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HP Compaq dc7700 Business PC - Removal and Replacement Procedures -- Small Form Factor (SFF) 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.

Preparation for Disassembly

  1. Remove/disengage any security devices that prohibit opening the computer (Unlocking the Smart Cover Lock and 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.
    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.

Unlocking the Smart Cover Lock

If you have locked the Smart Cover Lock use Computer Setup to unlock the lock. Refer to the Desktop Management Guide on the Documentation and Diagnostics CD for more information about the Smart Cover Lock.
If you cannot access Computer Setup to unlock the cover you will need to remove the locking solenoid by using the Smart Cover FailSafe Key (Spare part number 166527-001 or 166527-002). Once the solenoid has been deactivated or removed the access panel can be removed.
The Smart Cover FailSafe Key will be needed in any of the following circumstances:
  • Power outage
  • Startup failure
  • Processor or power supply failure
  • Lost password
To open the computer cover with the Smart Cover Lock engaged:
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Using the Smart Cover FailSafe Key, remove the tamper-proof screw (1) that secures the Smart Cover Lock to the inside of the chassis.
  3. Push the metal arm that wraps around the air vent grid up and back (2) to free the Smart Cover Lock from the chassis.
  4. Remove the computer cover (Computer Cover).
To reattach the Smart Cover Lock:
  1. Install the Smart Cover Lock assembly on the inside of the rear panel with the metal arm (1) wrapped around the air vent grid on the back of the chassis.
  2. Use the supplied tamper-resistant screw (2) to secure the Smart Cover Lock to the chassis.

Hood Sensor

  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer cover (Computer Cover).
  3. Remove the special security clip (Security Clip) from the top corner of the power supply cage.
  4. Raise the power supply to its full upright position.
  5. Disconnect the hood sensor cable from the system board.
  6. Slide the hood sensor switch mounted on the power supply towards the outside of the computer (1) and lower it through the slot (2).
To install the hood sensor, reverse the removal procedure.

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.

Security Clip

A special clip is required to secure the computer from intrusion. This clip must be installed before installing the computer cover.

Installing a Cable Lock

The cable lock may be used to secure the computer access panel to the chassis and, at the same time, secure the computer to a fixed object.
Insert the cable lock in the location shown below.

Installing a Padlock

A padlock may be used by itself to secure the access panel to the computer chassis. A padlock may also be used with a security cable to secure the computer to a fixed object.

Computer Cover

  1. Prepare the computer for disassembly (Preparation for Disassembly).
      caution:
    Before removing the computer cover, ensure that the computer is turned off and that the power cord is disconnected from the electrical outlet.
  2. Press the buttons on the left and right sides of the computer (1).
  3. Slide the computer cover towards the front of the computer until it stops (2), then lift it up and off the chassis.
To install the computer cover, reverse the removal procedure.

Front Drive Bezels

  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer cover (Computer Cover).
  3. Remove the drive bezel by pushing the top tab on the right side of the larger front bezel as shown (1) and rotating the drive bezel away from the larger front bezel (2).
    note:
    The drive bezel will vary depending on the computer configuration.
  4. Install a bezel or a bezel blank by pushing the bezel into place.
There are three drive bezel inserts that are available.
Item
Description
1
Diskette drive bezel
2
Hard drive bezel
3
3.5” drive bezel

