HP Compaq dx2100 MT Series Operating and maintenance manual

Hardware Reference Guide
HP Compaq dx2100 Microtower Business
PC
Document Part Number: 403288-001
September 2005
This guide provides basic information about upgrading this computer
model.

© Copyright 2005 Hewlett-Packard Development Company, L.P.
The information contained herein is subject to change without notice.
Microsoft and Windows are trademarks of Microsoft Corporation in the U.S.
and other countries.
The only warranties for HP products and services are set forth in the express
warranty statements accompanying such products and services. Nothing herein
should be construed as constituting an additional warranty. HP shall not be liable
for technical or editorial errors or omissions contained herein.
This document contains proprietary information that is protected by copyright.
No part of this document may be photocopied, reproduced, or translated to
another language without the prior written consent of Hewlett-Packard
Company.
ÅWARNING: Text set off in this manner indicates that failure to follow
directions could result in bodily harm or loss of life.
ÄCAUTION: Text set off in this manner indicates that failure to follow
directions could result in damage to equipment or loss of information.
Hardware Reference Guide
HP Compaq dx2100 Microtower Business PC
First Edition (September 2005)
Document Part Number: 403288-001

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Contents
1 Hardware Upgrades
Serviceability Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
Warnings and Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
Removing the Access Panel and the Front Bezel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
Removing a 5.25" Drive Bezel Blank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5
Installing Additional Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
DIMMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
DDR2-SDRAM DIMMs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
Populating DIMM Sockets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–7
Installing DIMMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–8
Installing an Expansion Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–10
Replacing or Upgrading a Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–12
Locating Drive Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–13
Removing a 5.25" Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–14
Removing a Diskette Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–16
Removing a 3.5" Hard Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–17
2 Battery Replacement
Replacing the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
3 Computer Operating Guidelines, Routine Care and
Shipping Preparation
Computer Operating Guidelines and Routine Care. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
Optical Drive Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
Shipping Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3

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Contents
4ElectrostaticDischarge
Preventing Electrostatic Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
Grounding Methods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1

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1
Hardware Upgrades
HP Compaq dx2100 Microtower
✎The drive configuration shown above may be different than your
computer model.
Serviceability Features
The Microtower computer includes features that make it easy to
upgrade and service. A Torx T-15 screwdriver is needed for many of
the installation procedures described in this chapter.

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Hardware Upgrades
Warnings and Cautions
Before performing upgrades be sure to carefully read all of the
applicable instructions, cautions, and warnings in this guide.
ÅWARNING: To reduce the risk of personal injury from electrical shock
and/or hot surfaces, be sure to disconnect the power cord from the wall
outlet and allow the internal system components to cool before touching.
ÅWARNING: To reduce the risk of electrical shock, fire, or damage to the
equipment, do not plug telecommunications/telephone connectors into
the network interface controller (NIC) receptacles.
ÄCAUTION: Static electricity can damage the electrical 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. See Chapter 4, “Electrostatic Discharge” for more
information.
ÄCAUTION: When the computer is plugged into an AC power source,
voltage is always applied to the system board. You must disconnect the
power cord from the power source before opening the computer to
prevent system board damage.
Removing the Access Panel and the Front Bezel
ÄCAUTION: Before removing the computer access panel, ensure that the
computer is turned off and that the power cord is disconnected from the
electrical outlet.
1. Turn off the computer properly through the operating system and
turn off any external devices.
2. Disconnect the power cord from the power outlet and the
computer, and disconnect any external devices.

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3. Remove the screw that secures the access panel to the computer
chassis 1.
4. Slide the access panel back about 1.25 cm (1/2 inch), then lift it
away from and off the unit 2.
Removing the Access Panel
✎To replace the access panel, reverse the removal steps.

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5. To remove the front bezel, press inward on all three tabs on the
left side of the bezel 1then rotate the bezel off the chassis 2,
beginning with the left side then the right side.
Removing the Front Bezel
✎To replace the front bezel, insert the two hooks on the right side of the
bezel into the rectangular holes on the chassis then rotate the bezel
into place so that the three tabs on the left side of the bezel snap into
the slots on the chassis.

