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HP dx2420 - Microtower PC Service & Reference Manual
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HP dx2420 - Microtower PC Service & Reference Manual

HP dx2420 - Microtower PC Service & Reference Manual

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Service Reference Guide
HP Compaq dx2420 Business PC

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Summary of Contents for HP dx2420 - Microtower PC

  • Page 1 Service Reference Guide HP Compaq dx2420 Business PC...
  • Page 2 © Copyright 2009 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice. Microsoft and Windows are trademarks of Microsoft Corporation in the U.S. and other countries. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services.

  • Page 3: Table Of Contents

    Table of contents 1 Installing and Customizing the Software Installing and Customizing the Software ....................1 Installing the Operating System ................... 1 Downloading Microsoft Windows Updates ................1 Installing or Upgrading Device Drivers ................2 Customizing the Monitor Display ..................2 2 Computer Setup (F10) Utility Computer Setup (F10) Utilities ......................
  • Page 4 SATA Data Cable ......................17 SATA Power Cable ......................17 PATA Device Information ........................18 ATA SMART Drives ..........................18 Hard Drive Capacities ........................18 5 Identifying the Chassis, Routine Care, and Disassembly Preparation Chassis Designation ........................... 19 Microtower (MT) ......................... 19 Electrostatic Discharge Information ....................
  • Page 5 Expansion Cards ..........................40 Drives ..............................44 System Board Drive Connections ..................46 Drive Positions ........................47 Removing an Optical Drive ....................48 Installing an Optical Drive into the 5.25-inch Drive Bay ............. 49 Removing an External 3.5-inch Drive ................50 Installing a Drive into the 3.5-inch External Drive Bay ............
  • Page 6 Japanese Power Cord Requirements ....................76 Country-Specific Requirements ......................77 Appendix 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 ......................

  • Page 7: Installing And Customizing The Software

    Installing and Customizing the Software Installing and Customizing the Software NOTE: If the computer was shipped with Windows Vista loaded, you will be prompted to register the computer with HP Total Care before installing the operating system. You will see a brief movie followed by an online registration form.

  • Page 8: Installing Or Upgrading Device Drivers

    In Windows XP, you will be directed to the Microsoft Windows Update Web site. If you see one or more pop-up windows that ask you to install a program from http://www.microsoft.com, click Yes to install the program. Follow the instructions on the Microsoft Web site to scan for updates and install critical updates and service packs.

  • Page 9: Computer Setup (F10) Utility

    Computer Setup (F10) Utility Computer Setup (F10) Utilities Use Computer Setup (F10) Utility to do the following: ● Change factory default settings. ● Set the system date and time. ● Set, view, change, or verify the system configuration, including settings for graphics, audio, storage, communications, and input devices.

  • Page 10: Computer Setup-Main

    ● Boot ● Exit Use the arrow keys to select the appropriate heading, then press Enter. Use the arrow (up and down) keys to select the option you want, then press Enter. To return to the previous screen, press Esc. CAUTION: Do NOT turn the computer power OFF while the ROM is saving the Computer Setup (F10) changes because the CMOS could become corrupted.

  • Page 11: Computer Setup-Advanced

    Product 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.
  • Page 12 Table 2-2 Computer Setup—Advanced (continued) Cache RAM (view only) Primary Video Adapter Allows you to select the boot display device when more than 2 video options are offered by the system: ● Integrated (Onboard) ● ● PCI-Ex16 ● PCI-Ex1 DVMT Mode Select Allows you to set video memory mode to: ●...

  • Page 13: Computer Setup-Power

    Table 2-2 Computer Setup—Advanced (continued) Supervisor Password Allows you to change supervisor password. User Password Allows you to change the user password. Computer Setup—Power NOTE: Support for specific Computer Setup options may vary depending on the hardware configuration. Table 2-3 Computer Setup—Power Option Description...

