HP HP LaserJet Printer 8000 Service Manual Page 433
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- Table of contents
- TROUBLESHOOTING
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EN
Image Quality
409
Image System Troubleshooting
Half Self Test Functional Check
The electrophotographic process can be subdivided into the following
stages:
●
Cleaning (removing excess toner from drum surface)
●
Conditioning (placing a uniform electrical charge on drum)
●
Writing (laser strikes surface of drum to create latent image)
●
Development (formation of the toner image on drum)
●
Transfer (charge to transfer the image to paper)
●
Fusing (heat and pressure to produce a permanent image)
See Chapter 5 for more information.
The purpose of the Half Self Test Check is to determine which
process is malfunctioning. Perform the test as follows:
1
Print a Configuration Page. See “Configuration Page” on
page 342 for instructions.
2
Open the top cover after the paper advances half-way through the
printer (about five seconds after the Main Motor begins rotating).
The leading edge of the paper should have advanced past the
toner cartridge.
3
Remove the toner cartridge.
4
Open the toner cartridge's drum shield to view the drum's
surface.
If a
dark and distinct toner image is present
on the drum's
surface, assume that the first four functions of the
electrophotographic process are functioning (cleaning,
conditioning, writing, and developing—see Chapter 5), and
troubleshoot the failure as a transfer or fusing problem.
If
NO image is present
on the photosensitive drum, perform the
functional checks on the following pages:
- Service Manual 1
- Conventions 5
- Chapter Descriptions 6
- Subject Index 7
- Table of Contents 9
- 2 Site Requirements 10
- 3 Operating Overview 10
- 4 Maintenance and Adjustments 11
- 5 Functional Overview 11
- 6 Removal and Replacement 12
- 7 Troubleshooting 14
- 8 Parts and Diagrams 15
- List of Figures 17
- List of Tables 23
- Product Information 25
- Printer Features 26
- Paper Capacities and Sizes 28
- Identification 30
- Specifications 31
- Media Selection Guidelines 35
- Adhesive Labels 36
- Transparencies 37
- Storing Print Media 37
- Shipping Print Media 37
- Product Overview 38
- Formatter Assemblies 42
- Accessories and Options 43
- Ordering Information 44
- Hard Disk 50
- 11 x 17 in, A3 16 MB 16 MB 51
- Legal 16 MB 16 MB 51
- Service Approach 52
- Exchange Program 53
- Consumables 53
- Toner Cartridge Life 53
- Cartridges 54
- Recycling Toner Cartridges 54
- Technical Assistance 55
- HP CompuServe Forum 56
- Internet 56
- World Wide Web 56
- Other Areas 56
- Warranty 57
- Warranty Limitations 58
- Regulatory Information 59
- FCC Regulations 59
- Protecting the Environment 60
- Material Safety Data Sheet 62
- Environmental Conformity 63
- Declaration of Conformity 64
- Safety Statements 66
- Korean EMI statement 67
- Laser Statement for Finland 67
- Site Requirements 69
- Operating Environment 70
- Space Requirements 71
- Environmental Requirements 73
- Operating Overview 75
- Using the Control Panel 76
- Indicator Lights 77
- Settings and Defaults 78
- Printer Driver Information 78
- Paper Source Default 78
- Resetting the Printer 79
- Control Panel Menus 82
- Information Menu 83
- Paper Handling Menu 84
- Print Quality Menu 86
- Printing Menu 88
- Configuration Menu 91
- I/O Menu 94
- EIO Menu 96
- Resets Menu 98
- Service Mode 99
- Testing the Printer 104
- Figure 3-2 Configuration Page 105
- Table 3-13. Key to Figure 3-2 106
- Figure 3-3 Menu Map Page 107
- Table 3-14. Key to Figure 3-3 108
- Cold Reset 109
- Maintenance and 111
- Adjustments 111
- Cleaning the Printer 113
- Cleaning Spilled Toner 114
- Preventative Maintenance 115
- Tray Adjustment Procedure 116
- Procedure 118
- Functional 121
- Overview 121
- Power Distribution System 123
- AC Power Distribution 124
- Toner Cartridge Detection 125
- Print Density Adjustment 125
- Formatter System 126
- Resolution Enhancement (REt) 127
- EconoMode 128
- DC Controller System 129
- Engine Test Microswitch 130
- Image Formation System 131
- Toner Cartridge 132
- The Photosensitive Drum 133
- Drum Cleaning 134
- Drum Conditioning 135
- Image Writing 136
- Image Developing 137
- Image Fusing 140
- Paper Paths and Components 141
