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HP Compaq dx2450 Business PC - 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.
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.
Figure :
Preparation for Disassembly
See Identifying the Chassis, Routine Care, and Disassembly Preparation for initial safety procedures.
  1. Remove/disengage any security devices that prohibit opening the computer (External Security Devices).
  2. Close any open software applications.
  3. Exit the operating 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 as long as the system is plugged into an active AC outlet. In some systems the cooling fan is on even when the computer is in the “Standby,” or “Suspend” modes. The power cord should always be disconnected before servicing a unit.
  6. Disconnect the power cord from the electrical outlet and then from the computer.
  7. Disconnect all peripheral device cables from the computer.
  8. Lay the computer down on its side to achieve a safe working position.
      note:
    During disassembly, label each cable as you remove it, noting its position and routing. Keep all screws with the units removed.
  caution:
The screws used in the computer are of different thread sizes and lengths; using the wrong screw in an application may damage the unit.
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 :
Padlock
Figure :
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.
  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.
Computer Access Panel
  1. Prepare the computer for disassembly (Preparation for Disassembly).
      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 1.3 cm (1/2 inch), then lift it off the unit.
Figure :
To install the access panel, reverse the removal procedure.
Front Bezel
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Press outward on the three latches on the right side of the bezel (1), then rotate the right side of the bezel off the chassis (2) followed by the left side.
    Figure :
To reinstall the front bezel, reverse the removal procedure.
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:
  1. Remove the front bezel.
  2. To remove a 5.25-inch blank, break the blank out of the bezel (1).
    – or –
    To remove a 3.25-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.
Cable Management
Always follow good cable management practices when working inside 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 like these are not designed to take excessive pressure on them.
  • Keep cables clear of sliding or moveable parts to prevent them from being cut or crimped when the parts are moved.
  • When folding a flat ribbon cable, never fold to a sharp crease. Sharp creases may damage the wires.
  • Some flat ribbon cables come pre-folded. Never change the folds 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) radius.
  • Never crease a SATA data cable.
  • Do not rely on components like the drive cage, power supply, or computer cover to push cables down into the chassis. Always position the cables to lay properly by themselves.
When removing the power supply power cables from the P1 or P3 connectors on the system board, always follow these steps:
  1. Squeeze on the top of the retaining latch attached to the cable end of the connector (1).
  2. Grasp the cable end of the connector and pull it straight up (2).
      caution:
    Always pull the connector - NEVER pull on the cable. Pulling on the cable could damage the cable and result in a failed power supply.
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
ATXPOWER
white
Power supply, 24-pin
ATX_CPU
white
Power supply, 4-pin
FLOPPY
black
Diskette drive
CPU_FAN
white
Heatsink fan
CHASSIS_FAN
red
Chassis fan
F_PANEL
black
Front power button/LED
F_USB1
white
Front I/O USB
F_USB2
black
Media card reader
F_AUDIO
yellow
Front I/O audio
SPEAKER
white
Internal speaker
XMM1
XMM2
XMM3
XMM4
black
black
blue
blue
Memory slots
PCI 1
white
PCI 2.3 full-height slot
PCIE_X1_1
black
PCI Express X1 slot
PCIE_X1_2
black
PCI Express X1 slot
PCIE X16
black
PCI Express X16 slot
PROCESSOR
silver
Processor
CMOS+PW
black with blue cap
Clear CMOS/password header
SATA0
SATA1
SATA2
SATA3
dark blue
white
light blue
orange
SATA drives
BATTERY
black
RTC battery
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 four 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.
For proper system operation, the DDR2-SDRAM DIMMs must be:
  • industry-standard 240-pin
  • unbuffered, PC2-5300 667 MHz-compliant or PC2-6400 800 MHz-compliant
  • 1.8 volt DDR2-SDRAM DIMMs
The DDR2-SDRAM DIMMs must also:
  • support CAS latency 5 DDR2 667 Mhz (5-5-5 timing), CAS latency 5 DDR2 800 Mhz (5-5-5 timing), and CAS latency 6 DDR2 800 Mhz (6-6-6 timing)
  • contain the mandatory JEDEC SPD information
In addition, the computer supports:
  • 512Mbit and 1Gbit non-ECC memory technologies
  • single-sided and double-sided DIMMs
  • DIMMs constructed with x8 and x16 DDR devices; DIMMs constructed with x4 SDRAM are not supported
  note:
The system will not operate properly if you install unsupported DIMMs.
