Toshiba e-studio281c Service Manual

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SERVICE MANUAL

MULTIFUNCTIONAL DIGITAL COLOR SYSTEMS

e-STUDIO281c/351c/451c

File No. SME050004D0

R05032182501-TTEC

Ver04_2008-04

Default Chapter1
- Service Manual1
- Table of Contents7
1 Specifications/Accessories/Options/Supplies17
- Accessories17
- Options18
- Supplies19
- System List20
2 Outline of the Machine21
- Sectional View21
- Electric Parts Layout25
- Symbols and Functions of Various Components35
- General Description42
  - System Block Diagram42
  - Construction of Boards43
- Disassembly and Replacement of Covers45
- Disassembly and Replacement of PC Boards/Hdd53
- Removal and Installation of Options64
3 Copy Process91
- Expression of Colors and 4-Step Copy Process91
- General Description of Copying Process92
- Details of Copying Process93
- List of Copying Process Conditions104
4 General Operation107
- Overview of Operation107
- Description of Operation108
- Detection of Abnormality115
  - Types of Abnormality115
  - Description of Abnormality116
- Flow Chart121
  - Power on to Ready121
  - Automatic Feed Copying123
5 Control Panel127
- General Description127
- Items Shown on the Display Panel128
  - Display128
  - Message130
- Relation between the Equipment State and Operator's Operation135
- Description of Operation138
  - Dot Matrix LCD Circuit138
  - LED Display Circuit140
- Disassembly and Replacement141
6 Scanner145
- General Description145
- Construction146
- Functions147
- Control of Exposure Lamp (EXP)152
- General Description of CCD Control155
  - Opto-Electronic Conversion155
  - Shading Correction155
- Automatic Original Size Detection Circuit156
  - Principle of Original Size Detection156
  - Process of Detection of Original Size157
- Disassembly and Replacement161
7 Image Processing173
- General Description173
- Construction175
- System Control Pc Board (Sys)176
  - Features176
  - Functions of Image Processing Circuit176
- Logic Pc Board (Lgc)181
  - Features181
  - Functions of Image Processing Circuit181
8 Laser Optical Unit183
- General Description183
- Structure185
- Laser Diode189
- Laser Unit Cooling Fan190
- Polygonal Motor (M4)191
- Laser Driving PC Board (LDR)192
- Disassembly and Replacement193
9 Drive System195
- General Description195
- Main Motor (M6)196
  - Construction196
  - Drive Circuit of Main Motor197
- Transport Motor (M9)198
  - Construction198
  - Drive Circuit of Transport Motor199
- Developer Motor (M11)200
  - Construction200
  - Drive Circuit of Developer Motor202
- Disassembly and Replacement203
10 Paper Feeding System215
- General Descriptions215
- Construction216
- Functions217
- Description of Operation218
- Drive Circuit of Tray-Up Motor222
- Disassembly and Replacement223
11 Drum Related Section247
- General Description247
- Construction248
- Functions249
- Output Control Circuits of High-Voltage Transformer251
- Drum Temperature Detection Circuit252
- Temperature/Humidity Sensor (S19)253
  - General Description253
  - Construction253
- Charger Wire Cleaner254
- Disassembly and Replacement256
12 Developer Unit271
- General Description271
- Construction272
- Black Toner Cartridge Drive Unit273
  - General Descriptions273
  - Toner Motor (M3)273
- Black Developer Unit274
- Color Developer Unit279
- High-Voltage Transformer Output Control Circuit284
- Disassembly and Replacement285
13 Revolver Unit303
- General Description303
- Construction304
- Functions305
- Drive of Revolver Unit306
- Revolver Motor Drive Circuit307
- Operation308
- Disassembly and Replacement310
14 Transfer Unit317
- Outline of 1St Transfer321
- Outline of 2Nd Transfer322
- High-Voltage Transformer Output Control Circuit323
- Disassembly and Replacement324
15 Image Quality Control337
- General Description337
- Principle of the Sensor338
- Flow Chart of Control Procedure339
- Construction340
- Disassembly and Replacement341
16 Fuser Unit / Paper Exit Section343
- General Description343
- Construction344
- Functions345
- Operation347
- Heater Control Circuit348
- Control Circuit of Exit Motor360
- Disassembly and Replacement361
17 Automatic Duplexing Unit (Adu)379
- General Description379
- Construction380
- Functions381
- Drive of ADU382
- Description of Operations383
- Flow Chart388
- Disassembly and Replacement390
18 Power Supply Unit399
- Construction399
- Operation of DC Output Circuits400
- Output Channel401
- Fuse403
- Configuration of Power Supply Unit404
- Sequence of Power Supply405
- AC Wire Harness406
19 Pc Boards407

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Service Handbook678 pages

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Toshiba e-studio281c Specifications

General

Print Speed (Black)	28 ppm
Processor Speed	400 MHz
Copy Speed (Black)	28 cpm
Copy Resolution	600 x 600 dpi
Scan Resolution	600 x 600 dpi
Maximum Paper Size	A3
Connectivity	Ethernet, USB
Operating System Compatibility	Mac OS
Paper Size	A4, A5, Legal, Letter, Executive, Statement
Duplex Printing	Yes
Fax Transmission Speed	33.6 Kbps (optional)