Dell OptiPlex 270 User manual

Dell™OptiPlex™GX270ServiceManual

Safety Instructions
Opening the Computer Cover
Chassis Intrusion Switch
Control Panel
I/O Panel
Power Supply
System Board
Closing the Computer Cover
To remove or replace all other GX270 components, see the Dell OptiPlex GX270 Systems User's Guide.
Information in this document is subject to change without notice.
©2003–2004DellInc.Allrightsreserved.
Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.
Trademarks used in this text: Dell, the DELL logo, and OptiPlex are trademarks of Dell Inc.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Inc. disclaims any
proprietary interest in trademarks and trade names other than its own.
June 2004 Rev. A01
NOTE: A NOTE indicates important information that helps you make better use of your computer.
NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.
CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death.

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Chassis Intrusion Switch
Dell™OptiPlex™GX270ServiceManual
Removing the Chassis Intrusion Switch
Replacing the Chassis Intrusion Switch
Resetting the Chassis Intrusion Detector


1. Shut down the computer through the Start menu.
2. Ensure that your computer and attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut
down your computer, turn them off now.

3. Disconnect any telephone or telecommunication lines from the computer.
4. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to ground the system board.
5. Remove the computer stand, if it is attached.

6. Open the computer cover.

Removing the Chassis Intrusion Switch
1. Disconnect the chassis intrusion switch cable from the control panel on the front of the computer.

Note the routing of the chassis intrusion cable as you remove it from the chassis. Chassis hooks may hold the cable in place inside the chassis.
2. Slide the chassis intrusion switch out of its slot, and remove the switch and its attached cable from the computer.
Small Form-Factor Computer

Small Desktop Computer

CAUTION: Before you begin any of the procedures in this section, follow the steps in "Safety Instructions."
NOTICE: Before you disconnect a device from the computer or remove a component from the system board, verify that the standby power light on the
system board has turned off. To locate the light, see "System Board."
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network wall jack.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the
computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.

Small Mini-Tower Computer

Replacing the Chassis Intrusion Switch
1. Slide the chassis intrusion switch into its slot and reconnect the cable to the connector on the control panel.
2. Close the computer cover.
3. Attach the computer stand, if it is used.

4. Connect your computer and devices to electrical outlets, and turn them on.
Resetting the Chassis Intrusion Detector
1. Enter system setup by pressing <F2> during the computer's start-up.

2. Under the System Security tab, reset the Chassis Intrusion option by pressing the left-or right-arrow key to select Reset. Change the setting to
Enabled, Enabled-Silent, or Disabled.

NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
NOTE: For instructions on using system setup, see the User's Guide.


3. Press <Alt><b> to restart the computer and implement your changes.
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NOTE: The default is Enabled-Silent.
NOTE: If a setup password has been assigned by someone else, contact the network administrator for information on resetting the chassis intrusion
detector.

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Control Panel
Dell™OptiPlex™GX270ServiceManual
Removing the Control Panel
Replacing the Control Panel


1. Shut down the computer through the Start menu.
2. Ensure that your computer and attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut
down your computer, turn them off now.

3. Disconnect any telephone or telecommunication lines from the computer.
4. Disconnect your computer and all attached devices from their electrical outlets, and press the power button to ground the system board.
5. Remove the computer stand, if it is attached.

6. Open the computer cover.
Removing the Control Panel

Small Form-Factor Computer
1. Using a flat-blade screwdriver, release the four tabs from the inside of the computer, and remove the computer cover from the computer.



CAUTION: Before you begin any of the procedures in this section, follow the steps in "Safety Instructions."
NOTICE: Before you disconnect a device from the computer or remove a component from the system board, verify that the standby power light on the
system board has turned off. To locate the light, see "System Board."
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network wall jack.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the
computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.
1
tabs (2 on each side)
2
computer
3
computer cover

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2. Remove the metal control-panel shield.
3. Remove the screw that holds the control panel to the computer, and remove the control panel.

Small Desktop Computer
1. Remove the front I/O panel (see I/O Panel).