  • Page 14: Computer Setup-Boot

    Computer Setup—Boot NOTE: Support for specific Computer Setup options may vary depending on the hardware configuration. Table 2-4 Computer Setup—Boot Option Description Boot-time Diagnostic Disables/enables POST diagnostic messages display. Screen 1st Boot Device Allows you to specify which device groups will boot first, second, third, and fourth or to disable any of the four: 2nd Boot Device ●...

  • Page 15: Recovering The Configuration Settings

    Table 2-5 Computer Setup—Exit (continued) Discard Changes Press Enter to discard changes. Save Changes Press Enter to save changes. Recovering the Configuration Settings To reset all BIOS Setup options to their default values (including options for Ctrl+F10), you must enter F10 Setup mode and press F5.

  • Page 16: Computer Diagnostic Features

    Select Create a set of recovery discs (Recommended) and click Next. Follow the instructions in the wizard to create a Recovery Disc Set. Use Windows Explorer to search the Recovery Disc Set for the CD with the compaq\hpdiags directory. While the computer is on, insert the CD into an optical drive on the computer.

  • Page 17: Survey Tab

    Shut down the operating system and turn off the computer. Turn on the computer. The system will boot to the CD. NOTE: If the system does not boot to the CD in the optical drive, you may need to change the boot order in the Computer Setup (F10) utility so that the system attempts to boot to the optical drive before booting to the hard drive.

  • Page 18: Test Tab

    Test Tab The Test tab allows you to choose various parts of the system to test. You can also choose the type of test and testing mode. There are three types of tests to choose from: ● Quick Test—Provides a predetermined script where a sample of each hardware component is exercised and requires no user intervention in either Unattended or Interactive mode.

  • Page 19: Log Tab

    After testing has completed, the Cancel Testing button is replaced with a Retest button. The Retest button will retest the last set of tests executed. This enables you to re-run the set of tests without having to re-enter the data in the Test tab. The Status tab also shows: ●...

  • Page 20: Saving And Printing Information In Hp Insight Diagnostics

    Saving and Printing Information in HP Insight Diagnostics You can save the information displayed in the HP Insight Diagnostics Survey and Log tabs to a diskette or a USB 2.0 HP Drive Key (64MB or higher). You can not save to the hard drive. The system will automatically create an html file that has the same appearance as the information displayed on the screen.

  • Page 21: Hp Backup And Recovery Manager

    HP Backup and Recovery Manager The HP Backup and Recovery Manager is an easy-to-use, versatile application that allows you to back up and recover the primary hard drive on the PC. The application works within Windows to create backups of Windows, all applications, and all data files. Backups can be scheduled to occur automatically at designated intervals, or they can be initiated manually.

  • Page 22: Serial And Parallel Ata Drive Guidelines And Features

    Serial and Parallel ATA Drive Guidelines and Features NOTE: Serial ATA = SATA Parallel ATA = PATA SATA Hard Drives Serial ATA Hard Drive Characteristics Number of pins/conductors in data cable Number of pins in power cable Maximum data cable length 39.37 in (100 cm) Data interface voltage differential 400-700 mV...

  • Page 23: Sata Hard Drive Cables

    SATA Hard Drive Cables SATA Data Cable Always use an HP approved SATA 3.0 Gb/s cable as it is fully backwards compatible with the SATA 1.5 Gb/s drives. Current HP desktop products ship with SATA 3.0 Gb/s hard drives. SATA data cables are susceptible to damage if overflexed. Never crease a SATA data cable and never bend it tighter than a 30 mm (1.18 in) radius.

  • Page 24: Pata Device Information

    PATA Device Information The USDT model is the only product that supports a PATA optical drive. No PATA drives are supported on any other model. ATA SMART Drives The Self Monitoring Analysis and Recording Technology (SMART) ATA drives for the HP Personal Computers have built-in drive failure prediction that warns the user or network administrator of an impending failure or crash of the hard drive.