There are four DIMM sockets on the system board, with two sockets per channel. The sockets are labeled XMM1, XMM2, XMM3, and XMM4. Sockets XMM1 and XMM2 operate in memory channel A. Sockets XMM3 and XMM4 operate in memory channel B.
Figure :
Item
Description
Socket Color
1
DIMM socket XMM1, Channel A (populate first)
Black
2
DIMM socket XMM2, Channel B (populate second)
Black
3
DIMM socket XMM3, Channel A
Blue
4
DIMM socket XMM4, Channel B
Blue
The system will automatically operate in single channel mode or dual channel mode, depending on how the DIMMs are installed.
  • The system will operate in a higher-performing dual channel mode if like-sized DIMMs of equal capacity are populated in one or both pairs of sockets. For example, if the Channel A XMM1 socket and Channel B XMM2 socket (the two black sockets) both have 1024MB DIMMs installed, the system will operate in dual channel mode. If this system had two additional DIMMs added into the blue sockets, they could be a pair of 512MBor 1024MB DIMMs and the system would still operate in dual channel mode. For purposes of “like sizes,” a single-sided 512MB DIMM and a double-sided 512MB 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 as socket XMM1 is populated before socket XMM3 in Channel A, and socket XMM2 is populated before socket XMM4 in Channel B.
  • If a single DIMM is installed, it must be installed in the XMM1 socket.
  • In either mode, the maximum operational speed is determined by the slowest DIMM in the system.
  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. Refer to Electrostatic Discharge Information for more information.
When handling a memory module, be careful not to touch any of the contacts. Doing so may damage the module.
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Open both latches of the memory module socket (1), and insert the memory module into the socket (2).
      note:
    A memory module can be installed in only one way. Match the notch on the module with the tab on the memory socket. A DIMM must occupy the black XMM1 socket.
      note:
    For maximum performance, populate the sockets so that the memory capacity is spread as equally as possible between Channel A and Channel B.
  4. Push the DIMM module down firmly into the socket, ensuring that the module is fully inserted and properly seated. The DIMM must be pushed all the way down into the socket and sit evenly in the socket to avoid memory corruption. Make sure the latches are in the closed position (3).
  5. Repeat steps 3 and 4 for any additional modules that you want to install.
  note:
The computer automatically recognizes the additional memory when turned on.
To reassemble the computer, reverse the removal procedure.
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 :
Expansion Slot Locations
Item
Description
1
PCI 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 for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Locate the correct vacant expansion socket on the system board and the corresponding expansion slot on the back of the computer chassis.
  4. 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 :
  5. Before installing an expansion card, 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.
    1. If you are installing 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.
    2. 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.
    3. If you are removing a PCI Express x16 card, pull the retention arm on the back of the expansion socket away from the card and carefully rock the card back and forth until the connectors pull free from the socket. Be sure not to scrape the card against the other components.
  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 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 chassis so that the bottom of the bracket on the card slides into the small slot on the chassis. Press the card straight down into the expansion socket on the system board.
      note:
    When installing an expansion card, press firmly on the card so that the whole connector seats properly in the expansion card slot.
  9. Replace the slot cover lock and secure it in place with the screw that was previously removed.
  10. Connect 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 the Computer Setup (F10) Utility Guide for instructions on using Computer Setup.
Drives
When installing additional drives, follow these guidelines:
  • The primary Serial ATA (SATA) hard drive must be connected to the dark blue primary SATA connector on the system board labeled SATA0.
  • Connect the first SATA optical drive to the white SATA connector on the system board labeled SATA1.
  • Always populate the dark blue SATA0 and white SATA1 connectors before the light blue SATA2 and orange SATA3 connectors.
  • Connect a second SATA optical drive to the orange SATA3 connector.
  • Connect additional SATA hard drives to the next available (unpopulated) SATA connector on the system board in the following order: SATA0, SATA1, SATA3, SATA2.
  • Connect a diskette drive to the connector labeled FLOPPY.
  • Connect a media card reader to the USB connector labeled F_USB2.
  • The system does not support Parallel ATA (PATA) optical drives or PATA hard drives.
