HP Compaq dx2420 Service & Reference Manual Download Page 78

Page: 78 / 96

24-Pin Power

Connector

Front

Pin

Signal

Pin

Signal

Pin

Signal

+3.3V

GND

+5V

GND

+5V

GND

POK

+5 Vaux

+12V

+3.3V

–12V

GND

PSON

GND

open

+5V

GND

4-Pin Power (for CPU)

Connector and Icon

Pin

Signal

GND

+12V CPU

-12V CPU

SATA Data and Power

Drive Connector

Pin

Signal

Pin

Signal

Pin

Signal

Pin

Signal

Ground

B-

A+

B+

A-

Ground

Appendix A Connector Pin Assignments

Summary of Contents for Compaq dx2420

Page 1: ...Service Reference Guide HP Compaq dx2420 Business PC ...

Page 2: ...companying such products and services Nothing herein should be construed as constituting an additional warranty HP shall not be liable for technical or editorial errors or omissions contained herein This document contains proprietary information that is protected by copyright No part of this document may be photocopied reproduced or translated to another language without the prior written consent ...

Page 3: ...mputer Setup Advanced 5 Computer Setup Power 7 Computer Setup Boot 8 Computer Setup Exit 8 Recovering the Configuration Settings 9 3 Computer Diagnostic Features HP Insight Diagnostics 10 Accessing HP Insight Diagnostics 10 Survey Tab 11 Test Tab 12 Status Tab 12 Log Tab 13 Help Tab 13 Saving and Printing Information in HP Insight Diagnostics 14 Downloading the Latest Version of HP Insight Diagnos...

Page 4: ...uidelines 22 Routine Care 23 General Cleaning Safety Precautions 23 Cleaning the Computer Case 23 Cleaning the Keyboard 23 Cleaning the Monitor 24 Cleaning the Mouse 24 Service Considerations 24 Power Supply Fan 24 Tools and Software Requirements 24 Screws 25 Cables and Connectors 25 Hard Drives 25 Lithium Coin Cell Battery 26 6 Removal and Replacement Procedures Microtower MT Chassis Serial Numbe...

Page 5: ...itch LED Assembly 59 Heat sink 60 Processor 61 Rear Chassis Fan 62 Power Supply 63 System Board 64 Battery 65 Type 1 Battery Holder 66 Type 2 Battery Holder 66 Type 3 Battery Holder 67 Appendix A Connector Pin Assignments Keyboard 68 Mouse 68 Ethernet RJ 45 69 Parallel Interface 69 Serial Interface Powered and Non Powered 70 USB 70 Microphone 70 Headphone 70 Line in Audio 71 Line out Audio 71 Moni...

Page 6: ...dix C Troubleshooting Safety and Comfort 78 Before You Call for Technical Support 78 Helpful Hints 79 Solving General Problems 80 Solving Hardware Installation Problems 83 Interpreting POST Audible Codes 85 Contacting Customer Support 86 Appendix D Specifications Index 89 vi ...

Page 7: ...e instructions on the screen to complete the installation CAUTION Once the automatic installation has begun DO NOT TURN OFF THE COMPUTER UNTIL THE PROCESS IS COMPLETE Turning off the computer during the installation process may damage the software that runs the computer or prevent its proper installation NOTE If the computer shipped with more than one operating system language on the hard drive th...

Page 8: ... of the devices If prompted for the i386 directory replace the path specification with C i386 or use the Browse button in the dialog box to locate the i386 folder This action points the operating system to the appropriate drivers Obtain the latest support software including support software for the operating system from http www hp com support Select your country and language select Download drive...

Page 9: ...up F10 Utility and the settings described in this section Enable or disable removable media boot ability Using Computer Setup F10 Utilities Computer Setup can be accessed only by turning the computer on or restarting the system To access the Computer Setup Utilities menu complete the following steps 1 Turn on or restart the computer 2 As soon as the computer is turned on press F10 when the monitor...

Page 10: ...CMOS could become corrupted It is safe to turn off the computer only after exiting the F10 Setup screen Computer Setup Main NOTE Support for specific Computer Setup options may vary depending on the hardware configuration Table 2 1 Computer Setup Main Option Description System Time Allows you to set system time System Date Allows you to set system date Language Allows you to select language Floppy...

Page 11: ...oduct Number Asset Tag press Enter to change NOTE The model number is programmed by an external utility for the following models HP Compaq dx2390 Microtower HP Compaq dx2400 Microtower HP Compaq dx2420 Microtower Computer Setup Advanced NOTE Support for specific Computer Setup options may vary depending on the hardware configuration WARNING Setting items on this menu to incorrect values may cause ...