  • Page 25: Identifying The Chassis, Routine Care, And Disassembly Preparation

    Identifying the Chassis, Routine Care, and Disassembly Preparation This chapter provides general service information for the computer. Adherence to the procedures and precautions described 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.

  • Page 26: Electrostatic Discharge Information

    Electrostatic Discharge Information A sudden discharge of static electricity from your finger or other conductor can destroy static-sensitive devices or microcircuitry. Often the spark is neither felt nor heard, but damage occurs. An electronic device exposed to electrostatic discharge (ESD) may not appear to be affected at all and can work perfectly throughout a normal cycle.

  • Page 27: Personal Grounding Methods And Equipment

    ● Avoid contact with pins, leads, or circuitry. ● Place reusable electrostatic-sensitive parts from assemblies in protective packaging or conductive foam. Personal Grounding Methods and Equipment Use the following equipment to prevent static electricity damage to equipment: ● Wrist straps are flexible straps with a maximum of one-megohm ± 10% resistance in the ground cords.

  • Page 28: Operating Guidelines

    ● Conductive foam ● Conductive tabletop workstations with ground cord of one-megohm +/- 10% resistance ● Static-dissipative table or floor mats with hard tie to ground ● Field service kits ● Static awareness labels ● Wrist straps and footwear straps providing one-megohm +/- 10% resistance ●...

  • Page 29: Routine Care

    Routine Care General Cleaning Safety Precautions Never use solvents or flammable solutions to clean the computer. Never immerse any parts in water or cleaning solutions; apply any liquids to a clean cloth and then use the cloth on the component. Always unplug the computer when cleaning with liquids or damp cloths.

  • Page 30: Cleaning The Monitor

    CAUTION: If you remove a key, use a specially designed key puller to prevent damage to the keys. This tool is available through many electronic supply outlets. CAUTION: Never remove a wide leveled key (like the space bar) from the keyboard. If these keys are improperly removed or installed, the keyboard may not function properly.

  • Page 31: Screws

    ● Diagnostics software ● HP tamper-resistant T-15 wrench (Smart Cover FailSafe Key, PN 166527-001) or HP tamper- resistant bits (Smart Cover FailSafe Key, PN 166527-002) Screws The screws used in the computer are not interchangeable. They may have standard or metric threads and may be of different lengths.

  • Page 32: Lithium Coin Cell Battery

    Lithium Coin Cell Battery The battery that comes with the computer provides power to the real-time clock and has a minimum lifetime of about three years. See the appropriate removal and replacement chapter for the chassis you are working on in this guide for instructions on the replacement procedures.

  • Page 33: Removal And Replacement Procedures Microtower (Mt) Chassis

    Removal and Replacement Procedures Microtower (MT) Chassis Adherence to the procedures and precautions described in this chapter is essential for proper service. After completing all necessary removal and replacement procedures, run the Diagnostics utility to verify that all components operate properly. NOTE: Not all features listed in this guide are available on all computers.

  • Page 34: Preparation For Disassembly

    Preparation for Disassembly Identifying the Chassis, Routine Care, and Disassembly Preparation on page 19 for initial safety procedures. Remove/disengage any security devices that prohibit opening the computer (External Security Devices on page 29). Close any open software applications. Exit the operating system. Remove any diskette, compact disc, or media card from the computer.

  • Page 35: External Security Devices

    External Security Devices The following security 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...

  • Page 36: Hp Business Pc Security Lock

    HP Business PC Security Lock Fasten the security cable by looping it around a stationary object. Figure 6-4 Securing the Cable to a Fixed Object Thread the keyboard and mouse cables through the lock. Figure 6-5 Threading the Keyboard and Mouse Cables Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis...
  • Page 37 Screw the lock to the chassis using the screw provided. Figure 6-6 Attaching the Lock to the Chassis 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...

