Top cover 3, Top cover 4 | HP Pro 4300 C9H70UT C9H70UT#ABA specification

4.Use needle-nose pliers to release the print-cartridge drive-arm (callout 3).

Hint	Push the drive-arm back into the printer to avoid damaging it when you remove the top cover.

3

Figure 76.	Top cover (3 of 5)
	5. Open tray 1 and the rear door. Grasp the top cover and carefully rotate the left edge up and
	away from the printer. Do not apply stress to the control-panel wire-harness (callout 4) when
	rotating the top cover away from the printer.

4

Figure 77.

Top cover (4 of 5)

Q2431-90912

Chapter 6 Removing and replacing parts 147

Image 167

HP Pro 4300 C9H70UT C9H70UT#ABA manual Top cover 3, Top cover 4

Contents

Hp LaserJet Page Service Copyright Information Q2431-90912 Table 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 Printer description Contents Printer description Q2431-90912 Product configurations Printer configurations Sample model and serial number label Model and serial numbers Site requirements Printer specifications Printer physical dimensions Physical dimensions Off Printer weights without print cartridgePrinter weights Acoustic ratings General specifications Description HP LaserJetCircuit requirements HP LaserJet 4200 series HP LaserJet 4300 series Purchasing a large quantity Paper specifications B5 ISO Supported sizes and weights of media Tray 1 Media specifications Envelope feeder accessory Size Dimensions Duplex accessory media specifications Size Dimensions Weight Stacker and stapler/stacker do not support card stock Submenu on Guidelines for using paperSymptom Problem with paper Solution Supported types of media Paper weight equivalents Paper weight equivalence table Overhead transparencies Labels Envelopes with adhesive strips or flaps EnvelopesEnvelope construction Envelopes with double-side-seams Card stock construction Card stock and heavy paperEnvelope margins Envelope storage Types of print media to avoid Laser safety statement U.S Safety informationPrint cartridge and toner safety Laser safety EMI statement Korea Vcci statement Japan Varning Laser statement FinlandLuokan 1 laserlaite Klass 1 Laser Apparat Varoitus FCC regulations Regulatory information Environmental 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 Support Service approachParts and supplies Ordering information Related documentation and software HP PartnerCare HP service agreementsHP-authorized resellers and support Africa and Middle East Worldwide service and support offices Returns Print-cartridge informationRefilled print cartridges Recycling print cartridges HP Product Duration of Warranty Hewlett-Packard limited warranty statement Limited warranty for toner cartridge life Service approach Q2431-90912 Printer operation Control-panel lights Light Indication Using the control panelControl-panel layout Control-panel lights Control-panel buttons Button Function Using the printer Help systemControl-panel buttons Setting or default Explanation Settings and defaultsSetting the control-panel display language Settings and defaults To print a control-panel menu map Control-panel menusOverview Printing and changing control-panel menus To change a control-panel setting Information menu Explanation Retrieve Job menuInformation menu Retrieve job menu Values Explanation Paper-handling menu Values Explanation Paper Handling menu Tray N Type ANY Printing submenu Values Explanation Configure Device menuPrinting submenu PCL submenu Values Explanation PCL sub-submenu a submenu in the printing submenu Print quality submenu Values Explanation Print Quality submenu Lines on page 321 and Blurred print on 321 and Blurred print on page 321 . HP Use the Resolution Enhancement technology REt System setup submenu Values Explanation System Setup submenu Auto Continue to on Stapler stacker submenu Values Explanation Stapler/stacker submenu O submenu Values Explanation Submenu Printer maintenance Location of the transfer roller do not touch Cleaning the printer and accessories Cleaning the printer Component Cleaning method/notes Cleaning the fuser To run the cleaning page manually Running the cleaning page manually To 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 To load staples Loading staples Downloading a remote firmware update Printer maintenance Q2431-90912 Theory of operation Theory of operation Q2431-90912 Printer operating sequence IntroductionBasic operation of the printer Image formation system overview Control system overviewPickup and feed system overview Laser/scanner system overview DC controller PCA General descriptions Fan Motor and fan controlMotor Fuser-control circuit Power supply Fuser over-temperature protection circuit