HP LaserJet 4000 and 4050 Series Printers Service Manual

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HP LaserJet 4000 and 4050 Series Printers Service Manual _____________
Page 1: HP LaserJet 4000 and 4050 Series Pr
Page 5 and 6: Contents 1 Printer Description Over
Page 7 and 8: 5 Functional Information Overview .
Page 9 and 10: 7 Troubleshooting Overview . . . .
Page 11 and 12: 1 Printer Description Overview This
Page 13 and 14: Table 1-1. Printer Features for the
Page 15 and 16: Table 1-2. Printer Features for the
Page 17 and 18: Table 1-4. Comparison of HP LaserJe
Page 19 and 20: Site Requirements The following env
Page 21 and 22: Environmental Requirements Table 1-
Page 23 and 24: Table 1-10. Paper Specifications, T
Page 25 and 26: Table 1-12. Paper Specifications, O
Page 27 and 28: Note Do not use letterhead paper th
Page 29 and 30: Labels CAUTION To avoid damaging th
Page 31 and 32: Envelopes with Double Side Seams So
Page 33 and 34: Card Stock and Heavy Paper Many typ
Page 35 and 36: FCC Regulations This equipment has
Page 37 and 38: Toner Safety Note Toner may stain c
Page 39 and 40: 2 Service Approach Overview This ch
Page 41 and 42: Parts and Supplies Ordering Informa
Page 43 and 44: Table 2-1. Helpful Documentation (c
Page 45 and 46: HP Support Assistant Compact Disc T
Page 47 and 48: Toner Cartridge Information The Ton
Page 49 and 50: 3 Printer Operation Overview This c
Page 51 and 52: Control Panel Keys Table 3-2. Contr
Page 53 and 54:
Control Panel Menus Press [Menu] fo
Page 55 and 56:
Private/Stored Jobs Menu This menu
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Paper Handling Menu When paper hand
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Table 3-7. Paper Handling Menu (con
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Table 3-8. Print Quality Menu (cont
Page 63 and 64:
Table 3-9. Printing Menu Printing M
Page 65 and 66:
Table 3-9. Printing Menu (continued
Page 67 and 68:
Table 3-9. Printing Menu (continued
Page 69 and 70:
Table 3-10. Configuration Menu (con
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Page 73 and 74:
Page 75 and 76:
Table 3-11. I/O Menu (continued) It
Page 77 and 78:
Table 3-12. EIO Menu EIO Menu (Netw
Page 79 and 80:
Resets Menu Use this menu with caut
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Service Menu Figure 3-2 Service Men
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Table 3-14. Changing the Page Count
Page 85 and 86:
Testing the Printer When you print
Page 87 and 88:
System Configuration MS-DOS System
Page 89 and 90:
Printer I/O Configuration Parallel
Page 91 and 92:
4 Printer Maintenance Overview This
Page 93 and 94:
Table 4-1. Cleaning the Printer Com
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Preventative Maintenance The preven
Page 97 and 98:
5 Functional Information Overview T
Page 99 and 100:
Overcurrent Overvoltage Protection
Page 101 and 102:
Toner Cartridge Detection The Toner
Page 103 and 104:
Figure 5-3 Engine Controller Board
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Page 107 and 108:
Page 109 and 110:
Motors See “Timing Diagram” on
Page 111 and 112:
Formatter System The Formatter PCA
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Input/Output Parallel Interface The
Page 115 and 116:
Random Access Memory (RAM) The RAM
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PML PML is a Printer Management Lan
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Figure 5-9 Image Formation System A
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Photosensitive Drum The special pro
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Conditioning the Drum After the Dru
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Developing the Image The developing
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Image Fusing/Variable Fusing Temper
Page 129 and 130:
Paper Feed System Figure 5-19 Paper
Page 131 and 132:
and by the six switches (SW600, 601
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Figure 5-22 Tray 1 Pickup Paper Fee
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Figure 5-24 Tray 2 Pickup Paper Fee
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Printing from the Optional 500-shee
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The CPU on the Engine Controller Bo
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is completed, the Envelope Feeder D
Page 143 and 144:
Figure 5-31 Paper Path for the Dupl
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Basic Sequence of Operation The For
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6 Removing and Replacing Parts Over
Page 149 and 150:
Tools ● ● ● ● Phillips #2 m
Page 151 and 152:
Table 6-1. Screws Used in the Print
Page 153 and 154:
Top Cover Open the Top Cover and re
Page 155 and 156:
Toner Cartridge Drive Arm Figure 6-
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Release tab if necessary Figure 6-7
Page 159 and 160:
Front Right Side Cover Latch Figure
Page 161 and 162:
Tray 1 Figure 6-11 Removing Tray 1
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Figure 6-13 Detail of the Tray 1 Se
Page 165 and 166:
Figure 6-15 Loosening the captive s
Page 167 and 168:
Output Assembly Brass arm White tab
Page 169 and 170:
Laser Scanner Shutter interlock and
Page 171 and 172:
Main Motor Figure 6-22 Removing the
Page 173 and 174:
Tray 1 Pickup Roller Figure 6-24 Re
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Tray 1 Pickup Assembly 1 Remove the
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Step 7 Step 8 Step 6 Figure 6-28 Re
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Right Side Toner Cartridge Guide Yo
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DO NOT REMOVE! Figure 6-32 Detail o
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Figure 6-34 Removing the upper scre
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Formatter Pan Figure 6-36 Removing
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Delivery Drive Assembly Figure 6-38
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Figure 6-40 Separating the Engine f
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Facing the front of the Engine Modu
