HP 4050, 4000 manual Screws Used in the Printer Drawing and Description Purpose

Page 150

Table 6-1. Screws Used in the Printer

Drawing and Description	Purpose

Used to fasten metal to metal when good electrical contact is needed.

Threaded Phillips with captive star washer

Used to fasten metal or plastic to plastic mainframes.

Silver Self-tapping Phillips screw

Used to fasten metal or plastic to plastic mainframes.

Black Self-tapping Phillips screw

Used to fasten metal or plastic to threaded plastic or metal.

Threaded Phillips screw with lock and flat washer

6-4Removing and Replacing Parts

Image 150

Contents HP LaserJet 4000 Series Printers Page HP LaserJet 4000 and 4050 Series Printers Copyright Hewlett-Packard Company Contents Contents-2 Printer OperationContents-3 Functional InformationRemoving and Replacing Parts Contents-4Troubleshooting Contents-5Contents-6 Printer Description OverviewPrinter Features Printer Features for the HP LaserJet 4000 Series PrinterSheet Tray Printer Features for the HP LaserJet 4050 Series Printer SpeedSheet Tray 2 HP LaserJet 4050/ 4050 N 6Printer Description LocalTalk 10/100 Base TX Identification Model and Serial NumbersSite Requirements Printer Weight without Toner Cartridge Space RequirementsAcoustic Emissions Per ISO Printer State Sound Power Environmental RequirementsPaper Specifications EnvelopesLegal By 14 14Printer Description Supported Types of Paper Maximum Size By 10 178 by 254 mmGuidelines for Using Paper Cutouts or perforationsSuch as those used in some types of thermography Paper Weight Equivalence Table 15. Paper Weight EquivalenceLabels TransparenciesLabel Construction Envelopes Envelope ConstructionEnvelopes with Double Side Seams Envelopes with Adhesive Strips or FlapsEnvelope Margins Envelope Storage16. Envelope Margins Type of Address Top Margin Left Margin Card Stock and Heavy Paper Card Stock ConstructionCard Stock Guidelines Safety Information Laser Safety StatementCanadian DOC Regulations FCC Regulations Laser Statement for Finland Laserturvallisuus Luokan 1 Laserlaite Klass 1 Laser ApparatToner Safety Printer design eliminates Environmental Product StewardshipProtecting the Environment Printer design reducesService Approach Service Approach Parts and Supplies Ordering InformationHelpful Documentation Helpful Documentation Description or UseHelpful Documentation Description or Use Part Number Exchange Program HP Service Parts Information Compact DiscPhone Numbers for Ordering ConsumablesHP Support Assistant Compact Disc North and Latin AmericaAsia/Pacific Customer Care Reseller Sales and Service Support Center Europe, Middle East, and AfricaOther Areas Toner Cartridge Information Refilled Toner CartridgesRecycling Toner Cartridges Warranty Statement Printer Operation Control Panel Lights Using the Control PanelControl Panel Layout ReadyControl Panel Keys Paper SizeControl Panel Keys Function Settings and Defaults Settings and DefaultsSetting the display language Setting or Default ExplanationTo change a Control Panel setting Control Panel MenusTo print a Control Panel menu map Quick Copy Jobs Menu Quick Copy Jobs MenuPrivate/Stored Jobs Menu Private/Stored Jobs MenuInformation Menu Print Menu MAPInformation Menu ItemExplanation SIZE=COM10 Paper Handling MenuEnvelope Feeder TYPE=PLAINTray 2 TYPE= Tray 1 TYPE=Plain Tray 3 TYPE=TYPE=NORMAL Normallow High Configure Fuser Mode MENU=NOOverride A4 LETTER=NO ROUGH=HIGHFastres RESOLUTION=Print Quality Menu Print Quality Menu ValuesRET=MEDIUM OFF Light DarkECONOMODE=OFF Cleaning Toner DENSITY=3 CreateProcess Printing Menu Unit of MEASURE= Inches Inches Millimeters Configure CustomDIMENSION= FORM=PCL Font Internal SOURCE=INTERNAL Soft PCL Font NUMBER=0Printing Menu Values COURIER=REGULAR Regular Dark PCL SymbolSET=PC-8 Wide A4=NOPrint PS ERRORS=OFF Append CR to LF=Configuration Menu Resource SAVE= 10. Configuration Menu ItemValues PROTECT=Clearable JOB Auto CONTINUE= RAM DISK=OFF RAM Disk SIZE=XXXK Continue Stop Auto Auto OFF JAM RECOVERY=Maintenance OFF MESSAGE=OFF Small Paper SPEED=NORMAL SlowQuick Copy