HP Compaq dc7900 Small Form Factor PC - Removal and Replacement Procedures for 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.

Not all features listed in this guide are available on all computers.

Preparation for Disassembly

See Identifying the Chassis, Routine Care, and Disassembly Preparation for initial safety procedures.

• • • 1. During disassembly, label each cable as you remove it, noting its position and routing. Keep all screws with the units removed.

      2. 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

The Smart Cover Lock is an optional feature included on some models only.

The Smart Cover Lock is a software-controllable cover lock, controlled by the setup password. This lock prevents unauthorized access to the internal components. The computer ships with the Smart Cover Lock in the unlocked position. For more information about locking the Smart Cover Lock, refer to the Desktop Management Guide .

Smart Cover FailSafe Key

If you enable the Smart Cover Lock and cannot enter your password to disable the lock, you will need a Smart Cover FailSafe Key to open the computer cover. You will need the key to access the internal computer components in any of the following circumstances:

• • Power outage

  • Startup failure

  • PC component (for example, processor or power supply) failure

  • Forgotten password

The Smart Cover FailSafe Key is a specialized tool available from HP. Be prepared; order this key before you need it.

To obtain a FailSafe Key:

• • Contact an authorized HP reseller or service provider. Order PN 166527-001 for the wrench-style key or PN 166527-002 for the screwdriver bit key.

  • Refer to the HP Web site ( http://www.hp.com ) for ordering information.

  • Call the appropriate number listed in the warranty or in the Support Telephone Numbers guide.

Using the Smart Cover FailSafe Key to Remove the Smart Cover Lock

To open the access panel with the Smart Cover Lock engaged:

• 1. Prepare the computer for disassembly ( Preparation for Disassembly ).

  2. Use the Smart Cover FailSafe Key to remove the tamper-proof screw that secures the Smart Cover Lock to the chassis.

     1. 1: Removing the Smart Cover Lock Screw

You can now remove the access panel. See Computer Access Panel .

To reattach the Smart Cover Lock, secure the lock in place with the tamper-proof screw.

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.

• 1. Fasten the security cable by looping it around a stationary object.

     1. 4: Securing the Cable to a Fixed Object

  2. Thread the keyboard and mouse cables through the lock.

• • 1. 5: Threading the Keyboard and Mouse Cables

• 3. Screw the lock to the chassis using the screw provided.

• • 1. 6: Attaching the Lock to the Chassis

• 4. Insert the plug end of the security cable into the lock (1) and push the button in (2) to engage the lock. Use the key provided to disengage the lock.

• • 1. 7: Engaging the Lock

Front Bezel Security

The front bezel can be locked in place by installing a security screw provided by HP.

The security screw is located on the fan duct inside the chassis. To lock the front bezel, remove the security screw from the fan duct (1) and install it through the chassis frame into the front bezel (2) .

8: Installing the Front Bezel Security Screw

Computer Access Panel

• 1. Prepare the computer for disassembly ( Preparation for Disassembly ).

  2. Press the buttons on the left and right sides of the computer (1) then slide the access panel back until it stops and lift it up and off the chassis (2) .

     1. 9: Removing the Access Panel

To install the access panel, reverse the removal procedure.

Front Bezel

• 1. Prepare the computer for disassembly ( Preparation for Disassembly ).

  2. Remove the access panel ( Computer Access Panel ).

  3. Lift up the latch behind the upper right side of the bezel and push down on the latch behind the lower right side of the bezel(2) , then pull the right side of the bezel off the chassis (1) , followed by the left side.

     1. 10: Removing the Front Bezel

To install 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. Remove the front bezel ( Front Bezel )..

  2. To remove the 3.5-inch bezel blank, push the two retaining tabs that hold the bezel blank in place towards the outer right edge of the bezel (1) and slide the bezel blank to the right to remove it (2) .

