HP 9040 Service Manual Page 99
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Laser/scanner system 83
Laser/scanner system
The laser/scanner unit of the HP LaserJet 9000 series printer and the HP LaserJet 9040/9050 series
printer contains two laser diodes in its laser unit. The printer employs the “twin-beam method,” which
scans two lines simultaneously.
Based on signals it receives from the DC controller and the formatter, the laser/scanner PCA causes
the two laser diodes to emit laser beams. The beams strike a six-sided mirror that rotates at a
constant speed. The beams reflect off the mirror, pass through a focusing lens and a reflective mirror,
and focus on the photosensitive drum.
The scanning mirror rotating at a constant speed allows the laser beams to scan across the drum at
a constant speed. Finally, a latent image is formed on the drum surface by constant-speed rotation of
the photosensitive drum and constant-speed scanning of the laser beams.
Figure 28. Laser/scanner system
- HP LaserJet 9000/9040/9050 1
- Service_____________________ 3
- NERGY STAR 4
- Table of contents 5
- 4 Product maintenance 6
- 5 Theory of operation 6
- List of tables 11
- List of figures 13
- 1 Product information 17
- HP LaserJet 9040/9050 printer 20
- Product specifications 22
- Product overview 26
- Interface connections 27
- Optional accessories 28
- Regulatory information 29
- Service approach 30
- 2 Product requirements 31
- Site requirements 32
- Space requirements 33
- 2,591 mm (102 inches) 34
- Media specifications 35
- Label specifications 36
- Transparency specifications 37
- Storing print media 38
- Envelope storage 39
- Media input/output options 41
- 3 Product configuration 45
- Using the control panel 46
- Control-panel buttons 47
- Numeric keypad commands 48
- Settings and defaults 49
- Settings and defaults 35 51
- Printer driver information 52
- Control-panel menus 53
- Retrieve job menu 54
- Information menu 54
- Paper-handling menu 55
- Item Values Explanation 56
- Configure device menu 57
- PCL submenu 58
- Configure device menu 43 59
- Print-quality submenu 60
- Configure device menu 45 61
- System setup submenu 62
- Configure device menu 47 63
- I/O submenu 64
- EIO X Jetdirect submenu 65
- Configure device menu 51 67
- Resets submenu 69
- Diagnostics menu 70
- Service menu 70
- Windows systems 71
- NTER for each 72
- NTER to exit the FTP session 72
- Continue 74
- Preventative maintenance 76
- General cleaning 77
- Internal cleaning 78
- Fuser cleaning 81
- Process a cleaning page 82
- Print cartridge information 83
- Refilled print cartridges 84
- Print-cartridge weights 84
- Basic operation 86
- State Period Operation 88
- Power-on sequence 89
- Timing chart 90
- Engine control system 91
- DC controller PCA 92
- DC controller operations 93
- Low-voltage power supply unit 96
- Formatter system 97
- Laser/scanner system 99
- Image formation system 100
- Print cartridge 101
- Cartridge memory 102
- Toner seal 102
- Toner-level detection 102
- Pickup and feed system 103
- Jam detection 104
- Pickup and feed system 89 105
- Sensor/switch Description 106
- Pickup and feed system 91 107
- Motor/solenoid Description 108
- Tray 1 driver PCA 109
- Power supply 109
- Sequence of operation 109
- Pickup and feed 110
- Tray 4 driver PCA 111
- 6 Removal and replacement 113
- Introduction 115
- Right top cover 117
- To reinstall 118
- Left top cover 119
- Front cover 120
- Right door 121
- Right lower cover 122
- Left door and diverter 123
- Left back cover 124
- Back cover 125
- Right and left rail covers 126
- Top assemblies 127
- Laser/scanner assembly 128
- Delivery assembly 129
- Delivery-fan assembly 130
- Delivery motor 132
- Cartridge release lever 133
- Front assemblies 135
- Transfer-roller assembly 136
- Front assemblies 121 137
- Figure 61. Tray 2 or tray 3 137
- Fuser-jam-removal knob 139
- Registration-jam-removal knob 140
- Right assemblies 141
- Paper-input unit (PIU) 142
- Registration assembly 145
- Transfer-guide assembly 147
- Left assemblies 149
- Fuser assembly 150
- Back assemblies 151
- Low-voltage power supply 152
- High-voltage power supply 153
- DC controller 154
- Toner-sensor contact assembly 156
- Drum motor 157
- Feed-drive assembly 158
- Power-supply fan (fan 1) 159
- Cartridge fan (fan 5) 160
- Controller fan (fan 2) 161
- Jetlink connector 162
- Fuser delivery-drive assembly 165
- Orientation 167
- Left side cover 167
- Right side cover 168
- Back covers 169
- Drive motor 173
- Drive assembly 174
- Controller board 175
- Pickup assembly 178
- Paper-connecting unit 179
- 7 Troubleshooting 181
- Troubleshooting process 183
- Troubleshooting process 169 185
- Envelopes are wrinkling 188
- Fusing is poor 188
- Power-on 190
- Event log page 191
- Sample event log 192
- View the event log 193
- Control-panel messages 194
- Printer-message tables 195
- Alphabetical error messages 196
- AUSE/RESUME to return the 200
- Numerical error messages 204
- position 225
- Paper-path test 229
- Service test 229
- Code Description FRU 230
- Service-level diagnostics 231
- Diagnostics flowchart 232
- Cold reset 233
- AUSE/RESUME (START on MFPs) 234
- ENU (START on MFPs) 236
- Tray 4 diagnostics 237
- Standalone running test 238
- Sensor test 238
- Light-pattern interpretation 239
- Jam troubleshooting 240
- Customer print job 241
- Clearing jams 241
- Configuration page 242
- Verify installed options 244
- Jetdirect page 245
- Supplies status page 246
- Usage page 247
- File directory page 248
- Check the print cartridge 250
- EconoMode 250
- Image-defect tables 251
- Table 29. Image defects 252
- Problem Cause Solution 252
- SMALL PAPER 257
- SPEED=SLOW 257
- PAPER SPEED 258
- Repeating defect ruler 259
- Media troubleshooting 260
- Isolate a media brand 261
- Isolate a media type 261
- Communication troubleshooting 262
- HP LaserJet 9040mfp only) 263
- Ping-test results 264
- Connectivity problems 266
- Save + Restore 266
- Wiring diagrams 267
- Wiring diagrams 253 269
- 8 Parts and diagrams 271
- Common hardware 277
- Illustrations and parts lists 278
- Right cover assembly 281
- Internal 282
- Internal 267 283
- Internal 269 285
- (if different) 285
- Internal 271 287
- Internal 273 289
- Drum feed drive assembly 290
- Fuser delivery drive assembly 291
- Cartridge lifter assembly 292
- RG5-5635-080CN 1 293
- Paper input unit 294
- Transfer roller assembly 296
- Table 47. Delivery assembly 298
- PCA assembly location 299
- Tray 4 main body 300
- Tray 4 285 301
- Tray 4 287 303
- Tray 4 drive assembly 304
- Tray 4 PCA location 305
- Alphabetical parts list 307
- Alphabetical parts list 293 309
- Alphabetical parts list 295 311
- Numerical parts list 312
- Numerical parts list 297 313
- Numerical parts list 299 315
- Index302 Index 318
- Index Index303 319
- Index304 Index 320
- Index Index305 321
- Index306 Index 322
- Index Index307 323
- Index308 Index 324
- Index Index309 325
- Index310 Index 326
- Index Index311 327
- Index312 Index 328
- Index Index313 329
- Index314 Index 330
- *Q3721-90963* 332
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