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2.18 ABNORMAL CONDITION IN TONER DENSITY DETECTION
- Phenomenon -
The Auto ID indicator or the selected manual ID level blinks. (No SC Code is
indicated.)
- Definition -
If the Vsg goes below 2.5 volts or Vsp goes above 7.5 volts 5 times in a row.
- Possible Causes -
• Incorrect Vsg voltage
• Dirty ID sensor
• Low toner density
• ID sensor defect
• Main board defect
- Action -
Check the Vsg voltage displayed in the magnification indicator by SP Mode
#55.
5.00 0.00 (Vsg ≤ 2.5 volts)
Is the copy image too light?
No Yes
Refer to Light Copy section.
Is the ID sensor circuit open?
No Yes
Replace the ID sensor and adjust the Vsg to 4.02 ± 0.2 volts.
Replace the main board and adjust the Vsg to 4.02 ± 0.2 volts.
Is the ID sensor surface dirty with toner?
No Yes
Clean the ID sensor with blower brush and/or damp cloth, then
check and/or adjust the Vsg to 4.0 ± 0.2 volts. If toner scattering
occur, correct it. (Refer to Toner Scattering section.)
1 December 1990
6-51
- SECTION 1 2
- OVERALL MACHINE 2
- INFORMATION 2
- 1. SPECIFICATIONS 3
- 1 December 1990 10
- 4. FUNCTIONAL OPERATION 14
- 6. DRIVE LAYOUT 16
- Magnetic Clutch 20
- Solenoid 20
- Printed Circuit Board 22
- Power Packs 22
- Transformer 23
- 9. OVERALL MACHINE CONTROL 24
- 10. AC POWER AND DC POWER 25
- DISTRIBUTION 25
- 10.1 AC POWER DISTRIBUTION 27
- 10.2 DC POWER DISTRIBUTION 28
- SECTION 2 29
- SECTIONAL DESCRIPTION 29
- 1.1 OPC DRUM CHARACTERISTICS 30
- 1.2 DRUM UNIT 31
- 1.3 HANDLING THE DRUM 32
- 2. DRUM CHARGE 33
- 2.3 CHARGE CORONA CIRCUIT 35
- 2.4 GRID VOLTAGE CORRECTION 36
- ±0 (volts) 37
- 3. OPTICS 38
- 3.2 SCANNER DRIVE 39
- 3.3 LENS DRIVE 40
- 3.4 4TH AND 5TH MIRROR DRIVE 42
- Main Board (PCB1) 43
- Sampled area 45
- Main Motor On Time 49
- 3.9 SERVICE CALL CONDITIONS 51
- 4. ERASE 52
- 5. DEVELOPMENT 55
- 5.2 DRIVE MECHANISM 56
- 5.3 CROSS-MIXING 57
- Darker Lighter 58
- ±0 volts 60
- 5.5 DEVELOPMENT BIAS CIRCUIT 61
- SUPPLY 64
- I/D Sensor 65
- Toner Supply 65
- CL Solenoid 65
- 6.3 FIXED SUPPLY MODE 66
- DETECTION 68
- 6.8 TONER SUPPLY AMOUNT 71
- 6.9 TONER END DETECTION 75
- 7. IMAGE TRANSFER AND PAPER 77
- SEPARATION 77
- 7.3 PAPER SEPARATION 78
- CORONA CIRCUIT 79
- 8. DRUM CLEANING 80
- 8.2 DRIVE MECHANISM 81
- 8.3 TONER OVERFLOW DETECTION 82
- 9. QUENCHING 83
- 10.1 OVERVIEW 84
- 10.2 FRR FEED SYSTEM 85
- PAPER END DETECTION 87
- 10.5 PAPER SIZE DETECTION 90
- 10.7 SLIP CLUTCH MECHANISM 95
- 10.8 MANUAL FEED TABLE 96
- 10.9 PAPER REGISTRATION 97
- 11. IMAGE FUSING 99
- SAFETY SWITCH 100
- 11.3 FUSING LAMP CONTROL 101
- 11.5 SERVICE CALL CONDITIONS 105
- SECTION 3 106
- INSTALLATION 106
- 1. INSTALLATION REQUIREMENTS 107