Page 12: ...port Allows you to set Disabled Enabled Onboard LAN Allows you to disable enable onboard LAN controller Onboard LAN Boot ROM Allows you to disable enable the boot ROM of the onboard LAN chip SATA1 Controller Allows you to disable enable the SATA1 Controller SATA1 Controller Mode If SATA1 Controller is enabled allows you to set the mode to IDE AHCI SATA2 Controller Allows you to disable enable the ...

Page 13: ...rt for specific Computer Setup options may vary depending on the hardware configuration Table 2 3 Computer Setup Power Option Description After AC Power Failure Allows you to select system restart behavior after power loss Stay Off Power On Auto XD Disables enables XD bit Table 2 2 Computer Setup Advanced continued Computer Setup F10 Utilities 7 ...

Page 14: ... CD DVD drives Hard Drive Group Boot Priority Specifies boot device priority within hard drives Network Group Boot Priority Specifies boot device priority within bootable network devices ESC Boot Menu Disables enables the Esc key boot menu during POST F9 Diagnostics Disables enables the F9 key diagnostics function during POST F10 Setup Disables enables the F10 key computer setup function during PO...

Page 15: ...o reset all BIOS Setup options to their default values including options for Ctrl F10 you must enter F10 Setup mode and press F5 This does not include updates to system date system time supervisor password user password and CPU frequency multiplier Table 2 5 Computer Setup Exit continued Recovering the Configuration Settings 9 ...

Page 16: ...ed after installing or connecting a new device You should run tests save the test results and print them so that you have printed reports available before placing a call to the Customer Support Center NOTE Third party devices may not be detected by HP Insight Diagnostics Accessing HP Insight Diagnostics To access HP Insight Diagnostics you must create a Recovery Disc Set then boot to the CD contai...

Page 17: ...ng categories of information to display All Gives a listing of all categories of information about the computer Overview Gives you a listing of general information about the computer Architecture Provides system BIOS and PCI device information Asset Control Shows product name asset tag system serial number and processor information Communication Shows information about the computer parallel LPT an...

Page 18: ...u want to run Quick Complete or Custom 3 Select the Test Mode Interactive or Unattended 4 Choose how you want the test to be executed either Number of Loops or Total Test Time When choosing to run the test over a specified number of loops enter the number of loops to perform If you desire to have the diagnostic test for a specified time period enter the amount of time in minutes 5 If performing a ...

Page 19: ...displays the device tested The Test section displays the type of test run The Description section describes the error that the diagnostic test found The Recommended Repair will give a recommended action that should be performed to resolve the failed hardware The Failed Count is the number of times the device has failed a test The Error Code provides a numerical code for the failure The error codes...

Page 20: ...een written to the media 5 Print the information from the storage device used to save it NOTE To exit HP Insight Diagnostics click Exit Diagnostics button in the bottom left corner of the screen then remove the CD from the optical drive Downloading the Latest Version of HP Insight Diagnostics 1 Go to http www hp com 2 Click the Software Driver Downloads link 3 Enter your product number for example...

Page 21: ...ecovery Disc Set immediately before using the computer and schedule regular automatic Recovery Point backups To create the Recovery Disc Set 1 Click Start HP Backup and Recovery HP Backup and Recovery Manager to open the Backup and Recovery Wizard then click Next 2 Select Create a set of recovery discs Recommended and click Next 3 Follow the instructions in the wizard For more information on using...

Page 22: ...12 V Jumpers for configuring drive N A Data transfer rate 3 0 Gb s SATA connectors on the system board are color coded to make identification easier SATA Identification Color Port Attachment Sequence Primary channel device 0 Dark blue SATA 0 1 Primary channel device 1 Light Blue SATA 2 4 Secondary channel device 0 White SATA 1 2 Secondary channel device 1 Orange SATA 3 3 NOTE If there is an error ...

Page 23: ...ble each cable has 3 grounds and 4 transmit receive pins Pin Number Usage Device Plug Host Plug P1 Ground Ground Ground P2 A Transmit data Receive data P3 A Transmit data Receive data P4 Ground Ground Ground P5 B Receive data Transmit data P6 B Receive data Transmit data P7 Ground Ground Ground P2 and P3 differential signal pair P5 and P6 differential signal pair SATA Power Cable Pin Usage Notes P...

Page 24: ...ystem used in the computer determines the maximum usable size of a drive partition A drive partition is the largest segment of a drive that may be properly accessed by the operating system A single hard drive may therefore be subdivided into a number of unique drive partitions in order to make use of all of its space Because of the differences in the way that drive sizes are calculated the size re...

