HP LaserJet 4000 and 4050 Series Printers Service Manual

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Service Approach Repair of the printer normally begins with use of the printer’s internal diagnostics in conjunction with the troubleshooting procedures in Chapter 7. Once a faulty part is located, repair is generally accomplished by assembly level replacement of Field Replaceable Units (FRUs). Some mechanical assemblies may be repaired at the subassembly level. PCA component replacement is not supported by Hewlett-Packard. 2-2 Service Approach
Parts and Supplies Ordering Information Field replaceable and accessory part numbers are found in Chapter 8 of this manual. Replacement parts may be ordered from HP’s Service Materials Organization (SMO) or Support Materials Europe (SME), divisions of Product Support Division (PSD). Use only accessories specifically designed for this printer. Accessories can be ordered from an authorized service or support provider. See page 2-6 and page 8-4 for ordering information. Parts and Supplies 2-3
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 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
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Power Supply System AC/DC Power Dis
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High-voltage Power Distribution Fig
Page 102 and 103:
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
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Writing the Image During the writin
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Transferring the Image During the t
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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
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Table 6-1. Screws Used in the Print
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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
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Fan Figure 6-21 Removing the Fan 1
Page 172 and 173:
Transfer Roller DO NOT TOUCH! (See
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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
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Engine Controller Board Note After
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Adjusting the Top Margin When you r
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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
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Troubleshooting Flowchart Figure 7-
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Troubleshooting the Printing System
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Table 7-2. Power On Defect or Blank
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Table 7-4. No DC Power Cause Action
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Figure 7-2 Location of the Engine T
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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 224 and 225:
Page 226 and 227:
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Page 232 and 233:
Table 7-6. Numerical Printer Messag
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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
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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
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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
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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
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PCAs Figure 7-28 Location of PCAs 7
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Sensors and Thermistor Figure 7-29
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Table 7-41. Sensors and Thermistor
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Figure 7-32 Location of Solenoids a
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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
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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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