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HP Pro 4300 C9H70UT C9H70UT#ABA manual Print quality image defects

Models: Pro 4300 C9H70UT C9H70UT#ABA

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Table 54. Print quality image defects (continued)

See “Black page” on page 322.

See “Blank (or white) page” on page 323.

See “Dark print” on page 324.

312 Troubleshooting

Q2431-90912

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HP Pro 4300 C9H70UT C9H70UT#ABA manual Print quality image defects

Contents

Hp LaserJet Page Service Q2431-90912 Copyright InformationTable of contents Printer operation Removing and replacing parts Troubleshooting Index Viii Table of contents Q2431-90912 List of figures List of figures Q2431-90912 Q2431-90912 List of figures Xii List of figures Q2431-90912 Q2431-90912 List of figures Xiv List of figures Q2431-90912 List of tables Xvi List of tables Q2431-90912 Q2431-90912 List of tables Xviii List of tables Q2431-90912 Contents Printer descriptionPrinter description Q2431-90912 Printer configurations Product configurationsModel and serial numbers Sample model and serial number labelPrinter specifications Site requirementsPhysical dimensions Printer physical dimensionsOff Printer weights without print cartridgePrinter weights General specifications Description HP LaserJet Circuit requirements HP LaserJet 4200 seriesHP LaserJet 4300 series Acoustic ratingsPaper specifications Purchasing a large quantitySupported sizes and weights of media B5 ISOTray 1 Media specifications Duplex accessory media specifications Size Dimensions Weight Envelope feeder accessory Size DimensionsStacker and stapler/stacker do not support card stock Guidelines for using paper Symptom Problem with paper SolutionSupported types of media Submenu onPaper weight equivalence table Paper weight equivalentsLabels Overhead transparenciesEnvelopes Envelope constructionEnvelopes with double-side-seams Envelopes with adhesive strips or flapsCard stock and heavy paper Envelope marginsEnvelope storage Card stock constructionTypes of print media to avoid Safety information Print cartridge and toner safetyLaser safety Laser safety statement U.SEMI statement Korea Vcci statement Japan Laser statement Finland Luokan 1 laserlaite Klass 1 Laser ApparatVaroitus VarningRegulatory information FCC regulationsEnvironmental product stewardship program Returns Non-U.S. returns Material Safety Data Sheet For more informationMaterial restrictions Canadian DOC regulations Declarations of ConformityDeclaration of Conformity Service approach Service approach Parts and suppliesOrdering information Related documentation and software SupportHP PartnerCare HP service agreementsHP-authorized resellers and support Worldwide service and support offices Africa and Middle EastPrint-cartridge information Refilled print cartridgesRecycling print cartridges ReturnsHewlett-Packard limited warranty statement HP Product Duration of WarrantyLimited warranty for toner cartridge life Service approach Q2431-90912 Printer operation Using the control panel Control-panel layoutControl-panel lights Control-panel lights Light IndicationControl-panel buttons Button Function Using the printer Help systemControl-panel buttons Settings and defaults Setting the control-panel display languageSettings and defaults Setting or default ExplanationControl-panel menus OverviewPrinting and changing control-panel menus To print a control-panel menu mapTo change a control-panel setting Retrieve Job menu Information menuRetrieve job menu Values Explanation Information menu ExplanationPaper Handling menu Paper-handling menu Values ExplanationTray N Type ANY Printing submenu Values Explanation Configure Device menuPrinting submenu PCL sub-submenu a submenu in the printing submenu PCL submenu Values ExplanationPrint Quality submenu Print quality submenu Values Explanation321 and Blurred print on page 321 . HP Lines on page 321 and Blurred print onUse the Resolution Enhancement technology REt System Setup submenu System setup submenu Values ExplanationAuto Continue to on Stapler/stacker submenu Stapler stacker submenu Values ExplanationSubmenu O submenu Values ExplanationPrinter maintenance Cleaning the printer and accessories Location of the transfer roller do not touchCleaning the fuser Cleaning the printer Component Cleaning method/notesRunning the cleaning page manually To run the cleaning page manuallyTo run the cleaning page automatically Running the cleaning page automaticallyCleaning