Page 25: ...cribed in this chapter is essential for proper service CAUTION When the computer is plugged into an AC power source voltage is always applied to the system board You must disconnect the power cord from the power source before opening the computer to prevent system board or component damage Chassis Designation Microtower MT Figure 5 1 Microtower Configuration Chassis Designation 19 ...

Page 26: ...V 400 V 15 000 V 5 000 V 800 V 700 V 35 000 V 12 000 V 6 000 V 2 000 V Removing DIPs from vinyl tray Removing DIPs from Styrofoam Removing bubble pack from PCB Packing PCBs in foam lined box 2 000 V 3 500 V 7 000 V 5 000 V 4 000 V 5 000 V 20 000 V 11 000 V 11 500 V 14 500 V 26 500 V 21 000 V These are then multi packaged inside plastic tubes trays or Styrofoam NOTE 700 volts can degrade a product ...

Page 27: ...0 15 000 Grounding the Work Area To prevent static damage at the work area use the following precautions Cover the work surface with approved static dissipative material Provide a wrist strap connected to the work surface and properly grounded tools and equipment Use static dissipative mats foot straps or air ionizers to give added protection Handle electrostatic sensitive components parts and ass...

Page 28: ...s or air intakes Do not place the keyboard with the keyboard feet down directly against the front of the desktop unit as this also restricts airflow Occasionally clean the air vents on all vented sides of the computer Lint dust and other foreign matter can block the vents and limit the airflow Be sure to unplug the computer before cleaning the air vents Never operate the computer with the cover or...

Page 29: ...ith clear water For stubborn stains use isopropyl rubbing alcohol No rinsing is needed as the alcohol will evaporate quickly and not leave a residue After cleaning always wipe the unit with a clean lint free cloth Occasionally clean the air vents on the computer Lint and other foreign matter can block the vents and limit the airflow Cleaning the Keyboard Follow all safety precautions in General Cl...

Page 30: ...hat the power to the computer is turned off Clean the mouse ball by first removing the retaining plate and the ball from the housing Pull out any debris from the ball socket and wipe the ball with a clean dry cloth before reassembly To clean the mouse body follow the procedures in Cleaning the Computer Case on page 23 Service Considerations Listed below are some of the considerations that you shou...

Page 31: ...ey cannot be caught or snagged by parts being removed or replaced CAUTION When servicing this computer ensure that cables are placed in their proper location during the reassembly process Improper cable placement can damage the computer Hard Drives CAUTION Handle hard drives as delicate precision components avoiding all physical shock and vibration This applies to failed drives as well as replacem...

Page 32: ...d chemical burn if the battery is handled improperly Do not disassemble crush puncture short external contacts dispose in water or fire or expose it to temperatures higher than 140ºF 60ºC Do not attempt to recharge the battery NOTE Batteries battery packs and accumulators should not be disposed of together with the general household waste In order to forward them to recycling or proper disposal pl...

Page 33: ...Diagnostics utility to verify that all components operate properly NOTE Not all features listed in this guide are available on all computers Serial Number Location Each computer has a unique serial number and product ID number that are located on the top cover of the computer Keep these numbers available for use when contacting customer service for assistance Figure 6 1 Serial Number and Product I...

Page 34: ...system board as long as the system is plugged into an active AC outlet In some systems the cooling fan is on even when the computer is in the Standby or Suspend modes The power cord should always be disconnected before servicing a unit 6 Disconnect the power cord from the electrical outlet and then from the computer 7 Disconnect all peripheral device cables from the computer 8 Lay the computer dow...

Page 35: ...devices are used to prevent unauthorized access to the internal components of the computer and or secure the computer to a fixed object Cable Lock Figure 6 2 Installing a Cable Lock Padlock Figure 6 3 Installing a Padlock External Security Devices 29 ...

Page 36: ...looping it around a stationary object Figure 6 4 Securing the Cable to a Fixed Object 2 Thread the keyboard and mouse cables through the lock Figure 6 5 Threading the Keyboard and Mouse Cables 30 Chapter 6 Removal and Replacement Procedures Microtower MT Chassis ...

Page 37: ...ided Figure 6 6 Attaching the Lock to the Chassis 4 Insert the plug end of the security cable into the lock 1 and push the button in 2 to engage the lock Use the key provided to disengage the lock Figure 6 7 Engaging the Lock External Security Devices 31 ...

Page 38: ... 2 Loosen the screw 1 that secures the access panel to the computer chassis 3 Slide the access panel back 2 about 1 3 cm 1 2 inch then lift it off the unit NOTE You may want to lay the computer on its side to install internal parts Be sure the side with the access panel is facing up Figure 6 8 Removing the Computer Access Panel To install the access panel reverse the removal procedure 32 Chapter 6...

