HP LaserJet 4000 and 4050 Series Printers Service Manual

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Table 1-3. Comparison of HP LaserJet 4000 Series Printers HP LaserJet 4000 HP LaserJet 4000 T HP LaserJet 4000 N HP LaserJet 4000 TN Ethernet 10-T/ 10-2 LocalTalk optional optional standard standard Max. # Input Bins 3 4 3 4 Standard RAM 4 MB internal 4 MB internal 8 MB internal 8 MB internal 250-Sheet Tray not available 2 standard not available 2 standard 500-Sheet Tray standard not available standard not available 500-Sheet Universal Tray optional optional optional optional > 1 GB EIO Drive optional optional optional optional Envelope Feeder optional optional optional optional Duplexer optional optional optional optional 1-6 Printer Description
Table 1-4. Comparison of HP LaserJet 4050 Series Printers HP LaserJet 4050 HP LaserJet 4050 T HP LaserJet 4050 N HP LaserJet 4050 TN Ethernet 10-T/ 10-2 LocalTalk optional optional optional optional 10/100 Base TX optional optional standard standard Max. # Input Bins 3 4 3 4 Standard RAM 8 MB internal 8 MB internal 16 MB internal 16 MB internal 250-Sheet Tray not available 2 standard not available 2 standard 500-Sheet Tray standard not available standard not available 500-Sheet Universal Tray optional optional optional optional > 1 GB EIO Drive optional optional optional optional Envelope Feeder optional optional optional optional Duplexer optional optional optional optional HP Fast InfraRed Receiver (FIR) optional optional standard standard Printer Features 1-7
Page 1: HP LaserJet 4000 and 4050 Series Pr
Page 4 and 5: © Copyright Hewlett-Packard Compan
Page 6 and 7: 3 Printer Operation Overview . . .
Page 8 and 9: 6 Removing and Replacing Parts Over
Page 10 and 11: Contents-6
Page 12 and 13: Printer Features Table 1-1. Printer
Page 14 and 15: Table 1-2. Printer Features for the
Page 18 and 19: Identification Model and Serial Num
Page 20 and 21: Space Requirements 39.67 in (100.76
Page 22 and 23: Paper Specifications The following
Page 24 and 25: Table 1-11. Paper Specifications, O
Page 26 and 27: Guidelines for Using Paper For best
Page 28 and 29: Paper Weight Equivalence Table Use
Page 30 and 31: Envelopes Envelope Construction Env
Page 32 and 33: Envelope Margins The following tabl
Page 34 and 35: Safety Information Laser Safety Sta
Page 36 and 37: Laser Statement for Finland LASERTU
Page 38 and 39: Environmental Product Stewardship P
Page 40 and 41: Service Approach Repair of the prin
Page 42 and 43: Helpful Documentation Table 2-1 lis
Page 44 and 45: Phone Numbers for Ordering ● ●
Page 46 and 47: Europe, Middle East, and Africa Aus
Page 48 and 49: Warranty Statement The warranty for
Page 50 and 51: Using the Control Panel Control Pan
Page 52 and 53: Settings and Defaults The printer m
Page 54 and 55: Quick Copy Jobs Menu This menu prov
Page 56 and 57: Information Menu Table 3-6. Informa
Page 58 and 59: Table 3-7. Paper Handling Menu (con
Page 60 and 61: Print Quality Menu Table 3-8. Print
Page 62 and 63: Table 3-8. Print Quality Menu (cont
Page 64 and 65: Table 3-9. Printing Menu (continued
Page 66 and 67:
Table 3-9. Printing Menu (continued
Page 68 and 69:
Configuration Menu Items in this me
Page 70 and 71:
Table 3-10. Configuration Menu (con
Page 72 and 73:
Table 3-10. Configuration Menu (con
Page 74 and 75:
Table 3-11. I/O Menu I/O Menu Items
Page 76 and 77:
Table 3-11. I/O Menu (continued) It
Page 78 and 79:
Table 3-12. EIO Menu (continued) It
Page 80 and 81:
Service Mode Service Mode should be
Page 82 and 83:
Page Count The page count stored in
Page 84 and 85:
MAINTENANCE COUNT in the Service Mo
Page 86 and 87:
Resetting the Printer Cold Reset Co
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Serial MS-DOS Commands Most IBM com
Page 90 and 91:
Pacing (Handshaking) Pacing (or “
Page 92 and 93:
Cleaning the Printer and Accessorie
Page 94 and 95:
Using the Printer Cleaning Page If
Page 96 and 97:
Expected Life of Components The fol
Page 98 and 99:
Power Supply System AC/DC Power Dis
Page 100 and 101:
High-voltage Power Distribution Fig
Page 102 and 103:
Engine Controller System The follow
Page 104 and 105:
Engine Controller Board Inputs and
Page 106 and 107:
Figure 5-6 Engine Controller Board
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Laser and Scanner Drive Based on in
