HP Dx2450 Service Reference Guide: HP Compaq dx2450 Business PC
HP Dx2450 - Compaq Business Desktop Manual
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- HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 1
Service Reference Guide HP Compaq dx2450 Business PC - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 2
that is protected by copyright. No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of Hewlett-Packard Company. Service Reference Guide Business PCs First Edition (March 2008) Document Part Number: 484988-001 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 3
or Upgrading Device Drivers 1 HP Backup and Recovery Manager ...2 2 Computer Setup (F10) Utility Computer Setup (F10) Utilities ...3 Using Computer Setup (F10) Utilities 3 Computer Setup-Main ...4 Computer Setup-Advanced 5 Computer Setup-Power ...6 Computer Setup-Boot ...7 Computer Setup - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 4
23 Power Supply Fan ...23 Tools and Software Requirements 23 Screws ...24 Cables and Connectors ...24 Hard Drives ...24 Lithium Coin Cell Battery 25 6 Removal and Replacement Procedures Microtower (MT) Chassis Serial Number Location ...26 Preparation for Disassembly ...27 External Security Devices - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 5
Power (for CPU) ...76 SATA Data and Power ...77 PCI Express ...77 PCI Express ...78 PCI Express Mini Card ...79 DVI Connector ...80 Appendix B Power Cord Set Requirements General Requirements ...81 Japanese Power Cord Requirements 81 Country-Specific Requirements ...82 Appendix C Troubleshooting - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 6
Appendix D System Board and Riser Board Reference Designators ...92 Appendix E Specifications Index ...100 vi - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 7
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 drivers and software, enter the model number of the computer, and press Enter. Installing - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 8
Follow the instructions in the wizard. For more information on using HP 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 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 9
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. ● View settings for processor and memory - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 10
CAUTION: Do NOT turn the computer power OFF while the ROM is saving the Computer Setup (F10) changes because the 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 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 11
2-2 Computer Setup-Advanced Option Description CPU Type (view only) CPU Speed (view only) Cache RAM (L2) (view only) Cache RAM (L3) (view only - some models) Primary Video Adapter Allows you to select the boot display device when more than 2 video options are offered by the system: ● PCI - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 12
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 Failure Allows you to select system restart behavior - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 13
within hard drives. Priority Network Group Boot Priority Specifies boot device priority within bootable network devices. Computer Setup-Exit NOTE: Support for specific Computer Setup options may vary depending on the hardware configuration. Table 2-5 Computer Setup-Exit Option Description - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 14
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 include updates to system date, system time, supervisor password, user password, and CPU frequency multiplier. 8 Chapter 2 Computer Setup (F10 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 15
) and click Next. 3. Follow 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 directory. 5. While the computer is on, insert the CD into an optical drive on the computer. HP Insight Diagnostics 9 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 16
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) and serial (COM) port settings, plus USB and network controller information. Graphics-Shows - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 17
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 is displayed for use if you want to cancel the test. HP Insight Diagnostics 11 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 18
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: ● The devices action that should help solve the problem. To find an error code - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 19
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 create the bootable CD. Protecting the - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 20
Follow the instructions in the wizard. For more information on using HP 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 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 21
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 Data interface voltage differential Drive voltages Jumpers for configuring drive Data transfer rate 7/7 15 39.37 in - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 22
drives. Current HP desktop products ship signal pair Device Plug Ground Transmit power 3.3 V power 3.3 V power 5 V power 5 V power Pin Usage Notes P9 V5 5 V power P10 Ground P11 Ground P12 Ground P13 V12 12 V power P14 V12 12 V power P15 V12 12 V power 16 Chapter 4 Serial - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 23
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 Maximum Size Partition 32 GB 2 TB Drive 2 TB 2 TB PATA Device Information 17 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 24
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. You must disconnect the power cord from the power source before opening the computer to prevent system board or component damage - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 25
