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HP Compaq dx7500 Microtower PC - Removal and Replacement Procedures for 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 upper left side of the computer. Keep these numbers available for use when contacting customer service for assistance.
Figure :
  note:
Bezel appearance may vary.
Preparation for Disassembly
  1. Close any open software applications.
  2. Exit the operating system.
  3. Remove any diskette or compact disc from the computer.
  4. Turn off the computer and any peripheral devices that are connected to it.
      caution:
    Turn off the computer before disconnecting any cables.
      caution:
    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.
  5. Disconnect the power cord from the electrical outlet and then from the computer.
  6. Disconnect all peripheral device cables from the computer.
      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.
Access Panel
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the screw (1) that secures the access panel to the computer chassis.
  3. Slide the access panel back (2) about 1.3 cm (1/2 inch), then lift it off the unit.
      note:
    You may want to lay the computer on its side to install internal parts. Be sure the side with the access panel is facing up.
    Figure :
To replace the access panel, reverse the removal steps.
Front Bezel
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the access panel (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 :
  note:
The appearance of the front bezel may vary.
To reinstall the front bezel, reverse the removal procedure.
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. Follow the instructions described in Front Bezel.
  2. Press the two retaining tabs towards the outer left edge of the bezel (1) and pull the bezel blank inwards to remove it (2).
    Figure :
Memory
The computer comes with double data rate 2 synchronous dynamic random access memory (DDR2-SDRAM) dual inline memory modules (DIMMs).
  caution:
DDR and DDR2 memory modules are not interchangeable.
DDR2-SDRAM 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 16-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 PC2-6400 800 MHz-compliant
  • 1.8 volt DDR2-SDRAM DIMMs
The DDR2-SDRAM DIMMs must also:
  • support 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, 1Gbit, and 2Gbit 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.
Populating DIMM Sockets
There are four DIMM sockets on the system board, with two sockets per channel. The sockets are labeled DIMM1, DIMM2, DIMM3, and DIMM4. Sockets DIMM1 and DIMM2 operate in memory channel A. Sockets DIMM3 and DIMM4 operate in memory channel B.
Figure :
DIMM Socket Locations
Item
Description
Socket Color
1
DIMM1 socket, Channel A (populate first)
Blue
2
DIMM2 socket, Channel A
Black
3
DIMM3 socket, Channel B (populate second)
Blue
4
DIMM4 socket, Channel B
Black
  note:
A DIMM must occupy the DIMM1 socket.
The system will automatically operate in single channel mode, dual channel mode, or flex mode, depending on how the DIMMs are installed.
  • The system will operate in single channel mode if the DIMM sockets are populated in one channel only.
  • The system will operate in a higher-performing dual channel mode if the total memory capacity of the DIMMs in Channel A is equal to the total memory capacity of the DIMMs in Channel B. The technology and device width can vary between the channels. For example, if Channel A is populated with two 512-MB DIMMs and Channel B is populated with one 1-GB DIMM, the system will operate in dual channel mode.
  • The system will operate in flex mode if the total memory capacity of the DIMMs in Channel A is not equal to the total memory capacity of the DIMMs in Channel B. In flex mode, the channel populated with the least amount of memory describes the total amount of memory assigned to dual channel and the remainder is assigned to single channel. For optimal speed, the channels should be balanced so that the largest amount of memory is spread between the two channels. If one channel will have more memory than the other, the larger amount should be assigned to Channel A. For example, if you are populating the sockets with one 1-GB DIMM, and three 512-MB DIMMs, Channel A should be populated with the 1-GB DIMM and one 512-MB DIMM, and Channel B should be populated with the two 512-MB DIMMs. With this configuration, 2-GB will run as dual channel and 512-MB will run as single channel.
  • In any mode, the maximum operational speed is determined by the slowest DIMM in the system.
Installing Memory Modules
  caution:
You must disconnect the power cord and wait approximately 30 seconds for the power to drain before adding or removing memory modules. Regardless of the power-on state, voltage is always supplied to the memory modules as long as the computer is plugged into an active AC outlet. Adding or removing memory modules while voltage is present may cause irreparable damage to the memory modules or system board.
The memory module sockets have gold-plated metal contacts. When upgrading the memory, it is important to use memory modules with gold-plated 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.
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 access panel (Access Panel).
