HP Color Laserjet Printer 3550 Bedienungsanleitung Seite 174
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Electrostatic latent image formation block
This block consists of two steps, where an electrostatic latent image is formed on the
photosensitive drums.
The drum surface carries negative electrical charges in areas that are not exposed to the
laser beam through the steps in this block. The image with negative charges on the drum is
called an electrostatic latent image, as it is invisible to the human eyes.
Figure 5-27.
Electrostatic latent image formation
Step 1: Primary charging
As a preparation to forming a latent image, a uniform negative potential is applied to the
photosensitive drum surface in this step.
The primary charging roller, interlocked to the photosensitive drum, directly charges the
drum. This roller is made of a conductive rubber. The DC bias is placed on the roller to
enable it to charge a negative potential on the drum surface.
Figure 5-28.
Primary charging
Step 2: Laser beam exposure
150 Chapter 5 Theory of operation ENWW
- 3500/3550 and 3700 1
- Service Manual 3
- Conventions 5
- Table of contents 7
- 2 Service approach 8
- 4 Printer maintenance 9
- 5 Theory of operation 9
- 6 Removal and replacement 10
- 7 Troubleshooting 12
- 8 Parts and diagrams 14
- List of tables 15
- List of figures 19
- Printer description 25
- Printer configurations 27
- Printer features 30
- ENWW Printer features 7 31
- Printer assemblies 33
- Figure 1-8 34
- Site requirements 35
- Electrical specifications 36
- Environmental specifications 37
- Printer specifications 39
- Print media specifications 40
- Warranty Statement 44
- Identification 46
- Selecting paper 48
- Printing on special media 50
- Envelopes 51
- Heavy paper 52
- HP LaserJet Tough paper 52
- Recycled paper 53
- Media weight 53
- Protecting the environment 55
- HP LaserJet printing supplies 56
- Material restrictions 56
- Extended warranty 57
- For more information 57
- Declaration of Conformities 58
- Safety statements 61
- Laser statement for Finland 62
- FCC Regulations 63
- Service approach 65
- Search approach 66
- Parts and supplies 67
- HP service agreements 69
- Other areas 69
- HP maintenance agreements 70
- Chapter contents 71
- Checking the package contents 72
- Unpacking the printer 74
- Loading paper into Tray 2 83
- Connecting power 86
- Testing the printer operation 88
- Using PowerSave Time 89
- USB configuration 90
- 1 B-connector 91
- 2 Parallel port 91
- Network configuration 92
- HP Jetdirect print servers 93
- NetWare networks 94
- AppleTalk networks 94
- UNIX/Linux networks 94
- Printer software 95
- Software for networks 96
- Utilities 97
- ENWW Printer software 75 99
- Locking the control panel 100
- Enabling memory 107
- To check DIMM installation 108
- LaserJet 3700 series printer 109
- Printer maintenance 115
- Cleaning spilled toner 116
- Cleaning mode 117
- Managing supplies 118
- Locating supplies and parts 120
- Replacing supply items 121
- Replacing the transfer unit 123
- To replace the fuser 128
- To replace the pickup roller 132
- To reset the fuser count 135
- Theory of operation 137
- Basic operation 138
- ENWW Basic operation 115 139
- Power-on sequences 140
- Figure 5-3 142
- Timing diagram 142
- Engine control system 143
- Figure 5-5 144
- DC controller circuit 144
- Block functions 145
- Table 5-2. Motor Functions 146
- Figure 5-6 147
- Motor locations 147
- Fuser control circuit 151
- Video interface control 159
- Laser/scanner system 163
