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86 Theory of operation Q2431-90912
Fixing/delivery block
The paper pickup and feed system is divided into two blocks. The paper pickup tray to the fuser
block, and the fuser to output bin block.
Figure 21. Paper pickup/feed and fuser/delivery block diagram
The fuser/delivery block consists of the various rollers, sensors, the fuser, and the output
delivery assembly. The rollers transport the media through the fuser/delivery block paper path.
The fuser applies heat and pressure to the media to permanently bond the toner image (which
was transferred to the media from the photosensitive drum in the print cartridge) to the media.
The output delivery assembly sends the printed media either to the rear output bin (if the rear
output door is open) or to the top output bin (the default output delivery bin). Sensors along the
paper path detect the movement of the media, jams if they occur, and when the top output bin is
full.
Fuser/delivery block
Paper pickup/feed block
- LaserJet 4200 1
- LaserJet 4300 1
- Table of contents 5
- 4 Printer maintenance 6
- 5 Theory of operation 6
- 7 Troubleshooting 8
- List of figures 11
- List of tables 17
- 1 Printer description 21
- Printer configurations 23
- Model and serial numbers 24
- Site requirements 25
- Physical dimensions 26
- Environmental specifications 27
- Paper specifications 29
- Size Dimensions Weight 32
- Supported types of media 34
- Overhead transparencies 36
- Envelopes 37
- Card stock and heavy paper 38
- Types of print media to avoid 39
- Safety information 40
- EMI statement (Korea) 41
- VCCI statement (Japan) 41
- Laser statement (Finland) 42
- Regulatory information 43
- Material restrictions 45
- Material Safety Data Sheet 45
- For more information 45
- U.S. returns 45
- Non-U.S. returns 45
- Declarations of Conformity 46
- 2 Service approach 47
- Service approach 48
- Parts and supplies 48
- Print-cartridge information 51
- 3 Printer operation 55
- Using the control panel 56
- Control-panel buttons 57
- Using the printer Help system 57
- Settings and defaults 58
- Retrieve Job menu 61
- Information menu 61
- Paper Handling menu 62
- Item Values Explanation 63
- Configure Device menu 64
- Print Quality submenu 66
- System Setup submenu 69
- ELECT () button 70
- Stapler/stacker submenu 71
- I/O submenu 72
- Cleaning the fuser 75
- Cleaning spilled toner 77
- ● 110-V printer kit 78
- ● 220-V printer kit 78
- Maintaining the stapler unit 80
- Loading staples 82
- Control system overview 88
- Laser/scanner system overview 88
- General descriptions 89
- Motor and fan control 90
- High-voltage circuit 93
- Low-voltage circuit 94
- Toner detection 95
- Cartridge detection 95
- Cartridge memory 95
- Laser/scanner control 97
- Paper pickup system 98
- Paper pickup and feed block 99
- Printing from tray 1 100
- Figure 17. Tray 1 pickup 101
- Printing from tray 2 102
- Lifter-driver operation 104
- Multiple feed prevention 104
- Media skew prevention 105
- Fixing/delivery block 106
- Printer jam detection 107
- Printer delivery delay jam 108
- Printer door open jam 109
- Printer residual media jam 109
- Envelope feeder 115
- Envelope feeder jam detection 117
- Duplexer 118
- Reversing and duplexer pickup 119
- Duplexer jam detection 120
- Stacker and stapler/stacker 121
- Stacker feed and delivery 124
- Stacker jam detection 125
- Stapler/stacker 126
- Staple mode feed and delivery 129
- Stapler unit 133
- Stapler unit operation 134
- Side view 135
- Front view 135
- Staple level detection 136
- Stack mode feed and delivery 136
- Stapler/stacker jam detection 137
- Image-formation system 138
- Primary charging 140
- Writing the image 141
- Developing the image 142
- Transferring the image 143
- Fusing the image 144
- Print cartridge memory chip 146
- Formatter system 147
- EconoMode 148
- Input/output 148
- Printer memory 149
- PJL overview 150
- Control panel 150
- Removing and replacing parts 151
- Required tools 153
- Before performing service 153