Timeout = OFFConfigure YES Prores 1200=NO Held JOBBUFFER=AUTO Auto TIMEOUT=15Menu Buffer SIZE=Parallel ADV FUNCTIONS=ON Parallel HighSPEED=YES SERIALDTR/DSR PACING=DTR/DSR XON/XOFFSerial DTR Serial RobustSerial Baud POLARITY=HIGHEIO Menu Networked Printers CFG TCP/IP=NO CFG ETALK=NOResets Menu Accessory. HP LaserJet 4050 series printer only13. Resets Menu Service Mode To enter Service ModeService Menu Setting the Page Count, Maintenance CountSerial Number Menu CountMode 14. Changing the Page Count Key Press Display DescriptionMaintenance Page Count PAGES=0Clear Event Log Cold Reset PaperDiagnostics Serial NumberTesting the Printer Engine TestTo perform a Cold Reset Resetting the PrinterCold Reset Clearing NvramSystem Configuration MS-DOS System ConfigurationParallel DOS Commands Serial MS-DOS Commands Printer I/O Configuration Serial ConfigurationParallel Menu Pacing Handshaking Printer Maintenance Cleaning the Printer and Accessories Cleaning the Printer Component Cleaning Method / Notes Inside GeneralCleaning Spilled Toner Using the Printer CleaningPreventative Maintenance Reset Maintenance CountExpected Life of Components Functional Information Power Supply System AC/DC Power DistributionOvercurrent Overvoltage Protection High-voltage Power Distribution Toner Cartridge Detection Engine Controller System 3Engine Controller Board Engine Controller System Engine Controller Board Inputs and Outputs 4Engine Controller Board I/O 1 8Functional Information5Engine Controller Board I/O 2 Engine Controller System 6Engine Controller Board I/O 3 10Functional Information 7Engine Controller Board I/O 4 Engine Controller System Paper Motion Monitoring and Control Solenoids, Sensors, Clutches, and SwitchesLaser and Scanner Drive Engine Test PrintMotors Page PowerSave Formatter SystemResolution Enhancement technology REt EconoModeExpanded I/O Input/OutputParallel Interface HP Fast InfraRed ReceiverLocal Talk I/O Printer MemoryDisk Read Only Memory ROMNon-Volatile Memory Nvram Random Access Memory RAMDimm Slots Memory Enhancement technology MEtProtect PJL OverviewPML Control PanelImage Formation System Page Toner Cartridge Toner CartridgePhotosensitive Drum 11Photosensitive Drum Image Formation SystemCleaning the Drum 12Cleaning the Drum 26Functional InformationConditioning the Drum 13Primary Charging Roller Image Formation SystemWriting the Image Developing the Image Transferring the Image 16Transferring the Image 30Functional InformationImage Fusing/Variable Fusing Temperature Variable Fusing Temperature Paper Feed System 19Paper Feed Subsystem Paper Feed SystemPaper Path Clutches and Sensors Printing from Tray 21Tray 1 Pickup Timing 36Functional InformationTray 1 Pickup 23Tray 2 Pickup Timing 38Functional Information Tray 2 Pickup Multi-Feed Prevention Mechanism 25Multi-Feed Prevention Mechanism 40Functional InformationPrinting from the Optional 500-sheet Universal Tray 26Paper Feeder Driver I/O Paper Feed SystemPickup and Feeding 28Paper Feed Pickup Paper Feed System Envelope Feeder Envelope Feed30Envelope Feed Pickup Paper Feed System Duplexer Reversing and Duplexer Pickup31Paper Path for the Duplexer Paper Feed System Paper Jam 32Paper Feed for the DuplexerBasic Sequence of Operation Printer Timing Period PurposeTiming Diagram Removing and Replacing Parts Removal and Replacement Strategy Tools Screws Used in the PrinterScrews Used in the Printer Drawing and Description Purpose Hint Removing Covers Rear Right Side CoverTop Cover Control Panel OverlayControl Panel Toner Cartridge Drive Arm Toner cartridge drive arm Rear screws Top screws Release tab if necessary Left Side Cover CatchesFront Right Side Cover Rear Cover/Rear Output Bin Tray Page Detail of the Tray 1 Sensor Arm Cover Removing Assemblies FuserPage Formatter Cage Assembly Output Assembly Page Laser Scanner Fan Main Motor Transfer Roller Tray 1 Pickup Roller Page Tray 1 Pickup Assembly Envelope feeder connector coverPage Step Toner cartridge guide Right Side Toner Cartridge Guide Registration Assembly Do not Remove Paper Feed Assembly Removing the upper screws from the