  3. Locate the memory module sockets on the system board.
      warning:
    To reduce risk of personal injury from hot surfaces, allow the internal system components to cool before touching.
  4. Open both latches of the memory module socket (1), and insert the memory module into the socket (2).
    Figure :
      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 DIMM1 socket. Always populate the blue sockets before the black sockets in each channel.
    In order to create a dual-channel memory configuration, the memory capacity of Channel A must equal the memory capacity of Channel B. Refer to Populating DIMM Sockets for more information.
  5. 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).
  6. Repeat steps 4 and 5 to install any additional modules.
  7. Replace the computer access panel.
  8. Reconnect the power cord and any external devices, then turn on the computer. The computer should automatically recognize the additional memory when you turn on the computer.
  9. Lock any security devices that were disengaged when the access panel was removed.
Expansion Cards
The computer has three PCI Express x1 expansion slots and one PCI Express x16 expansion slot. The expansion slots accommodate full-height or half-height expansion cards.
Figure :
Expansion Slot Locations
Item
Description
1
PCI Express x1 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 access panel (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.
      Figure :
    2. If you are removing a PCI Express x1 card, hold the card at each end and carefully rock it back and forth until the connectors pull free from the socket. Be sure not to scrape the card against the other components.
      Figure :
    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.
      Figure :
  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.
    Figure :
      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.
    Figure :
  10. Connect external cables to the installed card, if needed. Connect internal cables to the system board, if needed.
  11. Replace the computer access panel.
  12. Reconnect the power cord and any external devices, then turn on the computer.
  13. Lock any security devices that were disengaged when the access panel was removed.
  14. Reconfigure the computer, if necessary. Refer to the Computer Setup (F10) Utility Guide for instructions on using Computer Setup.
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.
  • Some flat ribbon cables come prefolded. Never change the folds on these cables.
  • 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 cable from the P1 connector 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.
Connector Name
Connector Color
Description
ATXPOWER
White
Power supply, 24-pin
ATX_CPU
White
Power supply, 4-pin
FLOPPY
Black
Diskette drive
CHASSIS_FAN1
Brown
Chassis fan
CPU FAN
White
Heatsink fan
F_PANEL
Black
Front power button/LED
F_USB1
White
Front I/O USB cable
F_AUDIO
Yellow
Front I/O audio
SPEAKER
White
Internal speaker
F_1394
Red
Serial port
F_USB2
Black
Media card reader
SATA0
dark blue
Primary hard drive
SATA1
white
Primary optical drive
SATA4
red
Second hard drive
SATA5
black
Second optical drive
Drives
The computer supports up to five drives that may be installed in various configurations.
This section describes the procedure for replacing or upgrading the storage drives. A Torx T-15 screwdriver is needed to remove and install the guide screws on a drive.
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
Installing Additional 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.
  • Connect a second SATA optical drive to the black SATA5 connector.
  • Connect a second SATA hard drive to the red SATA4 connector.
  • 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 M3 metric guide screws (1) are black. The HP-supplied 6-32 standard screws (2) are silver.
Figure :
  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.
Figure :
System Board Drive Connections
No.
System Board Connector
System Board Label
Color
1
Media Card Reader
F_USB2
white
2
SATA4
SATA4
red
3
SATA5
SATA5
black
4
SATA1
SATA1
white
5
SATA0
SATA0
dark blue
6
Diskette Drive
FLOPPY
black
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 access panel (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.
    Figure :
  5. Remove the two screws that secure the drive to the drive cage (1), then slide the drive out of the front of the chassis (2).
    Figure :
  note:
To install an optical drive, refer to Installing an Optical Drive into the 5.25-inch Drive Bay.
Installing an Optical Drive into the 5.25-inch Drive Bay
To install an optional 5.25-inch optical drive:
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the access panel (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.
  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 screw holes on the drive are aligned with the screw holes on the drive cage and install the two M3 metric retainer screws (2) as shown in the following illustration.
      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. Refer to Installing Additional Drives for an illustration of the retainer screws location.
    Figure :
  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 black system board connector labeled SATA5.
  9. Connect the power cable (1) and data cable (2) to the rear of the optical drive.
    Figure :
  10. Replace the front bezel and access panel.
  11. Reconnect the power cord and turn on the computer.
  12. 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 access panel (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.