     1. 11: Removing a 3.5-inch Bezel Blank

  3. To remove the 5.25-inch bezel blank, push the two retaining tabs that hold the bezel blank in place towards the outer left edge of the bezel (1) and pull the bezel blank inwards to remove it (2) .

  4. Replace the front bezel.

Installing Additional Memory

The computer comes with double data rate 2 synchronous dynamic random access memory (DDR2-SDRAM) dual inline memory modules (DIMMs).

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.

DDR2-SDRAM DIMMs

For proper system operation, the DDR2-SDRAM DIMMs must be:

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.

12: DIMM Socket Locations

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 DIMMs

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. If you see an LED light on the system board, voltage is still present.

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 ( Computer Access Panel ).

  3. Rotate up the external drive bay housing and the power supply to access the memory module sockets on the system board.

The computer should automatically recognize the additional memory the next time you turn on the computer.

Expansion Cards

The computer has one PCI expansion slot, one PCI Express x1 expansion slot, one PCI Express x16 expansion slot, and one PCI Express x16 expansion slot that is downshifted to a x4 slot.

The PCI and PCI Express slots support only low profile cards. An optional PCI riser card with two full height standard PCI slots is available from HP.

14: Expansion Slot Locations

You can install a PCI Express x1, x4, x8, or x16 expansion card in the PCI Express x16 slots.

For dual graphics card configurations, the first (primary) card must be installed in the PCI Express x16 slot that is NOT downshifted to a x4 slot.

To install an expansion card:

• 1. Prepare the computer for disassembly ( Preparation for Disassembly ).

  2. Remove the 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. 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 open position.

     1. 15: Opening the Expansion Slot Retainer

  5. Before installing an expansion card, remove the expansion slot cover or the existing expansion card.

• • • 1. Before removing an installed expansion card, disconnect any cables that may be attached to the expansion card.

• 1. Store the removed card in anti-static packaging.

  2. If you are not installing a new expansion card, install an expansion slot cover to close the open slot.

• • • 1. 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.

• 1. 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 bracket on the card is aligned with the open slot on the rear of the chassis. Press the card straight down into the expansion socket on the system board.

     1. 19: Installing an Expansion Card

• • • 1. When installing an expansion card, press firmly on the card so that the whole connector seats properly in the expansion card slot.

• 1. Rotate the slot cover retention latch back in place to secure the expansion card.

  2. Connect external cables to the installed card, if needed. Connect internal cables to the system board, if needed.

  3. Reconfigure the computer, if necessary. Refer to the Computer Setup (F10) Utility Guide for instructions on using Computer Setup.

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) .

System board connectors are color-coded to make it easier to find the proper connection.

21: Drive Positions

To verify the type, size, and capacity of the storage devices installed in the computer, run Computer Setup. Refer to the Computer Setup (F10) Utility Guide for more information.

Installing and Removing 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 a SATA optical drive to the white SATA connector on the system board labeled SATA1.

  • Connect a second SATA hard drive to the next available (unpopulated) SATA connector on the system board by following the numbered sequence of the connectors.

  • Always populate the dark blue SATA0 and white SATA1 connectors before the light blue SATA2 connector.

  • Connect an optional external eSATA drive to the black ESATA connector on the system board.

  • Connect a diskette drive to the connector labeled FLOPPY.

  • Connect a media card reader USB cable to the USB connector on the system board labeled MEDIA. If the media card reader has a 1394 port, connect the 1394 cable to the 1394 PCI card.

  • The system does not support Parallel ATA (PATA) optical drives or PATA hard drives.

  • You must install guide screws to ensure the drive will line up correctly in the drive cage and lock in place. HP has provided extra guide screws for the external drive bays (four 6-32 standard screws and four M3 metric screws), installed in the front of the chassis, under the front bezel. The 6-32 standard screws are required for a secondary hard drive. All other drives (except the primary hard drive) use M3 metric screws. The HP-supplied metric screws are black and the HP-supplied standard screws are silver. If you are replacing the primary hard drive, you must remove the four silver and blue 6-32 isolation mounting guide screws from the old hard drive and install them in the new hard drive.

