Dell Precision 220 User Manual

DellPrecision™WorkStation220SystemsServiceManual

Desktop Chassis — Removing and Replacing Parts Mini Tower Chassis — Removing and Replacing Parts

Notes, Notices, and Cautions

Throughout this guide, blocks of text may be accompanied by an icon and printed in bold type or in italic type. These blocks are notes, notices, and cautions, and they are used as follows:

Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden. Trademarks used in this text: Dell, Dell Precision, and the DELL logo are trademarks of Dell Computer Corporation.

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 Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own.

Initial release: 30 Nov 1999 Last revised: 26 Oct 2000

NOTE: A NOTE indicates important information that helps you make better use of your system.

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 potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

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Desktop Chassis — RemovingandReplacingParts:DellPrecision™WorkStation220 Systems Service Manual

Overview

This section provides procedures for removing and replacing the components, assemblies, and subassemblies in the Dell Precision WorkStation 220 desktop chassis system.

Unless otherwise noted, each procedure assumes that the following conditions exist:

l You have performed the steps in "Precautionary Measures." l You have removed the computer cover. l You can replace or reinstall a part by performing the removal procedure in reverse order unless additional information is provided.

Recommended Tools

The procedures in this file require the use of a #2 Phillips-head screwdriver. Also, use a wrist grounding strap as explained in "Precautionary Measures."

Precautionary Measures

Before you perform any procedure in this section, take a few moments to read the following caution for your personal safety and to prevent damage to the system from electrostatic discharge (ESD).

Overview

Control Panel

Recommended Tools

Chassis Intrusion Switch

Precautionary Measures

Drives

Restarting the System

System Power Supply

Computer Cover

System Board Components

Interior Service Label

RIMMs

Internal View

Microprocessor/Heat Sink Assembly

Front-Panel Inserts

Microprocessor Cooling Fan

Expansion Cards

System Battery

Expansion-Card Guide

System Board

CAUTION: FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT

Before you start to work on the system, perform the following steps in the sequence listed:

1. Turn off the computer and all peripherals.

2. Disconnect the 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.

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 disconnecting the computer from AC power before disconnecting the peripheral or removing the component to avoid possible damage to the system board.

4. Wear a wrist grounding strap, and clip it to an unpainted metal surface, such as the padlock loop on the back of the chassis. If a wrist grounding strap is not available, touch any unpainted metal surface on the back of the computer or on the computer chassis, such as

thepowersupply,todischargeanystaticchargefromyourbodybeforetouchinganythinginsidethecomputer.Whileyouwork,

periodically touch an unpainted metal surface on the computer chassis to dissipate any static electricity that might harm internal

Restarting the System

To restart the system and reset the chassis intrusion detector, perform the following steps:

1. Replace the computer cover and reconnect the computer and peripherals to their power sources and turn them on.

ALERT! Cover was previously removed.

2. To reset the chassis intrusion detector, enter System Setup, select System Security, and reset Chassis Intrusion to Enabled or

Enabled-Silent.

Computer Cover

Figure 1. Computer Cover Removal

To remove the computer cover, perform the following steps:

1. Turn off your computer and peripherals, and observe the Caution for Your Personal Safety and Protection of the Equipment described in

"Precautionary Measures."

2. If you have installed a padlock through the padlock ring on the back panel, remove the padlock.

3. Press in on the two securing buttons until the cover is free to swing up (see Figure 1).

4. Raise the back of the cover, and pivot it toward the front of the computer.

5. Lift the cover off the hooks at the front of the chassis.

Figure 2. Computer Cover Replacement

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

5. Verify that the standby power light-emitting diode (LED) on the system board is not on. If it is on, you may need to wait 10 to 30 seconds for it to go out (see Figure 21 or the internal service label).

NOTE: When you start the system, the chassis intrusion detector will cause the following message to be displayed at the next system start-up:

NOTE: If a setup password has been assigned by someone else, contact the network administrator for information on resetting the chassis intrusion detector.

Securing buttons (2)

To replace the computer cover, perform the following steps:

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 bracket—they will prevent the cover from closing properly.

2. Facing the left side of the computer, hold the cover at a slight angle as shown in Figure 2.

3. Fit the three cover hooks into the rectangular slots on the chassis. (It might be helpful to look down into the chassis to verify that the hooks are

in place.)

