User Manuals: Toshiba DP-7550 All-in-One Printer

Manuals and User Guides for Toshiba DP-7550 All-in-One Printer. We have 1 Toshiba DP-7550 All-in-One Printer manual available for free PDF download: Service Manual

Toshiba DP-7550 Service Manual

Toshiba DP-7550 Service Manual (404 pages)

MULTIFUNCTIONAL DIGITAL SYSTEMS

Brand: Toshiba | Category: All in One Printer | Size: 29 MB

Table of Contents

Service Manual
1
Table of Contents
11
1 Specifications/Accessories/Options/Supplies

17
- Specifications
  17
  - General
    17
  - Copy
    20
  - Print
    29
  - Scan
    29
  - E-Filing
    29
  - Internet Fax
    30
  - Network Fax
    31
- Accessories
  32
- Options
  33
- Supplies
  34
- System List
  35
2 Outline of the Machine

37
- Sectional View
  37
  - Front View
    37
  - Rear View
    40
- Electric Parts Layout
  43
- Symbols and Functions of Various Components
  67
  - Motors
    67
  - Sensors and Switches
    69
  - Electromagnetic Spring Clutches
    72
  - Solenoids
    73
  - PC Boards
    73
  - Lamps and Heaters
    74
  - Thermistors and Thermostats
    74
  - Transformer
    75
  - Others
    75
- System Block Diagram
  76
- Installation and Replacement of Covers
  77
- Removal and Installation of Options
  82
3 Copy Process

85
4 General Operation

97
- Overview of Operation
  97
- Description of Operation
  97
  - Warming-Up
    97
  - Ready State (Ready for Copying)
    98
  - Drawer Feed Copying with the [START] Button
    98
  - Bypass Feed Copying
    102
  - Interruption Copying
    102
- Detection of Abnormality
  103
  - Types of Abnormality
    103
  - Description of Abnormality
    103
5 Control Panel

107
- General Description
  107
- Items Shown on the Display Panel
  108
  - Display
    108
  - Message
    109
- Relation between the Equipment State and Operator's Operation
  114
- Description of Operation
  116
  - Dot Matrix LCD Circuit
    116
  - LED Display Circuit
    117
- Disassembly and Replacement
  118
6 Scanning Section

125
- Function
  125
- Construction
  126
- Operation
  127
  - Scanner Motor (M1)
    127
  - Two-Phase Motor Drive Circuit (Fixed-Current Type)
    128
- Control for Exposure Lamp
  129
  - General Description
    129
  - Exposure Lamp
    130
  - Control Circuit for Exposure Lamp
    131
- CCD Control
  132
  - Opto-Electronic Conversion
    132
  - Shading Correction
    132
- Automatic Original Size Detection Circuit
  133
  - Principle of Original Size Detection
    133
  - Process of Original Size Detection
    133
- Disassembly and Replacement
  137
7 Laser Optical Unit

149
- General Description
  149
- Structure
  152
  - Laser Optical Unit
    152
  - Polygonal Motor Unit
    154
  - Fθ Lenses 1 and 2
    156
  - H-Sync Detection PC Board (SNS Board)
    156
  - Laser Driving Board (LDR1/LDR2 Board)
    156
  - Slit Glass
    156
- Laser Diode Control Circuit
  157
- Polygonal Motor Control Circuit
  158
- Laser Unit Cooling Fan Control Circuit
  159
- Disassembly and Replacement
  160
8 Paper Feeding System

163
- General Description
  163
- Functions
  165
- Operation
  167
  - Operation of Bypass Pickup Roller
    167
  - Operation of Drawer Pickup Roller
    167
  - Paper Separation
    168
  - Driving
    169
  - General Operation
    170
  - Description of Tandem LCF Operation
    171
- Tray-Up Motor Control Circuit
  174
- Feed Motor Control Circuit
  175
- Transport Motor Control Circuit
  176
- Registration Motor Control Circuit
  177
- Tandem LCF Tray-Up Motor / End Fence Motor
  178
- Disassembly and Replacement
  179
9 Process Related Section

203
- Construction
  203
- Functions
  204
- Charger Wire Cleaner Control Circuit
  205
  - General Description
    205
  - Configuration
    205
- High-Voltage Transformer Control Circuit
  206
  - General Description
    206
  - Description of Operation
    207
- Drum Surface Potential Sensor Control Circuit
  208
  - General Description
    208
  - Configuration
    208
  - Description of Operation
    209
- Temperature/Humidity Detection Circuit
  210
  - Outline
    210
  - Construction
    210
- Disassembly and Replacement
  211
10 Drum/Cleaner Unit