Cable Management

The Small Form Factor chassis is a very compact computer and proper routing of the internal cables is critical to the operation of the computer. 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 movable or rotating parts like the power supply and drive cage to prevent them from being cut or crimped when the component is lowered into its normal position.
  • When folding a flat ribbon cable, never fold to a sharp crease. Sharp creases may damage the wires.
  • Some flat ribbon cables come prefolded. 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 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.
Cable
To
Cable Designator
Power Supply
System board, 24-pin
P1
Power Supply
Diskette drive
P2
Power Supply
CPU power, 6-pin
P3
Power Supply
1st SATA Hard drive
P4
Power Supply
2nd SATA Hard drive
P5
Power Supply
Optical drive
P7
Cable
To
PCA Designator
Diskette drive
System board
P10, FLOPPY (Black)
1st SATA Hard drive
System board
P60, SATA 0 (Dark Blue)
1st ODD or 2nd Hard drive if no ODD present
System board
P61, SATA 1 (White)
2nd SATA Hard drive if ODD present
System board
P62, SATA 2 (Light blue)
Serial port A
System board
P54, COM A
Serial port B
System board
P52, COM B
Hood lock solenoid
System board
P124, HLCK
Heatsink fan
System board
P8, CPU FAN
Hood Sensor
System board
P125, HSENSE
Front power button/LED
System board
P5, Pb/LED
Front I/O USB
System board
P24, FRNT USB (Yellow)
Speaker
System board
P6, SPKR
Front audio
System board
P23, FRTNT AUD, (Blue)
Chassis fan
System board
P9, CH FAN

Memory

The dx7300 and dc7700 series computers with Intel-based processors come with double data rate 2 synchronous dynamic random access memory (DDR2-SDRAM) dual inline memory modules (DIMMs).

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 8 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 PC2-4300 533 MHz-compliant, 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 4 (DDR2/533 MHz and DDR2/667 MHz) and CAS latency 5 (DDR2/667 MHz and DDR2/800 MHz)
  • contain the mandatory JEDEC SPD information
In addition, the computer supports:
  • 256Mbit, 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 start 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 XMM1, XMM2, XMM3, and XMM4. Sockets XMM1 and XMM2 operate in memory channel A. Sockets XMM3 and XMM4 operate in memory channel B.
Figure : DIMM Socket Locations
Item
Description
Socket Color
1
DIMM socket XMM1, Channel A
Black
2
DIMM socket XMM2, Channel A
White
3
DIMM socket XMM3, Channel B
White
4
DIMM socket XMM4, Channel B
White
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 256MB DIMMs and Channel B is populated with one 512MB 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. For example, if you are populating the sockets with one 1GB DIMM, two 512MB DIMMs, and one 256MB DIMM, one channel should be populated with the 1GB DIMM and one 256MB DIMM and the other channel should be populated with the two 512MB DIMMs. With this configuration, 2 GB will run as dual channel and 256 MB will run as single channel.
  • In any mode, the maximum operational speed is determined by the slowest DIMM in the system.

Replacing Memory

  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. .
When handling a memory module, be careful not to touch any of the contacts. Doing so may damage the module.
  1. If you have locked the Smart Cover Lock, use Computer Setup to unlock the lock (Unlocking the Smart Cover Lock).
  2. Prepare the computer for disassembly (Preparation for Disassembly).
  3. Remove the computer cover (Computer Cover).
      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).
    note:
    A memory module can be installed in only one way. Match the notch on the module with the tab on the memory socket.
  5. Push the module down into the socket, ensuring that the module is fully inserted and properly seated. Make sure the latches are in the closed position (3).
  6. Repeat steps 4 and 5 for any additional modules that you want to install.
note:
The computer automatically recognizes the additional memory when the computer is turned on.
To reassemble the computer, reverse the removal procedure.
note:
If you normally lock the Smart Cover Lock, use Computer Setup to relock the lock and enable the Smart Cover Sensor.

Expansion Card Retainer

  1. If you have locked the Smart Cover Lock, restart the computer and enter Computer Setup to unlock the lock.
  2. Turn off the computer properly through the operating system, then turn off any external devices.
  3. Disconnect the power cord from the power outlet and disconnect any external devices.
  4. Remove the computer cover (Computer Cover).
  5. Release the slot cover retention latch that secures the PCI slot covers by lifting the green tab on the latch and rotating the latch to the full open position (1).
  6. Remove the single screw that keeps the card retainer in place (2) and slide the retainer to the left to remove it from the chassis (3).
To install the card retainer, reverse the removal procedure.