2. Using an 8-inch #2 Phillips screwdriver, remove the screw that secures the control panel to the computer, and lift the panel away from the computer.

Small Mini-Tower Computer
1. To remove the top and bottom panels of the computer, remove any installed CD drives and release all the tabs on each panel.
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1
metal control-panel shield
2
screw


2. To prepare the computer cover for removal, release the three computer cover tabs (one tab is located by the CD drive and two tabs are located by the
I/O panel).

3. If necessary, remove the computer cover screw.
4. Close the computer and remove the computer cover.
5. Remove the screw that secures the control panel to the computer, and pull the control panel away from the computer.

Replacing the Control Panel

Small Form-Factor Computer
1. Replace the control panel and the control-panel shield.
1
computer cover tab (remove the CD drive to access this tab)
4
bottom panel
2
top-panel tabs
5
computer cover screw
3
top panel
6
computer cover tabs (2)
NOTE: To release the tab located by the CD drive, you can pry the computer cover away from the computer and pull out the tab.

2. Replace the computer cover. Ensure that the two metal hooks and tabs are securely in position.

To help replace the computer cover, remove the accent door and front mask from the computer cover:
a. Remove the front mask by releasing the tabs on the inside of the computer cover.
b. Remove the accent door by pressing the middle of the door while you lift away the sides of the door.


3. Replace the computer cover and ensure that the two metal hooks and tabs are securely in position.


4. To replace the front mask and accent door, press them into position.

Small Desktop Computer

1
accent door
2
front mask
1
metal hooks (2)

Follow the steps in the "Removing the Control Panel" procedure in the reverse order, ensuring that all tabs are secure.

Small Mini-Tower Computer

Follow the steps in the "Removing the Control Panel" procedure in the reverse order, ensuring that all tabs are secure.
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

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Opening the Computer Cover
Dell™OptiPlex™GX270ServiceManual

1. Shut down the computer through the Start menu.
2. Ensure that your computer and attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut
down your computer, turn them off now.

3. Disconnect any telephone or telecommunication lines from the computer.
4. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to ground the system board.
5. Remove the computer stand, if it is attached.



Small Form-Factor and Small Desktop Computers
1. Locate the two release buttons shown in the illustration. Then press the two release buttons as you lift the cover.

2. Raise the back of the cover, and pivot it toward the front of the computer.
Small Form-Factor Computer


Small Desktop Computer

CAUTION: Before you begin any of the procedures in this section, follow the steps in "Safety Instructions."
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network wall jack.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Ensure that there is sufficient space to support the open cover—at least 30 cm (1 ft) of desk top space.
NOTICE: Open the cover slowly to ensure that you do not damage any cables.
1
security cable slot
2
padlock ring
3
release buttons (one on each side)



Small Mini-Tower Computer
1. Lay the computer on its side as shown in the illustration.
2. Open the cover:
a. Facing the back of the computer, press the release button on the right side of the computer with one hand while pulling up on the top of the
cover with the other hand.
b. Press the release button on the left side of the computer with one hand while pulling up on the top of the cover with the other hand.
c. Hold the bottom of the computer with one hand, and then pull open the cover with the other hand.


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1
security cable slot
2
padlock ring
3
release buttons (one on each side)
1
release buttons (2)
2
security cable slot
3
padlock ring

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Closing the Computer Cover
Dell™OptiPlex™GX270ServiceManual

1. Ensure that all cables are connected, and fold cables out of the way.

Gently pull the power cables toward you so that they do not get caught underneath the drives.
2. Ensure that no tools or extra parts are left inside the computer.
3. Close the cover:
a. Pivot the cover down.
b. Press down on the right side of the cover until it closes.
c. Press down on the left side of the cover until it closes.
d. Ensure that both sides of the cover are locked. If not, repeat step 3.

4. Connect your computer and devices to electrical outlets, and turn them on.

After you open and close the cover, the chassis intrusion detector, if enabled, causes the following message to appear on the screen at the next
computer start-up:

ALERT! Cover was previously removed.
5. Reset the chassis intrusion detector by entering system setup and changing the Chassis Intrusion setting to Enabled or Enabled-Silent.