219
- Construction
  219
- Functions
  220
- Drum Temperature Detection Circuit
  221
- Image Quality Control
  222
  - Outline
    222
  - Construction
    222
  - Principle of Image Quality Sensor
    223
  - Flow of Control
    223
- Drum Motor Control Circuit
  224
- Disassembly and Replacement
  225
11 Developer Unit

233
- Construction
  233
- Functions
  234
- Developer Unit Drive
  238
- Motor Control Circuit
  239
  - New Toner Supply Motor Control Circuit
    239
  - Developer Unit Motor Control Circuit
    240
- Auto-Toner Circuit
  241
  - General Description
    241
  - Operation of Auto-Toner Sensor
    243
- Disassembly and Replacement
  244
12 Transfer/Transport Unit

261
- General Description
  261
- Functions
  262
- General Description of Transfer Belt Unit Operation
  263
- Transfer Belt Motor Control Circuit
  264
- Disassembly and Replacement
  265
13 Fuser Unit

275
- Outline
  275
- Operation
  275
- Functions
  276
- Fuser Control Circuit
  277
  - Configuration
    277
  - Heating Principle of IH Coil
    278
  - IH Control Circuit Interface
    279
  - Abnormality in the IH Control Circuit
    279
  - Temperature Detection Section
    281
- Fuser Motor Control Circuit
  287
- Disassembly and Replacement
  289
14 Exit/Reverse Section

305
- General Description
  305
- Functions
  305
- Driving of Exit/Reverse Section
  306
- Operation
  306
- Exit Motor Control Circuit
  311
- Reverse Motor Control Circuit
  312
- Disassembly and Replacement
  313
15 Reversing Automatic Document Feeder (Radf)

319
- General Description
  319
- Functions
  320
- Description of Operation
  321
  - Paper Path
    321
  - Drive
    322
  - Original Size Detection
    323
- Electric Circuit Description
  326
  - Signal Block Diagram
    326
  - Electric Circuit Description
    327
- Disassembly and Replacement
  332
  - Radf
    332
  - RADF Front Cover
    333
  - RADF Rear Cover
    334
  - Original Jam Access Cover
    335
  - RADF Left Cover
    336
  - Original Tray
    336
  - Original Reverse Tray
    337
  - Platen Sheet Unit
    337
  - RADF Exit Tray
    338
  - Reading Start Guide Unit
    339
  - Exit Guide / Exit/Reverse Guide / Reading End Guide
    340
  - Paper Feeder Unit
    342
  - Pickup Roller
    343
  - Feed Roller
    344
  - Separation Roller
    345
  - Original Registration Roller
    346
  - Intermediate Transport Roller
    347
  - Reading Start Roller
    348
  - Reading End Roller
    350
  - Exit Roller
    351
  - Exit/Reverse Roller
    352
  - Exit Intermediate Roller
    353
  - Reverse Roller
    354
  - Original Feed Motor (MR1)
    356
  - Original Feed Motor Bracket
    356
  - Read Motor (MR2)
    357
  - Read Motor Bracket
    358
  - Original Reverse Motor (MR3)
    359
  - Original Exit Motor (MR4)
    359
  - RADF Cooling Fan (FR1)
    360
  - Original Pickup Solenoid (SOLR1)
    361
  - Original Reverse Solenoid (SOLR2)
    362
  - Original Exit Solenoid (SOLR3)
    363
  - Original Jam Access Cover Opening/Closing Switch (SWR1)
    364
  - RADF Opening/Closing Switch (SWR2)
    364
  - RADF Opening/Closing Sensor (SR15)
    366
  - Original Empty Sensor (SR3)
    366
  - Original Jam Access Cover Opening/Closing Sensor (SR13)
    367
  - Feeder Lower Guide Unit
    367
  - Original Width Detection Sensor-3 (SR8)
    368
  - Original Width Detection Sensor-2 (SR7)
    368
  - Original Width Detection Sensor-1 (SR6)
    369
  - Original Registration Sensor (SR5)
    369
  - Original Exit Sensor (SR12)
    369
  - Original Tray Sensor (SR1)
    370
  - Original Tray Width Sensor (SR2)
    371
  - Original Exit/Reverse Sensor (SR11)
    372
  - Original Reverse Unit Opening/Closing Sensor (SR14)
    373
  - Original Reading End Sensor (SR4)
    374
  - Original Intermediate Transport Sensor (SR9)
    374
  - Original Reading Start Sensor (SR10)
    374
  - Original Reading Start Sensor (Prism)
    375
  - RADF Board (RADF)
    376
  - RADF Board Bracket
    376
  - Harness Guide
    377
16 Power Supply Unit

379
- Construction
  379
- Operation of DC Output Circuit
  380
- Output Channel
  382
- Fuse
  384
- Configuration of Power Supply Unit
  386
- AC Wire Harness
  387
17 Pc Boards

389
18 External Counters

397
- Outline
  397
- Signal
  397
- Notices
  400

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