Canon LBP3250 Series Service Manual page 6

Contents
2.5 PICKUP AND FEEDING SYSTEM........................................................................................................... 2- 15
2.5.1 Overview/Configuration..........................................................................................................................................2- 15
2.5.1.1 Overview ................................................................................................................................................................................ 2- 15
2.5.2 Detecting Jams ......................................................................................................................................................2- 16
2.5.2.1 Jam Detection Outline............................................................................................................................................................ 2- 16
2.5.2.2 Delay Jams ............................................................................................................................................................................ 2- 17
2.5.2.3 Stationary Jams ..................................................................................................................................................................... 2- 17
2.5.2.4 Other Jams ............................................................................................................................................................................ 2- 17
2.6 EXTERNAL AND CONTROLS SYSTEM ................................................................................................. 2- 18
2.6.1 Power Supply.........................................................................................................................................................2- 18
2.6.1.1 Power Supply......................................................................................................................................................................... 2- 18
2.6.1.2 Protective Functions .............................................................................................................................................................. 2- 19
2.7 ENGINE CONTROL SYSTEM ................................................................................................................. 2- 20
2.7.1 Main Controller.......................................................................................................................................................2- 20
2.7.1.1 General description................................................................................................................................................................ 2- 20
2.7.2 Engine Controller ...................................................................................................................................................2- 21
2.7.2.1 General description................................................................................................................................................................ 2- 21
2.8 FIXING UNIT/DELIVERY SYSTEM.......................................................................................................... 2- 22
2.8.1 Overview/Configuration..........................................................................................................................................2- 22
2.8.1.1 Overview ................................................................................................................................................................................ 2- 22
2.8.1.2 Main Parts of Fixing Unit........................................................................................................................................................ 2- 22
2.8.2 Various Control Mechanisms .................................................................................................................................2- 23
2.8.2.1 Fixing Temperature Control ................................................................................................................................................... 2- 23
2.8.2.2 Protective Functions .............................................................................................................................................................. 2- 24
2.8.3 Other Functions .....................................................................................................................................................2- 25
2.8.3.1 Throughput Down Control...................................................................................................................................................... 2- 25
Chapter 3 DISASSEMBLY AND ASSEMBLY
3.1 EXTERNAL AND CONTROLS SYSTEM ................................................................................................... 3- 1
3.1.1 Rear Cover...............................................................................................................................................................3- 1
3.1.1.1 Before Removing the Rear Cover............................................................................................................................................ 3- 1
3.1.1.2 Removing the Rear Cover ....................................................................................................................................................... 3- 1
3.1.2 Right Cover ..............................................................................................................................................................3- 1
3.1.2.1 Before Removing the Right Cover ........................................................................................................................................... 3- 1
3.1.2.2 Removing the Right Cover....................................................................................................................................................... 3- 1
3.1.3 Left Cover ................................................................................................................................................................3- 1
3.1.3.1 Before Removing the Left Cover.............................................................................................................................................. 3- 1
3.1.3.2 Removing the Left Cover ......................................................................................................................................................... 3- 1
3.1.4 Upper Cover.............................................................................................................................................................3- 2
3.1.4.1 Removing the Upper Cover ..................................................................................................................................................... 3- 2
3.1.5 Front Cover ..............................................................................................................................................................3- 3
3.1.5.1 Before Removing the Front Cover ........................................................................................................................................... 3- 3
3.1.5.2 Removing the Front Cover....................................................................................................................................................... 3- 3
3.1.6 Delivery Tray............................................................................................................................................................3- 3
3.1.6.1 Removing the Delivery Auxiliary Tray ...................................................................................................................................... 3- 3
3.1.7 Pickup Tray ..............................................................................................................................................................3- 3
3.1.7.1 Before Removing the Pickup Tray ........................................................................................................................................... 3- 3
3.1.7.2 Removing the Pickup Tray Unit ............................................................................................................................................... 3- 3
3.1.8 Drive Unit .................................................................................................................................................................3- 4
3.1.8.1 Before Removing the Drive Belt............................................................................................................................................... 3- 4
3.1.8.2 Removing the Drive Belt .......................................................................................................................................................... 3- 4
3.1.9 Main Drive Unit ........................................................................................................................................................3- 5
3.1.9.1 Before Removing the Main Motor ............................................................................................................................................ 3- 5
3.1.9.2 Removing the Main Motor........................................................................................................................................................ 3- 5
3.1.10 Engine controller board ..........................................................................................................................................3- 7
3.1.10.1 Before Removing the Engine Controller PCB ........................................................................................................................ 3- 7
3.1.10.2 Removing the Engine Controller PCB.................................................................................................................................... 3- 7
3.1.11 Main Controller PCB ..............................................................................................................................................3- 8