- Laser control 164
- Standby L L Laser control OFF 165
- Laser emission control 166
- Image mask control 167
- Scanner motor control 168
- Speed control 169
- Phase control 169
- Failure detection 169
- Image formation system 170
- Print process 171
- Development block 175
- Transfer block 176
- Fuser block 178
- Cleaning block 179
- Developing section 180
- Cartridge cleaning control 187
- Transfer section 188
- Figure 5-44 190
- ITB cleaning control 191
- Waste toner full detection 191
- Transfer (ITB) unit detection 192
- Transfer unit life detection 193
- ITB self-aligning mechanism 194
- Color misregistration control 198
- Image stabilization control 201
- Environmental change control 202
- Image density control (D-max) 203
- Image density detection 204
- Pickup/feed system 206
- Pickup/feed unit 208
- Feed speed control 210
- Skew control mechanism 211
- Fuser/delivery unit 213
- PS8 Face-down delivery sensor 215
- M1 Feed motor 215
- M2 Delivery motor 215
- Reverse control 217
- Duplex feed mode 218
- Jam detection 219
- Paper feeder 221
- Pickup/delivery sequence 222
- Paper jam detection 223
- Removal and replacement 225
- Introduction 228
- Types of screws 229
- Supplies 231
- Front door removal 233
- Left cover removal 234
- Left front cover removal 235
- Reinstallation tip 236
- Right cover removal 237
- Top cover removal 238
- Upper rear door removal 238
- Rear cover removal 239
- Tray 1 (multipurpose) removal 240
- Main Assemblies 241
- Transfer unit removal 242
- Print cartridge removal 243
- Fuser removal 244
- Image drive assembly removal 247
- Pick-up/feed assembly removal 249
- Figure 6-29 252
- Main assembly parts 260
- Tray 1 pick-up roller removal 261
- Tray 1 separation pad removal 261
- Tray 2 pick-up roller removal 262
- Tray 2 separation pad removal 262
- Fuser sleeve unit removal 263
- Pressure roller removal 263
- Thermoswitch removal 263
- Feed guide unit removal 264
- Swing guide removal, right 266
- Swing guide removal, left 269
- Switches 274
- Power switch (SW3001) removal 275
- Figure 6-68 276
- Sensor locations 276
- Media sensor (PS5) removal 279
- Solenoids and Clutches 287
- Motor and fans 293
- Delivery motor (M2) removal 295
- Drum motor (M3) removal 295
- Developing motor (M4) removal 297
- Exhaust fan (FAN1) removal 301
- Circuit Boards 302
- Formatter PCB removal 303
- Memory controller PCB removal 310
- Control Panel PCB removal 311
- Miscellaneous parts 312
- Tray 2 (cassette) 315
- 1 Right cover 320
- 2 Left cover 320
- 3 Front cover 320
- 1 500-Sheet paper feeder PCB 324
- Troubleshooting 327
- Troubleshooting process 331
- Troubleshooting flowchart 332
- Troubleshooting power-on 334
- Printer error troubleshooting 336
- Numerical printer messages 351
- Paper path troubleshooting 380
- Paper path jam areas 381
- Paper jam error message 381
- Multiple pages are fed 384
- Table 7-9. Transfer/feed area 386
- Front door area jams (area 4) 386
- 2. Open the upper rear door 396
- 3. Remove any paper 396
- 4. Close the rear door 396
- Paper jam recovery feature 401
- Avoiding paper jams 401
- Paper path checklist 403
- Persistent jams 404
- Overhead transparency defect 405
- Calibrating the printer 407
- Using Color 408
- Press ink sets 409
- Common ink standard in the 409
- Managing color 410
- Matching colors 412
- Adjusting color balance 413
- Image defects 414
- Light image 415
- Light color 416
- Dark image 416
- Dark color 417
- Completely blank image 417
- All black or solid color 417
- Dots in vertical lines 418
