HP Color Laserjet Printer 3550 Bedienungsanleitung Seite 155
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Low-voltage power supply circuit
This circuit converts AC voltage from the power supply receptacle to DC power and supply
each load.
Figure 5-14.
Low-voltage power supply circuit
When the power switch (SW3001) is turned on, the AC power is supplied to the low-voltage
power supply circuit, where it is converted to +24 V, +5 V, and +3.3 V DC power required
inside the printer.
ENWW Engine control system 131
- 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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