  • You may install either a third-height or a half-height drive into a half-height bay.
  • If needed, HP has provided extra drive retainer screws on the interior of the front bezel that are used to secure the drives in the drive cage. Hard drives use 6-32 standard screws. All other drives use M3 metric screws. The HP-supplied 6-32 standard screws (1) are silver. The HP-supplied M3 metric guide screws (2) are black.
  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. Do not remove a drive while the computer is on or in standby mode.
Before handling a drive, ensure that you are discharged of static electricity. While handling a drive, avoid touching the connector.
Handle a drive carefully; do not drop it.
Do not use excessive force when inserting a drive.
Avoid exposing a hard drive to liquids, temperature extremes, or products that have magnetic fields such as monitors or speakers.
If a drive must be mailed, place the drive in a bubble-pack mailer or other protective packaging and label the package “Fragile: Handle With Care.”
System Board Drive Connections
Refer to the following illustration and table to identify the system board drive connectors.
System Board Drive Connections
No.
System Board Connector
System Board Label
Color
1
Media Card Reader
F_USB2
black
2
SATA0
SATA0
dark blue
3
SATA1
SATA1
white
4
SATA2
SATA2
light blue
5
SATA3
SATA3
orange
6
Diskette Drive
FLOPPY
black
To verify the type, size, and capacity of the storage devices installed in the computer, run Computer Setup. Refer to Computer Setup (F10) Utility for more information.
Drive Positions
Figure :
1
Two 5.25-inch external drive bays for optional drives (optical drives shown)
2
One 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 Setup (F10) Utility for more information.
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:
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Remove the front bezel (Front Bezel).
  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).
Installing an Optical Drive into the 5.25-inch Drive Bay
To install an optional 5.25-inch optical drive:
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Remove the front bezel (Front Bezel).
  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 Blanksfront bezelremoving blanksremovingbezel blanks for more information.
  5. If you are adding a drive to an empty lower optical drive bay, you must remove the knockout plate from the bay. To do so, insert a flat screwdriver into the knockout plate 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 the screws before inserting the drive into the chassis.
  7. Slide the drive in through the front of the chassis (1) until the bezel on the drive is evenly aligned with the computer front bezel and install the M3 metric retainer screws (2) as shown in the illustration below.
      note:
    Extra drive retainer screws are provided on the interior of the front bezel if needed. The M3 metric retainer screws for optical drives are black.
  8. If the system configuration includes only one optical drive, connect the SATA data cable to the white system board connector labeled SATA1 . If you are adding a second optical drive, connect the SATA data cable to the orange system board connector labeled SATA3.
  9. 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 an External 3.5-inch Drive
  caution:
All removable media should be taken out of a drive before removing the drive from the computer.
  note:
The 3.5-inch drive bay may contain a diskette drive or a media card reader.
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Remove the front bezel (Front Bezel).
  4. Disconnect the drive cables, as indicated in the following illustrations:
    1. If you are removing a diskette drive, disconnect the data cable (1) and power cable (2) from the back of the drive.
    2. If you are removing a media card reader, disconnect the USB cable from the system board.
  5. Remove the retainer screws that secure the drive to the bay (1) then slide the drive forward and out of the bay (2).
    Figure :
Installing a Drive into the 3.5-inch External Drive Bay
The 3.5-inch external drive bay on the front of the computer can be configured with a media card reader or a diskette drive.
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Remove the front bezel (Front Bezel).
  4. 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 Blanksfront bezelremoving blanksremovingbezel blanks for more information.
  5. If you are adding a drive to an empty drive bay for the first time, you must remove the knockout plate from the bay. To do so, insert a flat screwdriver into the knockout plate 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.
  7. Slide the drive in through the front of the chassis (1) until the bezel on the drive is evenly aligned with the computer front bezel and install the M3 metric retainer screws (2) as shown in the illustration below.
      note:
    Extra drive retainer screws are provided on the interior of the front bezel if needed. The M3 metric retainer screws for diskette drives or media card readers are black.
  8. Connect the appropriate drive cables:
    1. If installing a diskette drive, connect the power and data cables to the rear of the drive and connect the other end of the data cable to the connector on the system board labeled FLOPPY.
