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CHAPTER 4 IMAGE FORMATION SYSTEM
COPYRIGHT
©
1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
4-11
E. Controlling the Developing/Separation Static Eliminator Bias
1. Outline
The circuit shown in Figure 4-107 is used to control the voltage applied to the developing
assembly and the separation static eliminator, and has the following functions:
• Turning on and off the developing DC bias
• Turning on and off the AC bias (turning on and off the static eliminator bias)
• Controlling the voltage level of the developing DC bias
Both AC bias and DC bias are applied to the developing cylinder while copies are being made.
When the photosensitive drum rotates and yet developing is not under way, about -500 VDC is
applied to the developing cylinder regardless of the position of the density adjusting lever, thereby
preventing adhesion of excess toner on the photosensitive drum.
Reference :
Developing DC bias : -80 ~ -550V
Developing AC bias : 1200Vpp ± 10%
- FY8-13GA-000 1
- COPYRIGHT © 1999 CANON INC 2
- Printed in Japan 2
- Imprimé au Japon 2
- INTRODUCTION 3
- CONTENTS 7
- CHAPTER 6 FIXING SYSTEM 8
- CHAPTER 9 INSTALLATION 9
- CHAPTER 8 ADF 9
- APPENDIX 10
- CHAPTER 11 TROUBLESHOOTING 10
- CHAPTER 1 11
- GENERAL DESCRIPTION 11
- I. FEATURES 13
- II. SPECIFICATIONS 14
- 3. Performance 15
- Table 1-203 15
- 4. Others 17
- Table 1-204 17
- *1. 250-sheet cassette type 17
- *2. 500-sheet cassette type 17
- 5. Default Ratios 18
- Table 1-205 18
- Table 1-207 20
- III. NAMES OF PARTS 22
- B. Cross Section 25
- [6][5][4][3][2][1] 26
- [13] [12] 26
- [11] [9] [8] [7][10] 26
- [8] [9][7][6][1] 27
- [15] [14] [12] [10][11][13] 27
- [5][4][3][2] 27
- Table 1-401 28
- VI. IMAGE FORMATION 32
- CHAPTER 2 35
- BASIC OPERATION 35
- Manual feed block 37
- CHAPTER 2 BASIC OPERATION 38
- Figure 2-103 39
- Table 2-101 40
- Figure 2-105 43
- Figure 2-106 44
- (220/240V model only) 45
- Figure 2-108 46
- Figure 2-109 47
- CHAPTER 3 49
- EXPOSURE SYSTEM 49
- CHAPTER 3 EXPOSURE SYSTEM 52
- C. Lens Drive System 53
- D. Scanner Drive System 54
- II. EXPOSURE SYSTEM 59
- A. Scanner Drive Assembly 63
- Figure 3-306 66
- Figure 3-311 69
- Top View 70
- Figure 3-329 77
- B. Lens Drive Assembly 81
- C. Exposure System 87
- CHAPTER 4 93
- IMAGE FORMATION SYSTEM 93
- I. IMAGE FORMATION SYSTEM 95
- Figure 4-101 96
- Figure 4-102 97
- Figure 4-103 99
- COPYRIGHT 100
- Figure 4-107 106
- Microprocessor 110
- II. DISASSEMBLY/ASSEMBLY 116
- A. Cartridge 117
- B. Transfer Charging 119
- Assembly 119
- C. Blank Exposure 120
- Lamp PCBs 121
- CHAPTER 5 123
- PICK-UP/FEEDING SYSTEM 123
- I. PICKUP/FEEDING SYSTEM 125
- Pickup clutch solenoid 128
- INTR SCFW SCRV LSTR STBY 129
- 0.7sec (approx.) 129
- SCFW SCRV SCFW SCFWSCRV 132
- 19th copy 132
- D. Detecting Jams 136
- STBY INTR SCFW 138
- No paper 138
- Jam check 141
- Delivery sensor (PS3) 141
- Main motor (M1) 141
- A. Pickup Assembly 143
- Hex wrench 145
- Pickup roller shaft 145
- Pickup gear unit 145
- [4] [4][5] 149
- Figure 5-218 151
- B. Multifeeder Assembly 152
- [2] [1] [1] [3] 153
- C. Single-feeder Assembly 155
- Figure 5-229 156
- D. Feeding Assembly 157
- E. Registration Roller 158
