................................................................................... 8- 23
8.3.2 Stationary Jams ......................................................................................................................................... 8- 24
8.3.2.1 Common Stationary Jam.................................................................................................................... 8- 24
8.3.2.2 Stationary Jam at Power-On .............................................................................................................. 8- 25
8.3.3 Other Jams................................................................................................................................................. 8- 25
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