  • Page 38: Computer Access Panel

    Computer Access Panel Prepare the computer for disassembly (Preparation for Disassembly on page 28). CAUTION: Before removing the computer access panel, ensure that the computer is turned off and that the power cord is disconnected from the electrical outlet. Loosen the screw (1) that secures the access panel to the computer chassis. Slide the access panel back (2) about 1.3 cm (1/2 inch), then lift it off the unit.

  • Page 39: Front Bezel

    Front Bezel Prepare the computer for disassembly (Preparation for Disassembly on page 28). Remove the computer access panel (Computer Access Panel on page 32). 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.

  • Page 40: Removing Bezel Blanks

    Removing Bezel Blanks On some models, there are bezel blanks covering the 3.5-inch and 5.25-inch external drive bays that need to be removed before installing a drive. To remove a bezel blank: Remove the front bezel. To remove the lower 5.25-inch bezel blank, gently twist and pull on the bezel blank until it breaks free from the front bezel (1), then discard the bezel blank.

  • Page 41: Cable Management

    Cable Management Always follow good cable management practices when working inside the computer. ● Keep cables away from major heat sources like the heat sink. ● Do not jam cables on top of expansion cards or memory modules. Printed circuit cards like these are not designed to take excessive pressure on them.

  • Page 42: Cable Connections

    Cable Connections System board connectors are color-coded to make it easier to find the proper connection. System Board Connections System Board Connector Name Connector Color Description ATX1 white Power supply, 24-pin JPW1 white Power supply, 4-pin FDD1 black Diskette drive CPU_FAN1 white Heat sink fan...

  • Page 43: Memory

    Memory The computer comes with double data rate 2 synchronous dynamic random access memory (DDR2- SDRAM) dual inline memory modules (DIMMs). The memory sockets on the system board can be populated with up to two industry-standard DIMMs. These memory sockets are populated with at least one preinstalled DIMM. To achieve the maximum memory support, you can populate the system board with up to 4 GB of memory configured in a high- performing dual channel mode.
  • Page 44 Figure 6-10 DIMM Socket Locations Table 6-1 DIMM Socket Locations Item Description Socket Color DIMM1 socket, Channel A (populate first) Blue DIMM2 socket, Channel B Blue NOTE: A DIMM must occupy the DIMM1 socket. The system will automatically operate in single channel mode, dual channel mode, or flex mode, depending on how the DIMMs are installed.
  • Page 45 CAUTION: The memory module sockets have gold metal contacts. When upgrading the memory, it is important to use memory modules with gold metal contacts to prevent corrosion and/or oxidation resulting from having incompatible metals in contact with each other. Static electricity can damage the electronic components of the computer or optional cards. Before beginning these procedures, ensure that you are discharged of static electricity by briefly touching a grounded metal object.

  • Page 46: Expansion Cards

    Expansion Cards The computer has one standard PCI expansion slot that can accommodate an expansion card up to 17.46 cm (6.875 inches) in length. The computer also has two PCI Express x1 expansion slots and one PCI Express x16 expansion slot. Figure 6-11 Expansion Slot Locations Table 6-2...
  • Page 47 On the rear of the computer, a slot cover lock secures the expansion card brackets in place. Remove the screw from the slot cover lock then slide the slot cover lock up to remove it from the chassis. Figure 6-12 Opening the Slot Cover Lock Before installing an expansion card, remove the expansion slot cover or the existing expansion card.
  • Page 48 If you are removing a standard PCI card, hold the card at each end and carefully rock it back and forth until the connectors pull free from the socket. Be sure not to scrape the card against the other components. Figure 6-14 Removing a Standard PCI Expansion Card If you are removing a PCI Express x16 card, pull the retention arm on the back of the expansion...
  • Page 49 CAUTION: After removing an expansion card, you must replace it with a new card or expansion slot cover for proper cooling of internal components during operation. To install a new expansion card, hold the card just above the expansion socket on the system board then move the card toward the rear of the chassis so that the bottom of the bracket on the card slides into the small slot on the chassis.