    2. If installing a media card reader, connect the USB cable from the media card reader to the USB connector on the system board labeled F_USB2.
        note:
      Refer to System Board Drive Connections for an illustration of the system board drive connectors.
  9. Replace the front bezel and access panel.
  10. Lock any security devices that were disengaged when the access panel was removed.
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. If you do not have this CD set, select Start > HP Backup and Recovery and create it now.
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Remove the two screws that secure the hard disk drive cage to the chassis.
  4. 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.
  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.
  7. 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).
Installing an Internal 3.5-inch Hard Drive
  1. Follow the steps in Removing an Internal 3.5-inch Hard Drivehard driveremovingremovinghard drive to remove the hard drive cage and, if necessary, the existing hard drive.
  2. 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.
      note:
    If you are installing a second hard drive, use four of the extra standard 6-32 screws that are installed on the interior of the front bezel. The 6-32 screws are silver.
  3. Connect the power cable (1) and data cable (2) to the back of the hard drive.
      caution:
    Never crease or bend a SATA data cable tighter than a 30 mm (1.18 in) radius. A sharp bend can break the internal wires.
  4. 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).
  5. Attach the two screws that secure the hard disk drive cage to the chassis.
  6. If installing a new drive, connect the opposite end of the data cable to the appropriate system board connector.
      note:
    If your system has only one SATA hard drive, you must connect the hard drive data cable to the dark blue connector labeled SATA0 to avoid any hard drive performance problems. If you are adding a second hard drive, connect the data cable to the next available (unpopulated) SATA connector on the system board in the following order: SATA0, SATA1, SATA3, SATA2.
  7. Replace the computer access panel.
  8. Lock any security devices that were disengaged when the access panel was removed.
  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).
  2. Remove the computer access panel (Computer Access Panel).
  3. Remove the front bezel (Front Bezel).
  4. Disconnect the front USB cable from the yellow system board connector (F_AUDIO) and the I/O cable from the white system board connector (F_USB1).
  5. Stand the unit upright.
  6. Remove the silver T15 screw (1) that secures the panel to the chassis.
  7. Pull the panel (2) away from the unit while threading the wires between the drive cage and the baffle and through the hole in the front of the chassis.
To reinstall the panel, reverse the removal procedure.
Power Switch/LED Assembly
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Remove the front bezel (Front Bezel).
  4. Disconnect the cable from the black system board connector labeled F_PANEL.
  5. Remove the cable from the metal clamps on the side of the drive cage. This step may require a flat blade screwdriver to lift the clamps enough to remove the cable.
  6. To remove the power button assembly, perform the following steps simultaneously:
    1. On the right side of the assembly, press down on the top tab (1).
    2. Press in on the tab on the right side of the assembly (2).
    3. While pressing the two tabs, pull the assembly away from the chassis enough to loosen the tabs from their slots in the chassis.
  7. Pull the assembly away from the chassis while threading the wire through the hole in the front of the chassis.
  8. Remove the assembly from the chassis.
To reinstall the assembly, reverse the removal procedures. Be sure to route the cable through the metal clamps on the side of the drive cage.
Heatsink
You will need a screwdriver with a narrow shaft to loosen the heatsink screws.
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Unplug the fan cable from the system board (CPU FAN).
  4. Lift the silver latch that tightens the heatsink, and then pull the latch toward the heatsink to remove the metal hook from the tab on the backplate.
  5. Pull the latch up so the metal hook rests above the tab on the backplate, and then press the latch toward the heatsink to disengage the metal hook on the opposite side of the heatsink from the backplate.
  6. Lift the heatsink from the processor.
  7. Remove the heatsink from the processor.
When reinstalling the heatsink, make sure that its bottom has been cleaned with an alcohol wipe and fresh thermal grease has been applied to the top of the processor.
  caution:
Heatsink retaining screws should be tightened in diagonally opposite pairs (as in an X) to evenly seat the heatsink on the processor. This is especially important as the pins on the socket are very fragile and any damage to them may require replacing the system board.
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.
Processor
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Remove the heatsink (Heatsink).
  4. Rotate the locking lever to its full open position (1).
  5. Raise and rotate the microprocessor retainer to its fully open position (2).
  6. Carefully lift the processor from the socket (3).
      caution:
    Do NOT handle the pins in the processor socket. These pins are very fragile and handling them could cause irreparable damage. Once 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 the locking lever.