      Figure :
    2. If you are removing a media card reader, disconnect the USB cable from the system board.
      Figure :
  5. Remove the two retainer screws that secure the drive to the bay (1) then slide the drive forward and out of the bay (2).
    Figure :
  note:
To install an external 3.5-inch drive, refer to Installing a Drive into the 3.5-inch External Drive Bay.
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 access panel (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.
  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 screw holes on the drive are aligned with the screw holes on the drive cage and install the two 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. Refer to Installing Additional Drives for an illustration of the retainer screws location.
    Figure :
  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. Reconnect the power cord and turn on the computer.
  11. 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 access panel (Access Panel).
  3. Remove the two screws that secure the hard drive cage to the chassis.
    Figure :
  4. Push down the latch on the side of the hard drive cage (1), then slide the hard drive cage away from the bottom of the chassis (2) as shown below.
    Figure :
  5. Lift the hard drive cage out of the chassis.
    Figure :
  6. Disconnect the power cable (1) and data cable (2) from the back of the hard drive.
    Figure :
  7. Remove the four screws that secure the hard disk drive to the hard drive cage (1), then slide the hard disk drive out of the hard drive cage (2).
    Figure :
  note:
To install an internal 3.5-inch hard drive, refer to Installing an Internal 3.5-inch Hard Drive.
Installing an Internal 3.5-inch Hard Drive
  1. Follow the steps in Removing an Internal 3.5-inch Hard Drive to remove the hard drive cage and, if necessary, the existing hard drive.
  2. Slide the new drive into the hard 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 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. Refer to Installing Additional Drives for an illustration of the retainer screws location.
    Figure :
  3. Connect the power cable (1) and data cable (2) to the back of the hard drive.
    Figure :
      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 drive cage into the chassis (1), then slide it down toward the bottom of the chassis until it locks into place (2).
    Figure :
  5. Attach the two screws that secure the hard drive cage to the chassis.
    Figure :
  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 red connector labeled SATA4.
  7. Replace the computer access panel.
  8. Reconnect the power cord and any external devices, then turn on the computer.
  9. 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 I/O and USB Panel Housing Assembly
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the access panel (Access Panel)
  3. Lay the computer on its side with the front facing toward you.
  4. Remove the front bezel (Front Bezel).
  5. Unplug the four cables that connect the assembly to the system board.
  6. Remove the screw (1) that secures the housing to the chassis, slide the housing up (2), and then pull the assembly away from the chassis while guiding the cables through the hole in the chassis.
    To install the housing assembly, reverse the removal procedures.
Power Switch/LED Assembly
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the access panel (Access Panel).
  3. Lay the computer on its side with the front facing toward you.
  4. Remove the front bezel (Front Bezel).
  5. Remove the optical drive (Removing an Optical Drive).
  6. Disconnect the braided cables from the system board.
  7. Remove the cable from the clips in the optical drive cage.
  8. Press the tab on the right side of the switch holder (1) to disengage it from the chassis, rotate the switch to the left (2), and then pull it to the right and away from the chassis while guiding the wires through the hole in the chassis.
To install the power switch/LED assembly, reverse the removal procedures.
Speaker
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the access panel (Access Panel).
  3. Lay the computer on its side with the front facing toward you.
  4. Remove the front bezel (Front Bezel).
  5. Disconnect the speaker cable from the system board.
  6. Remove the three screws that secure the speaker to the inside of the chassis, and then lift it up and out of the chassis while threading the cable through hard drive cage bracket.
To install the speaker, reverse the removal procedure.
Be sure to route the cable back through the hard drive cage bracket and the clip on the side of the optical drive cage.
System Fan
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the access panel (Access Panel).
  3. Lay the computer on its side with the rear facing toward you.
  4. Disconnect the cable that connects the system fan to the system board.
  5. Remove the four Phillips screws that secure the fan to the chassis, rotate the top of the fan forward, and then remove the fan from the chassis.
To install the fan, reverse the removal procedures.
Heatsink assembly
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the access panel (Access Panel).
  3. Lay the computer on its side with the rear facing toward you.
  4. Disconnect the heatsink fan control cable from the system board.
  5. Loosen the four captive screws that secure the heatsink to the system board.
  6. Lift the heatsink from the processor and set it on its side to keep from contaminating the work area with thermal grease.
  caution:
Heatsink retaining screws should be tightened in diagonally opposite pairs (as in an X) to evenly seat the heatsink to 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.