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The Scanner Motor is controlled and
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Note Printer error messages overrid
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Disk The disk accessory is mounted
Page 116 and 117:
Page Protect Page complexity (rules
Page 118 and 119:
Image Formation System The image fo
Page 120 and 121:
Toner Cartridge Figure 5-10 Toner C
Page 122 and 123:
Cleaning the Drum The cleaning blad
Page 124 and 125:
Writing the Image During the writin
Page 126 and 127:
Transferring the Image During the t
Page 128 and 129:
Variable Fusing Temperature Figure
Page 130 and 131:
Figure 5-20 Paper Path The presence
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Printing from Tray 1 The presence o
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Printing from Tray 2 When the Forma
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Multi-Feed Prevention Mechanism Whe
Page 138 and 139:
Pickup and Feeding The Paper Feeder
Page 140 and 141:
Envelope Feeder The operation seque
Page 142 and 143:
Duplexer The operation sequences of
Page 144 and 145:
Figure 5-32 Paper Feed for the Dupl
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Figure 5-33 Timing Diagram 5-50 Fun
Page 148 and 149:
Removal and Replacement Strategy Th
Page 150 and 151:
Table 6-1. Screws Used in the Print
Page 152 and 153:
Removing Covers It is usually best
Page 154 and 155:
Control Panel Tab Figure 6-4 Removi
Page 156 and 157:
Toner cartridge drive arm Rear scre
Page 158 and 159:
Left Side Cover Latch (inside) Catc
Page 160 and 161:
Rear Cover/Rear Output Bin Step 2 S
Page 162 and 163:
Figure 6-12 Removing the Tray 1 Sen
Page 164 and 165:
Removing Assemblies The order in wh
Page 166 and 167:
Formatter Cage Assembly For accessi
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2 Facing the rear of the printer, r
Page 170 and 171:
Fan Figure 6-21 Removing the Fan 1
Page 172 and 173:
Transfer Roller DO NOT TOUCH! (See
Page 174 and 175:
Figure 6-25 Detail of the Tray 1 Pi
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Figure 6-27 Removing the Tray 1 Pic
Page 178 and 179:
Toner cartridge guide Figure 6-29 R
Page 180 and 181:
Registration Assembly Figure 6-31 R
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Paper Feed Assembly 1 Remove the fo
Page 184 and 185:
Hint For replacement of the Paper F
Page 186 and 187:
Gear Train Toner Cartridge Drive Ar
Page 188 and 189:
Separating the Engine Module from t
Page 190 and 191:
Engine Controller Board Note After
Page 192 and 193:
Adjusting the Top Margin When you r
Page 194 and 195:
Paper Feed Rollers The following pr
Page 196 and 197:
Paper Feed Module Plate Remove the
Page 198 and 199:
Paper Feed Module Side Rails Remove
Page 200 and 201:
PCA Cover (HP LaserJet 4000 T/4000
Page 202 and 203:
PCA Controller This procedure is th
Page 204 and 205:
Troubleshooting Process The trouble
Page 206 and 207:
Troubleshooting Flowchart Figure 7-
Page 208 and 209:
Troubleshooting the Printing System
Page 210 and 211:
Table 7-2. Power On Defect or Blank
Page 212 and 213:
Table 7-4. No DC Power Cause Action
Page 214 and 215:
Figure 7-2 Location of the Engine T
Page 216 and 217:
Most recent error (up to 30) Figure
Page 218 and 219:
Interpret the Event Log The Event L
Page 220 and 221:
Table 7-5. Alphabetical Printer Mes
Page 222 and 223:
Page 224 and 225:
Page 226 and 227:
Page 228 and 229:
Page 230 and 231:
Page 232 and 233:
Table 7-6. Numerical Printer Messag
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Page 238 and 239:
Page 240 and 241:
Page 242 and 243:
Page 244 and 245:
Page 246 and 247:
Disk Error Number Error Description
Page 248 and 249:
Table 7-8. General Paper Path Troub
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Information Pages From the printer
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Figure 7-6 Sample Menu Map (4050 se
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Printer Information Lists the seria
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Verify Installed Options Under “I
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Note Toner Cartridges are rated for
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Hint If you find a defect that is n