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Removing a 5.25" Drive Bezel Blank
If the computer was not shipped with a drive in the 5.25" option bay,
the bay will be covered by a bezel blank. If you add a drive to the
option bay, you must first remove the bezel blank.
1. Turn off the computer properly through the operating system and
turn off any external devices.
2. Disconnect the power cord from the power outlet and the
computer, and disconnect any external devices.
3. Remove the access panel and front bezel. Refer to “Removing the
Access Panel and the Front Bezel.”
4. While facing the inside of the front bezel, press the two retaining
tabs on the right towards the outer edge of the bezel 1and pull
the bezel blank inwards to remove it 2.
Removing a Bezel Blank
✎To install a bezel blank, slide the left side of the blank into the two
retainer slots on the left side of the front bezel then snap the right side
of the blank into place.

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Hardware Upgrades
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 4GB
of memory configured in a high-performing dual channel mode.
DDR2-SDRAM DIMMs
For proper system operation, the DDR2-SDRAM DIMMs must be:
■industry-standard 240-pin
■unbuffered PC2 4200 533 MHz-compliant
■1.8 volt DDR2-SDRAM DIMMs
The DDR2-SDRAM DIMMs must also:
■support CAS latency 4 (CL = 4) for PC2 4200 533 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
✎The system will not start if you install unsupported DIMMs.

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Hardware Upgrades
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.
The system will automatically operate in single channel mode, dual
channel Asymmetric mode, or a higher-performing dual channel
Interleaved 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 dual channel Asymmetric 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.
■The system will operate in a higher-performing dual channel
Interleaved 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 Interleaved mode.
■In any mode, the maximum operational speed is determined by
the slowest DIMM in the system.
Description Socket Color
DIMM socket XMM1, Channel A Black
DIMM socket XMM2, Channel A White
DIMM socket XMM3, Channel B Black
DIMM socket XMM4, Channel B White

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Installing DIMMs
ÄCAUTION: 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.
ÄCAUTION: 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. For more information, refer to Chapter 4,
“Electrostatic Discharge.”
ÄCAUTION: When handling a memory module, be careful not to touch
any of the contacts. Doing so may damage the module.
1. Turn off the computer properly through the operating system and
turn off any external devices.
2. Disconnect the power cord from the power outlet and the
computer, and disconnect any external devices.
3. Remove the computer access panel.
4. Locate the memory module sockets on the system board.
ÅWARNING: To reduce risk of personal injury from hot surfaces, allow
the internal system components to cool before touching.

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Hardware Upgrades
5. Open both latches of the memory module socket 1, and insert the
memory module into the socket 2.
Installing a DIMM
✎A memory module can be installed in only one way. Match the notch
on the module with the tab on the memory socket.
✎For maximum performance, populate the sockets so that the memory
capacity of Channel A is equal to the memory capacity of Channel B.
For example, if you have one preinstalled DIMM in socket XMM1
and are adding a second DIMM, it is recommended that you install a
DIMM of equal memory capacity into the XMM3 or XMM4 socket.
6. 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.
7. Repeat steps 5 and 6 to install any additional modules.
8. Replace the computer access panel and reconnect the power
cable.
The computer should automatically recognize the additional memory
the next time you turn on the computer.