Paper Feed Assembly By inserting it into the slot, as shown Formatter Pan Gear Train Delivery Drive Assembly Separating the Engine Module from the Paper Feed Module Page Back, not on the board Spring Power switch rod Engine Controller BoardRod Adjusting the Top Margin Measure this distance Paper Feed Rollers Separation Rollers Paper Feed Module Plate Paper Feed Module Gear Train Assembly Paper Feed Module Side Rails Page PCA Cover HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN PCA Cover HP LaserJet 4000/4000 N and 4050/4050 N PCA Controller Troubleshooting Troubleshooting Process Major Steps for TroubleshootingMajor Steps for Troubleshooting Troubleshooting Flowchart 1Troubleshooting Flowchart 1 4TroubleshootingTroubleshooting Flowchart Troubleshooting Process Troubleshooting the Printing System Preliminary Operating ChecksPower On Defect or Blank Display Power OnCan assist in locating printing errors Problem ActionPower On Defect or Blank Display ProblemAction If the Fan is not workingNo AC Power Cause Action Defective AC receptacle or AC power lineNo DC Power Cause Action Engine Test Location of Engine Test ButtonDisplay Printing an Engine TestEvent Log Most recent error up to Display the Event Log Print the Event LogInterpret the Event Log Shows a typical Event Log. The Event Log showsPrinter Messages Cannot Duplex Rear BIN Open Check Input Device BAD DuplexerConnection Message ActionDisk Device Failure Disk FileSystem is Full Disk is Write Protected Not FunctionalFlash File System is Full Install Tray Flash is Write ProtectedDo not Power OFF Loading Program NumberPerform Printer Maintenance OfflineRAM Disk Device Failure RAM Disk File Operation FailedTray X Empty Tray X Load Type Size One of the following occurredFeeder Installed Unsupported Size in Tray YY USE Type Size INSTEAD?Wrong Envelope XX Paper JAM Location For 13.20 Insufficient Memory Press GO to ContinueParallel I/O Buffer Overflow Press GO to Continue Serial I/O Buffer OverflowBAD Serial Transmission Printer Error Fuser Error 4Fuser connectors Troubleshooting the Printing System36Troubleshooting 53.XY.ZZ 38Troubleshooting 62.X 69.X Xxxx Printer Error 8X.YYYY Disk volume not present it may be uninitialized Disk Error Error Description Solution Number Directories has been reachedGeneral Paper Path Troubleshooting Page Paper Path Test Press Item until Print Paper Path Test appearsInformation Pages Menu MapPage 6Sample Menu Map 4050 series printer 50Troubleshooting Configuration Printer Information Installed Paper Personalities Verify Installed Options Image QualityImage Quality Checks Image Quality Checks Action Check the Toner Cartridge EconoMode Image Defects High-voltage power supply connections are contaminated 11. Black Possible Cause Action12. Blank Possible Cause Action Voltage13. Blank Spots Possible Cause Action14. Creases Possible Cause Action Check the paper or other print media type15. Curl Possible Cause Action For paper type16. Contamination on Back Possible Cause Action 17. Distorted Image 18. Dropouts Possible Cause Action 19. Faded Print/Bubbles Possible Cause Action20. Gray Background Possible Cause Action 21. Horizontal Black Lines Possible Cause Action 22. Horizontal Smudges Possible Cause Action23. Horizontal White Lines Possible Cause Action 24. Light Print, Dark Print, or Fade Possible Cause Action 25. Loose Toner Possible Cause Action 26. Repetitive Defects27. Skew Possible Cause Action 28. Toner Smear Possible Cause ActionPaper SPEED=SLOW 29. Toner Specks Possible Cause Action30. Vertical Black Lines 31. Vertical Dots 32. Vertical White Lines9Repetitive Defect Ruler Troubleshooting the Printing System Repetitive Defect RulerImage System Troubleshooting Half Self Test Functional CheckDrum Rotation Functional Check High-voltage Power Supply Functional Check 33. High Voltage System Checks ActionCommunications Check Interface TroubleshootingEIO Troubleshooting Test MessagePage Page HP JetDirect Configuration AUTOEXEC.BAT Standard Configurations Parallel DOS CommandsSerial DOS Commands Communications Checks 34. Communications