HP dx2420 Service Reference Guide: HP Compaq dx2420 Business PC
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- HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 1
Service Reference Guide HP Compaq dx2420 Business PC - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 2
. 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 written consent of Hewlett-Packard Company. Service Reference Guide Business PCs First Edition (March 2009) Document Part Number: 571399-001 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 3
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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 4
...25 Lithium Coin Cell Battery 26 6 Removal and Replacement Procedures Microtower (MT) Chassis Serial Number Location ...27 Preparation for Disassembly ...28 External Security Devices ...29 Cable Lock ...29 Padlock ...29 HP Business PC Security Lock 30 Computer Access Panel ...32 Front Bezel - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 5
a Drive into the 3.5-inch External Drive Bay 51 Removing an Internal 3.5-inch Hard Drive 53 Installing an Internal 3.5-inch Hard Drive 55 Front USB Panel ...58 Power Switch/LED Assembly ...59 Heat sink ...60 Processor ...61 Rear Chassis Fan ...62 Power Supply ...63 System Board ...64 Battery - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 6
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 ...85 Contacting Customer Support ...86 Appendix D Specifications Index ...89 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 7
do not apply. Additional information is available in online help after you install the operating system. Downloading Microsoft Windows Updates 1. To set up your Internet connection, click Start > Internet Explorer and follow the instructions on the screen. 2. Once an Internet connection has been - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 8
to reboot the machine. Installing or Upgrading Device Drivers When installing optional hardware devices after the operating system installation is complete, you must also install the drivers for each of the devices. If prompted for the i386 directory, replace the path specification with C:\i386, or - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 9
date and time. ● Set, view, change, or verify the system configuration, including settings for graphics, audio, storage, communications, and input devices. ● View settings for processor and memory. ● Modify the boot order of bootable devices such as hard drives, diskette drives, optical drives - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 10
exiting the F10 Setup screen. Computer Setup-Main NOTE: Support for specific Computer Setup options may vary depending on the hardware configuration you to select language. Floppy Diskette A: Allows you to set drive A to: ● Disabled ● 1.44 MB 3.5" ● Not Installed 4 Chapter 2 Computer Setup - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 11
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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 12
● DVMT Mode DVMT/Fixed Memory Allows you to set video memory size to: ● 128MB ● 256MB ● Maximum DVMT (available for DVMT Mode only) PS/2 Mouse Allows you to set: ● Disabled ● Enabled ● Auto Detect USB Legacy Mode Support Allows you to set: ● Disabled ● Enabled Onboard LAN Allows you to - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 13
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 After AC Power - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 14
and fourth or to disable any of the four: ● Floppy Group ● CD-ROM Group ● Hard Drive Group ● Network Boot Group NOTE: MS-DOS drive lettering assignments may not :Boot from LAN Disables/enables the F12 key boot from LAN during POST. Computer Setup-Exit NOTE: Support for specific Computer Setup - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 15
-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. This does not - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 16
downloaded from http://www.hp.com. See Downloading the Latest Version of HP Insight Diagnostics on page 14 for more information. NOTE: HP Insight the instructions in the wizard to create a Recovery Disc Set. 4. Use Windows Explorer to search the Recovery Disc Set for the CD with the compaq\hpdiags - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 17
about storage media connected to the computer. This list includes all fixed disks, diskette drives, and optical drives. System-Shows information about the computer model, processor, chassis, and BIOS, plus internal speaker and PCI bus information. HP Insight Diagnostics 11 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 18
these require user intervention. ● Custom Test-Provides the most flexibility in controlling the testing of a system. The Custom Test mode allows you to specifically select which devices, tests, and test parameters are run. For each test type, there are two test modes to choose from: ● Interactive - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 19
button is replaced with a Retest Help tab contains an HP Insight Diagnostics tab, an Error Codes tab, and a Test Components tab. The HP Insight Diagnostics tab contains problem. To find an error code description quickly, enter the code in the box at the top of the tab and click the Find Error Codes - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 20
number (for example, dx2400) in the text box and press the Enter key. 4. Select your specific computer model. 5. Select your OS. 6. Click the Diagnostic link. 7. Click HP Insight Diagnostics Offline Edition. 8. Select a language and click Download. NOTE: The download includes instructions on how to - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 21
Backup and Recovery Manager, refer to the HP Backup and Recovery Manager User Guide by selecting Start > HP Backup and Recovery > HP Backup and Recovery Manager Manual. NOTE: You can order a Recovery Disc Set from HP by calling the HP support center. Go to the following Web site, select your region - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 22
rate 7/7 15 39.37 in (100 cm) 400-700 mV 3.3 V, 5 V, 12 V N/A 3.0 Gb/s SATA connectors on the system board are color coded to make identification easier. SATA Identification Primary channel, device 0 Primary channel, device 1 Secondary channel, device 0 Secondary channel, device 1 Color Dark - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 23