spilled toner Maintenance kit part numbers Part name Part number Performing preventative maintenanceResetting the maintenance-kit counter Expected life of components To remove and replace the stapler unit Maintaining the stapler unitRemoving and replacing the stapler unit Replacing the stapler unit 2 Loading staples To load staplesDownloading a remote firmware update Printer maintenance Q2431-90912 Theory of operation Theory of operation Q2431-90912 Printer operating sequence IntroductionBasic operation of the printer Control system overview Pickup and feed system overviewLaser/scanner system overview Image formation system overviewGeneral descriptions DC controller PCAFan Motor and fan controlMotor Power supply Fuser-control circuitFuser over-temperature protection Fuser over-temperature protection circuit block diagramHigh-voltage circuit block diagram High-voltage circuitLow-voltage circuit block diagram Low-voltage circuitOvercurrent/overvoltage protection Toner detectionCartridge detection Cartridge memoryLaser/scanner assembly Laser/scanner assemblyLaser control circuit block diagram Laser/scanner controlPrinter paper pickup and feed block diagram Paper pickup systemPaper pickup/feed and fuser/delivery block diagram Paper pickup and feed blockTray 1 timing diagrams Printing from trayTray 1 pickup Q2431-90912 Theory of operationTray 2 timing diagrams No cassette installed Tray 2, 500-, 1,500-sheet feeder media size detectionLifter-driver operation Multiple feed preventionMedia skew prevention Correcting skewed media pagesFixing/delivery block Printer pickup stationary jam Printer pickup delay jam from trayPrinter jam detection Printer delivery delay jam Printer delivery wrap jam when feeding regular mediaPrinter delivery wrap jam when feeding non-regular media Printer door open jam Printer residual media jamPrinting from the 500-sheet feeder Sheet feeder pickup and feedingSheet feeder pickup and feed diagram 500-sheet feeder I/O block diagram Printing from the 1,500-sheet feeder500-sheet feeder pickup and feed diagram Sheet feeder lifting mechanism 500-sheet feeder lifting mechanismEnvelope feeder I/O block diagram Envelope feederEnvelope feeder pickup and feed diagram Envelope feeder pickup and feedingEnvelope feeder pickup stationary jam Envelope feeder pickup delay jamEnvelope feeder jam detection Duplexer I/O block diagram DuplexerDuplexer pickup and reversing diagram Reversing and duplexer pickupDuplexer jam detection Stacker and stapler/stacker Stacker and stapler/stacker paper pathPower-on sequence for the stacker and stapler/stacker Stacker driver PCA block diagram StackerSwitch Stacker feed and deliveryStacker components Component Purpose SolenoidStacker jam detection Stacker feed jamStacker feed stationary jam Stacker residual media jamStapler/stacker driver PCA block diagram Stapler/stackerStapler/stacker feed and delivery Stapler/stacker components Component PurposeStapler/stacker motors, solenoids, and sensors block diagram Staple mode feed and delivery Staple mode feed and delivery diagram 1Staple mode feed and delivery diagram 2 Staple mode feed and delivery diagram 4 Staple mode feed and delivery diagram 6 Stapler unit I/O block diagram Stapler unitFront view Stapler unit operationStapler unit Staple operation 2 Staple operation 3Stack mode feed and delivery Staple level detectionStapler/stacker jam detection Stapler/stacker feed jamStapler/stacker feed stationary jam Stapler/stacker delivery jamImage-formation system Image formation block diagram Electrostatic latent-image formation Primary chargingWriting the image Writing the image to the photosensitive drumDeveloping the image Developing the imageTransferring the image Transferring the imageFusing the image Q2431-90912 Theory of operation Print cartridge memory chip Print cartridge memory chipFormatter system PowerSaveResolution Enhancement technology EconoMode Input/outputPrinter memory PJL overview Control panelRemoving and replacing parts Page Removal and replacement strategy Before performing serviceAfter completing service Required toolsScrews used in the printer Screw measurement guidePhillips machine screw with captive star washer Phillips screw with self-tapping threadsAccess to the transfer assembly and to the registration Parts-removal treePrinter input tray, and cabinet wheel locks Location of printer, input trays, and cabinet wheel locksPrint cartridge 1 User-replaceable partsPrint cartridge Transfer roller Open the control-panel door