Canon GP160 Service Manual Page 82
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COPYRIGHT
©
1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE PROCESSING SYSTEM
4-8
E. Logarithmic correction
The CCD output has linear characteristics with regards to the reflected light from the
document, however, the density seen by the eye when looking at a document is not lin-
ear in relation to reflected light.
Figure 4-305 shows the relationship between the document density seen by the eye,
and that of the CCD output.
In order to correct this, the level is adjusted, using the correction curve shown in
Figure 4-306.
Figure 4-305 Figure 4-306
25
0
Black White
CCD output
Document density
25
0
025
Output level
Input level
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- GP160F/160DF/160 1
- Printed in Japan 2
- Imprimé au Japon 2
- CONTENTS 7
- APPENDIX 10
- CHAPTER 13 TROUBLESHOOTING 10
- CHAPTER 1 11
- INTRODUCTION 11
- I. FEATURES 13
- II. SPECIFICATIONS 14
- CHAPTER 1 INTRODUCTION 15
- 4. Other 16
- 5. Copy speed 17
- III.NAMES OF PARTS 18
- B. Cross sectional diagram 20
- IV.OPERATION EXPLANATION 22
- Spealer volume switch 24
- B. Basic operation 25
- C. Advanced features 25
- D. User mode 26
- Figure 1-404 27
- Figure 1-405 28
- Figure 1-406 29
- Figure 1-407 30
- Figure 1-408 31
- Figure 1-409 32
- Figure 1-410 33
- Figure 1-411 34
- Figure 1-412 35
- Figure 1-413 36
- Figure 1-414 37
- Figure 1-415 38
- Figure 1-416 39
- Figure 1-417 40
- Figure 1-418 41
- Figure 1-419 42
- Figure 1-420 43
- THE USER 44
- VI. SAFETY 45
- SUBCHAPTER J 46
- B. Toner safety 48
- VII. COPYING PROCESS 49
- + + + + + + + + + 50
- CHAPTER 2 51
- BASIC OPERATION 51
- I. BASIC OPERATION 53
- B. Copy operation overview 54
- CHAPTER 2 BASIC OPERATION 55
- General timing chart 56
- IV. MAIN MOTOR 57
- Figure 2-501 58
- Figure 2-502 59
- Figure 2-503 60
- Figure 2-504 61
- Figure 2-505 62
- CHAPTER 3 63
- EXPOSURE SYSTEM 63
- I. OPERATION OVERVIEW 65
- B. Exposure system sequence 66
- II. SCANNER DRIVE SYSTEM 67
- C. Scanning lamp control 68
- A. Scanning lamp 70
- CHAPTER 3 EXPOSURE SYSTEM 71
- B. Document scanning 72
- CHAPTER 4 73
- IMAGE PROCESSING SYSTEM 73
- II. ANALOG IMAGE PROCESSING 76
- III.DIGITAL IMAGE PROCESSING 78
- B. Shading correction 79
- E. Logarithmic correction 82
- G. Binarisation 83
- IV. DISASSEMBLY, ASSEMBLY 84
- A. CCD unit 85
- CHAPTER 5 87
- LASER EXPOSURE SYSTEM 87
- II. BD SIGNAL GENERATION 91
- III.LASER DRIVER CIRCUIT 92
- Figure 5-301 93
- A. Operation outline 94
- A. Laser scanner unit 96
- CHAPTER 6 97
- IMAGE FORMATION SYSTEM 97
- Figure 6-102 100
- A. Outline 101
- B. Control operation 101
- A. Overview 102
- B. Bias control 103
- A. Operation 104
- DC bias 105
- VI. RE-CHARGE BIAS CONTROL 106
- [2] TNRCHKT 107
- [1] TNRCHKD 107
- CHAPTER 7 109
- PICK-UP / FEEDING SYSTEM 109
- I. OVERVIEW 111
- II. PICK-UP FEEDING OPERATION 112
- A. Pick-up operation 113
- Figure 7-302 114
- 3.0 sec 115
- 3.0 sec. 3.0 sec 115
- C. Paper size detection 116
- IV. MULTI-FEEDER PICK-UP 117
- COPYRIGHT 118
- C. Multi-feeder retry pick-up 119
- Figure 7-403 121
- V. PAPER FEEDING OPERATION 122
- VI. JAM DETECTION 123
- B. Types of Jam 124
- C. Jam sequence 124
- 2.3 sec 125
- 2.0 sec 126
- 1.0 sec 129
- 1.2 sec 130
- VII. DISASSEMBLY, ASSEMBLY 133
- A. Cassette feeding assembly 134
- B. Multi-feeder assembly 140
- C. Registration roller assem 143
- Figure 7-723 144
- D. Feeder assembly 145
- CHAPTER 8 147
- FIXING SYSTEM 147
- I. OPERATIONAL OVERVIEW 149
- Figure 8-102 150
- Print temperature 151
- Page interval 151
- CHAPTER 8 FIXING SYSTEM 152
- III.DISASSEMBLY, ASSEMBLY 154
- A. Removing the fixing 155
- CHAPTER 9 157
- I. CONTROL PANEL 159
- II. POWER SUPPLY 160
- Figure 9-201 161
- A. Rotation control mechanism 165