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.

22: System Board Drive Connections

Removing an Optical Drive

All removable media should be taken out of a drive before removing the drive from the computer.

To remove an optical drive:

To replace the optical drive, reverse the removal procedure. When replacing a drive, transfer the four guide screws from the old drive to the new one.

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 ( Computer Access Panel ).

  3. If you are installing a drive in a bay covered by a bezel blank, remove the front bezel then remove the bezel blank. SeeBezel Blanks for more information.

  4. Install two M3 metric guide screws in the lower holes on each side of the drive. HP has provided four extra M3 metric guide screws on the front of the chassis, under the front bezel. The M3 metric guide screws are black. Refer to Installing and Removing Drives for an illustration of the extra M3 metric guide screws location.

• • • 1. Use only 5-mm long screws as guide screws. Longer screws can damage the internal components of the drive.

      2. When replacing the drive, transfer the four M3 metric guide screws from the old drive to the new one.

• • 1. 27: Installing Guide Screws in the Optical Drive

• 1. Position the guide screws on the drive into the J-slots in the drive bay. Then slide the drive toward the front of the computer until it locks into place.

     1. 28: Installing the Optical Drive

  2. Rotate the drive cage to its upright position.

• • 1. 29: Rotating the Drive Cage Up

• 3. Connect the SATA data cable to the white system board connector labeled SATA1.

  4. Route the data cable through the cable guides.

• • • 1. There are two cable guides that keep the data cable from being pinched by the drive cage when raising or lowering it. One is located on the bottom side of the drive cage. The other is located on the chassis frame under the drive cage. Ensure that the data cable is routed through these guides before connecting it to the optical drive.

The system automatically recognizes the drive and reconfigures the computer.

Removing an External 3.5-inch Drive

All removable media should be taken out of a drive before removing the drive from the computer.

The 3.5-inch drive bay may contain a diskette drive or a media card reader.

The 3.5-inch drive is located underneath the optical drive. You must remove the optical drive before removing the external 3.5-inch drive.

• 1. Follow the procedure in Removing an Optical Drive to remove the optical drive and access the 3.5-inch drive.

• • • 1. Ensure that the computer is turned off and that the power cord is disconnected from the electrical outlet before proceeding.

• 1. Disconnect the drive cables, as indicated in the following illustrations:

• 1. Press the green drive retainer latch (1) located on the right side of the drive to disengage the drive from the drive cage. While pressing the drive retainer latch, slide the drive back until it stops, then lift it up and out of the drive cage (2) .

To replace the 3.5-inch drive, reverse the removal procedure.

When replacing a 3.5-inch drive, transfer the four guide screws from the old drive to the new one.

Installing a Drive into the 3.5-inch External Drive Bay

Depending on the computer configuration, the 3.5-inch external drive bay on the front of the computer may be configured with a media card reader or a diskette drive, or it may be an empty drive bay.

If the computer was not configured with a 3.5-inch drive, you can install a media card reader, diskette drive, or hard drive into the drive bay.

The 3.5-inch bay is located underneath the optical drive. To install a drive into the 3.5-inch bay:

Install guide screws to ensure the drive will line up correctly in the drive cage and lock in place. HP has provided extra guide screws for the external drive bays (four 6-32 standard screws and four M3 metric screws), installed in the front of the chassis, under the front bezel. A secondary hard drive uses 6-32 standard screws. All other drives (except the primary hard drive) use M3 metric screws. The HP-supplied M3 metric screws are black and the HP-supplied 6-32 standard screws are silver. Refer to Installing and Removing Drives for illustrations of the guide screw locations.

• 1. Follow the procedure in Removing an Optical Drive to remove the optical drive and access the 3.5-inch drive bay.

• • • 1. Ensure that the computer is turned off and that the power cord is disconnected from the electrical outlet before proceeding.