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Measure this distance Figure 6-44 A
Page 195 and 196:
Separation Rollers Figure 6-46 Remo
Page 197 and 198:
Paper Feed Module Gear Train Assemb
Page 199 and 200:
Lower Paper Feed Module Plate (HP L
Page 201 and 202:
PCA Cover (HP LaserJet 4000/4000 N
Page 203 and 204:
7 Troubleshooting Overview This cha
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Table 7-1. Major Steps for Troubles
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Troubleshooting Flowchart (Continue
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Power On Note It is important to ha
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Table 7-3. No AC Power Cause Action
Page 213 and 214:
Engine Test The printer has one tes
Page 215 and 216:
Event Log Use the Event Log to diag
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Display the Event Log If the printe
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Printer Messages The following tabl
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Table 7-5. Alphabetical Printer Mes
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Page 229 and 230:
Page 231 and 232:
Table 7-6. Numerical Printer Messag
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Page 241 and 242:
Page 243 and 244:
Page 245 and 246:
The following table lists the disk
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General Paper Path Troubleshooting
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Paper Path Test To perform a Paper
Page 251 and 252:
Figure 7-5 Sample Menu Map (4000 se
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Configuration Page Use the Configur
Page 255 and 256:
Printer Information Lists the seria
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Check the Toner Cartridge Image for
Page 259 and 260:
Image Defects The quality of the pr
Page 261 and 262:
Table 7-12. Blank Page Possible Cau
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Table 7-14. Creases Possible Cause
Page 265 and 266:
Table 7-16. Contamination on Back P
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Table 7-18. Dropouts Possible Cause
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Table 7-21. Horizontal Black Lines
Page 271 and 272:
Table 7-25. Loose Toner Possible Ca
Page 273 and 274:
Table 7-29. Toner Specks Possible C
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Repetitive Defect Ruler Repetitive
Page 277 and 278:
Drum Rotation Functional Check The
Page 279 and 280:
Interface Troubleshooting This sect
Page 281 and 282:
Sample JetDirect Configuration Page
Page 283 and 284:
AUTOEXEC.BAT Standard Configuration
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Table 7-34. Communications Checks (
Page 287 and 288:
Table 7-35. Components in Figure 7-
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Figure 7-13 Components of the Duple
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Figure 7-15 Components of the Envel
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Figure 7-18 Paper Path with the Env
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Engine Controller Board Figure 7-20
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Figure 7-23 Paper Size Detection Sw
Page 299 and 300:
Connectors Figure 7-25 Connectors (
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Figure 7-27 Connectors (3 of 3) For
Page 303 and 304:
Table 7-40. Location of PCAs 1 Engi
Page 305 and 306:
Figure 7-30 Location of Sensors and
Page 307 and 308:
Solenoids and Clutch Figure 7-31 Lo
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Table 7-42. Solenoids and Clutch in
Page 311 and 312:
Table 7-43. Switches in Figure 7-33
Page 313 and 314:
8 Parts and Diagrams Overview This
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Note Parts that have no item number
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Table 8-1. Accessories and Supplies
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Table 8-3. Replaceable Cables Descr
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Table 8-4. Assemblies (Listed Alpha
Page 323 and 324:
Table 8-5. External Covers and Pane
Page 325 and 326:
Table 8-6. Top Cover Assembly Item
Page 327 and 328:
Table 8-7. Internal Components (1 o
Page 329 and 330:
Page 331 and 332:
Notes: Illustrations and Parts List
Page 333 and 334:
Page 335 and 336:
Table 8-10. Engine Controller Board
Page 337 and 338:
1 2 3 Figure 8-9 Printer Drive Asse
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Table 8-13. Tray 1 Pickup Assembly
Page 341 and 342:
1 Figure 8-12 Paper Feed Assembly T
Page 343 and 344:
1 4 2 3 Figure 8-14 Paper Feed Guid
Page 345 and 346:
Table 8-18. Delivery Assembly Item
Page 347 and 348:
1 2 3 Figure 8-17 Fuser Assembly (2
Page 349 and 350:
Table 8-21. Internal Components of
Page 351 and 352:
Table 8-22. Paper Pickup Drive Asse
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Table 8-23. 500-sheet Tray Item No.
Page 355 and 356:
Page 357 and 358:
Page 359 and 360:
2 1 Figure 8-24 Lower Paper Pickup
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Table 8-28. 250-sheet Tray Item No.
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Page 365 and 366:
Table 8-30. Optional 500-sheet Univ
Page 367 and 368:
Table 8-31. Envelope Feeder Item No
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Page 371 and 372:
Table 8-33. Alphabetical Parts List
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Page 375 and 376:
Page 377 and 378:
Page 379 and 380:
Numerical Parts List Table 8-34. Nu
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Table 8-34. Numerical Parts List (c
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Page 385 and 386:
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Index Numerics 250-sheet tray, pape
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Paper Pickup Drive Assembly 8-38 Pa
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6 5 4 3 2 1 Duplex feed motor Rever
Page 394:
Copyright© 1999 Hewlett-Packard Co
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HP LaserJet 4000 and 4050 Series Printers Service Manual

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