HP LaserJet 4000 and 4050 Series Printers Service Manual

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Guidelines for Using Paper For best results, use conventional 20 lb (75 g/m 2 ) paper. Make sure the paper is of good quality and free of cuts, nicks, tears, spots, loose particles, dust, wrinkles, voids, and curled or bent edges. If you are unsure what type of paper you are loading (such as bond or recycled), check the label on the package of paper. Some paper causes print quality problems, jamming, or damage to the printer. Table 1-14. Guidelines for Using Paper Symptom Problem with Paper Solution Poor print quality or Toner adhesion. Problems with feeding. Too moist, too rough, too smooth, or embossed; faulty paper lot. Try another kind of paper, between 100-250 Sheffield, 4-6% moisture content. Dropouts, jamming, curl. Stored improperly. Store paper flat in its moisture-proof wrapping. Increased gray background shading. Too heavy. Use lighter paper. Open the Rear Output Bin. Excessive curl. Problems with feeding. Too moist, wrong grain direction or short-grain construction. Open the Rear Output Bin. Use long-grain paper. Jamming, damage to printer. Cutouts or perforations. Do not use paper with cutouts or perforations. Problems with feeding. Ragged edges. Use quality paper. 1-16 Printer Description
Note Do not use letterhead paper that is printed with low-temperature inks, such as those used in some types of thermography. Do not use raised letterhead. The printer uses heat and pressure to fuse Toner to the paper. Make sure that any colored paper or preprinted forms use inks that are compatible with the printer’s temperature (400° F or 205° C). Avoid using paper that has already been used in a printer or copier. Do not print on both sides of envelopes, transparencies, or labels. Paper Specifications 1-17
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 16 and 17: Table 1-3. Comparison of HP LaserJe
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 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
Page 88 and 89:
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
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Page Protect Page complexity (rules
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Image Formation System The image fo
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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
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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
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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
Page 182 and 183:
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
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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
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Table 7-8. General Paper Path Troub
Page 250 and 251:
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
Page 256 and 257:
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
Page 270 and 271:
Table 7-24. Light Print, Dark Print
Page 272 and 273:
Table 7-27. Skew Possible Cause Act
Page 274 and 275:
Table 7-31. Vertical Dots Possible
Page 276 and 277:
Image System Troubleshooting Half S
Page 278 and 279:
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
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Figure 7-14 Components of the Fusin
Page 292 and 293:
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
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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
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1 5 2 4 3 Figure 8-6 Internal Compo
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1 Figure 8-7 Engine Controller Boar
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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
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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
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11 13 11 13 1 2 3 10 4 5 9 12 6 8 7
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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
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Alphabetical Parts List Table 8-33.
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Table 8-33. Alphabetical Parts List
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Page 376 and 377:
Page 378 and 379:
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Table 8-34. Numerical Parts List (c
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Page 386 and 387:
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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