- Dirt on back of paper 418
- Dirt on front of paper 418
- Vertical lines 419
- White vertical lines 419
- Horizontal line 420
- White horizontal line 420
- Color missing 421
- Blank spots 421
- Poor fusing 421
- Image distortion 422
- Color misregistration 422
- Smearing 423
- Misplaced image 423
- Reversed color 424
- Snail tracks 424
- Interface troubleshooting 427
- Parallel DOS commands 428
- @PJL [Enter] 428
- @PJL COMMENT 429
- @PJL INFO CONFIG 429
- @PJL INFO ID 429
- @PJL INFO USTATUS 429
- @PJL INFO PAGECOUNT 429
- @PJL JOB 430
- @PJL EOJ 430
- @PJL ECHO 430
- @PJL USTATUS JOB=ON/OFF 430
- @PJL USTATUSOFF 430
- Printing a menu map 431
- Information menu 431
- Paper handling menu 432
- Configure device menu 433
- Print quality menu 435
- System setup menu 438
- I/O menu 442
- Resets menu 443
- Diagnostics menu 443
- Service menu 444
- Tools for troubleshooting 446
- Information tab 447
- Settings tab 447
- HP Toolbox 448
- To view HP Toolbox 449
- HP toolbox sections 449
- Documentation tab 450
- HP toolbox links 451
- Printer configuration page 452
- Supplies status page 453
- Usage page (HP 3700 only) 454
- Event log 455
- Figure 7-11 456
- Diagnostics 457
- Engine diagnostics 458
- Diagnostics tests 459
- Printer display menu 460
- Diagnostics test menu 460
- Paper Path Test 463
- Print/Stop Test 466
- Test pages 469
- Engine resets 470
- Calibration bypass 471
- Calibrate Now 471
- Service ID 473
- Restoring the Service ID 473
- Cold reset paper 473
- Diagrams 474
- Main parts 475
- Figure 7-20 477
- Location of sensors 477
- ENWW Diagrams 453 477
- Solenoids and clutches 478
- Motors and fans 479
- Figure 7-23 480
- PCB locations 480
- Figure 7-24 481
- Figure 7-25 481
- ENWW Diagrams 457 481
- Connector locations 482
- Figure 7-27 483
- ENWW Diagrams 459 483
- Figure 7-28 484
- Figure 7-29 485
- ENWW Diagrams 461 485
- Figure 7-30 486
- General circuit diagram 487
- Figure 7-32 488
- Parts and diagrams 489
- Ordering parts 491
- ENWW Ordering parts 469 493
- ENWW Ordering parts 471 495
- Illustrations and parts lists 502
- Figure 8-2 503
- Main parts (2 of 3) 503
- Figure 8-3 504
- Figure 8-4 504
- PCB locations (1 of 2) 504
- Table 8-3. PCB locations 505
- Figure 8-5 506
- Figure 8-6 508
- External covers and panels 508
- Figure 8-7 510
- Front door assembly 510
- Figure 8-8 512
- Internal components (1 of 4) 512
- Figure 8-9 514
- Internal components (2 of 4) 514
- Figure 8-10 518
- Internal components (3 of 4) 518
- Figure 8-11 520
- Internal components (4 of 4) 520
- Figure 8-12 522
- Center frame assembly 522
- Figure 8-13 524
- Figure 8-14 528
- Main Left Side Plate Assembly 528
- Figure 8-15 530
- Figure 8-16 532
- Figure 8-17 534
- Image Drive Assembly 534
- Figure 8-18 536
- 2 RING, E XD9-0135-000CN 1 537
- Figure 8-19 538
- Table 8-16. Tray 2 (cassette) 539
- Figure 8-20 540
- Figure 8-21 542
- Figure 8-22 544
- Figure 8-23 546
- Face-down delivery assembly 546
- Figure 8-24 548
- Transfer Unit 548
- Table 8-20. Transfer unit 549
- Figure 8-25 550
- Right Swing Frame Assembly 550
- Figure 8-26 552
- Left Swing Frame Assembly 552
- Figure 8-27 554
- Table 8-23. Fuser assembly 555
- Figure 8-28 556
- Figure 8-29 558
- Figure 8-30 560
- 1 PLATE, END RB2-6469-000CN 1 561
- Alphabetical parts list 562
- Numerical parts list 575
- ENWW Numerical parts list 553 577
- ENWW Numerical parts list 555 579
- ENWW Numerical parts list 557 581
- ENWW Numerical parts list 559 583
- Q5990-90939 598
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