  • Page 50: Drives

    Connect external cables to the installed card, if needed. Connect internal cables to the system board, if needed. Reconfigure the computer, if necessary. Refer to Computer Setup (F10) Utility on page 3 instructions on using Computer Setup. Drives When installing additional drives, follow these guidelines: ●...
  • Page 51 use M3 metric screws. The HP-supplied M3 metric guide screws (1) are black. The HP-supplied 6-32 standard screws (2) are silver. Figure 6-18 Extra Drive Retainer Screws Location CAUTION: To prevent loss of work and damage to the computer or drive: If you are inserting or removing a drive, shut down the operating system properly, turn off the computer, and unplug the power cord.

  • Page 52: System Board Drive Connections

    System Board Drive Connections Refer to the following illustration and table to identify the system board drive connectors. Figure 6-19 System Board Drive Connections Table 6-3 System Board Drive Connections System Board Connector System Board Label Color Media Card Reader JUSB2 white Diskette Drive...

  • Page 53: Drive Positions

    Drive Positions Figure 6-20 Drive Positions Two 5.25-inch external drive bays for optional drives (optical drives shown) One 3.5-inch external drive bay for optional drive (media card reader shown) Primary 3.5-inch internal hard drive bay 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.

  • Page 54: Removing An Optical Drive

    Removing an Optical Drive CAUTION: All removable media should be taken out of a drive before removing the drive from the computer. To remove an optical drive: Prepare the computer for disassembly (Preparation for Disassembly on page 28). Remove the computer access panel (Computer Access Panel on page 32).

  • Page 55: Installing An Optical Drive Into The 5.25-Inch Drive Bay

    Installing an Optical Drive into the 5.25-inch Drive Bay To install an optional 5.25-inch optical drive: Prepare the computer for disassembly (Preparation for Disassembly on page 28). Remove the computer access panel (Computer Access Panel on page 32). Remove the front bezel (Front Bezel on page 33).

  • Page 56: Removing An External 3.5-Inch Drive

    Connect the power cable (1) and data cable (2) to the rear of the optical drive. Replace the front bezel and access panel. Lock any security devices that were disengaged when the access panel was removed. The system automatically recognizes the drive and reconfigures the computer. Removing an External 3.5-inch Drive CAUTION: All removable media should be taken out of a drive before removing the drive from the...

  • Page 57: Installing A Drive Into The 3.5-Inch External Drive Bay

    If you are removing a diskette drive, disconnect the data cable (1) and power cable (2) from the back of the drive. Figure 6-24 Disconnecting the Diskette Drive Cables If you are removing a media card reader, disconnect the USB cable from the system board. Figure 6-25 Disconnecting the Media Card Reader Cable Installing a Drive into the 3.5-inch External Drive Bay...

  • Page 58: Figure

    If you are installing a diskette drive or media card reader in a bay covered by a bezel blank, remove the front bezel then remove the bezel blank. See Removing Bezel Blanks on page 34 for more information. If you are adding a drive to an empty drive bay for the first time, you must remove the knockout plate from the bay.

  • Page 59: Removing An Internal 3.5-Inch Hard Drive

    Removing an Internal 3.5-inch Hard Drive NOTE: Before you remove the old hard drive, be sure to back up the data from the old hard drive so that you can transfer the data to the new hard drive. Also, if you are replacing the primary hard drive, make sure you have created a Recovery Disc Set to restore the operating system, software drivers, and any software applications that were preinstalled on the computer.
  • Page 60 Push down the latch on the side of the hard disk drive cage (1), then slide the hard disk drive cage away from the bottom of the chassis (2) as shown below. Figure 6-28 Releasing the Hard Drive Cage Lift the hard disk drive cage out of the chassis. Figure 6-29 Removing the Hard Drive Cage Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis...