Page 39: ...Remove the computer access panel Computer Access Panel on page 32 3 Press outward on the three latches on the right side of the bezel 1 then rotate the right side of the bezel off the chassis 2 followed by the left side To reinstall the front bezel reverse the removal procedure Front Bezel 33 ...

Page 40: ...the bezel blank until it breaks free from the front bezel 1 then discard the bezel blank If the blank needs to be replaced at a later date you can order a replacement blank from HP 3 To remove the 3 5 inch bezel blank press the two retaining tabs towards the outer left edge of the bezel 2 and pull the bezel blank inwards to free it from the front bezel 3 Figure 6 9 Removing a Bezel Blank 4 Replace...

Page 41: ...these cables Do not bend any cable sharply A sharp bend can break the internal wires Never bend a SATA data cable tighter than a 30 mm 1 18 in radius Never crease a SATA data cable Do not rely on components like the drive cage power supply or computer cover to push cables down into the chassis Always position the cables to lay properly by themselves When removing the power supply power cables from...

Page 42: ...n JFP1 black Front power button LED FUSB1 white Front I O USB FUSB2 white Media card reader JAUD1 yellow Front I O audio DIMM1 DIMM2 blue blue Memory slots PCI1 white PCI 2 3 full height slot PCI_E1 black PCI Express X16 slot PCI_E2 black PCI Express X1 slot PCI_E3 black PCI Express X1 slot U1 silver Processor CMOS black with green cap Clear CMOS password header SATA0 SATA1 SATA2 SATA3 dark blue w...

Page 43: ...pliant or PC2 6400 800 MHz compliant 1 8 volt DDR2 SDRAM DIMMs The DDR2 SDRAM DIMMs must also support CAS latency 5 DDR2 667 MHz 5 5 5 timing CAS latency 5 DDR2 800 Mhz 5 5 5 timing and CAS latency 6 DDR2 800 Mhz 6 6 6 timing contain the mandatory JEDEC SPD information In addition the computer supports 512Mbit and 1Gbit non ECC memory technologies single sided and double sided DIMMs DIMMs construc...

Page 44: ...nel mode if the memory capacity of the DIMM in Channel A is equal to the total memory capacity of the DIMM in Channel B The system will operate in flex mode if the memory capacity of the DIMM in Channel A is not equal to the memory capacity of the DIMM in Channel B In flex mode the channel populated with the least amount of memory describes the total amount of memory assigned to dual channel and t...

Page 45: ... on page 28 2 Remove the computer access panel Computer Access Panel on page 32 3 Open both latches of the memory module socket 1 and insert the memory module into the socket 2 NOTE A memory module can be installed in only one way Match the notch on the module with the tab on the memory socket In order to create a dual channel memory configuration the memory capacity of Channel A must equal the me...

Page 46: ...on slot 3 PCI Express x1 expansion slot 4 PCI Express x16 expansion slot NOTE You can install a PCI Express x1 x4 x8 or x16 expansion card in the PCI Express x16 expansion slot To remove replace or add an expansion card 1 Prepare the computer for disassembly Preparation for Disassembly on page 28 2 Remove the computer access panel Computer Access Panel on page 32 3 Locate the correct vacant expans...

Page 47: ... expansion slot cover or the existing expansion card NOTE Before removing an installed expansion card disconnect any cables that may be attached to the expansion card a If you are installing an expansion card in a vacant socket you must use a flat blade screwdriver to pry out the metal shield on the rear panel that covers the expansion slot Be sure to remove the appropriate shield for the expansio...

Page 48: ...d pull the retention arm on the back of the expansion socket away from the card and carefully rock the card back and forth until the connectors pull free from the socket Be sure not to scrape the card against the other components Figure 6 15 Removing a PCI Express x16 Expansion Card 6 Store the removed card in anti static packaging 7 If you are not installing a new expansion card install an expans...

Page 49: ... so that the bottom of the bracket on the card slides into the small slot on the chassis Press the card straight down into the expansion socket on the system board Figure 6 16 Installing an Expansion Card NOTE When installing an expansion card press firmly on the card so that the whole connector seats properly in the expansion card slot 9 Replace the slot cover lock and secure it in place with the...

Page 50: ...light blue SATA3 and orange SATA4 connectors Connect a second SATA optical drive to the orange SATA4 connector Connect additional SATA hard drives to the next available unpopulated SATA connector on the system board in the following order SATA1 SATA2 SATA4 SATA3 Connect a diskette drive to the connector labeled FDD1 Connect a media card reader to the USB connector labeled JUSB2 The system does not...