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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 24
computer specification. Drive size calculations by drive manufacturers are bytes to the base 10 while calculations by Microsoft are bytes to the base 2. File System FAT 32 NTFS Drive/Partition Capacity Limits Controller Type ATA ATA Operating System Windows 2000/XP/Vista Windows 2000/XP/Vista - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 25
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 system board or component damage. Chassis Designation Microtower (MT) Figure 5-1 Microtower Configuration Chassis Designation 19 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 26
work perfectly throughout a normal cycle. The device may function normally for a while, but it has been degraded in the internal layers, reducing its life expectancy. Networks built into many integrated circuits provide some protection, but in many cases, the discharge contains enough power to alter - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 27
dissipative surfaces. ● Keep work area free of nonconductive materials such as ordinary plastic assembly aids and Styrofoam. ● Use field service tools, such as cutters, screwdrivers, and vacuums, that are conductive. Recommended Materials and Equipment Materials and equipment that are recommended - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 28
with hard tie to ground ● Field service kits ● Static awareness labels ● Wrist keyboard feet down, directly against the front of the desktop unit as this also restricts airflow. ● Occasionally clean monitor with any type of material. ● Install or enable power management functions of the operating - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 29
the keyboard body, follow the procedures described in Cleaning the Computer Case on page 23. When cleaning debris from under the keys, review all rules in General Cleaning Safety Precautions on page 23 before following these procedures: WARNING! Use safety glasses equipped with side shields before - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 30
space bar) from the keyboard. If these keys are improperly removed or installed, the keyboard may not function properly. CAUTION: Cleaning under a key may . Tools and Software Requirements To service the computer, you need the following: ● Torx T-15 screwdriver (HP screwdriver with bits, PN 161946- - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 31
process, it can damage the unit. HP strongly recommends that all screws removed parts being removed or replaced. CAUTION: When servicing this computer, ensure that packaging until they are actually mounted in the CPU. ● Avoid dropping drives from any height onto speakers. Service Considerations 25 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 32
See the appropriate removal and replacement chapter for the chassis you are working on in this guide for instructions on the replacement procedures. WARNING! This use the public collection system or return them to HP, their authorized partners, or their agents. 26 Chapter 5 Identifying - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 33
6 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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 34
system. 4. Remove any diskette, compact disc, or media card from the computer. 5. Turn off the computer and any Suspend" modes. The power cord should always be disconnected before servicing a unit. 6. Disconnect the power cord from the electrical Replacement Procedures Microtower (MT) Chassis - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 35
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 29 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 36
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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 37
3. Screw the lock to the chassis using the screw provided. 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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 38
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 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 39
Front Bezel 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. 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) - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 40
external drive bays that need to be removed before installing a drive. To remove a bezel blank: 1. blank needs to be replaced at a later date, you can order a replacement blank from HP. 3. To remove the Replace the front bezel. 34 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 41
● 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 on 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) - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 42
connectors are color-coded to make it easier card reader Front I/O audio Memory slots PCI 2.3 full-height slot PCI Express X16 slot PCI Express X1 slot PCI Express X1 slot Processor Clear CMOS/password header SATA drives RTC battery 36 Chapter 6 Removal and Replacement Procedures Microtower (MT - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 43
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 highperforming dual channel mode. For proper system operation, the DDR2-SDRAM DIMMs must be: ● industry-standard 240-pin - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 44
assigned to single channel. If one channel will have more memory than the other, the larger amount should be assigned to Channel A. ● In any mode, the maximum operational speed is determined by the slowest DIMM in the system. 38 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 45
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 memory capacity of Channel B. 4. Push the DIMM - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 46
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 back of the computer chassis. 40 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 47
, remove the 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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 48