Networks built into many integrated circuits provide some protection, but in many cases, the discharge contains enough power to alter device Humidity 40% 15,000 V 5,000 V 800 V 700 V 4,000 V 5,000 V 20,000 V 11,000 V 10% 35,000 V 12,000 V 6,000 V 2,000 V 11,500 V 14,500 V 26,500 V 21,000 V - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 26
are flexible straps with a maximum of one-megohm ± 10% resistance in the ground cords. To provide proper ground, at static-free work areas. ● Turn off power and input signals before inserting and removing connectors or aids and Styrofoam. ● Use field service tools, such as cutters, screwdrivers, - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 27
to ground ● Field service kits ● Static awareness labels ● Wrist straps and footwear straps providing one-megohm +/- 10% resistance ● Material handling from the computer and keyboard. ● Never cover the ventilation slots on the monitor with any type of material. ● Install or enable power management - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 28
. To clean the tops of the keys or the keyboard body, follow the procedures described in Cleaning the Computer Case on page 22. When cleaning debris from under the keys, review all rules in General Cleaning Safety Precautions on page 22 before following these procedures: CAUTION: Use safety glasses - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 29
mouse body, follow the procedures in Cleaning the Computer Case on page 22. Service Considerations Listed below are some of the considerations that you should keep in mind during the disassembly and assembly of the computer. Power Supply Fan The power supply fan is a variable-speed fan based on the - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 30
or snagged by parts being removed or replaced. CAUTION: When servicing this computer, ensure that cables are placed in CPU. ● Avoid dropping drives from any height onto any surface. ● If you are inserting or removing a hard drive, turn off the computer. Do not remove a hard drive while the computer - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 31
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. WARNING! This computer contains a lithium - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 32
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 of the computer. Keep these numbers available for use when contacting customer service for assistance. 26 Chapter 6 Removal and Replacement - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 33
system. 4. Remove any diskette, compact disc, or media card from the computer. 5. Turn off the computer and any peripheral devices that are connected to it. CAUTION: Turn off the computer before disconnecting any cables. Regardless of the power-on state, voltage is always present on the system board - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 34
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 Padlock 28 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 35
HP Business PC Security Lock 1. Fasten the security cable by looping it around a stationary object. 2. Thread the keyboard and mouse cables through the lock. External Security Devices 29 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 36
3. Screw the lock to the chassis using the screw provided. 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. 30 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 37
on page 27). 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. 2. Loosen the screw (1) that secures the access panel to the computer chassis. 3. Slide the access panel back (2) about - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 38
side of the bezel off the chassis (2) followed by the left side. To reinstall the front bezel, reverse the removal procedure. 32 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 39
-inch blank, press the two tabs on the left side of the blank (2) toward the right, and then pull the blank inward to remove it (3). 3. Replace the front bezel. Removing Bezel Blanks 33 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 40
the computer. ● Keep cables away from major heat sources like the heatsink. ● Do not jam cables on top of expansion cards or memory modules. Printed circuit cards cable could damage the cable and result in a failed power supply. 34 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 41
Description Power supply, 24-pin Power supply, 4-pin Diskette drive Heatsink fan Chassis fan Front power button/LED Front I/O USB Media card reader Front I/O audio Internal speaker Memory slots PCI 2.3 full-height slot PCI Express X1 slot PCI Express X1 slot PCI Express X16 slot Processor Clear - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 42
the mandatory JEDEC SPD information In addition, the computer supports: ● 512Mbit and 1Gbit non-ECC memory technologies ● single-sided and double-sided DIMMs ● DIMMs constructed with x8 and x16 DDR devices; DIMMs constructed with x4 SDRAM are not supported NOTE: The system will not operate properly - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 43
DIMM would not be the same size because they have different numbers of memory chips on them. ● The system will operate in single channel mode if the DIMMs are populated in any other supported configuration. Supported configurations consist of any combination of one, two, three, or four DIMMs as long - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 44
. 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 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 45
expansion slot 2 PCI Express x1 expansion 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 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 46
an expansion card in a vacant socket, you must use a flatblade 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 expansion card you are installing. 40 Chapter 6 Removal and Replacement Procedures Microtower (MT - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 47