and trayTray 1 pickup roller Tray 1 pickup roller 1Tray 1 separation pad Tray 1 separation padTray 2 feed rollers Tray 2 feed rollers 2Tray 2 feed rollers 3 Accessory covers and the tray 2 extension door Covers, tray 1, and the rear output binAccessory covers 3 Formatter cover Top cover Top cover 1Top cover 3 Top cover 4Top cover 5 Right-side cover Right-side cover 1Right-side cover 3 Left-side cover Left-side cover 1Slide the tray 1 door to the right and remove it TrayTray 1 1 Tray 1 3 Tray 1 6 Tray 1 5Slide the paper guide to the left to remove it Rear output bin Rear output bin 1Control-panel display Control-panel overlayControl-panel assembly Control-panel assembly 1Control-panel assembly 2 Control-panel assembly 4 Firmware Dimm Internal componentsFirmware Dimm Formatter assembly Formatter assemblyFuser Output delivery assembly Output delivery assembly rear view, formatter side 1Output delivery assembly 2 Duplexing pendulum assembly Duplexing pendulum assembly 1 oDuplexing pendulum assembly 2 Tray 2 media-size sensor Tray 2 media-size sensor 1Main cooling fan left side Main cooling fan 1Main cooling fan 3 Cooling fan right side HP LaserJet 4300 series printer only Cooling fan HP LaserJet 4300 series only 1Cooling fan HP LaserJet 4300 series only 3 Cooling fan HP LaserJet 4300 series only 5 Laser/scanner 1 Laser/scanner 3 Laser/scanner 4Print-cartridge motor HP LaserJet 4300 series printer only Print-cartridge motor HP LaserJet 4300 series only 1Print-cartridge motor HP Laserjet 4300 series only 1 Remove it Main motorMain motor 1 Main motor 3 Tray 2 lifter-drive assembly Tray 2 lifter-drive assembly 1Tray 2 lifter-drive assembly 2 DC controller PCA 1 DC controller PCA 2 Paper-pickup assembly Paper-pickup assembly 1Paper-pickup assembly 3 Paper-pickup assembly 5 Main drive assembly Main drive assembly 1Main drive assembly 2 Power supply right side 1 Power supply 2 Power supply tray 2 cavity 4 Paper-feed belt assembly Paper-feed belt assembly 1Tray 1 paper-pickup assembly Tray 1 pickup assembly 1Tray 1 pickup assembly 2 Tray 1 pickup assembly 4 Paper feed assembly Paper feed assembly 1Paper-feed assembly 2 Reinstall note Hint Registration assembly Registration assembly 1Registration assembly 3 Transfer assembly Transfer assembly 1Transfer assembly left rear view 2 Transfer assembly 3 Transfer assembly 5 Accessories Sheet feeder assemblySheet feed rollers Sheet feeder right-side coverSheet feeder right-side cover 2 Sheet feeder right-side cover 4 Sheet feeder control PCA Sheet feeder control PCASheet feeder media-size sensor Sheet feeder media-size sensor 1Sheet feeder lifter-drive assembly Sheet feeder lifter-drive assembly 1Sheet feeder paper-pickup drive assembly Sheet feeder paper-pickup drive assembly 1Sheet feeder paper-pickup drive assembly 3 Sheet feeder paper-pickup drive assembly 5 Sheet feeder paper-pickup drive assembly 7 Sheet feeder feed rollers Sheet feeder separation rollerSheet feeder door 500-sheet feeder door 1Sheet feeder door 3 Sheet feeder rear cover 500-sheet feeder rear cover 1500-sheet feeder right-side cover 1 500-sheet feeder right-side cover 3 500-sheet feeder control PCA 1 500-sheet feeder media-size sensor 500-sheet feeder lifter-drive assembly 1 500-sheet feeder lifter-drive assembly 2 500-sheet feeder lifter-drive assembly 4 500-sheet feeder paper-pickup drive assembly Removing and replacing parts Q2431-90912 Troubleshooting Troubleshooting Q2431-90912 Q2431-90912 Troubleshooting Introduction Troubleshooting process Initial troubleshooting checklist Initial troubleshooting checklist Miscellaneous Troubleshooting flowchart Troubleshooting flowchart 1Troubleshooting flowchart 2 Power-on checks OverviewPower-on defect or blank display Problem Action Power-on defect or blank display Troubleshooting tools Information pagesMenu map Sample menu mapConfiguration ConfigurationSupplies status Supplies statusGaining access to the embedded Web server Embedded Web serverNetworking tab Settings tabInformation tab Printer Status and Alerts software Other linksTo select status messages To view status messages and informationUsing control-panel menus Resets submenuResets submenu Values Explanation Information see System Setup submenu onDiagnostics menu Diagnostics menu Values ExplanationService menu service PIN codes For the HP LaserJet 4300 productConverting the Service ID to an actual date Service IDRestoring the Service ID Printer resets and power-on modes Cold resetTo perform a cold reset Nvram initializationPower-on