• 1. 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 Bezel Blanks for more information.

  2. Position the guide screws on the drive into the J-slots in the drive bay. Then slide the drive toward the front of the computer until it locks into place.

     1. 34: Installing a Drive into the 3.5-inch Drive Bay (Diskette Drive shown)

  3. Connect the appropriate drive cables:

• 1. Replace the optical drive.

  2. Replace the front bezel and access panel.

  3. If the computer was on a stand, replace the stand.

  4. Reconnect the power cord and turn on the computer.

  5. Lock any security devices that were disengaged when the access panel was removed.

Removing and Replacing the Primary 3.5-inch Internal SATA Hard Drive

The system does not support Parallel ATA (PATA) hard drives.

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.

The preinstalled 3.5-inch hard drive is located under the power supply. To remove and replace the hard drive:

• 1. Prepare the computer for disassembly ( Preparation for Disassembly ).

  2. Remove the access panel ( Computer Access Panel ).

  3. Rotate the drive cage for external drives to its upright position.

     1. 35: Rotating the Drive Cage Up

  4. Rotate the power supply to its upright position. The hard drive is located beneath the power supply.

• • • 1. If the computer has a Smart Cover Lock installed next to the drive cage, carefully route all cables around the Smart Cover Lock assembly as you raise the power supply to avoid damage to the cables or lock.

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.

Removing and Replacing a Removable 3.5-inch SATA Hard Drive

Some models are equipped with a Removable SATA Hard Drive Enclosure in the 5.25-inch external drive bay. The hard drive is housed in a carrier that can be quickly and easily removed from the drive bay. To remove and replace a drive in the carrier:

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. Unlock the hard drive carrier with the key provided and slide the carrier out of the enclosure.

  2. Remove the screw from the rear of the carrier (1) and slide the top cover off the carrier (2) .

     1. 41: Removing the Carrier Cover

  3. Remove the adhesive strip that secures the thermal sensor to the top of the hard drive (1) and move the thermal sensor away from the carrier (2) .

• • 1. 42: Removing the Thermal Sensor

• 4. Remove the four screws from the bottom of the hard drive carrier.

• • 1. 43: Removing the Security Screws

• 5. Slide the hard drive back to disconnect it from the carrier then lift it up and out of the carrier.

• • 1. 44: Removing the Hard Drive

• 6. Place the new hard drive in the carrier then slide the hard drive back so that it seats in the SATA connector on the carrier's circuit board. Be sure the connector on the hard drive is pressed all the way into the connector on the carrier's circuit board.

• • 1. 45: Replacing the Hard Drive

• 7. Replace the four screws in the bottom of the carrier to hold the drive securely in place.

• • 1. 46: Replacing the Security Screws

• 8. Place the thermal sensor on top of the hard drive in a position that does not cover the label (1) and attach the thermal sensor to the top of the hard drive with the adhesive strip (2) .

• • 1. 47: Replacing the Thermal Sensor

• 9. Slide the cover on the carrier (1) and replace the screw on the rear of the carrier to secure the cover in place (2) .

• • 1. 48: Replacing the Carrier Cover

• 10. Slide the hard drive carrier into the enclosure on the computer and lock it with the key provided.

• • • 1. The carrier must be locked for power to be supplied to the hard drive.

Fan Shroud

• 1. Prepare the computer for disassembly ( Preparation for Disassembly ).

  2. Remove the access panel ( Computer Access Panel ).

  3. Lift the fan shroud straight up out of the chassis.

     1. 49: Removing the fan shroud

To install the fan shroud, reverse the removal procedure.

Front Fan Assembly

• 1. Prepare the computer for disassembly ( Preparation for Disassembly ).

  2. Remove the access panel ( Computer Access Panel ).

  3. Remove the front bezel ( Front Bezel ).

  4. Remove the fan shroud ( Fan Shroud ).

  5. Disconnect the fan cable from the system board.

  6. Disconnect the hood sensor cable.

  7. Remove the screw that secures the fan to the chassis (1) , slide the fan to the right (2) , tilt the fan so it clears the top of the chassis, and then lift the fan out of the chassis.