  • Page 61: Installing An Internal 3.5-Inch Hard Drive

    Disconnect the power cable (1) and data cable (2) from the back of the hard drive. Figure 6-30 Disconnecting the Hard Drive Cables Remove the four screws that 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).
  • Page 62 Slide the new drive into the hard disk drive cage (1), aligning the drive with the four screw holes on the cage. Install the four 6-32 standard screws that secure the hard disk drive to the hard disk drive cage (2). Make sure the hard disk drive cables are facing the top of the drive cage. NOTE: If you are replacing an old drive with a new drive, use the four retainer screws from the old drive to install the new drive.
  • Page 63 Place the hard disk drive cage into the chassis (1), then slide it down toward the bottom of the chassis until it locks into place (2). Figure 6-34 Installing the Hard Drive Cage Attach the two screws that secure the hard disk drive cage to the chassis. Figure 6-35 Securing the Hard Drive Cage If installing a new drive, connect the opposite end of the data cable to the appropriate system board...

  • Page 64: Front Usb Panel

    NOTE: If you are replacing the primary hard drive, use the Recovery Disc Set to restore the operating system, software drivers, and any software applications that were preinstalled on the computer. Front USB Panel Prepare the computer for disassembly (Preparation for Disassembly on page 28).

  • Page 65: Power Switch/Led Assembly

    Power Switch/LED Assembly Prepare the computer for disassembly (Preparation for Disassembly on page 28). Remove the computer access panel (Computer Access Panel on page 32). Remove the front bezel (Front Bezel on page 33). Remove the optical drive (Removing an Optical Drive on page 48).

  • Page 66: Heat Sink

    Heat sink WARNING! To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to disconnect the power cord from the wall outlet and allow the internal system components to cool before touching. You will need a screwdriver with a narrow shaft to loosen the heat sink screws. Prepare the computer for disassembly (Preparation for Disassembly on page 28).

  • Page 67: Processor

    Processor Prepare the computer for disassembly (Preparation for Disassembly on page 28). Remove the computer access panel (Computer Access Panel on page 32). Remove the heat sink (Heat sink on page 60). Rotate the locking lever to its full open position (1). Raise and rotate the microprocessor retainer to its fully open position (2).

  • Page 68: Rear Chassis Fan

    If using a new heat sink, remove the protective covering from the bottom of the heat sink and place it in position atop the processor. Secure the heat sink to the system board and system board tray with the four captive screws and attach the heat sink control cable to the system board.

  • Page 69: Power Supply

    Power Supply Prepare the computer for disassembly (Preparation for Disassembly on page 28). Remove the computer access panel (Computer Access Panel on page 32). Disconnect all power cables from the drives and from the system board. Remove the four silver T15 screws that connect the power supply to the chassis. Figure 6-41 Removing the power supply screws While pressing the tab in front of the power supply that holds it in place, pull the power supply up...

  • Page 70: System Board

    To install the power supply, reverse the removal procedure. System Board Prepare the computer for disassembly (Preparation for Disassembly on page 28). Remove the computer access panel (Computer Access Panel on page 32). Remove all expansion boards (Expansion Cards on page 40).

  • Page 71: Battery

    Battery The battery that comes with the computer provides power to the real-time clock. When replacing the battery, use a battery equivalent to the battery originally installed in the computer. The computer comes with a 3-volt lithium coin cell battery. WARNING! The computer contains an internal lithium manganese dioxide battery.

  • Page 72: Type 1 Battery Holder

    Type 1 Battery Holder Lift the battery out of its holder. Figure 6-44 Removing the battery – Type 1 holder Slide the replacement battery into position, positive side up. The battery holder automatically secures the battery in the proper position. Replace the computer access panel.

  • Page 73: Type 3 Battery Holder

    Plug in the computer and turn on power to the computer. Reset the date and time and any special system setups using Computer Setup. Refer to Computer Setup (F10) Utility on page Type 3 Battery Holder Pull back on the clip (1) that holds the battery in place, then remove the battery (2). Insert the new battery and position the clip back in place.