4. Pivot the cover down toward the back and into position. Make sure that the two securing buttons click into place.

Interior Service Label

Figure 3 shows the location of the interior service label on the inside of the top cover. This label shows the location of components within the chassis and locations of system board components and connectors. It also contains an important notice that provides instructions you need to follow to help prevent damage to your system board while you troubleshoot and service the computer system.

Figure 3. Interior Service Label

Internal View

Figure 4 shows the chassis with the cover removed.

Figure 4. Inside the Chassis

Securing buttons (2)

Front-Panel Inserts

Figure5.5.25-Inch Front-Panel Insert Removal

To remove a 5.25-inch front-panel insert, perform the following steps:

1. Position the computer top cover upside down, with the front facing you.

2. From the front of the top cover, use your thumbs to press inward on the insert until it snaps free of the cover.

To replace a 5.25-inch front-panel insert, position the two ring-tabs over the posts on the inside of the bay opening, and then press the ring tabs over the posts.

Expansion Cards

The system accommodates up to six expansion cards, including up to five 32-bit Peripheral Component Interconnect (PCI) expansion cards and one 32-bit accelerated graphics port (AGP) card. (See Figure 6 for examples of these cards.)

Figure 6. Expansion Cards

Externally accessible drive bays

Hard-disk drive bracket

DC power cable

Drive data cable

System board

Expansion card slots

Padlock ring

I/O panel connectors

Security cable slot

AC power receptacle

Power supply

5.25-inch front-panel insert

Ring tabs (2)

Posts (2)

NOTE: Before disconnecting a peripheral from the system or removing a component from the system board, disconnect the power cable and verify that the standby power LED on the system board is off. For the location of this LED, see Figure21.

Expansion-Card Removal

To remove an expansion card, perform the following steps.

1. Remove the computer cover.

2. Disconnect any cables connected to the card.

3. Unscrew the mounting bracket of the card you want to remove (see Figure7).

4. Grasp the card by its outside corners, and ease it out of its connector.

5. If you are removing the card permanently, install a metal filler bracket over the empty card-slot opening.

Figure 7. Expansion Card Removal

Expansion-Card Guide

Figure 8. Expansion-Card Guide Removal

32-bit PCI expansion card

32-bit AGP card

CAUTION: Before you remove the computer cover, see "Precautionary Measures."

NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain Federal Communications Commission (FCC) certification of the system. The brackets also keep dust and dirt out of your computer.

Expansion card

Expansion-card connector

Card edge connector

To remove the expansion-card guide, complete the following steps:

1. Remove the hard-disk drive bracket.

2. Face the computer from the front.

From the outside of the chassis, press in with your fingers on the two tabs on the left side of the expansion-card guide (see Figure 8). This will release the left tabs of the card guide from the chassis.

3. Rotate the released side of the card guide away from the chassis. The left side of the card guide will swing away from the chassis. With the left side of the card guide away from the chassis, you can then pull

the card guide back and out of the chassis, which releases the two right tabs.

Control Panel

Figure 9. Control Panel Removal

To remove the control panel, perform the following steps:

1. Disconnect the control-panel ribbon cable from the PANEL connector on the system board (see Figure 21 or the internal service label for the

location of the PANEL connector).

2. Remove the hard-disk drive bracket.

3. Remove the expansion-card guide.

4. Feed the control-panel ribbon cable through the opening on the floor of the chassis and the opening in the wall of the chassis.

5. Disconnect the speaker and chassis intrusion switch connections.

6. Remove the mounting screw.

Left tabs (2)

Right tabs (2)

Guide pin

Alignment hole

Control panel

Mounting screw

7. Lift the control panel and control-panel ribbon cable free.

To reinstall the control panel, perform the removal procedure in reverse. When you reinstall the control panel, be sure to align the control panel alignment hole and the guide pin located on the left side of the chassis front.



Chassis Intrusion Switch

Figure 10. Chassis Intrusion Switch Removal

To remove the chassis intrusion switch, perform the following steps:

1. From inside the chassis, slide the chassis intrusion switch to the side to release it from the chassis.

2. Disconnect the chassis intrusion switch cable connector from the control panel (see Figure9).

3. Remove the chassis intrusion switch and cable from the chassis.

Note the routing of the chassis intrusion cable to ensure the replacement is routed in the same manner.