Page 51: ...rd Do not remove a drive while the computer is on or in standby mode Before handling a drive ensure that you are discharged of static electricity While handling a drive avoid touching the connector Handle a drive carefully do not drop it Do not use excessive force when inserting a drive Avoid exposing a hard drive to liquids temperature extremes or products that have magnetic fields such as monito...

Page 52: ...tem Board Drive Connections Table 6 3 System Board Drive Connections No System Board Connector System Board Label Color 1 Media Card Reader JUSB2 white 2 Diskette Drive FDD1 black 3 SATA1 SATA1 dark blue 4 SATA3 SATA3 light blue 5 SATA2 SATA2 white 6 SATA4 SATA4 orange 46 Chapter 6 Removal and Replacement Procedures Microtower MT Chassis ...

Page 53: ...rnal drive bay for optional drive media card reader shown 3 Primary 3 5 inch internal hard drive bay 4 Secondary 3 5 inch internal hard drive bay for optional hard drive To verify the type and size of the storage devices installed in the computer run Computer Setup Refer to Computer Setup F10 Utility on page 3 for more information Drives 47 ...

Page 54: ...access panel Computer Access Panel on page 32 3 Remove the front bezel Front Bezel on page 33 4 Disconnect the power cable 1 and data cable 2 from the rear of the optical drive Figure 6 21 Disconnecting the Power and Data Cables 5 Remove the two screws that secure the drive to the drive cage 1 then slide the drive out of the front of the chassis 2 Figure 6 22 Removing the Optical Drive 48 Chapter ...

Page 55: ...to break the knockout plate out of the chassis Discard the knockout plate 6 If the new drive has screws installed on the sides of the drive remove the screws before inserting the drive into the chassis 7 Slide the drive in through the front of the chassis 1 until the bezel on the drive is evenly aligned with the computer front bezel and install the two M3 metric retainer screws 2 as shown in the i...

Page 56: ... Removing an External 3 5 inch Drive CAUTION All removable media should be taken out of a drive before removing the drive from the computer NOTE The 3 5 inch drive bay may contain a diskette drive or a media card reader 1 Prepare the computer for disassembly Preparation for Disassembly on page 28 2 Remove the computer access panel Computer Access Panel on page 32 3 Remove the front bezel Front Bez...

Page 57: ...em board Figure 6 25 Disconnecting the Media Card Reader Cable Installing a Drive into the 3 5 inch External Drive Bay The 3 5 inch external drive bay on the front of the computer can be configured with a media card reader or a diskette drive 1 Prepare the computer for disassembly Preparation for Disassembly on page 28 2 Remove the computer access panel Computer Access Panel on page 32 3 Remove th...

Page 58: ...ric retainer screws 2 as shown in the illustration below NOTE Extra drive retainer screws are provided on the interior of the front bezel if needed The M3 metric retainer screws for diskette drives or media card readers are black Figure 6 26 Installing a 3 5 inch Device Media Card Reader Shown 8 Connect the appropriate drive cables a If installing a diskette drive connect the power and data cables...

Page 59: ...et to restore the operating system software drivers and any software applications that were preinstalled on the computer If you do not have this CD set select Start HP Backup and Recovery and create it now 1 Prepare the computer for disassembly Preparation for Disassembly on page 28 2 Remove the computer access panel Computer Access Panel on page 32 3 Remove the two screws that secure the hard dis...

Page 60: ...e hard disk drive cage away from the bottom of the chassis 2 as shown below Figure 6 28 Releasing the Hard Drive Cage 5 Lift the hard disk drive cage out of the chassis Figure 6 29 Removing the Hard Drive Cage 54 Chapter 6 Removal and Replacement Procedures Microtower MT Chassis ...

Page 61: ...t secure the hard disk drive to the hard disk drive cage 1 then slide the hard disk drive out of the hard disk drive cage 2 Figure 6 31 Removing the Hard Drive Installing an Internal 3 5 inch Hard Drive 1 Follow the steps in Removing an Internal 3 5 inch Hard Drive on page 53 to remove the hard drive cage and if necessary the existing hard drive Drives 55 ...

Page 62: ...e old drive to install the new drive NOTE If you are installing a second hard drive use four of the extra standard 6 32 screws that are installed on the interior of the front bezel The 6 32 screws are silver Figure 6 32 Installing the Hard Drive in the Drive Cage 3 Connect the power cable 1 and data cable 2 to the back of the hard drive Figure 6 33 Connecting the Hard Drive Cables CAUTION Never cr...

Page 63: ...d of the data cable to the appropriate system board connector NOTE If your system has only one SATA hard drive you must connect the hard drive data cable to the dark blue connector labeled SATA1 to avoid any hard drive performance problems If you are adding a second hard drive connect the data cable to the next available unpopulated SATA connector on the system board in the following order SATA1 S...

