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Working Inside Your Computer: Dell Precision™ WorkStation 620 Systems User's Guide
Your Dell Precision 620 system supports a variety of internal options that expand
system capabilities. This section prepares you to install options inside the computer. It
describes how to remove and replace the computer cover and rotate the power supply away
from the system board. It also familiarizes you with the internal components that you may
handle if you install Dell™ hardware options.
To make working inside your computer easier, make sure that 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 detail elsewhere in this guide.
Working inside your computer is safe if you observe the following precautions.
 |
CAUTION FOR YOUR PERSONAL SAFETY AND PROTECTION OF YOUR EQUIPMENT |
Before starting to work on your computer, perform the following steps in the sequence indicated:
- Turn off your computer and all peripherals.
- Disconnect your computer and peripherals from their AC power sources. Also,
disconnect any telephone or telecommunication lines from the computer. Doing so reduces
the potential for personal injury or shock.
- If you are disconnecting a peripheral from the computer or are removing a
component from the system board, wait 10 to 20 seconds after disconnecting the computer
from AC power before disconnecting the peripheral or removing the component to avoid
possible damage to the system board.
To verify that all power has been removed from the system, make sure that the
standby power light-emitting diode (LED) on the system board has gone out. For the
location of this LED, see Figure 1
in "Installing System Board Options."
- Touch an unpainted metal surface on the computer chassis, such as the power
supply, before touching anything inside your computer.
While you work, periodically touch an unpainted metal surface on the computer
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 in
your Dell Precision WorkStations System Information Guide.
When you remove an option from its shipping carton, you may find it wrapped in
antistatic packing material designed to protect it from electrostatic damage. Do not
remove the packing material until you are ready to install the option.
| NOTICE: See "Protecting Against Electrostatic
Discharge" in your Dell Precision WorkStations System Information Guide. |
- Turn off your computer and peripherals, and unplug the computer from its electrical
outlet before you remove the computer cover.
- If you have installed a padlock through the padlock ring on the back panel (see Figure
1), remove the padlock.
- Slide the padlock ring to the open position.
Figure 1. Padlock Installed
|
| 1 |
Security cable slot |
| 2 |
Padlock ring |
|
- Facing the left side cover, press the release button (located at the bottom-left corner
of the front bezel) and lift the bottom of the cover, allowing it to pivot up toward you
(see Figure 2).
- Disengage the tabs that secure the cover to the top of the chassis, and lift the cover
away.
Figure 2. Removing the Computer Cover
- 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.
- Check to see that no tools or extra parts (including screws) are left inside the
computer's chassis.
- Facing the left side of the computer, hold the cover at a slight angle as shown in
Figure 3, and then align the top of the cover with the top of the chassis. Hook the three
tabs on the cover into the three 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. Using both
hands, press against the bottom edge of the cover and ensure that all of the securing
hooks at the bottom of the cover click into place.
Figure 3. Replacing the
Computer Cover
- Slide the padlock ring to the closed position. If you are using a padlock to secure your
system, reinstall the padlock.
- Replace the computer cover, reconnect the network cable and phone line if present,
reconnect your computer and peripherals to their electrical outlets, and turn them on.
 |
NOTE: After you remove and replace the cover, the chassis intrusion
detector will cause the following message to be displayed at the next system start-up: |
ALERT! Cover was previously removed.
- To reset the chassis intrusion detector, enter System Setup, select System
Security, and reset Chassis Intrusion to Enabled, Enabled-Silent, or Disabled.
|
NOTE: If a setup password has been assigned by someone else, contact the network administrator for information on resetting the chassis intrusion detector. |
To access any expansion cards and some components on the system board, you must first
remove the accelerated graphics port (AGP) card brace that secures an AGP card in the AGP socket.
|
NOTE: The AGP card brace is not required for
proper system operation, and can be removed after the system is set up. If you remove the
AGP card brace, save it for reinstallation before you move or ship the system. |
- Remove the computer cover.
- Remove the screw that secures the AGP card brace through the AGP expansion card's
mounting bracket to the back of the chassis (see Figure 4).
Figure 4. Removing the AGP Card Brace
 |
| 1 |
Card guide (front of chassis) |
| 2 |
AGP card brace |
| 3 |
Card brace spring |
| 4 |
Screw |
| 5 |
Plastic card guide |
| 6 |
Slot |
| 7 |
Tab |
|
- Slide the card brace forward until it disengages from the slot in the card guide located
on the front of the chassis, and then rotate the brace up and lift it away from the
chassis.
- Replace the screw to secure the AGP card's mounting bracket to the back of the chassis.
To replace the brace, perform the following steps:
- Insert the tab on one end of the brace into the slots on the card guide located on the
front of the chassis (see Figure 4).
- Lower the brace, ensuring that the plastic AGP card guide, located on the bottom of the
brace, is engaged with the top of the AGP card.
- Replace the screw that secures the brace through the AGP expansion card's mounting
bracket to the chassis.
Figure 5 shows a side view of a mini tower chassis to help you orient yourself when
installing hardware options. Unless otherwise specified, locations or directions relative
to the computer are as shown.
Figure 5.
Computer Orientation View
|
| 1 |
System board |
| 2 |
Externally accessible drives |
| 3 |
Internally accessible drives |
| 4 |
Power supply |
| 5 |
Memory expansion card assembly |
| 6 |
Processor retention bracket |
|
Figure 6 shows a mini tower chassis with its cover removed. Refer to this illustration
to locate interior features and components of the Mini Tower chassis discussed in this guide.
Figure 6. Inside
the Chassis
|
| 1 |
Externally accessible drive bays |
| 2 |
Hard-disk drive cage |
| 3 |
Power Supply |
| 4 |
Cable lock slot |
| 5 |
Padlock ring (with padlock) |
| 6 |
AC power receptacle |
| 7 |
Expansion-card slots |
| 8 |
Integrated network controller connector |
| 9 |
Diagnostic LEDs |
| 10 |
Two USB connectors |
| 11 |
Audio line-in connector |
| 12 |
Audio line-out connector |
| 13 |
Microphone connector |
| 14 |
PS/2 mouse connector |
| 15 |
PS/2 keyboard connector |
| 16 |
Serial port 2 connector |
| 17 |
Serial port 1 connector |
| 18 |
SCSI port connector |
| 19 |
Parallel port connector |
|
To access some components on the system board, you may have to rotate the system power
supply out of the way. To rotate the power supply, perform the following steps:
- Remove the computer cover.
- Disconnect the AC power cable from the AC power receptacle on the back of the power
supply (see Figure 7).
Figure
7. Rotating the Power Supply
- Pull the green handle out and slide the power supply forward. With the handle pulled
out, rotate the power supply down to a vertical position.
To return the power supply to its original position, perform the following steps.
- Rotate the power supply to its original position and hold it there (see Figure 7).
- Rotate the green handle towards the back of the system until it is closed.
Make sure the handle latches the power supply properly and the power supply slides
slightly to the back of the system and locks in place.
- Replace the cover.
- Reconnect the AC power cable to the AC power receptacle on the back of the power supply.
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