- F. Delivery Assembly 160
- CHAPTER 6 163
- FIXING SYSTEM 163
- I. OPERATIONS 165
- Figure 6-101 166
- Figure 6-102 166
- CHAPTER 6 FIXING SYSTEM 167
- Figure 6-104 169
- Table 6-102 169
- A. Fixing Assembly 175
- CHAPTER 7 179
- Figure 7-101 181
- II. POWER SUPPLY SYSTEM 183
- B. Power Supply Circuit 184
- Figure 7-202 185
- III. DISASSEMBLY/ASSEMBLY 187
- A. External Covers 188
- Figure 7-308 192
- Lighter Darker 195
- Auto Exposure 195
- Manual Exposure 195
- Timer Saver 195
- C. Copyboard Glass 196
- D. Main Motor/Main Drive 197
- E. Electrical System 201
- Figure 7-330 203
- CHAPTER 8 205
- A. Outline 207
- B Basic Construction 208
- Figure 8-103 209
- C. Basic Operations 210
- CHAPTER 8 ADF 211
- Original detection 212
- Registration paper 213
- 1st original 214
- Separation pad 214
- Pickup roller 1 214
- Pickup roller 2 214
- Registration roller 214
- Delivery sensor 215
- Feeding belt 215
- Pickig up 217
- Feeding 1 217
- 2nd original 218
- Figure 8-120 219
- Figure 8-119 219
- H. Controlling the Belt Motor 221
- I. Detecting Original Jams 222
- J. Power Supply 223
- A. Removing the ADF 225
- B. External Covers 227
- C. Drive System 229
- Figure 8-215 231
- D. Feeding System 232
- Figure 8-219 233
- CHAPTER 9 241
- INSTALLATION 241
- I. SELECTING A SITE 243
- Shipping attachment [1] 244
- Shipping attachment [2] 245
- Protective sheet 246
- CHAPTER 9 INSTALLATION 247
- Original tray 248
- Rear end guide plate 251
- Shift down, and pull off 251
- • 500-sheet cassette 253
- • 250-sheet cassette 253
- III. MOVING THE MACHINE 254
- CHAPTER 10 257
- MAINTENANCE AND SERVICING 257
- II. DURABLES AND CONSUMABLES 258
- III. SCHEDULED SERVICING 258
- CHAPTER 11 264
- TROUBLESHOOTING 264
- CHAPTER 11 TROUBLESHOOTING 266
- I. MAINTENANCE AND INSPECTION 268
- 2.0 ± 1.5mm 270
- 2.5 ± 1.5mm 271
- Figure 11-207 (rear) 273
- Figure 11-208 (front) 273
- 1 mirror mount [1] 274
- Figure 11-209 (rear) 274
- Figure 11-210 (front) 274
- Figure 11-212 276
- Figure 11-217 279
- Face without a marking 285
- [3] [13] 288
- Figure 11-235 289
- Figure 11-238 (rear) 291
- Figure 11-239 (front) 291
- No. 1 mirror mount [1] 292
- Figure 11-240 (rear) 292
- Figure 11-241 (front) 292
- A4/LTR copy papper 295
- Copy image 298
- L3=10 ± 2.5mm 298
- L4=10 ± 2.0mm 301
- C. Electrical 306
- J101J131 307
- A. Making Initial Checks 313
- 319
- 21 The copy is blank 324
- 22 The copy is solid black 325
- 4 E002, E003 328
- 14 AC power fails to turn on 332
- 15 DC power fails to turn on 333
- 16 Pickup fails. (cassette) 334
- 23 The lens fails to turn on 338
- [3] [2] [1] 340
- 1 Pickup Assembly 341
- 2 Separation/Feeding Assembly 342
- 3 Fixing/Delivery Assembly 342
- B. Faulty Feeding 343
- ELECTRICAL PARTS 344
- B. Switches 345
- C. Lamp, Heater, Motor, Etc 346
- Figure 11-604 347
- Figure 11-605 348
- VII. SELF DIAGNOSIS 351
- ( ) 352
- A. GENERAL TIMING CHART 356
- Preparing for 357
- B. SIGNALS AND ABBREVIATIONS 358
- C. GENERAL CIRCUIT DIAGRAM 360
- ADF CONTROLLER PCB 361
- H. AE SENSOR CIRCUIT DIAGRAM 384
- I. SENSOR CIRCUIT DIAGRAM 385
- N. SPECIAL TOOLS 390
- O. SOLVENTS/OILS 391
- This pubication is printed on 393
- 70% reprocessed paper 393
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