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Trademark Acknowledgments
Microsoft Windows, MS-DOS, Windows NT, Windows 2000 are trademarks of Microsoft
Corporation in the U. S. A. and other countries.
Macintosh, Power Macintosh, Mac OS, LaserWriter, and AppleTalk are registered trademarks of
Apple Computer, Inc.
IBM, PC/ AT, and PowerPC are trademarks of International Business Machines Corporation.
Pentium is a registered trademark of Intel Corporation.
PCL is a trademark of the Hewlett- Packard Company.
PostScript is a registered trademark of Adobe Systems Incorporated.
NetWare is a registered trademark of Novell, Inc.
All other trademarks and copyrights are the property of their respective owners.
SHARP CORPORATION
Digital Document System Group
Products Quality Assurance Department
Yamatokoriyama, Nara 639-1186, Japan
2002 July Printed
- SERVICE MANUAL 1
- CONTENTS 4
- 1. SPECIFICATIONS 6
- 1.1.2. Basic specifications 7
- C. Original 8
- D. Paper 8
- E. Paper feed 9
- F. Continuous copy 9
- G. Density adjustment 9
- H. Picture quality mode 9
- I. Magnification ratio 9
- J. Counter display 10
- K. Charger wire cleaning 11
- L. Special functions 11
- M. Edit functions 13
- N. Tab paper 13
- O. Digital edit function 13
- P. Operation panel 14
- Q. Environmental conditions 14
- R. Noises 15
- S. Complying standards 15
- T. Power source 15
- U. External view 15
- V. Packing 15
- W. Maintenance 16
- X. Automatic document feeder 16
- Y. Automatic duplex unit 16
- Z. Tandem LCF 17
- A. Image quality 17
- 1.2. Accessories 18
- 1.3. Options 18
- 1.4. Supplies 19
- 1.5. System List 20
- 2. 1. Sectional View 21
- 2. 2. Electric Parts Layout 25
- (B-3) PC board 27
- (B-4) Other parts 27
- Rear side 27
- [C] Laser unit 28
- [D] Transfer/Transport unit 28
- [E] Fuser unit 29
- [F] Copier unit 30
- (F-1) Motor/Fan 30
- (F-2) Clutch/Solenoid 31
- (F-3) Sensor/Switch 32
- (F-4) PC board 33
- (F-5) Other parts 34
- (1) Motors 36
- (2) Sensors and switches 38
- (4) PC boards 41
- (7) Transformer 42
- (5) Heaters and lamps 42
- (6) Solenoid 42
- (8) Others 43
- 2. 5. System Block Layout 46
- 2. 6. 1. Covers 47
- Left top cover 48
- Right top cover 48
- 2. 6. 2. PC boards 49
- 3. COPY PROCESS 51
- Surface potential (V) 52
- Type of originals 56
- Aluminum conductive base 57
- OPC layer 57
- 4. 2. 1. Warming-up 62
- Forward rotation 65
- Reverse rotation 65
- 4. 2. 4. Bypass copying 66
- 4. 2. 5. Interrupt copying 66
- 4. 3. Abnormality Detection 67
- 0.975sec 70
- 4. 4. 1. Power ON to ready 72
- Paper jam 75
- Drum reversed 75
- 5. CONTROL PANEL 76
- Fig. 5.2-1 79
- Fig. 5.2-2 79
- LCD PANEL 83
- 320 x 240 DOTS 83
- 5. 4. 2. LED display circuit 85
- MKEY board 87
- SKEY board 87
- LCD panel 87
- 6. SCANNING SECTION 88
- 6. 2. Construction 89
- 6. 3. 1. Scanner motor 91
- 6. 4. 1. General description 94
- 6. 4. 2. Exposure lamp 95
- Xenon lamp 96
- Xenon lamp 96
- 7497 7498 7499 7500 97
- Reflection type 98
- [A4 Series] 99
- [LT Series] 99
- Original 101
- Phototransistor 101
- Semi 102
- conductive 102
- 7. 2. 1. General description 103