Checks ChecksActionFor Serial Communications Only 34. Communications Checks ChecksAction Reference Diagrams Locations of Components35. Components in Figure Page 13Components of the Duplexer Reference Diagrams Page 15Components of the Envelope Feeder Reference Diagrams 17Paper Path with the Duplexer 90Troubleshooting Paper Path18Paper Path with the Envelope Feeder Reference Diagrams 36. Paper Sensors in Figure 37. Engine Controller Board Layout SW1Paper Size Detection Switches OFF 24Location of Motors 39. Motors in FigureConnectors 25Connectors 1 Reference Diagrams26Connectors 2 98Troubleshooting Page 28Location of PCAs 100Troubleshooting PCAs40. Location of PCAs 29Location of Sensors and Thermistor 1 102Troubleshooting Sensors and Thermistor30Location of Sensors and Thermistor 2 41. Sensors and Thermistor in -29 and Figure104Troubleshooting 31Location of Solenoids and Clutch 1 Reference Diagrams Solenoids and Clutch32Location of Solenoids and Clutch 2 106Troubleshooting 42. Solenoids and Clutch in -31 and Figure Switches 33Location of Switches 108Troubleshooting43. Switches in Figure Timing 34Pickup Timing for Tray 2 and lower traysParts and Diagrams How To Use the Parts Lists and Diagrams Ordering PartsOrdering Consumables Replacement parts and cannot be ordered Accessories and Supplies Accessories and Supplies Description Exchange No Product NoAccessories and Supplies Description Exchange No. Product No Common Screws and Replacement Cables Screws Used in the Printer DescriptionReplaceable Cables Description Table No Item No Illustrations and Parts Lists 1Assembly Location Diagram 8Parts and DiagramsFormatter C4251-69001 4050 only 2External Covers and Panels 10Parts and Diagrams Illustrations and Parts Lists 3Top Cover Assembly 12Parts and Diagrams Top Cover Assembly Item No Quantity Description 1211 Internal Components 1 Item No. Part No Quantity Description 13 12 227 Internal Components 2 Item No Quantity Description 18Parts and Diagrams Illustrations and Parts Lists 6Internal Components 3 20Parts and Diagrams Internal Components 3 Item No Quantity Description 7Engine Controller Board Assembly 22Parts and Diagrams Illustrations and Parts Lists 8Delivery Drive Assembly 11. Delivery Drive Assembly Item No Quantity Description9Printer Drive Assembly 12. Printer Drive Assembly Item No Quantity Description10Tray 1 Pickup Assembly 26Parts and Diagrams 13. Tray 1 Pickup Assembly Item No Quantity Description 11Tray 1 Assembly 14. Tray 1 Assembly Item No Quantity Description12Paper Feed Assembly 15. Paper Feed Assembly Item No Quantity Description13Registration Assembly 16. Registration Assembly Item No Quantity Description17. Paper Feed Guide Assembly Item No Quantity Description 15Delivery Assembly 32Parts and Diagrams 18. Delivery Assembly Item No Quantity Description 16Fuser Assembly 1 17Fuser Assembly 2 614 Connector 250- and 500-sheet Feeder Paper Pickup Drive Assembly 22. Paper Pickup Drive Assembly Item No Quantity Description Sheet Tray 23 -sheet Tray Item No Quantity Description Page Illustrations and Parts Lists Page Connector 250- and 500-sheet Feeder 23Upper Paper Pickup Drive Assembly 24Lower Paper Pickup Drive Assembly 48Parts and Diagrams 28 -sheet Tray Item No Quantity Description Page XD2-1100-502CN Ring, E RG5-2690-000CN Page Illustrations and Parts Lists 28Envelope Feeder 54Parts and Diagrams 31. Envelope Feeder Item No Exchange No Quantity Description 29Internal Components of Duplexer 56Parts and Diagrams Illustrations and Parts Lists Alphabetical Parts List RB1-8907-000CN 25 on Tray 60Parts and Diagrams Mrom 62Parts and Diagrams Illustrations and Parts Lists 64Parts and Diagrams Toner Cartridge 6,000 Pages 66Parts and Diagrams Numerical Parts List 68Parts and Diagrams Illustrations and Parts Lists 70Parts and Diagrams Mounting Assembly Separation 72Parts and Diagrams Illustrations and Parts Lists 74Parts and Diagrams Index Index-1Index-2 Index-3 Index-4 Wiring Diagram HP LaserJet 4000/4000N Wiring Diagram HP LaserJet 4000 T/4000TN Page C4251-91003

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