PCI Expansion Card

  1. If you have locked the Smart Cover Lock, restart the computer and enter Computer Setup to unlock the lock.
  2. Turn off the computer properly through the operating system, then turn off any external devices.
  3. Disconnect the power cord from the power outlet and disconnect any external devices.
  4. Remove the computer cover (Computer Cover).
  5. Identify the slot into which you want to insert the expansion card.
  6. Release the slot cover retention latch that secures the PCI slot covers by lifting the green tab on the latch and rotating the latch to the full open position (1).
  7. Remove the slot cover by sliding it up and out of the computer (2).
  8. Install the expansion card by sliding the card under the slot cover retention latch then pressing the card down into the slot on the system board.
    note:
    Be sure not to scrape other components in the chassis when installing an expansion card.
  9. Rotate the slot cover retention latch back in place to secure the expansion card.
note:
When you install an expansion card, make sure the metal bracket on the card slides into the slot on the back of the computer then press down firmly on the card so that the whole connector seats properly in the expansion card slot.
  caution:
All expansion card slots on the rear of the computer must contain either an expansion card or slot cover for proper cooling of internal components during operation.

PCI Express Expansion Card

To remove a PCI Express expansion card:
  1. If you have locked the Smart Cover Lock, restart the computer and enter Computer Setup to unlock the lock.
  2. Turn off the computer properly through the operating system, then turn off any external devices.
  3. Disconnect the power cord from the power outlet and disconnect any external devices.
  4. Remove the computer cover (Computer Cover).
  5. Release the slot cover retention latch on the back of the computer that secures the PCI slot covers by lifting the green tab on the latch and rotating the latch to the open position.
  6. Pull the retention arm on the back of the PCI Express expansion socket away from the card (on x16 card socket only) and carefully rock the card back and forth until the connectors pull free from the socket. Pull the expansion card straight up from the socket then away from the inside of the chassis. Be sure not to scrape the card against the other components.
  7. If you are not installing a new expansion card, install an expansion slot cover to close the open slot.
  8. Rotate the slot cover retention latch back in place to secure the expansion cards and expansion slot covers.
  caution:
All expansion card slots on the rear of the computer must contain either an expansion card or slot cover for proper cooling of internal components during operation.

PCI Riser Card Assembly and Backwall

  1. If you have locked the Smart Cover Lock, use Computer Setup to unlock the lock (Unlocking the Smart Cover Lock).
  2. Prepare the computer for disassembly (Preparation for Disassembly).
  3. Remove the computer cover (Computer Cover).
  4. Remove all PCI and PCI Express expansion cards from the PCI expansion slots (PCI Expansion Card and PCI Express Expansion Card).
  5. Rotate the optical and diskette drive cage to its upright position.
  6. Remove the security clip (Security Clip), rotate the power supply to its full upright position (1), then lift the power supply straight up and out of the chassis (2).
  7. Remove the SmartCover lock from the backwall of the chassis using the special security wrench and disconnect its cable from the system board (Unlocking the Smart Cover Lock).
  8. Disconnect the data and power cables from the system board.
  9. Disconnect the “Serial A” cable from the system board, remove the two screws that secure the serial connector to the backwall, then remove the serial connector.
  10. Remove the fan shroud by lifting it up and out (Fan Shroud).
  11. Remove the chassis fan (Chassis Fan).
  12. Remove the long mounting screw that secures the system board tray to the chassis.
  13. Slide the system board tray assembly towards the front of the chassis about 6 cm (1/4 inch) and lift the system board up and out of the chassis.
  14. Remove the three screws that secure the backwall assembly to the chassis (1), then slide the backwall assembly a few millimeters/inches toward the space vacated by the power supply and lift out (2).
  15. Slide the new backwall onto the rear chassis (1). Secure it with the three screws removed from the old backwall (2).
  16. Install the serial connector into the new backwall using the two screws that were removed from the serial connector in a previous step. Reconnect the “Serial A” cable to the system board.
  17. Install the system board tray assembly. Be sure the keyhole slot on the system board sits properly over the locking pins. When the system board is in position, replace the long mounting screw to secure the system board to the chassis.
  18. Install the chassis fan and connect the control cable to the system board.
  19. Reconnect all power and data cables to the system board. Be sure to use proper cable handling and placement precautions.
  20. Install the power supply. Rotate it to its normal operating position. Be sure to use proper cable handling and placement precautions.
  21. Install the full-height PCI expansion card in the available slot in the new PCI riser card cage assembly.
  22. Install the new PCI riser card cage assembly on the new backwall by aligning the cage with the guide rails on the backwall. Press down firmly on the cage to secure it in place on the backwall. Be sure the riser card in the cage is properly seated in the PCI expansion slot on the system board.
  23. Rotate the drive cage back down to its normal position. Be sure to use proper cable handling and placement precautions.
      caution:
    Cables are very sensitive. Overbending, creasing, or pinching can damage cables.
  24. Replace the fan shroud on top of the fan.
  25. Replace the computer cover.