- 1.2 MACHINE LEVEL 108
- 1.4 POWER REQUIREMENTS 109
- 2. INSTALLATION PROCEDURE 110
- 2.2 220/240V CONVERSION 116
- 2.3 CASSETTE MODIFICATION 117
- (OPTION) 119
- SECTION 4 128
- SERVICE TABLES 128
- 1. SERVICE TABLES 129
- 1.2 DIP SWITCHES 130
- 1.3 VARIABLE RESISTORS 133
- 2. SERVICE PROGRAM MODE 135
- 2.1.4 Others 138
- #52, #55, and #59 138
- *5: Exposure 139
- *6: Jam Detection 139
- *11: All Indicators 139
- *48: Light Intensity 143
- *52: Fusing 143
- *55: Vsg & Vsp 144
- *59: Bias Voltage 144
- *79: Color Bias 146
- Optics Cavity 153
- 2.5 MISFEED TABLE 156
- SERVICE CALL CODE 160
- 3. SERVICE REMARKS 162
- 3.3 CHARGE CORONA 163
- 3.4 OPTICS 163
- 3.5 DEVELOPMENT UNIT 164
- 3.6 TONER SUPPLY 165
- 3.7 TRANSFER AND SEPARATION 165
- 3.8 CLEANING UNIT 165
- 3.9 FUSING UNIT 166
- 3.10 PAPER FEED 166
- 3.11 DOCUMENT FEEDER 166
- 3.12 SORTER 166
- 3.13 DUPLEX 167
- 3.14 OTHERS 167
- ± 0.1V by turning VR101 169
- ± 0.2V by turning VR102 169
- 5.1 PM TABLE 170
- 5.2 EXPLANATION OF REGULAR PM 174
- SECTION 5 176
- REPLACEMENT AND ADJUSTMENT 176
- 1. EXTERIOR AND INNER COVERS 177
- 1.2 INNER COVER REMOVAL 180
- 2. OPTICS 181
- 2.2 1ST MIRROR REMOVAL 182
- 2.5 EXPOSURE LAMP REPLACEMENT 187
- 2.6 THERMOSWITCH REPLACEMENT 189
- 2.8 SCANNER MOTOR REPLACEMENT 197
- REPLACEMENT 200
- (HORIZONTAL DIRECTION) 201
- 3.1 TONER TANK REMOVAL 202
- 3.2 DEVELOPER REPLACEMENT 203
- 3.3 INLET SEAL REMOVAL 204
- 3.5 DOCTOR GAP ADJUSTMENT 206
- REPLACEMENT 210
- 4. CLEANING 212
- 4.4 BLADE SCRAPER REPLACEMENT 215
- 4.6 USED TONER COLLECTION 217
- 4.7 ENTRANCE SEAL REPLACEMENT 218
- 5. PAPER FEED 219
- ROLLER REPLACEMENT 221
- 6. AROUND DRUM 237
- 6.3 ERASE LAMP REPLACEMENT 239
- 6.8 DRUM REPLACEMENT 244
- 6.9 ID SENSOR REPLACEMENT 246
- 7. FUSING 255
- 7.2 FUSING LAMP REPLACEMENT 256
- 7.4 HOT ROLLER REPLACEMENT 259
- 8. OTHERS 264
- 8.2 OZONE FILTER REPLACEMENT 265
- 9. COPY QUALITY ADJUSTMENT 266
- 9.3 BIAS VOLTAGE ADJUSTMENT 269
- 9.4 TONER DENSITY ADJUSTMENT 270
- • Main board 272
- • AC drive board 272
- 9.11 FOCUS ADJUSTMENT 274
- 9.12 ERASE MARGIN ADJUSTMENT 275
- 9.13 REGISTRATION ADJUSTMENT 275
- SECTION 6 280
- TROUBLESHOOTING 280
- 1. COPY QUALITY 281
- 2. SERVICE CALL CONDITION 304
- Not Open 315
- Replace the sensor 315
- Replace the main board 315
- 3.1 SENSOR 333
- 3.3 FUSE 336
- SECTION 8 337
- DOCUMENT FEEDER 337
- 2. COMPONENT LAYOUT 339
- 4. OVERALL MACHINE CONTROL 341
- → Copier 342
- 5. BASIC OPERATION 343
- 6. POWER DISTRIBUTION 345
- 7. INTERFACE CIRCUIT 346
- 8. ORIGINAL FEED 347
- 8.2 ORIGINAL SEPARATION 348
- 8.4 ORIGINAL SIZE DETECTION 351
- 8.7 BELT DRIVE MOTOR CIRCUIT 355
- 8.8 FEED-OUT MOTOR CIRCUIT 356