     1. 50: Removing the chassis fan

To install the chassis fan, reverse the removal procedure. Be sure to orient the air flow into the unit.

Hood Sensor

The hood sensor is installed in the top of the baffle that is attached to the chassis fan.

• 1. Prepare the computer for disassembly ( Preparation for Disassembly ).

  2. Remove the access panel ( Computer Access Panel ).

  3. Remove the front bezel ( Front Bezel ).

  4. Remove the fan shroud ( Fan Shroud ).

  5. Remove the chassis fan ( Front Fan Assembly ).

  6. Lift the hood sensor straight up and out of the chassis fan baffle.

     1. 51: Removing the hood sensor from the chassis fan

To install the hood sensor, reverse the removal procedure.

Power Switch Assembly

• 1. Prepare the computer for disassembly ( Preparation for Disassembly ).

  2. Remove the access panel ( Computer Access Panel ).

  3. Remove the front bezel ( Front Bezel ).

  4. Remove the chassis fan ( Front Fan Assembly ).

  5. Rotate the drive cage to its upright position.

  6. Disconnect the power switch/LED cable from the system board.

  7. Push the two LEDs into the chassis (1) .

  8. Squeeze the switch holder retaining clips together at the front of the chassis (2) and push the switch assembly into the chassis.

     1. 52: Removing the power switch assembly

  9. Lift the assembly up and out of the chassis, threading the wires through the hole in the drive cage bracket.

  10. Remove the assembly from the chassis.

To install the power switch assembly, reverse the removal procedure.

When installing the left LED, reach through the slot left open by the rotated drive cage to gain access to the hole for the LED.

When installing the power switch, you may need to first insert one clip and the power button, then use a flat-blade screwdriver to help guide the other clip into its slot.

Front I/O Device

• 1. Prepare the computer for disassembly ( Preparation for Disassembly ).

  2. Remove the access panel ( Computer Access Panel ).

  3. Remove the front bezel ( Front Bezel ).

  4. Remove the chassis fan ( Front Fan Assembly ).

  5. Rotate the drive cage to its upright position.

  6. Disconnect the two front I/O cables from the system board.

  7. Remove the screw that secures the front I/O device to the chassis.

  8. Pull the device forward, away from the chassis, and then guide the cables through the hole to remove them from the chassis.

     1. 53: Removing the front I/O device

To reinstall the front I/O device, reverse the removal procedure.

Speaker

• 1. Prepare the computer for disassembly ( Preparation for Disassembly ).

  2. Remove the access panel ( Computer Access Panel ).

  3. Remove the front bezel ( Front Bezel ).

  4. Rotate the drive cage to its upright position.

  5. Disconnect the speaker wire from the system board.

  6. Remove the two screws that secure the speaker to the chassis.

  7. Lift the speaker from the inside of the chassis to remove it.

     1. 54: Removing the speaker

To install the speaker, reverse the removal procedures.

Smart Cover Lock

• 1. Prepare the computer for disassembly ( Preparation for Disassembly ).

  2. Remove the access panel ( Computer Access Panel ).

  3. Remove the power supply to the upright position.

  4. Unplug the Smart Cover Lock cable from the system board.

  5. Remove the security screw that secures the Smart Cover Lock to the back of the chassis, and then remove the Smart Cover Lock from the computer.

     1. 55: Removing the Smart Cover Lock

To install the Smart Cover Lock, reverse the removal procedure

Heatsink

• 1. Prepare the computer for disassembly ( Preparation for Disassembly ).

  2. Remove the access panel ( Computer Access Panel ).

  3. Remove the fan shroud ( Fan Shroud ).

  4. Remove the chassis fan ( Front Fan Assembly ).

  5. Loosen the four captive screws that secure the heatsink to the system board tray.

• • • 1. 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.

