Toshiba e-STUDIO556 Service Manual page 12

3.8 Scanning Section ............................................................................................................ 3-49
3.8.1 General Description ......................................................................................... 3-49
3.8.2 Construction..................................................................................................... 3-50
3.8.3 Functions ......................................................................................................... 3-51
3.8.4 Description of Operation .................................................................................. 3-52
3.8.5 Automatic Original Size Detection Circuit ........................................................ 3-53
3.9 Laser Optical Unit............................................................................................................ 3-55
3.9.1 General Description ......................................................................................... 3-55
3.9.2 Structure .......................................................................................................... 3-56
3.10 Paper Feeding System.................................................................................................... 3-58
3.10.1 General Description ......................................................................................... 3-58
3.10.2 Functions ......................................................................................................... 3-60
3.10.3 Operation ......................................................................................................... 3-62
3.11 Process Related Section................................................................................................. 3-68
3.11.1 Construction..................................................................................................... 3-68
3.11.2 Functions ......................................................................................................... 3-69
3.12 Drum/Cleaner Unit .......................................................................................................... 3-70
3.12.1 Construction..................................................................................................... 3-70
3.12.2 Functions ......................................................................................................... 3-71
3.12.3 Image Quality Control ...................................................................................... 3-72
3.13 Developer Unit ................................................................................................................ 3-73
3.13.1 Construction..................................................................................................... 3-73
3.13.2 Functions ......................................................................................................... 3-74
3.13.3 Developer Unit Drive........................................................................................ 3-78
3.14 Transfer/Transport Unit ................................................................................................... 3-79
3.14.1 General Description ......................................................................................... 3-79
3.14.2 Functions ......................................................................................................... 3-80
3.14.3 General Description of Transfer Belt Unit Operation ....................................... 3-81
3.15 Fuser Unit........................................................................................................................ 3-82
3.15.1 Outline ............................................................................................................. 3-82
3.15.2 Operation ......................................................................................................... 3-82
3.15.3 Functions ......................................................................................................... 3-83
3.15.4 Fuser Control Circuit ........................................................................................ 3-83
3.16 Exit/Reverse Section....................................................................................................... 3-87
3.16.1 General Description ......................................................................................... 3-87
3.16.2 Functions ......................................................................................................... 3-87
3.16.3 Driving of Exit/Reverse section ........................................................................ 3-88
3.16.4 Operation ......................................................................................................... 3-88
3.17 Reversing Automatic Document Feeder (RADF) ............................................................ 3-90
3.17.1 General Description ......................................................................................... 3-90
3.17.2 Functions ......................................................................................................... 3-91
3.17.3 Description of Operation .................................................................................. 3-92
3.18 Power Supply Unit........................................................................................................... 3-97
3.18.1 Construction..................................................................................................... 3-97
3.18.2 Operation of DC Output Circuit ........................................................................ 3-98
3.18.3 Output Channel.............................................................................................. 3-100
3.18.4 Fuse............................................................................................................... 3-102
4. DISASSEMBLY AND REPLACEMENT........................................................................ 4-1
4.1 Installation and Replacement of Covers ........................................................................... 4-1
4.1.1 Front cover (Upper/Lower)................................................................................. 4-1
4.1.2 Front right inner cover........................................................................................ 4-1
4.1.3 Top right cover................................................................................................... 4-2
4.1.4 FAN cover.......................................................................................................... 4-2
4.1.5 Top left cover ..................................................................................................... 4-2
4.1.6 Top rear cover ................................................................................................... 4-3
4.1.7 Right upper cover .............................................................................................. 4-3
4.1.8 Right center cover.............................................................................................. 4-3
4.1.9 Right rear cover ................................................................................................. 4-4
e-STUDIO556/656/756/856(Ver03)
CONTENTS
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