Toshiba e-STUDIO556 Service Manual page 14

3.7.2 Description of Operation .................................................................................. 3-46
3.7.3 Detection of Abnormality.................................................................................. 3-49
3.7.4 Hibernation function......................................................................................... 3-53
3.8 Control Panel .................................................................................................................. 3-54
3.8.1 General Description ......................................................................................... 3-54
3.8.2 Description of Operation .................................................................................. 3-55
3.9 Scanning Section ............................................................................................................ 3-56
3.9.1 General Description ......................................................................................... 3-56
3.9.2 Construction..................................................................................................... 3-58
3.9.3 Functions ......................................................................................................... 3-59
3.9.4 Description of Operation .................................................................................. 3-62
3.9.5 Automatic Original Size Detection Circuit ........................................................ 3-63
3.10 Laser Optical Unit............................................................................................................ 3-66
3.10.1 General Description ......................................................................................... 3-66
3.10.2 Laser precautions ............................................................................................ 3-68
3.11 Paper Feeding System.................................................................................................... 3-70
3.11.1 General Description ......................................................................................... 3-70
3.11.2 Functions ......................................................................................................... 3-72
3.11.3 Operation ......................................................................................................... 3-74
3.12 Process Related Section................................................................................................. 3-80
3.12.1 Construction..................................................................................................... 3-80
3.12.2 Functions ......................................................................................................... 3-81
3.13 Drum/Cleaner Unit .......................................................................................................... 3-82
3.13.1 Construction..................................................................................................... 3-82
3.13.2 Functions ......................................................................................................... 3-83
3.13.3 Image Quality Control ...................................................................................... 3-84
3.14 Developer Unit ................................................................................................................ 3-85
3.14.1 Construction..................................................................................................... 3-85
3.14.2 Functions ......................................................................................................... 3-86
3.14.3 Developer Unit Drive........................................................................................ 3-90
3.15 Transfer/Transport Unit ................................................................................................... 3-91
3.15.1 General Description ......................................................................................... 3-91
3.15.2 Functions ......................................................................................................... 3-92
3.15.3 General Description of Transfer Belt Unit Operation ....................................... 3-93
3.16 Fuser Unit........................................................................................................................ 3-94
3.16.1 Outline ............................................................................................................. 3-94
3.16.2 Operation ......................................................................................................... 3-94
3.16.3 Functions ......................................................................................................... 3-95
3.16.4 Fuser Control Circuit ........................................................................................ 3-95
3.17 Exit/Reverse Section....................................................................................................... 3-99
3.17.1 General Description ......................................................................................... 3-99
3.17.2 Functions ......................................................................................................... 3-99
3.17.3 Driving of Exit/Reverse section ...................................................................... 3-100
3.17.4 Operation ....................................................................................................... 3-100
3.18 Reversing Automatic Document Feeder (RADF) .......................................................... 3-102
3.18.1 General Description ....................................................................................... 3-102
3.18.2 Functions ....................................................................................................... 3-103
3.18.3 Description of Operation ................................................................................ 3-104
3.19 Power Supply Unit......................................................................................................... 3-108
3.19.1 Construction................................................................................................... 3-108
3.19.2 Operation of DC Output Circuit ...................................................................... 3-109
3.19.3 Output Channel.............................................................................................. 3-111
3.19.4 Fuse............................................................................................................... 3-115
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
e-STUDIO556/656/756/856/557/657/757/857
CONTENTS
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