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
CAUTION: Before you begin any of the procedures in this section, follow the steps in "Safety Instructions."
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
NOTE: If a setup password has been assigned by someone else, contact your network administrator for information on resetting the chassis intrusion
detector.

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I/O Panel
Dell™OptiPlex™GX270ServiceManual
Removing the I/O Panel
Replacing the I/O Panel
1. Shut down the computer through the Start menu.
2. Ensure that your computer and attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut
down your computer, turn them off now.

3. Disconnect any telephone or telecommunication lines from the computer.
4. Disconnect your computer and all attached devices from electrical outlets and press the power button to ground the system board.
5. If you have installed a padlock through the padlock ring on the back panel, remove the padlock.


6. Open the computer cover.
Removing the I/O Panel
1. On the small form-factor computer, to access the screw that holds the I/O panel to the computer, remove the hard drive.
2. On the small desktop computer, disconnect the hard-drive data cable.
3. Disconnect all cables that are connected to the I/O panel.

Note the routing of the control panel cable as you remove it from the computer so that you can replace it correctly.
4. From inside the computer cover, remove the mounting screw that secures the I/O panel to the computer.
5. Remove the I/O panel from the computer.
Small Form-Factor Computer


CAUTION: Before you begin any of the procedures in this section, follow the steps in "Safety Instructions."
NOTICE: Before you disconnect a device from the computer or remove a component from the system board, verify that the standby power light on the
system board has turned off. To locate the light, see "System Board."
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network wall jack.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the
computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.
1
internal speaker cable
4
mounting screw

Small Desktop Computer


Small Mini-Tower Computer


Replacing the I/O Panel

To replace the I/O panel, follow the removal procedures in the reverse order.
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
2
chassis-intrusion switch cable
5
front audio cable
3
control panel cable
6
I/O cable
1
chassis-intrusion switch cable
4
control panel cable
2
internal speaker cable
5
front audio cable
3
I/O cable
6
mounting screw
1
control panel cable
4
mounting screw
2
front audio cable
5
internal speaker cable
3
I/O cable
6
chassis-intrusion switch cable

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Power Supply
Dell™OptiPlex™GX270ServiceManual
Removing the Power Supply
Replacing the Power Supply

1. Shut down the computer through the Start menu.
2. Ensure that your computer and attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut
down your computer, turn them off now.

3. Disconnect any telephone or telecommunication lines from the computer.
4. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to ground the system board.
5. Remove the computer stand, if it is attached.

6. Open the computer cover.


Removing the Power Supply
Small Form-Factor Computer
1. Disconnect the DC power cables from the system board and the drives.

Note the routing of the DC power cables underneath the tabs in the computer frame as you remove them from the system board and drives. You must
route these cables properly when you replace them to prevent their being pinched or crimped.
2. Press the release button located on the floor of the computer frame.


CAUTION: Before you begin any of the procedures in this section, follow the steps in "Safety Instructions."
NOTICE: Before you disconnect a device from the computer or remove a component from the system board, verify that the standby power light on the
system board has turned off. To locate the light, see "System Board."
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network wall jack.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the
computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.

3. Slide the power supply toward the front of the computer approximately 1 inch.
4. Lift the power supply up and out of the computer.

Small Desktop Computer
1. Disconnect the DC power cables from the system board and the drives.

Note the routing of the DC power cables underneath the tabs in the computer frame as you remove them from the system board and drives. You must
route these cables properly when you replace them to prevent their being pinched or crimped.
2. Remove the expansion-card cage and remove the power cables from the side of the hard drive. To remove the power cables, use the cables as
leverage and pull away from the clips while you pull on the metal clips with your fingers.
3. Press down on the handle, which in turn presses the release button.


4. Slide the power supply toward the front of the computer approximately 1 inch.
5. Lift the power supply up and out of the computer.

Small Mini-Tower Computer
1. Disconnect the DC power cables from the system board and the drives.

Note the routing of the DC power cables underneath the tabs in the computer frame as you remove them from the system board and drives. You must
route these cables properly when you replace them to prevent their being pinched or crimped.
2. Remove the two screws that attach the power supply to the back of the computer frame.
3. Press the release button located on the floor of the computer frame.

