Dell PowerEdge 300 Referenzhandbuch

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Checking Inside the Computer 7-1

CHAPTER 7

Checking Inside the Computer

Your Dell PowerEdge 300 system supports a variety of internal options that expand

system capabilities. This file prepares you to install options inside the computer. It

describes how to remove and replace the computer cover and rotate the power sup-

ply away from the system board. It also familiarizes you with the internal components

you may handle if you install Dell hardware options.

Before You Begin

To make working inside your computer easier, make sure you have adequate lighting

and a clean work space. If you temporarily disconnect cables or remove expansion

cards, note the position of the connectors and slots so that you can reassemble the

system correctly.

You will use the information in this section every time you install a hardware option

inside your computer.

Read this section carefully

, because the information is not

repeated in such detail elsewhere in this guide.

Safety First—For You and Your Computer

Working inside your computer is safe—

you observe the following precautions.

WARNING: FOR YOUR PERSONAL SAFETY AND PROTECTION OF YOUR

EQUIPMENT

Before starting to work on your computer, perform the following steps in the

sequence indicated:

1. Turn off your computer and all peripherals.

2. Disconnect your computer and peripherals from their AC power sources.

Also, disconnect any telephone or telecommunication lines from the com-

puter. Doing so reduces the potential for personal injury or shock.

3. If you are disconnecting a peripheral from the computer or are removing a

component from the system board, wait 10 to 20 seconds after disconnect-

ing the computer from AC power before disconnecting the peripheral or

removing the component to avoid possible damage to the system board.

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7-2 Installation and Troubleshooting Guide

4. To verify that all power has been removed from the system, make sure that

the standby light-emitting diode (LED) on the system board has gone out.

For the location of this LED, see Figure 8-1, in Chapter 8, “Installing System

Board Options”.

5. Touch an unpainted metal surface on the computer chassis, such as the

power supply, before touching anything inside your computer.

6. While you work, periodically touch an unpainted metal surface on the com-

puter chassis to dissipate any static electricity that might harm internal

components. Also avoid touching components or contacts on a card and

avoid touching pins on a chip.

In addition, Dell recommends that you periodically review the safety instructions at

the front of this guide.

Unpacking Your Hardware Option

When you remove an option from its shipping carton, you may find it wrapped in anti-

static packing material designed to protect it from electrostatic damage. Do not

remove the packing material until you are ready to install the option.

CAUTION: See “Protecting Against Electrostatic Discharge,” in the safety

instructions at the front of this guide.

Removing the Computer Cover

Use the following procedure to remove the computer cover:

1. Turn off your computer and peripherals, and make sure you unplug the computer

from its electrical outlet before you remove the computer cover. Observe the

Warning for “Safety First—For You and Your Computer”at the front of this chap-

ter. Also observe the safety instructions at the front of this guide.

2. If you have installed a padlock through the padlock ring on the back panel (see

Figure 7-1), remove the padlock.

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Checking Inside the Computer 7-3

Figure 7-1. Padlock Installed

3. Remove the cover.

4. Facing the left side cover, press the release button (located at the bottom-left cor-

ner of the front bezel) and lift the bottom of the cover, allowing it to pivot up

toward you (see Figure 7-2).

5. Disengage the tabs that secure the cover to the top of the chassis, and lift the

cover away.

padlock ring

security

cable slot

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7-4 Installation and Troubleshooting Guide

Figure 7-2. Removing the Computer Cover

Replacing the Computer Cover

Use the following procedure to replace the computer cover:

1. Check all cable connections, especially those that might have come loose during

your work. Fold cables out of the way so that they do not catch on the computer

cover. Make sure cables are not routed over the drive cage—they will prevent the

cover from closing properly.

2. Check to see that no tools or extra parts (including screws) are left inside the

computer's chassis.

3. Replace the cover.

4. Facing the left side of the computer, hold the cover at a slight angle as shown in

Figure 7-3, and then align the top of the cover with the top of the chassis. Hook

release button

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Checking Inside the Computer 7-5

the tabs on the cover into the recessed slots on the computer chassis so that the

tabs catch the hooks inside the slots.

Pivot the cover down toward the bottom of the chassis and into position. Make

sure the securing hooks at the bottom of the cover click into place.

Figure 7-3. Replacing the Computer Cover

5. If you are using a padlock to secure your system, reinstall the padlock.

NOTE: After removing and replacing the chassis, the chassis intrusion detector will

cause the following message to be displayed at the next system start-up:

ALERT! Cover was previously removed

6. Reset the chassis intrusion detector by entering the System Setup program and

setting Chassis Intrusion to Not Detected.See“Using the System Setup Pro-

gram”in your

User's Guide

for instructions.