block diagram Fuser over-temperature protection High-voltage circuit High-voltage circuit block diagram Low-voltage circuit Low-voltage circuit block diagram Cartridge memory Overcurrent/overvoltage protectionToner detection Cartridge detection Laser/scanner assembly Laser/scanner assembly Laser/scanner control Laser control circuit block diagram Paper pickup system Printer paper pickup and feed block diagram Paper pickup and feed block Paper pickup/feed and fuser/delivery block diagram Printing from tray Tray 1 timing diagrams Q2431-90912 Theory of operation Tray 1 pickup Tray 2 timing diagrams Tray 2, 500-, 1,500-sheet feeder media size detection No cassette installed Multiple feed prevention Lifter-driver operation Correcting skewed media pages Media skew prevention Fixing/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 residual media jam Printer door open jam Sheet feeder pickup and feeding Printing from the 500-sheet feeder Sheet feeder pickup and feed diagram Printing from the 1,500-sheet feeder 500-sheet feeder I/O block diagram 500-sheet feeder pickup and feed diagram 500-sheet feeder lifting mechanism Sheet feeder lifting mechanism Envelope feeder Envelope feeder I/O block diagram Envelope feeder pickup and feeding Envelope feeder pickup and feed diagram Envelope feeder pickup stationary jam Envelope feeder pickup delay jamEnvelope feeder jam detection Duplexer Duplexer I/O block diagram Reversing and duplexer pickup Duplexer pickup and reversing diagram Duplexer jam detection Stacker and stapler/stacker paper path Stacker and stapler/stacker Power-on sequence for the stacker and stapler/stacker Stacker Stacker driver PCA block diagram Solenoid SwitchStacker feed and delivery Stacker components Component Purpose Stacker residual media jam Stacker jam detectionStacker feed jam Stacker feed stationary jam Stapler/stacker Stapler/stacker driver PCA block diagram Stapler/stacker components Component Purpose Stapler/stacker feed and delivery Stapler/stacker motors, solenoids, and sensors block diagram Staple mode feed and delivery diagram 1 Staple mode feed and delivery Staple mode feed and delivery diagram 2 Staple mode feed and delivery diagram 4 Staple mode feed and delivery diagram 6 Stapler unit Stapler unit I/O block diagram Front view Stapler unit operationStapler unit Staple operation 3 Staple operation 2 Staple level detection Stack mode feed and delivery Stapler/stacker delivery jam Stapler/stacker jam detectionStapler/stacker feed jam Stapler/stacker feed stationary jam Image-formation system Image formation block diagram Primary charging Electrostatic latent-image formation Writing the image to the photosensitive drum Writing the image Developing the image Developing the image Transferring the image Transferring the image Fusing the image Q2431-90912 Theory of operation Print cartridge memory chip Print cartridge memory chip Formatter system PowerSaveResolution Enhancement technology Input/output EconoMode Printer memory Control panel PJL overview Removing and replacing parts Page Required tools Removal and replacement strategyBefore performing service After completing service Phillips screw with self-tapping threads Screws used in the printerScrew measurement guide Phillips machine screw with captive star washer Parts-removal tree Access to the transfer assembly and to the registration Location of printer, input trays, and cabinet wheel locks Printer input tray, and cabinet wheel locks Print cartridge 1 User-replaceable partsPrint cartridge Open the control-panel door and tray Transfer roller Tray 1 pickup roller 1 Tray 1 pickup roller Tray 1 separation pad Tray 1 separation pad Tray 2 feed rollers 2 Tray 2 feed rollers Tray 2 feed rollers 3 Covers, tray 1, and the rear output bin Accessory covers and the tray 2 extension door Accessory covers 3 Formatter cover Top cover 1 Top cover Top cover 4 Top cover 3 Top cover 5 Right-side cover 1 Right-side cover Right-side cover 3 Left-side cover 1 Left-side cover Slide 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 1 Rear output bin Control-panel overlay Control-panel display Control-panel assembly 1 Control-panel assembly Control-panel assembly 2 Control-panel assembly 4 Firmware Dimm Internal componentsFirmware Dimm Formatter assembly Formatter assembly Fuser Output delivery assembly rear view, formatter side 1 Output delivery assembly Output delivery assembly 2 Duplexing pendulum assembly 1 o Duplexing pendulum assembly Duplexing pendulum assembly 2 Tray 2 media-size sensor 1 Tray 2 media-size sensor Main cooling fan 1 Main cooling fan left side Main cooling fan 3 Cooling fan HP LaserJet 4300 series only 1 Cooling fan right side HP