1
release button
2
AC power connector
1
release button
2
handle
3
AC power connector

4. Slide the power supply toward the front of the computer approximately 1 inch.
5. Lift the power supply up and out of the computer.
Replacing the Power Supply
1. Slide the power supply into place.
2. On the small mini-tower computer, replace the two screws that secure the power supply to the back of the computer frame.
3. Reconnect the DC power cables.
4. Connect the AC power cable to the connector.
5. On the small desktop computer, reattach the power cables to the side of the hard drive and replace the expansion-card cage.
6. Run the cables underneath the clips, and press the clips to close them over the cables.
7. Close the computer cover.
8. Attach the computer stand, if it is used.

9. Connect your computer and devices to electrical outlets, and turn them on.
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
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.

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System Board
Dell™OptiPlex™GX270ServiceManual

Small Form-Factor System Board
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
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


Small Desktop System Board

1
floppy-drive connector (DSKT)
11
CD drive audio cable connector (CD_IN)
2
CD/DVD drive connector (IDE2)
12
front-panel audio cable connector
(FRONTAUDIO)
3
battery socket (BATTERY)
13
power connector (12VPOWER)
4
front-panel connector
(FRONTPANEL)
14
serial port connector (SER2) for optional
serial port cards
5
IDE hard-drive connector (IDE1)
15
microprocessor and heat sink connector
(CPU)
6
serial ATA hard-drive connector
(SATA1)
16
microprocessor fan connector (FAN)
7
internal speaker (SPEAKER)
17
memory module connectors (DIMM_1 and
DIMM_2)
8
standby power light (AUX_PWR)
18
power connector (POWER)
9
AGP card connector (AGP)
19
RTC reset jumper (RTCRST)
10
PCI card connector
20
password jumper (PSWD)


Small Mini-Tower System Board

1
floppy-drive connector (DSKT)
11
CD drive audio cable connector (CD_IN)
2
CD/DVD drive connector (IDE2)
12
front-panel audio cable connector (FRONTAUDIO)
3
battery socket (BATTERY)
13
power connector (12VPOWER)
4
front-panel connector (FRONTPANEL)
14
serial port connector (SER2) for optional serial port cards
5
IDE hard-drive connector (IDE1)
15
microprocessor and heat sink connector (CPU)
6
serial ATA hard-drive connector (SATA1)
16
microprocessor fan connector (FAN)
7
internal speaker (SPEAKER)
17
memory module connectors (DIMMs 1, 3, 2, and 4)
8
standby power light (AUX_PWR)
18
power connector (POWER)
9
AGP card connector (AGP)
19
RTC reset jumper (RTCRST)
10
PCI riser board connector (PCI2)
20
password jumper (PSWD)



Jumper Settings




Resetting CMOS Settings

1
floppy-drive connector (DSKT)
12
CD drive audio cable connector (CD_IN)
2
CD/DVD drive connector (IDE2)
13
front-panel audio cable connector (FRONTAUDIO)
3
battery socket (BATTERY)
14
power connector (12VPOWER)
4
front-panel connector (FRONTPANEL)
15
serial port connector (SER2) for optional serial port cards
5
IDE hard-drive connector (IDE1)
16
microprocessor and heat sink connector (CPU)
6
serial ATA hard-drive connector (SATA2)
17
microprocessor fan connector (FAN)
7
serial ATA hard-drive connector (SATA1)
18
memory module connectors (DIMMs 1, 3, 2, and 4)
8
internal speaker (SPEAKER)
19
power connector (POWER)
9
standby power light (AUX_PWR)
20
RTC reset jumper (RTCRST)
10
AGP card connector (AGP)
21
password jumper (PSWD)
11
PCI connectors (PCI 1, 2, 3, and 4))


Jumper
Setting
Description
PSWD
(default)
Password features are enabled.

Password features are disabled.
RTCRST

Real-time clock reset.

jumpered unjumpered
CAUTION: Before you begin any of the procedures in this section, follow the steps in "Safety Instructions."