components. 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. CAUTION: After removing an expansion card, you must replace it with a new card or expansion slot cover for proper cooling of - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 48
to the installed card, if needed. Connect internal cables to the system board, if needed. 11. Reconfigure the computer, if necessary. Refer to the Computer Setup (F10) Utility Guide for instructions on using Computer Setup. 42 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 49
guidelines: ● The primary Serial ATA (SATA) hard FLOPPY. ● Connect a media card reader to the USB connector labeled F_USB2. ● The system does not support Parallel ATA (PATA) optical drives HP-supplied 6-32 standard screws (1) are silver. The HP-supplied M3 metric guide screws (2) are black. Drives 43 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 50
properly, turn off the computer, and unplug the power cord. Do not remove a drive while the computer is on or in standby Card Reader F_USB2 2 SATA0 SATA0 3 SATA1 SATA1 4 SATA2 SATA2 Color black dark blue white light blue 44 Chapter 6 Removal and Replacement Procedures Microtower (MT - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 51
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 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 52
on page 32). 4. Disconnect the power cable (1) and data cable (2) from the rear of the optical drive. 5. Remove the screws that secure the drive to the drive cage (1), then slide the drive out of the front of the chassis (2). 46 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 53
insert a flat screwdriver into the knockout plate slot and rotate the screwdriver to break the knockout plate on the drive is evenly aligned with the computer front bezel and install the M3 metric retainer drives are black. 8. If the system configuration includes only one optical drive, connect the - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 54
Connect the power cable (1) and data cable (2) to the rear of the optical drive. 10. Replace the front bezel and access panel. 11. Lock any security devices that were disengaged when the access panel was removed. The system automatically recognizes the drive and reconfigures the computer. Removing - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 55
4. Disconnect the drive cables, as indicated in the following illustrations: a. If you are removing a diskette drive, disconnect the data cable (1) and power cable (2) from the back of the drive. b. If you are removing a media card reader, disconnect the USB cable from the system board. Drives 49 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 56
slot and rotate the screwdriver 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 them before inserting the drive into the chassis. 50 Chapter 6 Removal and Replacement Procedures Microtower (MT - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 57
aligned with the computer front bezel and card reader to the USB connector on the system board labeled F_USB2. NOTE: Refer to System Board Drive Connections on page 44 for an illustration of the system board drive connectors. 9. Replace the front bezel and access panel. 10. Lock any security devices - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 58
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. If you do not have this CD set, select Start - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 59
5. Lift the hard disk drive cage out of the chassis. 6. Disconnect the power cable (1) and data cable (2) from the back of the hard drive. Drives 53 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 60
out of the hard disk drive cage (2). Installing an Internal 3.5-inch Hard Drive 1. Follow the steps in Removing an Internal 3.5-inch Hard Drive on page 52 to remove the hard drive cage and, if necessary, the existing hard drive. 54 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 61
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 the interior of the front bezel. The 6-32 screws are silver. 3. Connect the power cable (1) and data cable (2) to the back of the hard drive. CAUTION: - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 62
secure the hard disk drive cage to the 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: SATA0, SATA1, SATA3, SATA2. 7. Replace the computer access panel. 8. Lock any security devices - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 63
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 1. Prepare the computer for disassembly (Preparation for Disassembly on page 27). 2. - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 64
the clamps enough to remove the cable. 7. To remove the power button assembly, perform the following steps simultaneously: a. On the right away from the chassis enough to loosen the tabs from their slots in the chassis. 8. Pull the assembly away from the Replacement Procedures Microtower (MT) Chassis - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 65
computer for disassembly (Preparation for Disassembly on page 27). 2. Remove the computer access panel (Computer Access Panel on page 31). 3. Unplug the fan cable from the system board (CPU the processor. 7. Remove the heatsink from the processor. When of the processor. CAUTION: Heatsink retaining screws should - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 66
To remove the backplate from the system board: 1. Remove the four silver Phillips screws that secure the backplate to the system board. 2. Remove the backplate from the system board. 60 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 67