LaserJet 4300 series printer only Cooling fan HP LaserJet 4300 series only 3 Cooling fan HP LaserJet 4300 series only 5 Laser/scanner 1 Laser/scanner 4 Laser/scanner 3 Print-cartridge motor HP LaserJet 4300 series only 1 Print-cartridge motor HP LaserJet 4300 series printer only Print-cartridge motor HP Laserjet 4300 series only 1 Remove it Main motorMain motor 1 Main motor 3 Tray 2 lifter-drive assembly 1 Tray 2 lifter-drive assembly Tray 2 lifter-drive assembly 2 DC controller PCA 1 DC controller PCA 2 Paper-pickup assembly 1 Paper-pickup assembly Paper-pickup assembly 3 Paper-pickup assembly 5 Main drive assembly 1 Main drive assembly Main drive assembly 2 Power supply right side 1 Power supply 2 Power supply tray 2 cavity 4 Paper-feed belt assembly 1 Paper-feed belt assembly Tray 1 pickup assembly 1 Tray 1 paper-pickup assembly Tray 1 pickup assembly 2 Tray 1 pickup assembly 4 Paper feed assembly 1 Paper feed assembly Paper-feed assembly 2 Reinstall note Hint Registration assembly 1 Registration assembly Registration assembly 3 Transfer assembly 1 Transfer assembly Transfer assembly left rear view 2 Transfer assembly 3 Transfer assembly 5 Sheet feeder right-side cover AccessoriesSheet feeder assembly Sheet feed rollers Sheet feeder right-side cover 2 Sheet feeder right-side cover 4 Sheet feeder control PCA Sheet feeder control PCA Sheet feeder media-size sensor 1 Sheet feeder media-size sensor Sheet feeder lifter-drive assembly 1 Sheet feeder lifter-drive assembly Sheet feeder paper-pickup drive assembly 1 Sheet feeder paper-pickup drive assembly Sheet feeder paper-pickup drive assembly 3 Sheet feeder paper-pickup drive assembly 5 Sheet feeder paper-pickup drive assembly 7 Sheet feeder separation roller Sheet feeder feed rollers 500-sheet feeder door 1 Sheet feeder door Sheet feeder door 3 500-sheet feeder rear cover 1 Sheet feeder rear cover 500-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 1 Troubleshooting flowchart Troubleshooting flowchart 2 Overview Power-on checks Power-on defect or blank display Problem Action Power-on defect or blank display Information pages Troubleshooting tools Sample menu map Menu map Configuration Configuration Supplies status Supplies status Embedded Web server Gaining access to the embedded Web server Networking tab Settings tabInformation tab Other links Printer Status and Alerts software To view status messages and information To select status messages Information see System Setup submenu on Using control-panel menusResets submenu Resets submenu Values Explanation Diagnostics menu Values Explanation Diagnostics menu For the HP LaserJet 4300 product Service menu service PIN codes Converting the Service ID to an actual date Service IDRestoring the Service ID Nvram initialization Printer resets and power-on modesCold reset To perform a cold reset Skip disk load Power-on bypassHard-disk initialization To initialize the hard disk Self test Formatter test Test pagesEngine test Computer direct connect parallel test Interface troubleshootingEIO troubleshooting Communications checks Jetdirect Jetdirect Status messages Display-message troubleshootingError messages Critical-error messages See 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 Firmware Dimm on Dimm on 336 , 500 -sheet feeder See Configuration page onSwitches and sensors on See Power supply on See Fuser on Configuration page onFuser on Size detection on Stacker or stapler/stacker LED Blinks in amberOn page 241 to see if Sheet feeder media Printer 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 Only Error applies to the stapler/stackerAmber this error applies to Stapler/stacker LED is On 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 Sheet feeder switches Install the paper-feedAssembly sensor flag on See Printer switches Location of printer switches Printer switchesCorrectly install Paper-feed assembly sensor 336 and Fuser on See Location of printer Removing and replacing JAM in Output Device Tray 2 feed rollers on Functions to OFF Description Drivers and Software . Check Replace the Dimm or ZZ Error Number Scanner assembly on Formatter assembly on Main fan error F1 Cartridge fan error F2 Sensor. See Main cooling Air temperature sensorPower supply DC controller LJ 4300 only 59.00, 59.10, 59.20 MotorOr 59.4 EP Motor failure On page 209 or 1,500-sheet Assembly. See Tray 2 lifterFeeder lifter-drive assembly Print-cartridge motor Is off 60.4 Stapler unit on Settings and defaults onIs continuously illuminated Amber Initialize the hard disk on Initialize Nvram on Critical hardware error has Turn the printer off and then Jam locations Paper-path troubleshooting To disable the paper-jam recovery Paper-jam