- After completing service 153
- Screws used in the printer 154
- Parts-removal tree 155
- User-replaceable parts 157
- Transfer roller 158
- Tray 1 pickup roller 159
- Tray 1 separation pad 160
- Tray 2 feed rollers 161
- Formatter cover 165
- Top cover 166
- Right-side cover 169
- Left-side cover 171
- Rear output bin 175
- Control-panel display 176
- Control-panel assembly 177
- Internal components 180
- Formatter assembly 181
- Output delivery assembly 183
- Duplexing pendulum assembly 185
- Tray 2 media-size sensor 187
- Main cooling fan (left side) 188
- Laser/scanner assembly 193
- Main motor 197
- Tray 2 lifter-drive assembly 199
- DC controller PCA 201
- Paper-pickup assembly 203
- Main drive assembly 206
- Power supply 208
- Paper-feed belt assembly 211
- Tray 1 paper-pickup assembly 212
- Paper feed assembly 215
- Registration assembly 218
- Transfer assembly 220
- Accessories 224
- 500-sheet feeder control PCA 227
- 1,500-sheet feeder assembly 234
- feed rollers 234
- 1,500-sheet feeder door 235
- rear cover 237
- Troubleshooting 247
- Introduction 250
- Troubleshooting process 251
- Miscellaneous 253
- Troubleshooting flowchart 254
- Power-on checks 256
- Problem Action 257
- Troubleshooting tools 259
- Menu map 260
- Configuration page 261
- Supplies status page 262
- Embedded Web server 263
- Information tab 264
- Settings tab 264
- Networking tab 264
- Other links 265
- To select status messages 266
- Control-panel menus 267
- Diagnostics menu 268
- Service ID 270
- Restoring the Service ID 270
- Cold reset 271
- NVRAM initialization 271
- Hard-disk initialization 272
- Power-on bypass 272
- Self test 273
- Test pages 274
- Interface troubleshooting 275
- Jetdirect page 276
- Status messages 277
- Warning messages 277
- Error messages 277
- Critical-error messages 277
- Message Description Action 278
- ) button for 278
- ) button 281
- Numerical printer messages 294
- ELECT ( ) button 301
- 57.3 Cartridge fan error (F2) 307
- 57.4 Main fan error (F1) 307
- TRAY 4 LIFTER MOTOR FAILURE 311
- Paper-path troubleshooting 315
- Paper-jam recovery 316
- Avoiding paper jams 317
- Persistent jams 318
- Paper-path test 320
- To perform a paper- test 320
- Jams in tray 1 321
- Jams in tray 2 321
- Jams in tray 3 and/or tray 4 322
- Jams in the paper path 323
- Jams in the duplex path 323
- Media transport problems 324
- Paper is skewed 325
- Image defects 328
- TONER LOW 329
- INFORMATION MENU 330
- Image defect tables 331
- Table 57. Specks or dots 334
- Table 59. Lines 336
- Table 63. Distorted images 338
- Table 72. Black page 342
- Table 74. Dark print 344
- Overview 346
- Initial checks 346
- Jam errors 347
- Paper transport errors 350
- Malfunction errors 350
- Component errors 351
- Printer component locations 352
- Printer switches and sensors 356
- Printer motors and fans 357
- Printer PCAs 358
- Accessory component locations 359
- 1,500-sheet feeder main parts 361
- DC controller block diagram 376
- General timing diagrams 377
- 8 Parts and diagrams 381
- Ordering information 382
- HP service agreements 383
- HP PartnerCare 383
- Accessories and supplies 384
- ● English, French, Italian 387
- ● English, Danish, Finnish 387
- ● English, Japanese, Korean 387
- 110-127v 397
- 220-240v 397
- Figure 252. Transfer assembly 407
- Table 102. Transfer assembly 407
- Table 103. Fuser 409
- Alphabetical parts list 425
- Numerical parts list 429
- Q2431-90912 Index 413 433
- Numerics 433
- 414 Index Q2431-90912 434
- 415 Index Q2431-90912 435
- 416 Index Q2431-90912 436
- 417 Index Q2431-90912 437
- 418 Index Q2431-90912 438
- 419 Index Q2431-90912 439
- 420 Index Q2431-90912 440
- Q2431-90912 Index 421 441
- 422 Index Q2431-90912 442
- Q2431-90912 Index 423 443
- 424 Index Q2431-90912 444
- Q2431-90912 Index 425 445
- 426 Index Q2431-90912 446
- Q2431-90912 Index 427 447
- 428 Index Q2431-90912 448
- Q2431-90912 Index 429 449
- 430 Index Q2431-90912 450
- Hewlett-Packard Company 452
- Q2431-90912 452
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