    If reusing the existing heatsink, go to step 3.
    If using a new heatsink, go to step 5.
  3. If reusing the existing heatsink, apply the thermal grease provided in the spares kit to the top of the processor.
  4. Clean the bottom of the heatsink with the provided alcohol pad and place it atop the processor.
  5. If using a new heatsink, remove the protective covering from the bottom of the heatsink and place it in position atop the processor.
  6. Secure the heatsink to the system board and system board tray with the four captive screws and attach the heatsink control cable to the system board.
      caution:
    Heatsink retaining screws should be tightened in diagonally opposite pairs (as in an X) to evenly seat the heatsink on the processor. This is especially important as the pins on the socket are very fragile and any damage to them may require replacing the system board.
  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.
Speaker
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Remove the front bezel (Front Bezel).
  4. Disconnect the wire from the white system board connector labeled SPEAKER.
      note:
    Note the routing of the speaker wire – behind the hard drive cage bracket, through the metal clamp on the chassis, through the metal clamp on the side of the second hard drive cage, and then down to the system board.
  5. From the outside of the chassis, remove the three silver T15 screws that secure the speaker to the chassis.
  6. Lift the speaker out of the chassis.
To replace the speaker, reverse the removal procedures.
When replacing the speaker, be sure to route the wire behind the hard drive cage bracket, through the metal clamp on the chassis, through the metal clamp on the side of the second hard drive cage, and then down to the system board.
Rear Chassis Fan
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Disconnect the fan control cable from the red system board connector labeled SYS_FAN1.
  4. From the outside, remove the four silver Phillips screws that secure the fan to the chassis.
  5. Lift the fan out of the chassis.
To install the fan assembly, reverse the removal procedure. Be sure to orient the air flow out of the unit.
Power Supply
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Disconnect all power cables from the drives and from the system board.
  4. Remove the four silver T15 screws that connect 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.
To install the power supply, reverse the removal procedure.
System Board
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
  3. Remove all expansion boards (Expansion Cards).
  4. Disconnect all cables connected to the system board, noting their location for reinstallation.
  5. Remove the heatsink (Heatsink).
  6. Remove the remaining eight screws that secure the system board to the chassis.
  7. Slide the system board toward the front of the computer to disengage the I/O panel from the rear of the chassis.
  8. Lift the system board out of the computer.
When reinstalling the system board, first insert the I/O panel back into the slots in the rear of the chassis, and then align the board with the chassis screw holes.
  note:
When replacing the system board, you must change the chassis serial number in the BIOS.
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. There is a risk of fire and burns if the battery is not handled properly. To reduce the risk of personal injury:
Do not attempt to recharge the battery.
Do not expose to temperatures higher than 60°C (140ºF).
Do not disassemble, crush, puncture, short external contacts, or dispose of in fire or water.
Replace the battery only with the HP spare designated for this product.
  caution:
Before replacing the battery, it is important to back up the computer CMOS settings. When the battery is removed or replaced, the CMOS settings will be cleared. Refer to Computer Setup (F10) Utility for information on backing up the CMOS settings.
Static electricity can damage the electronic components of the computer or optional equipment. Before beginning these procedures, ensure that you are discharged of static electricity by briefly touching a grounded metal object.
  note:
The lifetime of the lithium battery can be extended by plugging the computer into a live AC wall socket. The lithium battery is only used when the computer is NOT connected to AC power.
HP encourages customers to recycle used electronic hardware, HP original print cartridges, and rechargeable batteries. For more information about recycling programs, go to http://www.hp.com/recycle.
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer access panel (Computer Access Panel).
      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:
Type 1 Battery Holder
  1. Lift the battery out of its holder.
  2. Slide the replacement battery into position, positive side up.
  3. The battery holder 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.
Type 2 Battery Holder
  1. To release the battery from its holder, squeeze the metal clamp (1) that extends above one edge of the battery. When the battery pops up, lift it out.
  2. To insert the new battery, slide one edge of the replacement battery under the holder’s lip with the positive side up (2). Push the other edge down until the clamp snaps over the other edge of the battery.
  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.
Type 3 Battery Holder
  1. Pull back on the clip (1) that holds the battery in place, then remove the battery (2).
  2. Insert the new battery and position the clip back in place.
  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.

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