  • Page 74: Appendix A Connector Pin Assignments

    Connector Pin Assignments This appendix contains the pin assignments for many computer and workstation connectors. Some of these connectors may not be used on the product being serviced. Keyboard Connector and Icon Signal Data Unused Ground +5 VDC Clock Unused Mouse Connector and Icon Signal...

  • Page 75: Ethernet Rj-45

    Ethernet RJ-45 Connector and Icon Signal (+) Transmit Data (-) Transmit Data (+) Receive Data Unused Unused (-) Receive Data Unused Unused Parallel Interface Connector and Icon Signal Signal Strobe Acknowledge Data Bit 0 Busy Data Bit 1 Paper End Data Bit 2 Select Data Bit 3...

  • Page 76: Serial Interface, Powered And Non-Powered

    Serial Interface, Powered and Non-Powered Connector and Icon Signal Carrier Detect (12V if powered) Receive Data Transmit Data Data Terminal Ready Signal Ground Data Set Ready Request to Send Clear to Send Ring Indicator (5V if powered) Connector and Icon Signal +5 VDC - Data...

  • Page 77: Line-In Audio

    Line-in Audio Connector and Icon (1/8” miniphone) Signal 1 (Tip) Audio_In_Left 1 2 3 2 (Ring) Audio_In_Right 3 (Shield) Ground Line-out Audio Connector and Icon (1/8” miniphone) Signal 1 (Tip) Audio_Out_Left 1 2 3 2 (Ring) Audio_Out_Right 3 (Shield) Ground Monitor Connector and Icon Signal...

  • Page 78: 24-Pin Power

    24-Pin Power Connector Front Signal Signal Signal Signal +3.3V +3.3V +3.3V –12V open +5 Vaux +12V PSON +12V +3.3V 4-Pin Power (for CPU) Connector and Icon Signal +12V CPU -12V CPU SATA Data and Power Drive Connector Signal Signal Signal Signal Ground Ground...

  • Page 79: Pci Express

    Ground V 3.3 V 3.3 Ground Ground Ground Reserved Ground V 12 V 12 S = Data, P = Power PCI Express x1, x4, x8, and x16 PCI Express Connector Pin A Signal Signal Signal Signal Signal PRSNT1 JTAG3 PERST# PERp0 PERp1 +12V...

  • Page 80: Pci Express

    PERp14 PERn15 PERn14 PERp15 NOTE: x1 PCI Express uses pins 1-18 x4 PCI Express uses pins 1-32 x8 PCI Express uses pins 1-49 x16 PCI Express uses pins 1-8 PCI Express x1, x4, x8, and x16 PCI Express Connector Pin B Signal Signal Signal...

  • Page 81: Pci Express Mini Card

    PRSNT2# RSVD PETp15 PETn15 NOTE: x1 PCI Express uses pins 1-18 x4 PCI Express uses pins 1-32 x8 PCI Express uses pins 1-49 x16 PCI Express uses pins 1-8 PCI Express Mini Card PCI Express Mini Card Connector Signal Signal Signal Signal Signal...

  • Page 82: Appendix B Power Cord Set Requirements

    Power Cord Set Requirements The power supplies on some computers have external power switches. The voltage select switch feature on the computer permits it to operate from any line voltage between 100-120 or 220-240 volts AC. Power supplies on those computers that do not have external power switches are equipped with internal switches that sense the incoming voltage and automatically switch to the proper voltage.

  • Page 83: Country-Specific Requirements

    Country-Specific Requirements Additional requirements specific to a country are shown in parentheses and explained below. Country Accrediting Agency Country Accrediting Agency Australia (1) EANSW Italy (1) Austria (1) Japan (3) METI Belgium (1) CEBC Norway (1) NEMKO Canada (2) Sweden (1) SEMKO Denmark (1) DEMKO...