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Table 7-13. Blank Spots Possible Ca
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Table 7-15. Curl Possible Cause Act
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Table 7-17. Distorted Image Possibl
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Table 7-20. Gray Background Possibl
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Table 7-24. Light Print, Dark Print
Page 272 and 273:
Table 7-27. Skew Possible Cause Act
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Table 7-31. Vertical Dots Possible
Page 276 and 277:
Image System Troubleshooting Half S
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High-voltage Power Supply Functiona
Page 280 and 281:
Network statistics I/O card status
Page 282 and 283:
HP JetDirect Configuration ● ●
Page 284 and 285:
Communications Checks Table 7-34. C
Page 286 and 287:
Reference Diagrams Locations of Com
Page 288 and 289:
Figure 7-12 Components of the Paper
Page 290 and 291:
Figure 7-14 Components of the Fusin
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Paper Path Figure 7-16 Paper Path (
Page 294 and 295:
Figure 7-19 Paper Sensors and the P
Page 296 and 297:
Paper Size Detection Switches Figur
Page 298 and 299:
Motors Figure 7-24 Location of Moto
Page 300 and 301:
Figure 7-26 Connectors (2 of 3) 7-9
Page 302 and 303:
PCAs Figure 7-28 Location of PCAs 7
Page 304 and 305:
Sensors and Thermistor Figure 7-29
Page 306 and 307:
Table 7-41. Sensors and Thermistor
Page 308 and 309:
Figure 7-32 Location of Solenoids a
Page 310 and 311:
Switches Figure 7-33 Location of Sw
Page 312 and 313:
Timing Figure 7-34 Pickup Timing fo
Page 314 and 315:
How To Use the Parts Lists and Diag
Page 316 and 317:
Accessories and Supplies The follow
Page 318 and 319:
Common Screws and Replacement Cable
Page 320 and 321:
Illustrations and Parts Lists Top C
Page 322 and 323:
1 2 9 8 3 4 6 7 5 Figure 8-2 Extern
Page 324 and 325:
5 4 1 3 2 Figure 8-3 Top Cover Asse
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16 18 1 2 4 3 19 5 6 9 7 8 10 15 14
Page 328 and 329:
23 21 20 1 19 18 17 2 15 16 3 4 5 6
Page 330 and 331:
Table 8-8. Internal Components (2 o
Page 332 and 333:
1 5 2 4 3 Figure 8-6 Internal Compo
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1 Figure 8-7 Engine Controller Boar
Page 336 and 337:
2 1 Figure 8-8 Delivery Drive Assem
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1 7 2 6 5 4 3 Figure 8-10 Tray 1 Pi
Page 340 and 341:
1 Figure 8-11 Tray 1 Assembly Table
Page 342 and 343:
1 Figure 8-13 Registration Assembly
Page 344 and 345:
1 2 3 4 Figure 8-15 Delivery Assemb
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1 2 Figure 8-16 Fuser Assembly (1 o
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13 1 2 3 4 12 5 7 6 14 11 10 8 9 Fi
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1 8 2 6 3 7 5 4 Figure 8-19 Paper P
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7 11 12 1 3 5 4 2 6 9 8 10 Figure 8
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1 12 11 13 4 3 2 5 10 3 6 9 6 8 7 F
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7 6 5A 4 5B 1 3 8 2 Figure 8-22 Int
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1 2 Figure 8-23 Upper Paper Pickup
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6 5 1 3 4 2 Figure 8-25 250-sheet T
Page 362 and 363:
11 13 11 13 1 2 3 10 4 5 9 12 6 8 7
Page 364 and 365:
2 3 4 7 8 1 5 6 Figure 8-27 Optiona
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4 3 2 1 Figure 8-28 Envelope Feeder
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1 6 2 3 5 4 Figure 8-29 Internal Co
Page 370 and 371:
Alphabetical Parts List Table 8-33.
Page 372 and 373:
Table 8-33. Alphabetical Parts List
Page 374 and 375:
Page 376 and 377:
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Table 8-34. Numerical Parts List (c
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Page 388 and 389:
Engine Controller Board Assembly 8-
Page 390 and 391:
T testing, engine 7-11 thermistor 7
Page 392:
6 5 4 3 2 1 Duplex feed motor Rever
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HP LaserJet 4000 and 4050 Series Printers Service Manual

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