bypass Hard-disk initializationTo initialize the hard disk Skip disk loadSelf test Formatter test Test pagesEngine test Interface troubleshooting EIO troubleshootingCommunications checks Computer direct connect parallel testJetdirect JetdirectDisplay-message troubleshooting Error messagesCritical-error messages Status messagesSee DC controller PCA on Alphabetical printer messagesAlphabetical printer messages Message Description Action Top cover is open or the top Press the H ELP Button for Dimm on Firmware Dimm onSee Configuration page on Switches and sensors onSee Power supply on 336 , 500 -sheet feederSee Fuser on Configuration page onFuser on Stacker or stapler/stacker LED Blinks in amber On page 241 to see ifSheet feeder media Size detection onPrinter has detected that an If the print cartridge appears Stacker or stapler/stacker LED Stacker or stapler/stackerLED blinks in amber See Firmware Dimm on Power supply on See 1,500-sheet feeder Sheet feederControl PCA on Error applies to the stapler/stacker Amber this error applies toStapler/stacker LED is OnlyOn page 340, or Tray was installed with Use the control panel to Configuration of tray XX. The tray Press the S Elect Select the Paper Handling Cartridge on Numerical printer messagesNumerical printer messages Message Description Action See Paper-path Install the paper-feed Assembly sensor flag onSee Printer switches Sheet feeder switchesPrinter switches Correctly installPaper-feed assembly sensor Location of printer switchesSee Location of printer 336 and Fuser onRemoving and replacing JAM in Output Device Functions to OFF Tray 2 feed rollers onDescription Drivers and Software . Check Replace the Dimm or Scanner assembly on ZZ Error NumberFormatter assembly on Cartridge fan error F2 Main fan error F1Air temperature sensor Power supplyDC controller Sensor. See Main coolingLJ 4300 only 59.00, 59.10, 59.20 MotorOr 59.4 EP Motor failure Assembly. See Tray 2 lifter Feeder lifter-drive assemblyPrint-cartridge motor On page 209 or 1,500-sheet60.4 Is offSettings and defaults on Is continuously illuminatedAmber Stapler unit onInitialize Nvram on Initialize the hard disk onCritical hardware error has Turn the printer off and then Paper-path troubleshooting Jam locationsPaper-jam recovery To disable the paper-jam recoveryCommon causes of paper jams Cause Solution Avoiding paper jamsData collection Basic troubleshooting for persistent jamsPersistent jams General paper-path troubleshooting Paper-path checklistPaper-path test To perform a paper- testCauses of tray 1 jams Solution Causes of tray 2 jams SolutionTray 1 paper-pickup assembly on Drive assembly on page 179 and/or PrinterCauses of tray 3 and or tray 4 jams Solution Jams in tray 3 and/or trayCauses of paper-path jams Solution Causes of duplex path jams SolutionDrive assembly on Jams in the paper pathMedia transport problems Causes for multiple pages feeding SolutionCause Solution Multiple pages feedPaper is skewed Causes for skewed paper SolutionRegistration assembly on Image-formation troubleshooting Print quality problems associated with mediaOverhead transparency defects Print quality problems associated with the environmentPrint quality problems associated with jams Does the problem repeat on the page? HP paper specificationImage defects Image qualityCheck the print cartridge EconoModeHalf self-test functional check Drum rotation functional checkImage defect tables Print quality image defectsPrint quality image defects Light print partial Possible cause Recommended actions Light print entire Possible cause Recommended actionSpecks or dots Possible cause Recommended action Dots in the paper path directionMight cause problems if the paper is Have this problem because they are notCartridge Wrong toner density setting Wrong fuser setting for media typeHorizontal lines opposite the paper path direction Grey background Possible cause Recommended actions Repeating defects and repeating images Distorted imagesCreases Possible cause Recommended actions Skew Possible cause Recommended actionsCurl or wave Possible cause Recommended actions White lines opposite the paper path Line detail setting is turned off White spots on black Possible cause Recommended actionsScattered lines Possible cause Recommended actions Blurred print Possible cause Recommended actionsReplace the laser/scanner assembly. See Laser/scanner BlackBlank or white Possible cause Recommended actions Dark print Repetitive defects troubleshooting Repetitive defect