pins are damaged it may be necessary to replace the system board. The heatsink must be installed within 24 hours of installing the processor to prevent damage to the processor's solder connections. To install a new processor: 1. Place the processor in its socket and close the retainer. 2. Secure - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 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 Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 69
then down to the system board. Rear Chassis Fan 1. Prepare the computer for disassembly (Preparation for Disassembly on page 27). 2. Remove the computer access panel (Computer Access Panel on page 31). 3. Disconnect the fan control cable from the red system board connector labeled SYS_FAN1. 4. From - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 70
the power supply to the chassis. 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. 6. Lift the power supply out of the chassis. 64 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 71
To install the power supply, reverse the removal procedure. System Board 1. Prepare the computer for disassembly (Preparation for Disassembly on page 27). 2. Remove the computer access panel (Computer Access Panel on page 31). 3. Remove all expansion boards (Expansion Cards on page 39). 4. - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 72
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: 66 Chapter 6 Removal and Replacement Procedures Microtower (MT - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 73
automatically secures the battery in the proper position. 4. Replace the computer access panel. 5. Plug in the computer and turn on power to the computer. 6. Reset the date and time and any special system setups using Computer Setup. Refer to Computer Setup (F10) Utility on page 3. Type 2 Battery - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 74
new battery and position the clip back in place. 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. 68 Chapter 6 Removal and - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 75
A 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 Pin Signal 1 Data 2 Unused 3 Ground 4 +5 VDC 5 Clock 6 Unused - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 76
(+) Transmit Data 2 (-) Transmit Data 3 (+) Receive Data 4 Unused 5 Unused 6 (-) Receive Data 7 Unused 8 Unused Pin Signal 9 Positive AUI Differential Receive 10 +12V 11 Ground 12 Ground 13 Unused 14 Unused 15 Unused 16 Unused 70 Appendix A Connector Pin Assignments - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 77
Data Bit 5 8 Data Bit 6 9 Data Bit 7 Pin Signal 10 Acknowledge 11 Busy 12 Paper End 13 Select 14 Auto Linefeed 15 Error 16 Initialize Printer 17 Select IN 18-25 Signal Ground Serial Interface, Powered and Non-Powered Connector and Icon Pin Signal 1 Carrier Detect (12V if - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 78
USB Connector and Icon Microphone Connector and Icon (1/8" miniphone) 1 23 Headphone Connector and Icon (1/8" miniphone) 1 23 Line-in Audio Connector and Icon (1/8" miniphone) 1 23 Line-out Audio Connector and Icon (1/8" miniphone) 1 23 72 Appendix A Connector Pin Assignments Pin Signal 1 +5 VDC - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 79
5 Mode 6 Not Used 7 Not Used 8 Not Used Pin Signal 1 Red Analog 2 Green Analog 3 Blue Analog 4 Not used 5 Ground 6 Ground 7 Ground 8 Ground Pin Signal 9 +5V (fused) 10 Ground 11 Not used 12 DDC Serial Data 13 Horizontal Sync 14 Vertical Sync 15 DDC - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 80
ATA/ATAPI (IDE) Standard Drive Cable Connector Pin Signal 1 Reset 2 Ground 3 DD7 4 DD8 5 DD6 6 DD9 7 DD5 8 DD10 9 DD4 10 DD11 11 DD3 12 DD12 13 DD2 14 DD13 Pin Signal 15 DD1 16 DD14 17 DD0 18 DD15 19 Ground 20 (Key) 21 DMARQ - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 81
CD-ROM 50-Pin Connector Connector Pin Signal 1 Audio L-ch 2 Audio R-ch 3 Audio GND 4 GND 5 RESET 6 DD8 7 DD7 8 DD9 9 DD6 10 DD10 11 DD5 12 DD11 13 DD4 24-Pin Power Connector 24 12 Pin Signal 1 +3.3V 2 +3.3V 3 GND 4 +5V 5 GND 6 +5V Pin Signal 14 DD12 15 DD3 16 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 82
10 Tach 11 GND 12 Fan-CMD Front Pin Signal 13 +12V 14 +5V Sense 15 GND 16 +5V 17 +5V 18 +3.3V Pin Signal 19 GND 20 +3.3V 21 Sense 22 +3.3V 23 +3.3V 24 GND 4-Pin Power (for CPU) Connector and Icon Pin Signal 1 GND 2 GND 3 +12V CPU 4 -12V CPU 6-Pin Power (for CPU) Connector - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 83
Drive Connector Pin Signal S1 Ground S5 BP1 Ground P5 BP9 V 5 P13 V 12 S = Data, P = Power Pin Signal S2 A+ S6 B+ P2 V 3.3 P6 Ground P10 Ground P14 V12 PCI Express x1, x4, x8, and x16 PCI Express Connector Pin Signal S3 AS7 Ground P3 V 3.3 P7 V 5 P11 Reserved P15 V 12 Pin Signal S4 Ground P4 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 84
, x8, and x16 PCI Express Connector 67 GND 68 PERp12 69 PERn12 70 GND 72 PERp13 73 PERn13 74 GND 75 GND Pin B Pin Signal 1 +12V 2 +12V 3 RSVD 4 GND 5 SMCLK 26 GND 27 PETp3 28 PETn3 29 GND 30 RSVD 51 PETn8 Pin Signal 6 SMDAT 7 GND 8 +3.3 V 9 JTAG1 10 3.3vAux 31 PRSNT2# 32 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 85
63 PETn11 64 GND 65 GND PCI Express Mini Card PCI Express Mini Card Connector 67 PETn12 68 GND 69 GND 70 PETp13 72 GND 73 GND 74 PETp14 75 PETn14 Pin Signal 1 WAKE# 2 3.3V 3 Reserved** 4 GND 5 Reserved** 6 1.5V Pin Signal 7 CLKREQ# 8 UIM_PWR 9 GND 10 UIM_DATA 11 REFCLK12 UIM_CLK Pin Signal - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 86
NOTE: *Reserved for future second PCI Express LAN (if needed) **Reserved for future wireless coexistence control interface (if needed) ***Reserved T.M.D.S. Data1- 10 T.M.D.S. Data1+ 11 T.M.D.S. Data1/3 Shield 12 T.M.D.S. Data3- Pin Signal 13 T.M.D.S. Data3+ 14 +5V Power 15 Ground ( - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 87
B 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 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 88