Page 64: ...zel Front Bezel on page 33 4 Disconnect the front USB cable from the yellow system board connector JAUD1 and the I O cable from the white system board connector FUSB1 5 Stand the unit upright 6 Remove the silver T15 screw 1 that secures the panel to the chassis 7 Slide the panel assembly upward 2 and then pull the assembly away from the unit while threading the wires through the hole in the front ...

Page 65: ...e the cable 7 To remove the power button assembly perform the following steps simultaneously a On the right side of the assembly press down on the top tab 1 b Press in on the tab on the right side of the assembly 2 c While pressing the two tabs pull the assembly away from the chassis enough to loosen the tabs from their slots in the chassis Figure 6 37 Removing the power switch LED assembly 8 Pull...

Page 66: ... CAUTION Heat sink retaining screws should be removed in diagonally opposite pairs as in an X to even the downward forces on the processor This is especially important as the pins on the socket are very fragile and any damage to them may require replacing the system board 5 Remove the heat sink from the processor When reinstalling the heat sink make sure that its bottom has been cleaned with an al...

Page 67: ... cause irreparable damage Once pins are damaged it may be necessary to replace the system board The heat sink must be installed within 24 hours of installing the processor to prevent damage to the processor s solder connections Figure 6 39 Removing the processor To install a new processor 1 Place the processor in its socket and close the retainer 2 Secure the locking lever If reusing the existing ...

Page 68: ...ystem board always update the system ROM to ensure that the latest version of the BIOS is being used on the computer The latest system BIOS can be found on the Web at http h18000 www1 hp com support files Rear Chassis Fan 1 Prepare the computer for disassembly Preparation for Disassembly on page 28 2 Remove the computer access panel Computer Access Panel on page 32 3 Disconnect the fan control cab...

Page 69: ...ove the four silver T15 screws that connect the power supply to the chassis Figure 6 41 Removing the power supply screws 5 While pressing the tab in front of the power supply that holds it in place pull the power supply up slightly to loosen it from the chassis Figure 6 42 Removing the power supply 6 Rotate the power supply slightly toward the left and front of the unit and then lift the power sup...

Page 70: ... page 60 6 Remove the remaining six screws that secure the system board to the chassis Figure 6 43 Removing the system board 7 Slide the system board toward the front of the computer to disengage the I O panel from the rear of the chassis 8 Lift the system board out of the computer When reinstalling the system board first insert the I O panel back into the slots in the rear of the chassis and then...

Page 71: ...ty on page 3 for information on backing up the CMOS settings Static electricity can damage the electronic components of the computer or optional equipment Before beginning these procedures ensure that you are discharged of static electricity by briefly touching a grounded metal object NOTE The lifetime of the lithium battery can be extended by plugging the computer into a live AC wall socket The l...

Page 72: ...ps using Computer Setup Refer to Computer Setup F10 Utility on page 3 Type 2 Battery Holder 1 To release the battery from its holder squeeze the metal clamp 1 that extends above one edge of the battery When the battery pops up lift it out 2 To insert the new battery slide one edge of the replacement battery under the holder s lip with the positive side up 2 Push the other edge down until the clamp...

Page 73: ...back on the clip 1 that holds the battery in place then remove the battery 2 2 Insert the new battery and position the clip back in place Figure 6 46 Removing the battery Type 3 holder 3 Replace the computer access panel 4 Plug in the computer and turn on power to the computer 5 Reset the date and time and any special system setups using Computer Setup Refer to Computer Setup F10 Utility on page 3...

Page 74: ...tion connectors Some of these connectors may not be used on the product being serviced Keyboard Connector and Icon Pin Signal 1 2 3 Data Unused Ground 4 5 6 5 VDC Clock Unused Mouse Connector and Icon Pin Signal 1 2 3 Data Unused Ground 4 5 6 5 VDC Clock Unused 68 Appendix A Connector Pin Assignments ...

Page 75: ...Unused Unused Parallel Interface Connector and Icon Pin Signal Pin Signal 1 2 3 4 Strobe Data Bit 0 Data Bit 1 Data Bit 2 10 11 12 13 Acknowledge Busy Paper End Select 5 6 7 8 Data Bit 3 Data Bit 4 Data Bit 5 Data Bit 6 14 15 16 17 Auto Linefeed Error Initialize Printer Select IN 9 Data Bit 7 18 25 Signal Ground Ethernet RJ 45 69 ...