Drives

A Torx T-15 screwdriver is needed to remove and install the guide screws on a drive.
  caution:
Make sure personal files on the hard drive are backed up to an external storage device before removing the hard drive. Failure to do so will result in data loss. After replacing the primary hard drive, you will need to run the Restore Plus! CD to load the HP factory-installed files.

Drive Positions

Drive Positions
Item
Description
1
3.5-inch, internal, standard hard drive bay
2
5.25-inch drive bay for optional drives
3
13.5-inch drive bay (1.44-MB diskette drive shown)
1A 3.5-inch diskette drive, hard drive, or media card reader may be installed in this bay but the correct bezel must be installed to ensure proper air flow.
To verify the type and size of the storage device installed in the computer, run Computer Setup.

Optical Drive

  caution:
All removable media should be taken out of the drives before removing the drive from the computer.
note:
An optical drive is a CD-ROM, CD-R/RW, DVD-ROM, DVD+R/RW, or CD-RW/DVD Combo drive.
  1. If you have locked the Smart Cover Lock, use Computer Setup to unlock the lock (Unlocking the Smart Cover Lock).
  2. Prepare the computer for disassembly (Preparation for Disassembly).
  3. Remove the computer cover (Computer Cover).
  4. Rotate the drive cage to its upright position by pulling on the green-tabbed lip.
  5. Disconnect the power and data cables from the rear of the optical drive.
  6. Rotate the drive cage down to its normal position before trying to remove the drive.
  7. Press the green drive retainer latch and slide the drive forward and lift it from the drive cage.
  8. When replacing the drive, transfer the four screws from the old drive to the new one. The screws take the place of drive rails.
      caution:
    Use only 5-mm long screws as guide screws. Longer screws can damage the internal components of the drive.

External 3.5-inch Drive

  1. If you have locked the Smart Cover Lock, use Computer Setup to unlock the lock (Unlocking the Smart Cover Lock).
  2. Prepare the computer for disassembly (Preparation for Disassembly).
  3. Remove the computer cover (Computer Cover).
  4. Remove the optical drive (Optical Drive).
  5. Rotate the drive cage to its upright position by pulling on the green-tabbed lip.
  6. Disconnect the signal (1) and power (2) cables from the drive. The other end of the cables should remain connected to the system board. (Diskette drive is shown.)
  7. Rotate the drive cage down to its normal position before trying to remove the drive.
  8. Press the green drive retention latch (1) located on the side of the diskette drive to disengage the drive from the drive cage and slide the diskette drive forward approximately 6 mm (1/4 inch) (2).
  9. Lift the rear of the drive up so that the rear guide screws clear the top of the drive cage (1). As the drive rises it automatically slides forward until it is free from the drive cage (2).
To replace the drive, reverse the removal procedure making sure you rotate the rear of the drive down, pivoting on the front screws.
note:
When replacing the drive, transfer the four metric screws from the old drive to the new one. The screws take the place of drive rails.

