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Q2431-90912 Chapter 6 Removing and replacing parts 195
Paper feed assembly
1. Remove the following assemblies:
● Tray 1. See “Tray 1 ” on page 152.
● Tray 1 pickup assembly. See “Tray 1 paper-pickup assembly” on page 192.
2. Unplug the paper-feed assembly wire-harness connector from the DC controller PCA
(location J89; callout 1). Unweave the wire-harness from the wire guide (callout 2).
Hint It might be necessary to remove additional wire-harnesses from the wire guides to gain access
to the paper-feed assembly wire-harness.
Figure 151. Paper feed assembly (1 of 2)
2
11
2
- 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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