1. The flexible cord must be Type HO5VV-F, 3-conductor, 0.75mm2 conductor size. Power cord set fittings (appliance coupler and wall plug) must bear the certification mark of grounding type with a Japanese Industrial Standard C8303 (7A, 125V) configuration. 82 Appendix B Power Cord Set Requirements - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 89
the computer to the Safe Mode to see if it will boot without all of the drivers loaded. When booting the operating system, use "Last Known Configuration." ● Refer to the comprehensive online technical support at http://www.hp.com/support. ● Refer to Helpful Hints on page 84 in this guide for more - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 90
down the computer serial number and product ID number, and the monitor serial 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 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 91
switch on rear of computer chassis (some Select the proper AC voltage using the selector switch. models) not switched to correct line voltage (115V or 230V). A defective PCI card has been installed. Remove any expansion board that was just installed. Drive data or power supply cables may not be - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 92
prolongs the life of the RTC battery. First, reset the date and time under Control Panel (Computer Setup can also be used 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 new battery, or contact an - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 93
Windows XP) or Start > All Programs > Accessories > Run (Microsoft Windows Vista) and type msconfig. On the Startup tab of the System Configuration memory. Cause unknown. 3. Upgrade the graphics solution. Restart the computer power button for more than four seconds. Otherwise, the computer computer. - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 94
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. If you install a plug and play device, the Windows operating system automatically recognizes the device and configures the computer. If you - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 95
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 90 to determine possible causes. 3. If you still cannot resolve the issue, contact Customer Support. Solving Hardware Installation Problems 89 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 96
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 drive or optical drive second pause found. 1. Check cable connections. 2. Run the Computer Setup utility and ensure the device port - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 97
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 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 98
block recovery header ROM recovery header CPLD programming header Clear Password header/jumper Clear CMOS header RJ45 jack Stacked RJ45/Dual USB Quad stacked USB First IEEE 1394 connector Second IEEE 1394 connector SPDIF input SPDIF output PCI slots PCI extender slot (male) PCI Express slots Primary - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 99
slot for graphics First parallel port Second parallel port Double-stacked parallel port, Top = Port B, Bottom = Port A Parallel port over single Serial Port Parallel port over Serial Port and Video Port Parallel port over dual VGA ports DVI connector Keyboard connector, PS/2 (Closest to power supply - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 100
1 P26 Internal USB connector 2 P27 MultiBay header P29 SCSI LED connector P30 PCI extender slot (female) P40 Blade PC graphics connector (outboard) P41 Blade PC graphics connector (inboard) P52 Second serial port 94 Appendix D System Board and Riser Board Reference Designators - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 101
serial port Double stack serial port, Top = Serial B, Bottom = Serial A Riser edge connector (male-mates with J30) PrimarySerial ATA (SATA) connector Second Serial ATA (SATA) connector Third Serial ATA (SATA) connector Fourth Serial ATA (SATA) connector VSFF expansion connector Graphics option - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 102
serial port transceiver VRM controller USB front port power switch First USB rear port power switch Second USB rear port power switch Third USB rear port power switch Battery retainer Memory slot. DIMM1 or RIMM1 populated and tested Following memory slots Primary processor socket Secondary processor - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 103
Y4 Y5/H5 Secondary NIC clock crystal RTC clock crystal/tie-down 97 - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 104
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 1575 BTU/hr 397 kg-cal/hr Typical (idle) 307 BTU/hr 77 kg-cal/hr Power Supply 115V 230V Operating Voltage Range 90-132 VAC - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 105
Table E-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. The power factor correction is present in the 230V operating mode only. This allows the system to pass the CE mark requirements for - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 106
ethernet AUI pin assignments 70 BNC pin assignments 69 RJ-45 pin assignments 70 expansion cards removal and replacement 39 expansion slot cover removing 40 replacing 41 external security 28 F fan, power supply 23 front bezel removal and replacement 32 removing blanks 33 front USB panel removal and - HP Dx2450 | Service Reference Guide: HP Compaq dx2450 Business PC - Page 107
panel 57 heatsink 59 memory 36 power supply 64 power switch/LED assembly 58 processor 61 rear chassis fan 63 speaker 62 system board 65 removing bezel blanks 33 diskette drive 48 expansion slot cover 40 hard drive 52 media card reader 48 optical drive 46 PCI card 41 PCI Express card 41 riser board
Service Reference Guide
HP Compaq dx2450 Business PC