Page 76: ...9 Request to Send Clear to Send Ring Indicator 5V if powered USB Connector and Icon Pin Signal 1 2 3 4 5 VDC Data Data Ground Microphone Connector and Icon 1 8 miniphone Pin Signal 1 2 3 1 Tip 2 Ring 3 Shield Audio_left Power_Right Audio_right Headphone Connector and Icon 1 8 miniphone Pin Signal 1 2 3 1 Tip 2 Ring 3 Shield Audio_left Power_Right Ground 70 Appendix A Connector Pin Assignments ...

Page 77: ...n 1 8 miniphone Pin Signal 1 2 3 1 Tip 2 Ring 3 Shield Audio_Out_Left Audio_Out_Right Ground Monitor Connector and Icon Pin Signal Pin Signal 1 2 3 4 Red Analog Green Analog Blue Analog Not used 9 10 11 12 5V fused Ground Not used DDC Serial Data 5 6 7 8 Ground Ground Ground Ground 13 14 15 Horizontal Sync Vertical Sync DDC Serial Clock Line in Audio 71 ...

Page 78: ...x 12V 12V 3 3V 13 14 15 16 17 18 3 3V 12V GND PSON GND GND 19 20 21 22 23 24 GND open 5V 5V 5V GND 4 Pin Power for CPU Connector and Icon Pin Signal 1 2 3 4 GND GND 12V CPU 12V CPU SATA Data and Power Drive Connector Pin Signal Pin Signal Pin Signal Pin Signal S1 S5 Ground B S2 S6 A B S3 S7 A Ground S4 Ground 72 Appendix A Connector Pin Assignments ...

Page 79: ...2 13 14 15 PERST GND REFCLK REFCLK GND 16 17 18 19 20 PERp0 PERn0 GND RSVD GND 21 22 23 24 25 PERp1 PERn1 GND GND PERp2 26 27 28 29 30 PERn 2 GND GND PERp3 PERn3 31 32 33 34 35 GND RSVD RSVD GND PERp4 36 37 38 39 40 PERn4 GND GND PERp5 PERn5 41 42 43 44 45 GND GND PERp6 PERn6 GND 46 47 48 49 50 GND PERp7 PERn7 GND RSVD 51 52 53 54 55 GND PERp8 PERN8 GND GND 56 57 58 59 60 PERp9 PERn9 GND GND PERp1...

Page 80: ...11 12 13 14 15 WAKE RSVD GND PETp0 PETn0 16 17 18 19 20 GND GND GND PETp1 PETn1 21 22 23 24 25 GND GND PETp2 PETn2 GND 26 27 28 29 30 GND PETp3 PETn3 GND RSVD 31 32 33 34 35 PRSNT2 GND PETp4 PETn4 GND 36 37 38 39 40 GND PETp5 PETn5 GND GND 41 42 43 44 45 PETp6 PRTn6 GND GND PETp7 46 47 48 49 50 PETn7 GND PRSNT2 GND PETp8 51 52 53 54 55 PETn8 GND GND PETp9 PETn9 56 57 58 59 60 GND GND PETp10 PETn10...

Page 81: ...3 14 15 16 17 18 REFCLK UIM_RESET GND UIM_VPP Reserved UIM_C8 GND 19 20 21 22 23 24 Reserved UIM_C4 W_DISABLE GND PERST PERn0 3 3Vaux 25 26 27 28 29 30 PERp0 GND GND 1 5V GND SMB_CLK 31 32 33 34 36 36 PETn0 SMB_DATA PETp0 GND GND USB_D 37 38 39 40 41 42 Reserved USB_D Reserved GND Reserved LED_WWAN 43 44 45 46 47 48 Reserved LED_WLAN Reserved LED_WPAN Reserved 1 5V 49 50 51 52 Reserved GND Reserve...

Page 82: ...ncy responsible for evaluation in the country where the power cord set will be installed 2 The power cord set must have a minimum current capacity of 10A 7A Japan only and a nominal voltage rating of 125 or 250 volts AC as required by each country s power system 3 The diameter of the wire must be a minimum of 0 75 mm2 or 18AWG and the length of the cord must be between 1 8 m 6 feet and 3 6 m 12 fe...

Page 83: ...d set fittings appliance coupler and wall plug must bear the certification mark of the agency responsible for evaluation in the country where it will be used 2 The flexible cord must be Type SVT or equivalent No 18 AWG 3 conductor The wall plug must be a two pole grounding type with a NEMA 5 15P 15A 125V or NEMA 6 15P 15A 250V configuration 3 Appliance coupler flexible cord and wall plug must bear...