NOTE: If a setup password has been assigned by someone else, contact your net-

work administrator for information on resetting the chassis intrusion detector.

recessed slot

tabs (3)

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7-6 Installation and Troubleshooting Guide

Inside Your Computer

Figure 7-4 shows a side view of your computer to help you orient yourself when

installing hardware options. Unless otherwise specified, locations or directions rela-

tive to the computer are as shown.

Figure 7-4. Computer Orientation View

Figure 7-5 shows your computer with its cover removed. Refer to this illustration to

locate interior features and components discussed in this guide.

right sideleft side

back of computer

front of computer

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Checking Inside the Computer 7-7

Figure 7-5. Inside the Chassis

The system board holds the computer's control circuitry and other electronic compo-

nents. Some hardware options are installed directly on the system board. Drive

support is as follows:

•The three 5.25-inch external drive bays provide space for up to three drives,

including a 3.5-inch diskette drive (standard) and, typically, an optional CD-ROM

drive and/or tape drive.

•The removable hard-disk drive cage provides space for up to three 1-inch hard-

disk drives.

When you look inside the computer, note the DC power cables leading from the

power supply. The power cables supply power to the system board, drives, and any

expansion cards that connect to external peripherals.

The wide ribbon cables are the interface cables for internal drives. For the diskette

drive, an interface cable connects each drive to an interface connector on the system

board or on an expansion card. For IDE devices, interface cables connect the devices

power supply

AC power

receptacle

security

cable lock

input/output

(I/O) panel

expansion

card slots

padlock ring

system board

drive power cable

drive interface

cable

external

drive bays

internal

drive bays

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7-8 Installation and Troubleshooting Guide

to an IDE connector on the system board. (For more information, see Chapter 9,

“Installing Drives.”)

During an installation or troubleshooting procedure, you may be required to change

a jumper or switch setting. For information on the system board jumpers, see

Appendix B, “Jumpers, Switches, and Connectors.”

Rotating the Power Supply Away From the

System Board

To access some components on the system board, you may have to rotate the sys-

tem power supply out of the way. Use the following procedure to rotate the power

supply:

1. Remove the computer cover as instructed in “Removing the Computer Cover”

earlier in this chapter.

2. Disconnect the AC power cable from the AC power receptacle on the back of the

power supply (see “Rotating the Power Supply”).

Figure 7-6. Rotating the Power Supply

3. Free the power supply by pressing the securing tab labeled “RELEASE,”then

rotate the power supply upward until it locks in one of its extended positions.

power supply

AC power

receptacle

AC power

cable

DC power

cables

securing tab

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Checking Inside the Computer 7-9

4. The power supply bracket has detents to hold the power supply up in one of sev-

eral extended positions, which are especially useful when the chassis is standing

upright.

Removing and Replacing the Front Bezel

The bezel is secured to the front of the chassis by two tabs and two hooks. The tab

release for the bezel is at the top of the computer chassis and can be accessed only

with the computer cover removed (see “Replacing the Computer Cover”). With the

cover removed, release the bezel by pressing the tab release marked with the icon

(see Figure 7-7).

Figure 7-7. Removing the Front Bezel

While pressing the tab release, tilt the bezel away from the chassis, disengage the

two retaining hooks at the bottom of the bezel, and carefully pull the bezel away from

the chassis.

release tab

retaining hooks (2)

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7-10 Installation and Troubleshooting Guide

To replace the bezel, fit the two retaining hooks on the bezel into their corresponding

slots at the bottom of the chassis. Then rotate the top of the bezel toward the chassis

until the top tabs snap into their corresponding slots on the bezel.

Removing and Replacing Front-Panel

Inserts

Empty 5.25-inch drive bays contain a front-panel insert to protect the inside of the

computer from dust particles and also to ensure proper airflow within the computer.

Before you install a drive in an empty drive bay, you must first remove the front-panel

insert (see Figure 7-8).

To remove the insert covering a drive bay,

follow these steps:

1. Turn off the system, including any attached peripherals, and disconnect all the AC

power cables from their power sources.

2. Remove the computer cover as instructed in “Removing the Computer Cover,”

earlier in this chapter.

3. Remove the front bezel using the instructions in “Removing and Replacing the

Front Bezel,”earlier in this chapter.

4. With your thumbs, press in on each end of the insert until the insert snaps free of

the bezel.

905grbk0.book Page 10 Friday, September 1, 2000 9:30 AM

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