When reinstalling an existing 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. New heatsinks come from the factory with fresh thermal grease already applied.
Processor
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the access panel (Access Panel).
  3. Lay the computer on its side with the rear facing toward you.
  4. Disconnect the heatsink control cable from the system board and remove the heatsink Heatsink assembly).
  5. Rotate the locking lever to its full open position (1).
  6. Raise and rotate the microprocessor retainer to its full open position (2)
  7. 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.
      caution:
    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 6.
  3. If reusing the existing heatsink, clean the bottom of the heatsink with the alcohol pad provided in the spares kit.
  4. Apply the thermal grease provided in the spares kit to the top of the processor and install the heatsink atop the processor.
  5. Go to step 7.
  6. If using a new heatsink, remove the protective covering from the bottom of the heatsink and place it in position atop the processor.
  7. Secure the heatsink to the system board and system board tray with the 4 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 ROM BIOS can be found on the HP Software and Drivers page
Power Supply
  warning:
Voltage is always present on the system board when the computer is plugged into an active AC outlet. To avoid possible personal injury and damage to the equipment the power cord should be disconnected from the computer and/or the AC outlet before opening the computer.
  note:
When installing a new power supply, be sure to set the red switch to the setting (230 V or 115 V) appropriate for the country in which the computer is used. Spare power supplies normally arrive set for 230 V.
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the access panel (Access Panel).
  3. Lay the computer on its side with the rear facing toward you.
  4. Disconnect all power cables from the mass storage devices and from the system board.
  5. Remove the four screws that secure the power supply to the chassis.
  6. Press the release latch on the chassis base, and then lift up the rear of the power supply to disengage it from the chassis.
  7. Slide the power supply toward the front/bottom of the computer, then lift the power supply out of the computer.
To install the power supply, reverse the removal procedure.
System Board
When replacing the system board, be sure that the following components are removed from the defective system board and installed on the replacement system board:
  • Memory modules
  • Processor
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the access panel (Access Panel).
  3. Lay the computer on its side with the rear facing toward you.
  4. Remove the front bezel (Front Bezel).
  5. Remove an expansion cards (Expansion Cards).
  6. Disconnect the power, and data cables from the back of all installed drives.
  7. Disconnect all cables from the system board.
  8. Remove the eight screws that secure the system board to the chassis.
  9. Slide the system board toward the front of the chassis, and then lift it up and out of the chassis.
      note:
    The system board in the computer may look slightly different from the one shown here.
To install the system board, reverse the removal procedure.
  note:
When replacing the system board, you must also change the chassis serial number in the BIOS.
  note:
After installing a new 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 ROM BIOS can be found on the HP Software and Drivers page.
Battery
The battery that comes with your computer provides power to the real-time clock and has a lifetime of about three years. When replacing the battery, use a battery equivalent to the battery originally installed on the computer. The computer comes with a 3-volt lithium coin cell battery.
  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.
  warning:
This 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 (140°F)
  • Do not disassemble, crush, puncture, short external contacts, or dispose of in fire or water.
  • Replace the battery only with the HP/Compaq 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 the Troubleshooting Guide for information on backing up the CMOS settings.
  note:
Batteries, battery packs, and accumulators should not be disposed of together with the general household waste. In order to forward them to recycling or proper disposal, please use the public collection system or return them to HP, its authorized partners, or its agents.
  caution:
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.
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the access panel (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.
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, your passwords, and any special system setups, using Computer Setup. Refer to the Computer Setup (F10) Utility Guide.
Type 2 Battery Holder
  1. To release the battery from its holder, squeeze the metal clamp that extends above one edge of the battery. When the battery pops up, lift it out (1).
  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, your passwords, and any special system setups, using Computer Setup. Refer to the Computer Setup (F10) Utility Guide.
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, your passwords, and any special system setups, using Computer Setup. Refer to the Computer Setup (F10) Utility Guide.
Installing a Security Lock
The security locks displayed below and on the following pages can be used to secure the computer.
Cable Lock
Figure :
Padlock
Figure :
HP Business PC Security Lock
  1. Fasten the security cable by looping it around a stationary object.
    Figure :
  2. Thread the keyboard and mouse cables through the lock.
    Figure :
  3. Screw the lock to the chassis using the screw provided.
    Figure :
  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 :

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