- IV.BACK-UP BATTERY 166
- Caution: 167
- B. Back-up Data 170
- Table 9-408 173
- V. DISASSEMBLY, ASSEMBLY 174
- A. Control panel 175
- Figure 9-504 176
- B. Main Motor 177
- Printer unit 179
- Yellow rollers 180
- Main motor 182
- C. DC controller PCB 183
- D. Image processor PCB 184
- E. DC power supply PCB 185
- CHAPTER 10 187
- CASSETTE FEEDER 187
- CHAPTER 10 CASSETTE FEEDER 190
- Figure 10-301 192
- IV.OPERATION OVERVIEW 193
- B. Basic Sequence 194
- V. FEEDER MOTOR CONTROL 195
- B. Jam Sensing 197
- A. Removing the feeder 200
- B. Removing the pick-up/ 200
- C. Removing the pick-up unit 202
- CHAPTER 11 205
- INSTALLATION 205
- CHAPTER 11 INSTALLATION 207
- 160cm or more 208
- 10 cm or more 208
- Paper lifting plate 210
- Tie-wrap 210
- Mirror mount fixing screw 211
- Screw storage 211
- Light-blocking shutter 212
- (Do not open) 212
- Protective sheet 212
- Paper size sensor lever 215
- Paper set label 216
- Multi-feeder 217
- Paper width guide 217
- Auxiliary tray 217
- Hold the handle 217
- Document 218
- Delivery tray 218
- Power cord 218
- SERVICE MODE 219
- # 1 SSSW 219
- # 8 CLEAR 219
- SELECT AN ITEM 220
- 01 DATA REGISTRATION 220
- 02 TEL# REGISTRATION 220
- REGISTRATION/SETTING 220
- TEL LINE TYPE 221
- # 2 MENU 222
- CHAPTER 12 223
- MAINTENANCE AND INSPECTION 223
- I. PERIODIC REPLACEMENT PARTS 225
- Table 12-301 226
- CHAPTER 13 233
- TROUBLESHOOTING 233
- Hex wrench 236
- Precision screwdriver (3mm) 237
- 3.5 ± 0.5mm 241
- Figure 13-111 242
- Table 13-101 242
- B. Electrical System 243
- (Image facing down) 244
- Table 13-102 245
- DS of DES of DOC A4 246
- CRG on DCVS on 246
- Figure 13-117 247
- MEASURES 249
- 1 Too Light 252
- 2 Too Dark 253
- 4 Solid black 255
- 5 Polka dots 255
- 6 Soiled back 256
- 8 Vertical Fogging 257
- 11 White Strips (vertical) 258
- 13 Leading Edge Displacement 258
- 14 Blurring 259
- 1 No power 260
- 9 Speaker does not operate 265
- B. Copy paper jam 269
- 2 Feeder assembly 271
- 3 Fixing/Delivery Area 271
- C. Faulty feeding 272
- A. Clutches, solenoids 274
- Clutch, solenoid types 275
- Table 13-401 275
- B. Motor, fan 276
- Motors, fans 277
- Table 13-402 277
- C. Sensors 278
- Table 13-403 279
- Figure 13-404 280
- Table 13-404 281
- Figure 13-405 282
- Table 13-405 283
- ■ DC power supply PCB 287
- Figure 13-409 287
- Figure 13-410 288
- V. SERVICE MODE 289
- B. Operating Procedures 290
- C. Service mode menu list 291
- Figure 13-503 292
- Figure 13-504 293
- (type setting) 294
- (NCU settings) 294
- (scanner function settings) 295
- (printer function settings) 295
- Figure 13-507 296
- D. SSSW Default Setting 297
- SSSW Default Setting 298
- E. Parameter settings 312
- Table 13-510 322
- Warning: 343
- F. Test Mode (TEST MODE) 345
- Figure 13-510 347
- Figure 13-511 348
- Figure 13-512 349
- Figure 13-513 350
- Figure 13-514 351
- Figure 13-515 352
- Precision screwdriver 355
- Print pattern 355
- Figure 13-523 362
- Figure 13-526 365
- P.0001/0025 370
- 6-4 : ADF 370
- Number of documents fed 370
- VI. REPORTS 376
- B. Service report 379
- Figure 13-602 380
- Figure 13-603 381
- Figure 13-604 382
- Figure 13-605 383
- Figure 13-606 384
- Figure 13-607 385
- Figure 13-608 386
- Figure 13-609 387
- Figure 13-610 388
- Figure 13-611 389
- Figure 13-612 390
- Figure 13-613 391
- Figure 13-615 393
- VII. USER ERRORS 397
- VIII. SERVICE ERRORS 404
- Paper interval bias 433
- B. SIGNALS AND ABBREVIATIONS 435
- C. GENERAL CIRCUIT DIAGRAM 437
- Image processor PCB (2/3) 438
- Image processor PCB 438
- Image processor PCB (3/3) 439
- II. DC controller PCB 440
- DC controller PCB (2/2) 441
- Sensor PCB 441
- DC controller PCB 441
- III. Cassette Feeder 442
- D LIST OF SPECIAL TOOLS 443
- E. SOLVENTS AND OILS 444
- 70% reprocessed paper 446
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