Canon LBP5050 Series Service Manual page 8

Contents
2.5.1 Overview/Configuration..........................................................................................................................................2- 10
2.5.1.1 Outline.................................................................................................................................................................................... 2- 10
2.5.2 Detecting Jams ......................................................................................................................................................2- 11
2.5.2.1 Jam Detection Outline............................................................................................................................................................ 2- 11
2.5.2.2 Delay Jams ............................................................................................................................................................................ 2- 11
2.5.2.3 Stationary Jams ..................................................................................................................................................................... 2- 11
2.5.2.4 Other Jams ............................................................................................................................................................................ 2- 11
2.5.3 Cassette Pickup .....................................................................................................................................................2- 12
2.5.3.1 Separation Roller Method ...................................................................................................................................................... 2- 12
2.6 FIXING UNIT SYSTEM ............................................................................................................................ 2- 12
2.6.1 Overview/Configuration..........................................................................................................................................2- 12
2.6.1.1 Outline.................................................................................................................................................................................... 2- 12
2.6.2 Various Control Mechanisms .................................................................................................................................2- 13
2.6.2.1 Controlling the Speed of the Fixing Unit ................................................................................................................................ 2- 13
2.6.2.2 Fixing Temperature Control ................................................................................................................................................... 2- 13
2.6.3 Protective Functions ..............................................................................................................................................2- 14
2.6.3.1 Protective function ................................................................................................................................................................. 2- 14
2.6.3.2 Fixing unit failure detection .................................................................................................................................................... 2- 14
2.7 EXTERNAL AND CONTROLS SYSTEM ................................................................................................. 2- 14
2.7.1 Power Supply.........................................................................................................................................................2- 14
2.7.1.1 Power Supply......................................................................................................................................................................... 2- 14
2.7.1.2 Other Function ....................................................................................................................................................................... 2- 15
2.8 ENGINE CONTROL SYSTEM ................................................................................................................. 2- 15
2.8.1 DC Controller .........................................................................................................................................................2- 15
2.8.1.1 Outline.................................................................................................................................................................................... 2- 15
2.8.1.2 Motor control .......................................................................................................................................................................... 2- 16
2.8.1.3 Safety..................................................................................................................................................................................... 2- 17
2.8.2 Main Controller.......................................................................................................................................................2- 17
2.8.2.1 Outline.................................................................................................................................................................................... 2- 17
2.8.2.2 Overview of the Block ............................................................................................................................................................ 2- 17
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 Door.............................................................................................................................................. 3- 1
3.1.1.2 Removing the Rear Door ......................................................................................................................................................... 3- 1
3.1.2 Rear Side Cover ......................................................................................................................................................3- 1
3.1.2.1 Before Removing the Rear Side Cover.................................................................................................................................... 3- 1
3.1.2.2 Removing the Rear Side Cover ............................................................................................................................................... 3- 1
3.1.3 Rear Upper Cover....................................................................................................................................................3- 1
3.1.3.1 Before Removing the Upper Rear Cover ................................................................................................................................. 3- 1
3.1.3.2 Removing the Upper Rear Cover............................................................................................................................................. 3- 1
3.1.4 Right Cover ..............................................................................................................................................................3- 2
3.1.4.1 Removing the Right Cover....................................................................................................................................................... 3- 2
3.1.5 Left Cover ................................................................................................................................................................3- 2
3.1.5.1 Removing the Left Cover ......................................................................................................................................................... 3- 2
3.1.6 Upper Cover.............................................................................................................................................................3- 3
3.1.6.1 Before Removing the Upper Cover Assembly ......................................................................................................................... 3- 3
3.1.6.2 Removing the Upper Cover Assembly..................................................................................................................................... 3- 3
3.1.7 Front Cover ..............................................................................................................................................................3- 3
3.1.7.1 Removing the Front Door......................................................................................................................................................... 3- 3
3.1.8 Main Drive Unit ........................................................................................................................................................3- 5
3.1.8.1 Before Removing the Main Drive Assembly ............................................................................................................................ 3- 5
3.1.8.2 Removing the Main Drive Assembly ........................................................................................................................................ 3- 6
3.1.9 Sub Driver Unit.........................................................................................................................................................3- 8
3.1.9.1 Before Removing the Sub Drive Assembly.............................................................................................................................. 3- 8
3.1.9.2 Removing the Sub Drive Assembly ......................................................................................................................................... 3- 8
3.1.10 Main Motor .............................................................................................................................................................3- 8