  • Page 84: Appendix C Troubleshooting

    Troubleshooting Safety and Comfort WARNING! Misuse of the computer or failure to establish a safe and comfortable work environment may result in discomfort or serious injury. Refer to the Safety & Comfort Guide available on the Web site at http://www.hp.com/ergo for more information on choosing a workspace and creating a safe and comfortable work environment.

  • Page 85: Helpful Hints

    To assist you in resolving problems online, HP Instant Support Professional Edition provides you with self-solve diagnostics. If you need to contact HP support, use HP Instant Support Professional Edition's online chat feature. Access HP Instant Support Professional Edition at: http://www.hp.com/go/ispe. Access the Business Support Center (BSC) at http://www.hp.com/go/bizsupport for the latest online...

  • Page 86: Solving General Problems

    ● If you have installed an operating system other than the factory-installed operating system, check to be sure that it is supported on the system. ● If the system has multiple video sources (embedded, PCI, or PCI-Express adapters) installed and a single monitor, the monitor must be plugged into the monitor connector on the source selected as the primary VGA adapter.
  • Page 87 Computer will not respond to USB keyboard or mouse. Cause Solution Keyboard or mouse is not connected to computer. Connect keyboard and mouse cables to computer. Computer is in standby mode. To resume from standby mode, press the power button or press any key.
  • Page 88 Poor performance is experienced. Cause Solution Too many applications running. Close unnecessary applications to free up memory. Some applications run in the background and can be closed by right-clicking on their corresponding icons in the task tray. To prevent these applications from launching at startup, go to Start >...

  • Page 89: Solving Hardware Installation Problems

    Computer is beeping and will not start. Cause Solution Internal error has occurred and the computer is beeping a Refer to Interpreting POST Audible Codes on page 85 code. interpret the error code. Solving Hardware Installation Problems You may need to reconfigure the computer when you add or remove hardware, such as an additional drive or expansion card.
  • Page 90 Computer will not start. Cause Solution Wrong memory modules were used in the upgrade or memory Review the documentation that came with the system to modules were installed in the wrong location. determine if you are using the correct memory modules and to verify the proper installation.

  • Page 91: Interpreting Post Audible Codes

    Interpreting POST Audible Codes This section covers the audible codes that may occur before or during POST that do not necessarily have an error code or text message associated with them. WARNING! When the computer is plugged into an AC power source, voltage is always applied to the system board.

  • Page 92: Contacting Customer Support

    Contacting Customer Support For help and service, contact an authorized reseller or dealer. To locate a reseller or dealer near you, 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.

  • Page 93: Appendix D Specifications

    Specifications Table D-1 Specifications Desktop Dimensions 14.76 in 37.5 cm Height 6.98 in 17.73 cm Width 16.88 in 42.87 cm Depth Approximate Weight 23.5 lb 10.66 kg Temperature Range 50° to 95°F 10° to 35°C Operating -22° to 140°F -30° to 60°C Nonoperating Relative Humidity (noncondensing) 10-90%...
  • Page 94 Table D-1 Specifications (continued) Rated Input Current (maximum) 8A @ 100 VAC 4A @ 200 VAC This system utilizes a passive power factor corrected power 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.

  • Page 95: Index

    Index Symbols/Numerics disassembly preparation 28 24-pin power pin assignments 72 diskette drive Insight Diagnostics 10 4-pin power pin assignments 72 installing 51 installing removing 50 diskette drive 51 drives hard drive 55 access panel locations 47 media card reader 51 removal and replacement 32 optical drive 49 electrostatic discharge (ESD)
  • Page 96 optical drive installing 49 safety precautions removing 48 cleaning 23 overheating, prevention 22 SATA connectors on system board 16 parallel interface pin data cable pinouts 17 assignments 69 hard drive characteristics 16 PCI card 40, 42 pin assignments 72 PCI Express card 40, 42 power cable pinouts 17 PCI Express Mini Card pin screws, correct size 25...

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Compaq dx2420

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