recovery Avoiding paper jams Common causes of paper jams Cause Solution Data collection Basic troubleshooting for persistent jamsPersistent jams Paper-path checklist General paper-path troubleshooting To perform a paper- test Paper-path test Drive assembly on page 179 and/or Printer Causes of tray 1 jams SolutionCauses of tray 2 jams Solution Tray 1 paper-pickup assembly on Jams in tray 3 and/or tray Causes of tray 3 and or tray 4 jams Solution Jams in the paper path Causes of paper-path jams SolutionCauses of duplex path jams Solution Drive assembly on Multiple pages feed Media transport problemsCauses for multiple pages feeding Solution Cause Solution Paper is skewed Causes for skewed paper SolutionRegistration assembly on Print quality problems associated with media Image-formation troubleshooting Overhead transparency defects Print quality problems associated with the environmentPrint quality problems associated with jams Image quality Does the problem repeat on the page?HP paper specification Image defects EconoMode Check the print cartridge Drum rotation functional check Half self-test functional check Print quality image defects Image defect tables Print quality image defects Light print entire Possible cause Recommended action Light print partial Possible cause Recommended actions Dots in the paper path direction Specks or dots Possible cause Recommended action Wrong fuser setting for media type Might cause problems if the paper isHave this problem because they are not Cartridge Wrong toner density setting Horizontal lines opposite the paper path direction Grey background Possible cause Recommended actions Distorted images Repeating defects and repeating images Creases Possible cause Recommended actions Skew Possible cause Recommended actionsCurl or wave Possible cause Recommended actions White lines opposite the paper path Blurred print Possible cause Recommended actions Line detail setting is turned offWhite spots on black Possible cause Recommended actions Scattered lines Possible cause Recommended actions Black Replace the laser/scanner assembly. See Laser/scanner Blank or white Possible cause Recommended actions Dark print Repetitive defect ruler Repetitive defects troubleshooting Initial checks Troubleshooting the stacker and the stapler/stacker Delivery area Printer connection area Jam errorsStacker and stapler/stacker paper path Stacker paper path test Damaged Stapler/stacker paper path test Q2431-90912 Troubleshooting Paper transport error troubleshooting Paper transport errorsMalfunction errors Component errors Main printer parts Printer component locations Location of main printer parts 2 Location of main printer parts 3 Location of main printer parts 4 Location of printer switches and sensors Printer switches and sensors Location of printer motors and fans Printer motors and fans Location of printer PCAs Printer PCAs Sheet feeder main parts Accessory component locations Sheet 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 Location of the stapler/stacker stapler unit Stapler/stacker stapler assembly Stacker and stapler/stacker switches and sensors Stacker and stapler/stacker motors and solenoids Location of the stacker and stapler/stacker PCAs Stacker and stapler/stacker PCAs HP LaserJet 4200 wiring diagram Printer and accessory wiring diagrams HP 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 top DC controller block diagram HP LaserJet 4200 general timing diagram General timing diagrams HP LaserJet 4300 general timing diagram Stapler/stacker timing diagram Troubleshooting Q2431-90912 Parts and diagrams Ordering information Ordering parts, supplies, and getting support HP-authorized resellers and support Accessories and supplies Cables and interfaces Part number Exchange number Memory, fonts, and mass storage Part number Exchange number Part number Exchange number Printer maintenance kit Documentation Part number Description or use How to use the parts lists and diagrams External covers and panels Parts diagrams and lists External 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 Part number Description Reference Transfer assembly Fuser 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 Part number Description Reference Sheet tray Q2431-90912 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 pars list Part number Description Reference Alphabetical parts list Alphabetical pars list Part number Description Reference Paper size sensing assembly outside, 1,500-sheet feeder Alphabetical pars list Part number Description Reference Numerical pars list Part number Description Reference Numerical parts list Numerical 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