- DF Main Board (PCB1) 357
- 9. LIFT MECHANISM 358
- Code: A048) 361
- 11.2 INSTALLATION PROCEDURE 362
- 13.1 FEED-IN UNIT 369
- 13.2 FEED-OUT UNIT 379
- 1 July 1991 383
- SECTION 9 384
- SORTER 384
- Switches 387
- Printed Circuit Boards 387
- 6. EXIT ROLLER DRIVE 390
- 6.2 ROLLER DRIVE CIRCUIT 391
- 7. BIN DRIVE 392
- 7.2 BIN DRIVE CIRCUIT 394
- 8. MISFEED DETECTION 395
- 9. INSTALLATION PROCEDURE 396
- 9.2 INSTALLATION PROCEDURE 397
- 12. BIN GUIDE LUBRICATION 402
- SECTION 10 403
- Solenoids 406
- MACHINE CONTROL 407
- 6. DRIVE MECHANISM 409
- 7. FIRST SIDE COPY 410
- 7.3 DUPLEX STACKING 412
- 8. SECOND SIDE COPY 413
- DETECTION TIMING 414
- 10. SERVICE CALL CONDITIONS 415
- 11. DUPLEX UNIT INSTALLATION 416
- 12.1 DUPLEX TRAY REMOVAL 422
- SENSOR REPLACEMENT 424
- 12.3 TURN SENSOR REPLACEMENT 425
- 12.4 FEED MOTOR REPLACEMENT 426
- 12.9 FEED ROLLER REPLACEMENT 431
- SECTION 11 433
- SERVICE MANUAL 433
- 2. OPERATION PANEL 436
- 3. FUNCTIONAL OPERATION 438
- 5. DRIVE LAYOUT 440
- Magnetic Clutches 444
- Counters 447
- 8. OVERALL MACHINE CONTROL 449
- 9.1 AC POWER DISTRIBUTION 452
- 9.2 DC POWER DISTRIBUTION 453
- TIMING 456
- (Machine Code: A318) 458
- 12.1 SPECIFICATIONS 458
- 12.2 COMPONENT LAYOUT 459
- 12.4 POWER DISTRIBUTION 461
- Main Frame 462
- Duplex Unit 462
- 14. INSTALLATION 463
- 14.2 INSTALLATION PROCEDURE 466
- 14.4 SORTER INSTALLATION 471
- 14.5 DUPLEX UNIT INSTALLATION 471
- REPLACEMENT 472
- Copier Electrical Components 477
- Main Board 479
- Interface Board 479
- Copier Connectors 482
- CS110 (A490) 485
- PARTS CATALOG 486
- INTRODUCTION 486
- INDEX to PARTS CATALOG 486
- 1. EXTERIOR (A490) 487
- December 1, '90 487
- 2. TRANSPORT (A490) 489
- 3. SORTER MAIN BOARD (A490) 491
- 4. SORTER MAIN HARNESS (A490) 493
- 5. DECAL AND DOCUMENT (A490) 495
- PARTS INDEX 497
- DF57 (A318) 501
- 2. FEED IN SECTION (A318) 506
- 4. MAIN BOARD (A318) 512
- 5. INDICATION BOARD (A318) 515
- 6. MAIN HARNESS (A318) 517
- 7. INTERFACE HARNESS (A318) 519
- FACTORY SETTING 529
- SERIAL No 529
- P/N A0486684 529
- ± 0.1 using 530
- ± 0.2 using 530
- Data Table 532
- SP MODE OVERVIEW 534
- USER CODE 538
- AD120 (A491) 539
- 1. DUPLEX UNIT I (A491) 541
- 2. DUPLEX UNIT II (A491) 544
- 3. DUPLEX MAIN BOARD (A491) 546
- 4. DUPLEX HARNESS (A491) 548
- 5. SENSOR HARNESS (A491) 550
- 6. DECAL AND DOCUMENT (A491) 552
- POWER SUPPLY UNIT (A494) 559
- 1. POWER SUPPLY UNIT (A494) 561
- 2. INTERFACE BOARD (A494) 563
- 3. DC DRIVE BOARD (A494) 565
- TABLE OF CONTENTS 572
- INSTALLATION 575
- SERVICE TABLES 576
- TROUBLESHOOTING 580
- COPIER ELECTRICAL DATA 581
- WATER PROOF SHEETS 584
- FT4421 SERVICE MANUAL 585
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