• 1. Lift the heatsink from atop the processor and set it on its side to keep from contaminating the work area with thermal grease.

     1. 56: Removing the heatsink

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.

Heatsink retaining screws should be tightened in diagonally opposite pairs (as in an X) to evenly seat the heatsink on the processor to avoid damage that could require replacing the system board.

Failure to install the fan shroud may cause the computer to overheat.

Processor

• • • 1. 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.

• 1. Apply the thermal grease provided in the spares kit to the top of the processor and install the heatsink atop the processor.

  2. Go to step 7.

  3. If using a new heatsink, remove the protective covering from the bottom of the heatsink and place it in position atop the processor.

  4. 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.

• • • 1. 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.

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 .

Power Supply

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 access panel ( Computer Access Panel ).

  3. Rotate the drive cage up and disconnect the power cables from all of the drives.

  4. Disconnect the power cables from the system board.

  5. Rotate the power supply to its full upright position.

  6. Release the power supply cables from the cable retaining clips on the bottom of the chassis and under the drive cage.

     1. 58: Cable routing

  7. Pull the power supply forward until the posts on the power supply move forward in the power supply bracket, and then lift the power supply straight up and out of the chassis.

• • 1. 59: Removing the power supply

To install the power supply, reverse the removal procedure.

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.

System Board

• 1. Prepare the computer for disassembly ( Preparation for Disassembly ).

  2. Remove the access panel ( Computer Access Panel ).

  3. Remove all PCI and PCI Express expansion boards ( Expansion Cards ).

  4. Remove the fan shroud from the chassis ( Fan Shroud ).

  5. Remove the fan from the chassis ( Front Fan Assembly ).

  6. Rotate the drive cage to its upright position.

  7. Rotate the power supply to its full upright position.

  8. Disconnect all data and power cables from the system board.

  9. If applicable, disconnect the serial port from the system board.

  10. Disconnect the balance of the cables from the system board.

  11. Remove the heatsink ( Heatsink ).

  12. Remove the seven screws that secure the system board to the chassis.

      1. 60: Removing the system board

  13. Lift up the front of the system board, and then pull the system board forward, up, and out of the chassis.

To install the system board, reverse the removal procedure.

When replacing the system board, you must also change the chassis serial number in the BIOS.

The heatsink should be installed on the system board before the system board is reinstalled in the chassis.

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.

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.

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 access panel ( Computer Access Panel ).

  4. Rotate the drive cage to its upright position.

  5. Remove the power supply ( Power Supply ).

  6. If necessary, 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 ).

  7. Remove the system board ( System Board ).

  8. Remove the four screws that secure the backwall assembly to the chassis (1) , slide the backwall assembly toward the front of the chassis, and then lift it out of the chassis (2) .

     1. 61: Removing the backwall

To replace the backwall, reverse the removal procedures.

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.

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.

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.

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.

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 .

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 ( Computer Access Panel ).

• • • 1. It may be necessary to remove an expansion card to gain access to the battery.

• 1. Locate the battery and battery holder on the system board.

  2. 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.

     1. 62: Removing the battery from a type 1 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.

     1. 63: Removing the battery from a type 2 holder

  3. Replace the computer access panel.

  4. Plug in the computer and turn on power to the computer.

  5. Reset the date and time, 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.

     1. 64: Removing the battery from a type 3 holder

  3. Replace the computer access panel.

  4. Plug in the computer and turn on power to the computer.

  5. Reset the date and time, your passwords, and any special system setups, using Computer Setup. Refer to the Computer Setup (F10) Utility Guide .

Using the Small Form Factor Computer in a Tower Orientation

The Small Form Factor computer can be used in a tower orientation. The HP logo plate on the front bezel is adjustable for either desktop or tower orientation.

Ensure at least 10.2 centimeters (4 inches) of space on all sides of the computer remains clear and free of obstructions.