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 expansion slot cover to close the open slot. 42 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 49
: 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. 8. 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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 50
external cables to the installed card, if needed. Connect internal cables to the system board, if needed. 11. Reconfigure the computer, if necessary. Refer to Computer Setup (F10) Utility on page 3 for instructions on using Computer Setup. Drives When installing additional drives, follow these - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - 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. to liquids, temperature extremes, or products that have magnetic fields such as monitors or speakers. If a drive must be mailed, place the drive in a bubble-pack mailer or - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 52
No. System Board Connector System Board Label 1 Media Card Reader JUSB2 2 Diskette Drive FDD1 3 SATA1 SATA1 4 SATA3 SATA3 5 SATA2 SATA2 6 SATA4 SATA4 Color white black dark blue light blue white orange 46 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 53
3.5-inch external 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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 54
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 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 55
page 28). 2. Remove the computer access panel (Computer Access Panel on page 32). 3. Remove the front bezel (Front Bezel on page 33). 4. If you are installing a drive 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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 56
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 Bezel on page 33). 50 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 57
drive. Figure 6-24 Disconnecting the Diskette Drive Cables 5. 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 The 3.5-inch external drive bay on the - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 58
FDD1. b. If installing a media card reader, connect the USB cable from the media card reader to the USB Replace the front bezel and access panel. 10. Lock any security devices that were disengaged when the access panel was removed. 52 Chapter 6 Removal and Replacement Procedures Microtower (MT - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 59
, 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. If you do not have this CD set, select Start > HP Backup - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 60
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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 61
(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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 62
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 mm (1.18 in) radius. A sharp bend can break the internal wires. 56 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 63
Figure 6-35 Securing the Hard Drive Cage 6. If installing a new drive, connect the opposite end of the data connector labeled SATA1 to avoid any hard drive performance problems. If you are adding a second hard drive, SATA1, SATA2, SATA4, SATA3. 7. Replace the computer access panel. 8. Lock any security - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 64
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 , reverse the removal procedure. 58 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 65
Power Switch/LED Assembly 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 Bezel on page 33). 4. Remove the optical drive (Removing an Optical Drive on page 48). - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 66
and allow the internal system components to from the system board (CPU FAN1). 4. Loosen 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. 60 Chapter 6 Removal and Replacement Procedures Microtower (MT - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 67
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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 68
may require replacing the system board. NOTE: After installing a new processor onto the system 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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 69
Power Supply 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 all power cables from the drives and from the system board. 4. Remove the four silver T15 screws that connect the power - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 70
insert the I/O panel back into the slots in the rear of the chassis, and then align the board with the chassis screw holes. NOTE: When replacing the system board, you must change the chassis serial number in the BIOS. 64 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 71
on page 32). NOTE: It may be necessary to remove an expansion card to gain access to the battery. 3. Locate the battery and battery holder on the system board. 4. Depending on the type of battery holder on your system board, complete the following instructions to replace the battery: Battery 65 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 72
, 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 the battery - Type 2 holder 3. Replace the computer access panel. 66 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 73
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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 74
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 Pin Signal 1 Data 2 Unused 3 Ground 4 +5 VDC 5 Clock 6 Unused Mouse Connector and Icon Pin Signal 1 Data 2 Unused - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 75
Ethernet RJ-45 Connector and Icon Parallel Interface Connector and Icon Pin Signal 1 Strobe 2 Data Bit 0 3 Data Bit 1 4 Data Bit 2 5 Data Bit 3 6 Data Bit Paper End 13 Select 14 Auto Linefeed 15 Error 16 Initialize Printer 17 Select IN 18-25 Signal Ground Ethernet RJ-45 69 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 76
Serial Interface, Powered and Non-Powered Connector and Icon Pin Signal 1 Carrier Detect (12V if powered) 2 Receive Data 3 Transmit Data 4 Data Terminal Ready 5 Signal Ground 6 Data Set Ready 7 Request to Send 8 Clear to Send 9 Ring Indicator (5V if powered) USB Connector and - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 77