Primary Hard Drive

A Torx T-15 screwdriver is needed to remove and install the guide screws on a hard drive.
  caution:
Make sure personal files on the hard drive are backed up to an external storage device before removing the hard drive. Failure to do so will result in data loss. After replacing the primary hard drive, you will need to run the Restore Plus! CD to load the HP factory-installed files.
  caution:
To prevent loss of work and damage to the computer or drive:
If you are inserting or removing a hard drive, shut down the operating system properly, then turn off the computer. Do not remove a hard 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.
  1. If you have locked the Smart Cover Lock, use Computer Setup to unlock the lock (Unlocking the Smart Cover Lock).
  2. Prepare the computer for disassembly (Preparation for Disassembly).
  3. Remove the computer cover (Computer Cover).
  4. Rotate the drive cage to its upright position by pulling on the green-tabbed lip.
    note:
    It is not necessary to remove the drives from the drive cage.
  5. Remove the security clip that secures the backwall to the power supply.
  6. Rotate the power supply to its full upright position.
  7. Disconnect the power and data cables from the back of the hard drive.
  8. Pull the tab that locks the drive in place away from the drive (1), slide the hard drive toward the front of the computer, then lift it up and out of the bay (2).
To install a hard drive, reverse the above procedure.
note:
The replacement hard drive kit includes several data cables. Make sure to use the cable that is exactly the same as the factory-installed cable.
If the system has only one SATA hard drive, the data cable must be connected to the dark blue connector labeled SATA0 first to avoid any hard drive performance problems.
When replacing the hard drive, transfer the four screws from the old drive to the new one. The screws take the place of drive rails. You will need a Torx T-15 screwdriver to remove and re-install the guide screws. HP has provided four extra 6-32 standard guide screws on the front of the chassis, under the computer cover. The 6-32 standard guide screws are silver and are used only for the hard drive.
If you replaced the primary hard drive, insert the Restore Plus! CD to restore the operating system, software drivers, and any software applications that were preinstalled on the computer. Follow the instructions in the guide included with the Restore Plus! CD. When the restore process has completed, reinstall any personal files that you backed up before replacing the hard drive.

Fan Shroud

  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer cover (Computer Cover).
  3. Lift up on the fan shroud (1), rotate the rear of the shroud up (2) (pivoting on its top front lip) and out of the chassis (3).
When replacing the shroud, make sure that it does not get caught on the wires from either the fan or the speaker.

Front I/O Devices

  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer cover (Computer Cover).
  3. Remove the two screws that secure the front I/O device to the chassis (1).
  4. Rotate the drive cage to its full upright position.
  5. Disconnect the front I/O cable from the system board.
  6. Push the front I/O device into the chassis (2) and snake the cable through the tunnel (3) to remove the device from the chassis.
To reinstall the front I/O device, reverse the removal procedure.

Heatsink

  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer cover (Computer Cover).
  3. Remove the fan shroud (Fan Shroud).
  4. Disconnect the fan control cable from the system board.
  5. Loosen the four captive screws that secure the heatsink to the system board tray.
      caution:
    Heatsink retaining screws should be removed in diagonally opposite pairs (as in an X) to even the downward forces 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.
  6. Lift the heatsink from atop the processor and set it on its side to keep from contaminating the work area with thermal grease.
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.
Failure to install the fan shroud may cause the computer to overheat.

Processor

  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer cover (Computer Cover).
  3. Remove the fan shroud (Fan Shroud).
  4. Disconnect the heatsink control cable from the system board and remove the heatsink (Heatsink).
  5. Rotate the locking lever to its full open position (1).
  6. Raise and rotate the microprocessor retainer to its fully 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.
    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.
      caution:
    Before reinstalling the heatsink you must clean the top of the processor and the bottom of the heatsink with an alcohol pad supplied in the spares kit. After the alcohol has evaporated, apply thermal grease to the top of the processor from the syringe supplied 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 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 the HP Software and Drivers page.

Speaker

  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer cover (Computer Cover).
  3. Remove the fan shroud (Fan Shroud).
  4. Remove any memory modules that might interfere with the screwdriver used for removing the speaker.
  5. Disconnect the speaker wire from the system board.
  6. Remove the two screws that secure the speaker to the chassis (1).
  7. Rotate the top of the speaker back to clear the lip on the top of the chassis, then lift the speaker up and out of the chassis (2).
To install the speaker, reverse the removal procedures.