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Installing an Expansion Card
The computer has two PCI expansion slots that can accommodate
expansion cards up to 17.46 cm (6.875 inches) in length and one PCI
Express x1 expansion slot.
1. Turn off the computer properly through the operating system and
turn off any external devices.
2. Disconnect the power cord from the power outlet and the
computer, and disconnect any external devices.
3. Remove the access panel and lay the computer on its side with the
opening to internal parts facing up.
4. On the rear panel of the computer, remove the screw that secures
the slot cover lock in place 1and slide the slot cover lock away
from the slots to remove it from the computer 2.
Releasing the Slot Cover Lock

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Hardware Upgrades
5. If you are installing an expansion card for the first time, you must
use a flathead 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.
6. Hold the expansion card just above the expansion slot on the
system board then move the card toward the rear of the chassis 1
so that the bottom of the bracket on the card slides into the small
slot on the chassis. Gently press the card straight down into the
expansion slot on the system board 2.
Adding an Expansion Card
Removable Shield Expansion Card Type
Top shield PCI Express x1
Second shield PCI
Third shield PCI
Bottom shield DO NOT REMOVE

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7. While holding the expansion card bracket against the chassis,
slide the slot cover lock down toward the expansion card bracket
to secure it in place and replace the screw that secures the slot
cover lock.
8. Connect external cables to the installed card, if needed. Connect
internal cables to the system board, if needed.
9. Replace the computer access panel and reconnect the power
cable.
✎When installing an expansion card, press firmly on the card so that
the whole connector seats properly in the expansion card slot.
✎To remove an expansion card, reverse the installation procedure.
ÄCAUTION: 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.
Replacing or Upgrading a Drive
The computer supports up to four 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 and retainer screws on a drive.
ÄCAUTION: Make sure you back up your personal files on the hard drive
to an external storage device, such as a CD, 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.

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Hardware Upgrades
Locating Drive Positions
✎The drive configuration shown below may be different than your
computer model.
Drive Positions
15.25" full-height optical drive bay
25.25" full-height option drive bay (diskette drive shown)*
3Two internal 3.5", one-third height bays for hard drives
*The option drive bay accommodates an optical drive or a
diskette drive. A diskette drive requires a 5.25" to 3.5" drive
bay conversion kit.

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Removing a 5.25" Drive
1. Turn off the computer properly through the operating system and
turn off any external devices.
2. Disconnect the power cord from the power outlet and the
computer, and disconnect any external devices.
3. Remove the access panel and front bezel. Refer to “Removing the
Access Panel and the Front Bezel.”
4. Disconnect the power and data cables from the back of the drive.
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.
Removing a 5.25” Drive
6. If the 5.25" drive is a 3.5" diskette drive with a 5.25" adapter kit,
follow the instructions in “Removing a Diskette Drive” to remove
the diskette drive from the 5.25" adapter.
✎To install a drive, reverse the removal procedure. If you are installing
a 5.25" drive for the first time into bay 2 you must first remove the
drive from bay 1 and then use a flathead screwdriver to pry out the
metal shield that covers the front of bay 2.

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Hardware Upgrades
ÅWARNING: There may be sharp edges on the inside of the bay opening
after the shield has been removed.
✎Be sure to install guide screws on the right side of a new drive. The
guide screws help secure the drive in place. There are a total of eight
extra guide/retainer screws on the front of the chassis behind the
bezel. Four have 6-32 standard threads and four have M3 metric
threads. Standard screws are used for hard drives and have a silver
finish. Metric screws are used for all other drives and have a black
finish. Make sure to install the appropriate guide screws into the
drive.

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Removing a Diskette Drive
Some models include an optional 3.5" diskette drive with a 5.25"
drive bay adapter kit installed in the 5.25" option drive bay.
1. Follow the instructions in “Removing a 5.25" Drive” to remove
the diskette drive and adapter kit from the 5.25" drive bay.
2. Remove the bracket brace 1from the top of the drive by
squeezing inward through the slots on both sides of the adapter
and lifting the brace up and off the adapter base.
3. Remove the two screws that secure the drive to the left side of the
drive adapter 2.
4. Slide the drive out of the drive adapter 3.
5. Remove the single guide screw from the front right side of the
drive 4.
Removing a Diskette Drive from the Adapter
✎To reassemble the drive adapter, install the single guide screw on the
front right side of the drive first, then align the guide screw with the
slot on the adapter and slide the drive into the adapter. Then attach the
adapter to the drive with the two screws on the left side and replace
the upper brace.