rulerTroubleshooting the stacker and the stapler/stacker Initial checksJam errors Stacker and stapler/stacker paper pathStacker paper path test Delivery area Printer connection areaStapler/stacker paper path test DamagedQ2431-90912 Troubleshooting Paper transport error troubleshooting Paper transport errorsMalfunction errors Component errors Printer component locations Main printer partsLocation of main printer parts 2 Location of main printer parts 3 Location of main printer parts 4 Printer switches and sensors Location of printer switches and sensorsPrinter motors and fans Location of printer motors and fansPrinter PCAs Location of printer PCAsAccessory component locations Sheet feeder main partsSheet feeder switches, sensors, solenoids, and PCAs Location of 1,500-sheet paper feeder main parts 1 Location of 1,500-sheet paper feeder main parts 2 Sheet feeder switches, sensors, solenoids, and PCAs Stapler/stacker stapler assembly Location of the stapler/stacker stapler unitStacker and stapler/stacker switches and sensors Stacker and stapler/stacker motors and solenoids Stacker and stapler/stacker PCAs Location of the stacker and stapler/stacker PCAsPrinter and accessory wiring diagrams HP LaserJet 4200 wiring diagramHP LaserJet 4300 wiring diagram Sheet feeder wiring diagram 500-sheet feeder wiring diagram Duplex accessory wiring diagram Envelope feeder accessory wiring diagram Stacker accessory wiring diagram Stapler/stacker accessory wiring diagram DC controller block diagram DC controller topGeneral timing diagrams HP LaserJet 4200 general timing diagramHP LaserJet 4300 general timing diagram Stapler/stacker timing diagram Troubleshooting Q2431-90912 Parts and diagrams Ordering parts, supplies, and getting support Ordering informationHP-authorized resellers and support Accessories and supplies Memory, fonts, and mass storage Part number Exchange number Cables and interfaces Part number Exchange numberPrinter maintenance kit Part number Exchange numberHow to use the parts lists and diagrams Documentation Part number Description or useParts diagrams and lists External covers and panelsExternal covers and panels Part number Description Reference Main assemblies 1 Main assemblies 1 Part number Description Reference Main assemblies 2 Main assemblies 2 Part number Description Reference Main assemblies 3 Main assemblies 3 Part number Description Reference Right-side assemblies Part number Description Reference 110-127v 220-240v Main drive assembly Part number Description Reference Paper-pickup assembly Part number Description Reference RM1-0002-000CN Duplexing pendulum assembly RM1-0033-000CN Lifter-drive assembly, tray Paper pickup assembly Part number Description Reference Paper-feed assembly Part number Description Reference Registration assembly Part number Description Reference Tray 1 assembly Part number Description Reference Output delivery assembly Part number Description Reference Transfer assembly Transfer assembly Part number Description ReferenceFuser Parts and diagrams Q2431-90912 Fuser Part number Description Reference Parts and diagrams Q2431-90912 Q2431-90912 Parts and diagrams Sheet feeder main assemblies 2 Q2431-90912 Parts and diagrams RM1-0056-000CN Paper-pickup assembly 500-sheet feeder RM1-0208-000CN Lifter-driver assembly 500-sheet feeder Sheet tray Sheet tray Part number Description ReferenceQ2431-90912 Parts and diagrams 500-sheet feeder main assemblies Paper size sensing assembly outside, 1,500-sheet feeder Parts and diagrams Q2431-90912 RM1-0287-000CN Lifter-drive assembly, 1,500-sheet feeder Parts and diagrams Q2431-90912 Q2431-90912 Parts and diagrams Parts and diagrams Q2431-90912 Alphabetical parts list Alphabetical pars list Part number Description ReferenceAlphabetical pars list Part number Description Reference Paper size sensing assembly outside, 1,500-sheet feeder Alphabetical pars list Part number Description Reference Numerical parts list Numerical pars list Part number Description ReferenceNumerical pars list Part number Description Reference Numerical pars list Part number Description Reference Paper size sensing assembly outside, 1,500-sheet feeder Index Index Q2431-90912 Cassettes. See trays CD-ROM, software Index Q2431-90912 EIO Index Q2431-90912 See also support troubleshooting Help button 36 LED PCA Q2431-90912 Index Index Q2431-90912 Q2431-90912 Index See also bins Q2431-90912 Index Index Q2431-90912 LED PCA TCP/IP See also trays See also messages troubleshooting problem areas Page Q2431-90912