- Multibin Mailbox Components 145
- Pickup and Feed System 147
- Power Supply 147
- Control Device Title Location 149
- Operating Modes 150
- Bidirectional Environment 151
- Non-bidirectional Environment 151
- Receiving Paper 151
- Delivering Paper 151
- Communication Link 152
- Figure 5-19 C-link Connection 153
- Stapler Components 155
- Paper Feed Cycle 158
- Stapling Cycle 158
- Eject Cycle 158
- PAPER FEED CYCLE 159
- STAPLING CYCLE 159
- EJECT CYCLE STACKING 159
- Printer Input Sources 160
- Printing from Tray 1 161
- Two-Sided Printing 161
- Paper Jam Detection 162
- Printer Timing 162
- Removal and 167
- Replacement 167
- Required Tools 170
- User Installable Accessories 171
- Disk Drive 172
- Duplexer 173
- Envelope Feeder 174
- 2000-sheet or 2 x 500 175
- To Reinstall: 176
- Multibin Mailbox/5-bin 177
- Mailbox with Stapler 177
- 7-bin Tabletop Mailbox 178
- Hardware Table 181
- Table 6-1. Hardware Table 182
- Control Panel 183
- AC Access Cover 184
- Back Cover 186
- Front Cover 187
- Left Lower Cover 189
- Top Cover 190
- Diverter Assembly 196
- Door Assembly, Diverter 197
- Door Assembly, Right Lower 198
- (figure 6-17, callout 3) 200
- Fan Housing 201
- Fan Motor 202
- Fan 2, Exhaust (LVPS) 203
- Fan Housing (See Fan 2) 205
- Feeder Assembly 207
- Formatter Assembly 209
- Fusing Assembly 211
- Laser/Scanner Assembly 213
- Main Gear Assembly 215
- Main Motor Assembly 218
- Paper Input Unit (PIU) 219
- Paper Input Unit 220
- PCA, DC Controller 221
- PCA, Output Paper Sensor 222
- PCA, Paper Size 226
- Registration Assembly 231
- Feed Roller 234
- Separation Pad 235
- Sensor, Registration (PS1) 240
- Transfer Roller Assembly 243
- Tray 1 Assembly 245
- Tray 2 and 3 Assemblies 246
- Mailbox With Stapler 247
- Delivery Head Assembly 248
- Flipper Assembly 251
- Input Paper Guide 254
- Interlock Switch 255
- Jam Access Door Assembly 256
- Motor, Delivery Head Position 264
- Paper Bins and Blind Cover 268
- PCA, Controller 269
- Strings, Anti-Curl 270
- Stapler Assembly 273
- Back Plate 274
- Stapler Controller PCA 276
- Top Cover Assembly 279
- Stapler Bed Assembly 280
- Remove 2 screws 287
- (Paper Path Cover) 295
- Sensor PCA 304
- Assembly (Flipper) 310
- Mechanism 314
- 7-bin Tabletop Mailbox Handle 316
- Figure 6-124 Cover Latch 318
- 1 Remove the handle 318
- 2 x 500-sheet Input Tray 319
- Figure 6-126 Back Cover 320
- 1 Remove 4 screws 320
- To reinstall: 324
- 5 Unplug the connector 334
- Assembly 335
- Separation Rollers 337
- Sensing PCA 339
- Adjustable Foot Tip 348
- Troubleshooting 351
- Troubleshooting Process 352
- Power On 356
- Problem Action 357
- Table 7-3. Fans 358
- Fan Name Fan Location 358
- Engine Test 359
- Event Log 360
- Display 361
- Figure 7-5 Sample Event Log 361
- Most recent error 361
- Print the Event Log 362
- Display the Event Log 362
- Interpret the Event Log 363
- Information Pages 364
- Figure 7-6 Sample Menu Map 365
- Configuration Page 366
- Verify Installed Options 368
- Communication 370
- EIO Troubleshooting 372
- Verify Host System Operation 374
- Printer Messages 375
- Event Log Table 376
- HP LaserJet 8000, 8000 N 385
- 8000 DN, and HP Mopier 385
- 240 Printers Service Manual 385
- Supplement for 385
- Paper-handling Accessories 385
- HP LaserJet Family 418
- Paper Specification Guide 418
- Check the Toner Cartridge 419
- Specifications Guide 420
- HP LaserJet 421
- HP LaserJet Printer 427
- Table 7-19. Image Skew 428
- Repetitive Defect Ruler 432
- Image System Troubleshooting 433
- Image Quality 435
- Troubleshooting Checks 436
- HP LaserJet Printer Family 438
- Paper Specifications Guide 438
- Paper Path Test 439
- Customer Print Job 440
- Clearing Paper Jams 441
- Clearing Repeated Paper Jams 441
- Diagnostics on Accessories 442
- Diagnostics 446
- Accessories 450
- Paper Curl 455
- Diagrams 456
- Parts and Diagrams 465
- Ordering Parts 466
- Accessories and Supplies 467
- Illustrations and Parts Lists 468
- Paper-Handling Components 469
- Fig Ref Description Part QTY 477
- 34 Latch XZ9-0379-000CN 1 487
- Alphabetical Parts List 491
- Numerical Parts List 499
- Index 507
- Numerics 507
- 484 Index 508
- 486 Index 510
- 488 Index 512
- 490 Index 514
- 492 Index 516
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