HP LaserJet 4000 and 4050 Series Printers Service Manual

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Warranty Statement The warranty for this product gives you specific legal rights. There may also be other rights that vary from area to area. Refer to the user’s documentation for the full warranty and supporting warranty information. 2-10 Service Approach
3 Printer Operation Overview This chapter discusses the following: ● Using the Control Panel ● Control Panel Menus ● Service Mode ● Testing the Printer ● Resetting the Printer ● System Configuration ● Printer I/O Configuration Overview 3-1
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 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 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
Page 108 and 109:
Laser and Scanner Drive Based on in
Page 110 and 111:
The Scanner Motor is controlled and
Page 112 and 113:
Note Printer error messages overrid
Page 114 and 115:
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
Page 132 and 133:
Printing from Tray 1 The presence o
Page 134 and 135:
Printing from Tray 2 When the Forma
Page 136 and 137:
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
Page 146 and 147:
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
Page 168 and 169:
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
Page 176 and 177:
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
Page 248 and 249:
Table 7-8. General Paper Path Troub
Page 250 and 251:
Information Pages From the printer
Page 252 and 253:
Figure 7-6 Sample Menu Map (4050 se
Page 254 and 255:
Printer Information Lists the seria
Page 256 and 257:
Verify Installed Options Under “I
Page 258 and 259:
Note Toner Cartridges are rated for
Page 260 and 261:
Hint If you find a defect that is n
Page 262 and 263:
Table 7-13. Blank Spots Possible Ca
Page 264 and 265:
Table 7-15. Curl Possible Cause Act
Page 266 and 267:
Table 7-17. Distorted Image Possibl
Page 268 and 269:
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
Page 290 and 291:
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
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
Page 334 and 335:
1 Figure 8-7 Engine Controller Boar
Page 336 and 337:
2 1 Figure 8-8 Delivery Drive Assem
Page 338 and 339:
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
Page 346 and 347:
1 2 Figure 8-16 Fuser Assembly (1 o
Page 348 and 349:
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
Page 352 and 353:
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
Page 356 and 357:
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
Page 366 and 367:
4 3 2 1 Figure 8-28 Envelope Feeder
Page 368 and 369:
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:
Page 378 and 379:
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Table 8-34. Numerical Parts List (c
Page 382 and 383:
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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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