HP LaserJet 4000 and 4050 Series Printers Service Manual

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Table 1-2. Printer Features for the HP LaserJet 4050 Series Printer Speed 17 pages per minute (ppm) 133 MHz RISC microprocessor First page out = 15 sec. “RIP ONCE” capability with 16 MB or hard disk option Resolution 300 dpi with PCL5e/HP’s PostScript TM Level 2 emulation (PS) 600 dpi with PCL5e/PS HP FastRes 1200 (PCL6, PS) HP ProRes 1200 at engine speed (17 ppm) (PCL6, PS) Typefaces 110 Scalable TrueType TM (80 built-in, 30 via HP FontSmart, all PS and PCL accessible) Euro symbol Memory Options HP LaserJet 4050/4050 T: 8 MB RAM standard HP LaserJet 4050 N/4050 TN: 16MB RAM standard Optional Memory: 4, 8, 16, MB EDO DIMMs 4, 8, 16, 32, 64 MB SDRAM DIMM Mass Storage Options 2 and 4 MB Flash DIMMs Greater than 1 GB hard disk Expansion Slots 3 100-pin DIMM slots 2 enhanced I/O (EIO) slots Interface Bidirectional IEEE 1284-compliant parallel 10/100Base-TX (HP LaserJet 4050 N/4050 TN) HP Fast InfraRed Receiver (FIR) RS232 9-pin serial Paper Handling Connector (PHC) Optional Networking 10Base-T and 10Base-2 10/100Base-TX Token Ring LocalTalk 1-4 Printer Description
Table 1-2. Printer Features for the HP LaserJet 4050 Series Printer (continued) Paper Trays 100-sheet Tray 1 ● Size: 3 by 5 to legal (76 by 127 mm to 216 by 356 mm) 500-sheet Tray 2 (HP LaserJet 4050/ 4050 N) ● Size: letter, legal, A4 250-sheet Trays 2 and 3 (HP LaserJet 4050 T/ 4050 TN) ● Size: letter, A4, executive, legal, B5 (ISO), B5 (JIS), A5 Optional 500-sheet Universal Tray ● Supports standard and custom sizes from 5.8 by 8.2 in (149 by 210 mm) to 8.5 by 14 in (216 by 356 mm). Paper Path Straight through from Tray 1 to Rear Output Bin or to Top Output Bin Output Capacity 250-sheet Top Output Bin 50-sheet Rear Output Bin Paper Handling Options Duplexer, Envelope Feeder, Optional 500-sheet Universal Tray Assembly Printer Features 1-5
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 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 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
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Service Mode Service Mode should be
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Page Count The page count stored in
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MAINTENANCE COUNT in the Service Mo
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Resetting the Printer Cold Reset Co
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Serial MS-DOS Commands Most IBM com
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Pacing (Handshaking) Pacing (or “
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Cleaning the Printer and Accessorie
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Using the Printer Cleaning Page If
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Expected Life of Components The fol
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Power Supply System AC/DC Power Dis
Page 100 and 101:
High-voltage Power Distribution Fig
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Engine Controller System The follow
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Engine Controller Board Inputs and
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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
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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
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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
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Pickup and Feeding The Paper Feeder
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Envelope Feeder The operation seque
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Duplexer The operation sequences of
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Figure 5-32 Paper Feed for the Dupl
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Figure 5-33 Timing Diagram 5-50 Fun
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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
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Toner cartridge drive arm Rear scre
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Left Side Cover Latch (inside) Catc
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Rear Cover/Rear Output Bin Step 2 S
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Figure 6-12 Removing the Tray 1 Sen
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Removing Assemblies The order in wh
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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
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Toner cartridge guide Figure 6-29 R
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Registration Assembly Figure 6-31 R
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Paper Feed Assembly 1 Remove the fo
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Hint For replacement of the Paper F
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Gear Train Toner Cartridge Drive Ar
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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
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Paper Feed Module Plate Remove the
Page 198 and 199:
Paper Feed Module Side Rails Remove
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PCA Cover (HP LaserJet 4000 T/4000
Page 202 and 203:
PCA Controller This procedure is th
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Troubleshooting Process The trouble
Page 206 and 207:
Troubleshooting Flowchart Figure 7-
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Troubleshooting the Printing System
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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
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Interpret the Event Log The Event L
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Table 7-5. Alphabetical Printer Mes
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Page 232 and 233:
Table 7-6. Numerical Printer Messag
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Page 244 and 245:
Page 246 and 247:
Disk Error Number Error Description
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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
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Table 7-27. Skew Possible Cause Act
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Table 7-31. Vertical Dots Possible
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Image System Troubleshooting Half S
Page 278 and 279:
High-voltage Power Supply Functiona
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Network statistics I/O card status
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HP JetDirect Configuration ● ●
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Communications Checks Table 7-34. C
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Reference Diagrams Locations of Com
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Figure 7-12 Components of the Paper
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Figure 7-14 Components of the Fusin
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Paper Path Figure 7-16 Paper Path (
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Figure 7-19 Paper Sensors and the P
Page 296 and 297:
Paper Size Detection Switches Figur
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Motors Figure 7-24 Location of Moto
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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
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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
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Timing Figure 7-34 Pickup Timing fo
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How To Use the Parts Lists and Diag
Page 316 and 317:
Accessories and Supplies The follow
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Common Screws and Replacement Cable
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Illustrations and Parts Lists Top C
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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
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23 21 20 1 19 18 17 2 15 16 3 4 5 6
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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
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1 Figure 8-13 Registration Assembly
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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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Table 8-34. Numerical Parts List (c
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Engine Controller Board Assembly 8-
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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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