- 7. 2. 2. Configuration 104
- 7. 3. 1. Features 105
- 0123456789 0123456789 106
- 7. 4. 1. Features 108
- 7. 5. Scanning Section 109
- 7. 6. Writing Section 109
- 8. LASER & OPTICAL UNIT 110
- >PS< 112
- 8. 3. Laser Diode 116
- Laser fan motor 117
- Connector 117
- 9. PAPER FEEDING SECTION 119
- 9. 3. Operation 122
- 9. 3. 3. Paper separation 123
- 9. 3. 4. General operation 124
- 1 2 3 4 5 6 7 128
- IN1 IN2 M(+) GND M(–) N.C. V 128
- Feed roller 130
- Separation roller 130
- Standby side empty sensor 142
- 10. PROCESS SECTION 144
- 10. 2. Functions 145
- 10. 4. 2. Operation 147
- J347-2 HVTVR 148
- J347-8 HVDVR 148
- J347-5 HVMVR 148
- 10. 5. 2. Construction 149
- 10. 5. 3. Control method 149
- Temperature/humidity sensor 154
- Surface potential sensor 154
- Duct out fan 155
- Exit fan 155
- 11. DRUM/CLEANER UNIT 156
- 11. 2. Functions 157
- Light emitting element 158
- Light sensing element 158
- 11. 4. 3. Outline of control 159
- 11. 4. 4. Construction 160
- Cleaner top cover 162
- Foot of screw 162
- E-ring Cam 164
- Separation finger 164
- Drum wheel 165
- Drum motor 165
- 12. DEVELOPER UNIT 166
- 12. 2. Functions 167
- 12. 3. Developer Unit Drive 169
- Developer unit drive 170
- 12. 4. Motor Drive Circuit 171
- 12. 4. 2. Developer motor 172
- 13. TRANSFER/TRANSPORT UNIT 187
- 13. 3. Functions 188
- Cam Lever 190
- 14. FUSER UNIT 197
- 14. 3. Functions 198
- 14. 4. 1. Configuration 200
- Photocoupler 201
- Thermistor 206
- Main CPU 206
- M/DC-HTR-340N 207
- 14. 5. 2. Control signals 208
- Upper separation finger 213
- Lower separation finger 213
- Entrance lower guide unit 214
- Cleaning roller (felt) 214
- Exit roller 214
- 2.0~2.5mm 215
- 15. EXIT/REVERSING UNIT 218
- E-ring Bearing 225
- 16. RADF (DOCUMENT FEEDER) 226
- 16. 2. Construction 227
- 16. 3. Drive System 228
- 16. 4. Signal Block Diagram 231
- 16. 5. Operations 232
- 16. 6. Jams 257
- 16. 7. Errors 262
- A4 series 264
- LT series 265
- 16. 9. Flow Chart 266
- (2) Rewriting of flash ROM 267
- (4) Initialization 269
- (5) Control for separation 270
- 16. 10. Timing Chart 282
- 16. 11. Circuits 287
- 16. 12. Input/Output Signals 293
- ADF front cover 298
- ADF rear cover 298
- Tray lift motor 302
- Read motor 302
- Tension spring 302
- Original length sensor 306
- Cover open/close switch 306
- Back cover 306
- Tray sensor 306
- RADF open/close switch 308
- Blue Orange Brown 308
- Scanning guide 308
- Large original exit guide 308
- Intermediate transport sensor 308
- Large original exit sensor 309
- Read sensor 309
- Upper transport guide 309
- Registration sensor 309
- Original width sensor 309
- Platen guide 310
- 17. POWER SUPPLY UNIT 317
- 17. 3. Output Channel 318
- 17. 4. Fuse 321
- 17. 6. Power Supply Sequence 324
- 18. PRINTED WIRING BOARDS 325
- (2) PWA-F-LGC-340 326
- (3) PWA-F-SLG-340 327
- (4) PWA-F-PLG-340 328
- (5) PWA-F-CCD2-340 329
- (6) PWA-F-LDR-340 330
- (7) PWA-F-SNS-340 330
- (8) PWA-F-MOT-340 330
- (9) PWA-F-MOT2-340 331
- (Japan only) 332
- Trademark Acknowledgments 342
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