Toshiba e-studio281c

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TRANSFER UNIT

14 - 4

13)2nd transfer roller position detection sensor (S18)

This sensor is a photointerrupter detecting whether the 2nd transfer roller is at its contacting position

or releasing position.

Main Page

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

Toshiba e-studio281c - Page 320

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