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.
  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer cover (Computer Cover).
  3. Remove the security clip.
  4. Rotate the drive cage up and disconnect the power cables from all of the drives.
  5. Disconnect the power cables from the system board.
  6. Release the power supply cable from the cable retaining clips on the bottom of the chassis under the drive cage.
  7. Disconnect the hood sensor from the system board and remove the sensor from the power supply if required (Hood Sensor).
  8. Rotate the power supply to its full upright position (1), then lift the power supply straight up and out of the chassis (2).
To install the power supply, reverse the removal procedure.
  caution:
When installing the power supply cables, make sure they are properly positioned so they are not cut by the drive cage and are not pinched by the rotating power supply.

Chassis Fan

  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer cover (Computer Cover).
  3. Remove the fan shroud (Fan Shroud).
  4. Disconnect the chassis fan cable from the system board.
  5. Remove the four screws that secure the fan to the chassis, then remove the fan from the chassis.
To install the chassis fan, reverse the removal procedure. Be sure to orient the air flow into the unit. The molded grille on the chassis fan should face the inside of the chassis.

System Board

  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer cover (Computer Cover).
  3. Remove all PCI and PCI Express expansion boards (PCI Expansion Card and PCI Express Expansion Card).
  4. Remove the fan shroud from the chassis (Fan Shroud).
  5. Remove the chassis fan from the chassis (Chassis Fan).
  6. Rotate the drive cage to its full upright position.
  7. Remove the security clip (Security Clip) and rotate the power supply to its full upright position.
  8. Disconnect all data and power cables from the system board.
  9. Disconnect the serial port from the system board.
  10. Disconnect the balance of the cables from the system board.
  11. Remove the long mounting screw that secures the system board tray to the chassis.
  12. Slide the system board tray assembly towards the front of the chassis, about 6 mm (1/4 inch) and lift the system board up and out of the chassis.
  13. Remove the heatsink from the system board and the system board tray (Heatsink).
To install the system board, reverse the removal procedure.
note:
The heatsink should be installed on the system board before the system board is reinstalled in the chassis.
  caution:
Before reinstalling the heatsink you must clean the top of the processor and the bottom of the heatsink with an alcohol pad supplied in the spares kit. After the alcohol has evaporated, apply thermal grease to the top of the processor from the syringe supplied in the spares kit.
note:
When reinstalling the system board it is important to secure the system board and tray to the chassis with the long retaining screw before performing any subsequent steps.
  caution:
When reconnecting the cables it is important that they be positioned so they do not interfere with the rotation of the drive cage or power supply.

Drive Clutch Components

  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer cover (Computer Cover).
  3. Remove the optical drive and any other drive in the rotating drive cage (Optical Drive and External 3.5-inch Drive).
  4. Remove the chassis fan (Chassis Fan).
  5. Remove the system board (System Board).
  6. Remove the five screws that secure the clutch base to the chassis.
  7. Hold the drive cage in the up position while removing the clutch base from the floor of the chassis.
      caution:
    When moving the clutch base be careful not to damage the wires that are threaded through it.
  8. Hold the drive cage in the upright position while removing the two screws that secure the clutch finger assembly to the drive cage.
      caution:
    The clutch finger assembly doe not have to be removed to remove the power switch.
To replace the drive clutch components, reverse the removal procedure.

Power Switch Assembly

  1. Prepare the computer for disassembly (Preparation for Disassembly).
  2. Remove the computer cover (Computer Cover).
  3. Remove all drives from the rotating drive cage (Optical Drive and External 3.5-inch Drive).
  4. Remove the chassis fan (Chassis Fan).
  5. Remove the system board (System Board).
  6. Remove the drive clutch base (Drive Clutch Components).
  7. Disconnect the power switch/LED cable from the system board.
  8. Squeeze the switch holder retaining clips together at the front of the chassis (1) and push the switch assembly out of the chassis (2). Push the two LEDs out of the chassis (3).
  9. If necessary, the LED holders may also be removed by squeezing the clips and pushing them out of the front of the chassis.
To install the power switch and LEDs, reverse the removal procedure.

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 140°F (60°C).
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 the Computer Setup (F10) Utility Guide for information on backing up the CMOS settings.
note:
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.
  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 computer access panel (Computer Cover).
    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, 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.

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