Connector and Icon (1/8" miniphone) 1 23 Line-out Audio Connector and Icon (1/8" miniphone) 1 23 Monitor Connector and Icon Pin Signal 1 Red Analog 2 Green Analog 3 Blue Analog 4 Not used 5 DDC Serial Data 13 Horizontal Sync 14 Vertical Sync 15 DDC Serial Clock Line-in Audio 71 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 78
17 GND 18 GND Pin Signal 19 GND 20 open 21 +5V 22 +5V 23 +5V 24 GND 4-Pin Power (for CPU) Connector and Icon Pin Signal 1 GND 2 GND 3 +12V CPU 4 -12V CPU SATA Data and Power Drive Connector Pin Signal S1 Ground S5 B- Pin Signal S2 A+ S6 B+ Pin Signal S3 AS7 Ground - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 79
P1 Ground P5 BP9 V 5 P13 V 12 S = Data, P = Power P2 V 3.3 P6 Ground P10 Ground P14 V12 PCI Express x1, x4, x8, and x16 PCI Express Connector P3 V 3.3 P7 V 5 P11 Reserved P15 V 12 P4 Ground P8 V 5 P12 Ground Pin A Pin Signal 1 PRSNT1 2 +12V 3 +12V 4 GND 5 JTAG2 26 PERn(2) 27 GND 28 GND 29 PERp3 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 80
76 PERp14 81 PERn15 77 PERn14 82 GND 78 GND 79 GND 80 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 Pin Signal 1 +12V 2 +12V 3 RSVD 4 GND 5 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 81
uses pins 1-49 x16 PCI Express uses pins 1-8 PCI Express Mini Card PCI Express Mini Card Connector Pin Signal Pin Signal Pin Signal 1 WAKE# 7 CLKREQ# 13 # 48 +1.5V NOTE: *Reserved for future second PCI Express LAN (if needed) **Reserved for future wireless coexistence control interface ( - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 82
external power switches are equipped with internal switches that sense the incoming voltage the country where the power cord set will be installed. 2. The power cord set must have a minimum the power cord set is damaged in any manner, replace it immediately. Japanese Power Cord Requirements For use in - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 83
Requirements Additional requirements specific to a country are shown in parentheses and explained below. Country Accrediting Agency Country Accrediting Agency a two-pole grounding type with a Japanese Industrial Standard C8303 (7A, 125V) configuration. Country-Specific Requirements 77 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 84
isolate the exact problem before calling for technical support. ● Run the HP diagnostic tool. ● Run the hard drive self-test in Computer Setup. Refer to the Computer Setup (F10) Utility Guide for more information. ● Listen for a series of beeps from the computer. The beeps are error codes that will - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 85
number before calling. ● Spend time troubleshooting the problem with the service technician. ● Remove any hardware that was recently added to your system. ● Remove any software that was recently installed. NOTE: For sales information and warranty upgrades (Care Packs), call your local authorized - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 86
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 not blocked and the internal fan is running. 3. Contact an HP authorized reseller or service provider. Computer appears - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 87
to update the RTC date and time). If the problem persists, replace the RTC battery. See the Hardware Reference Guide for instructions on installing a Cause Processor is hot. Hard drive is full. Low on memory. Hard drive fragmented. Program previously accessed did not release reserved memory back - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 88
Microsoft Windows XP) or Start > All Programs > Accessories > Run (Microsoft Windows memory. Cause unknown. 3. Upgrade the graphics solution. Restart the computer. Blank screen (no video the same horizontal scan resolution chosen. rate as the resolution chosen. Monitor cable is Troubleshooting - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 89
and will not start. Cause Internal error has occurred and the computer is beeping a code. Solution Refer to Interpreting POST Audible Codes on page 85 to interpret the error code. Solving Hardware Installation Problems You may need to reconfigure the computer when you add or remove hardware - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 90
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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 91
graphics, replace the system board. 3 short beeps and 1 long beep followed by a three second pause CPU configuration error or invalid CPU 1. detected before graphics card initialized. 2. Upgrade the BIOS to proper version. Change the processor. 1 short beep followed by a one No legacy floppy - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 92
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 - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 93
D Specifications Table D-1 Specifications Desktop Dimensions Height 14.76 in 37.5 cm Width 6.98 in of change is 10° C/Hr. The upper limit may be limited by the type and number of options installed. Heat Dissipation Maximum 1575 BTU/hr 397 kg-cal/hr Typical (idle) 307 BTU/hr 77 kg-cal - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 94
Table D-1 Specifications (continued) Rated Input Current (maximum)1 8A @ 100 VAC 4A @ 200 VAC 1 This system utilizes a passive power factor corrected power supply. countries of the European Union. This supply requires the use of an input voltage range select switch. 88 Appendix D Specifications - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 95
cleaning 23 pin assignments 68 L line-in audio pin assignments 71 line-out audio pin assignments 71 locks cable lock 29 HP Business PC Security Lock 30 padlock 29 M media card reader installing 51 removing 50 memory removal and replacement 37 microphone pin assignments 70 monitor pin assignments - HP dx2420 | Service Reference Guide: HP Compaq dx2420 Business PC - Page 96
lock 29 HP Business PC Security Lock 30 padlock 29 serial interface pin assignments 70 serial number location 27 service considerations 24 software backing up 14 servicing computer 24 spare part number tamper-resistent wrench 25 Torx T-15 screwdriver 24 specifications computer 87 memory 37 static
Service Reference Guide
HP Compaq dx2420 Business PC