Page 84: ...en for a series of beeps from the computer The beeps are error codes that will help you diagnose the problem Refer to Interpreting POST Audible Codes on page 85 to interpret the codes If the screen is blank plug the monitor into a different video port on the computer if one is available Or change out the monitor with a monitor that you know is functioning properly If you are working on a network p...

Page 85: ... and monitor are plugged into a working electrical outlet Check to see that the voltage select switch some models is set to the appropriate voltage for your region 115V or 230V Check to see that the computer is turned on and the power light is on Check to see that the monitor is turned on and the green monitor light is on Turn up the brightness and contrast controls of the monitor if the monitor i...

Page 86: ...rvice provider Computer will not turn on Cause Solution Cables to the external power source are unplugged Ensure that cables connecting the computer to the external power source are plugged in properly and the wall outlet is active Voltage selector switch on rear of computer chassis some models not switched to correct line voltage 115V or 230V Select the proper AC voltage using the selector switch...

Page 87: ... battery or contact an authorized dealer or reseller for RTC battery replacement Cursor will not move using the arrow keys on the keypad Cause Solution The Num Lock key may be on Press the Num Lock key The Num Lock light should not be on if you want to use the arrow keys The Num Lock key can be disabled or enabled in Computer Setup Poor performance is experienced Cause Solution Processor is hot 1 ...

Page 88: ...ion Cause unknown Restart the computer Blank screen no video Cause Solution Monitor is not turned on and the monitor light is not on Turn on the monitor and check that the monitor light is on The cable connections are not correct Check the cable connection from the monitor to the computer and to the electrical outlet You may have a screen blanking utility installed or energy saver features are ena...

Page 89: ... power Power off the computer and remove the power cord before proceeding A new device is not recognized as part of the system Cause Solution Device is not seated or connected properly Ensure that the device is properly and securely connected and that pins in the connector are not bent down Cable s of new external device are loose or power cables are unplugged Ensure that all cables are properly a...

Page 90: ...w the documentation that came with the system to determine if you are using the correct memory modules and to verify the proper installation 2 Listen for beeps from the computer See Interpreting POST Audible Codes on page 85 to determine possible causes 3 If you still cannot resolve the issue contact Customer Support 84 Appendix C Troubleshooting ...

Page 91: ...the system board 3 short beeps and 1 long beep followed by a three second pause CPU configuration error or invalid CPU detected before graphics card initialized 1 Upgrade the BIOS to proper version 2 Change the processor 1 short beep followed by a one second pause No legacy floppy drive or optical drive found 1 Check cable connections 2 Run the Computer Setup utility and ensure the device port is ...

Page 92: ...ou visit http www hp com NOTE If you take the computer to an authorized reseller dealer or service provider for service remember to provide the setup and power on passwords if they are set Refer to the number listed in the warranty or in the Support Telephone Numbers guide for technical assistance 86 Appendix C Troubleshooting ...

Page 93: ...ressurized Operating Nonoperating 10 000 ft 30 000 ft 3048 m 9144 m NOTE Operating temperature is derated 1 0 C per 300 m 1000 ft to 3000 m 10 000 ft above sea level no direct sustained sunlight Maximum rate of change is 10 C Hr The upper limit may be limited by the type and number of options installed Heat Dissipation Maximum Typical idle 1575 BTU hr 307 BTU hr 397 kg cal hr 77 kg cal hr Power Su...

Page 94: ... supply The power factor correction is present in the 230V operating mode only This allows the system to pass the CE mark requirements for use in the countries of the European Union This supply requires the use of an input voltage range select switch Table D 1 Specifications continued 88 Appendix D Specifications ...

Page 95: ... 20 ethernet RJ 45 pin assignments 69 expansion card sockets 40 expansion slot cover removing 41 replacing 43 external security 29 F fan power supply 24 front bezel removal and replacement 33 removing blanks 34 front USB panel removal and replacement 58 G grounding methods 21 H hard drive installing 55 proper handling 25 removing 53 SATA characteristics 16 headphone pin assignments 70 heat sink re...

Page 96: ...blanks 34 diskette drive 50 expansion slot cover 41 hard drive 53 media card reader 50 optical drive 48 PCI card 42 PCI Express card 42 S safety precautions cleaning 23 SATA connectors on system board 16 data cable pinouts 17 hard drive characteristics 16 pin assignments 72 power cable pinouts 17 screws correct size 25 security cable lock 29 HP Business PC Security Lock 30 padlock 29 serial interf...

Search results

Summary of Contents for Compaq dx2420

Reviews:

Related manuals for Compaq dx2420

Brands by name

Popular brands

HP Compaq dx2420, Service & Reference Manual

Search results

Summary of Contents for Compaq dx2420

Reviews:

Related manuals for Compaq dx2420

Brands by name

Popular brands