4. Install the replacement chassis intrusion switch.

5. Replace the computer cover. Then reconnect your computer and peripherals to their power sources, and turn them on.

6. To reset the chassis intrusion detector, enter System Setup, select System Security,andresetChassis Intrusion to Enabled or

Enabled-Silent.

Drives

Figure 11. Drive Locations 1

Control panel

Screw

Chassis intrusion switch

CAUTION: Before you remove the computer cover, see "Precautionary Measures"

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.

NOTE: In all of the following procedures, left and right refer to your left and right as you face the front of the computer.

3.5-Inch Diskette Drive Removal

To remove the 3.5-inch diskette drive assembly, perform the following steps.

1. Remove the computer cover.

2. Disconnect the DC power and data cables from the diskette drive.

3. Press the green diskette drive retaining-tab release button (see Figure 11) and pull the drive assembly forward to remove it.

4. Remove the mounting screw (see Figure 12).

5. Rotate the diskette drive upward and lift it free.

When you replace the 3.5-inch diskette drive on the bracket, be sure that the two retaining tabs on the right side of the bracket engage the mounting holes in the side of the 3.5-inch diskette drive. Rotate the drive down. Then replace the screw that holds the diskette drive to the bracket. To replace the 3.5-inch diskette drive assembly in the chassis, slide the retaining tabs into the guides on the chassis until the bracket snaps into place.

Figure 11. 3.5-Inch Diskette Drive Removal

Figure 12. 3.5-Inch Diskette Drive Bracket

Hard-disk drives

5.25-inchdrives

3.5-inch diskette drive

CAUTION: Before you remove the computer cover, see "Precautionary Measures."

Retaining-tab release button

5.25-Inch Drive Removal

To remove a device from an externally accessible drive bay, perform the following steps.

1. Remove the computer cover.

2. Disconnect the DC power and data cables from the back of the drive.

3. Squeeze the retaining tabs that extend from each side of the drive bracket and slide the bracket out of the bay (see Figure 13).

4. Turn the drive assembly upside down and unscrew the four screws that secure the drive to the bracket (see Figure 14).

To install a 5.25-inch drive, perform the 5.25-inch drive removal procedure in reverse.

Figure 13. 5.25-Inch Drive Removal

Figure 14. Drive Bracket

3.5-inch diskette drive

Retaining tabs (2)

Bracket

Screw

CAUTION: Before you remove the computer cover, see "Precautionary Measures."

NOTE: For easier access inside the chassis, you may want to rotate the power supply out of the way temporarily.

Retaining tabs (2)

Hard-Disk Drive Removal

To remove a hard-disk drive from the internally accessible drive bracket, perform the following steps.

1. Remove the computer cover.

2. Disconnect the DC power cable and data cable from the drive.

3. Remove the screw holding the hard-disk drive bracket to the drive bay.

4. Rotate the drive bracket upward to disengage it from the latch on the drive bay, slide it to the left, and lift it out of the chassis. (see Figure15).

Figure 15. Hard-Disk Drive Bracket Removal

Figure 16. Hard-Disk Drive Removal

Retaining tabs (2)

Drive bracket

Screws (4)

CAUTION: Before you remove the computer cover, see "Precautionary Measures."

Screw

Hooks (3)

Drive bracket

Latch on drive bay

5. Remove the four screws that secure the hard-disk drive to the drive bracket.

6. Remove the hard-disk drive from the bracket.

Hard-Disk Drive Replacement

To install a replacement hard-disk drive, perform the following steps:

1. Slide the replacement drive into the chosen bay of the drive bracket, oriented so that the connectors on the back of the drive will face the

back of the chassis when the drive bracket is reinstalled (see Figure 16).

2. Align the four screw holes of the drive with the holes in the drive bracket. Insert and tighten the screws (see Figure 16).

3. Reinstall the hard-disk drive bracket in the chassis (see Figure 17).

Insert the drive bracket into the chassis by inserting the hooks in the slots on the front of the chassis and sliding the drive bracket to the right. Then lower the drive bracket to the bottom of the chassis, making sure that the latch on the drive bay is engaged. Replace the screw holding the drive bracket to the drive bay.

Figure 17. Inserting the Drive Bracket

4. Connect a DC power cable to the power input connector on the back of the drive (see Figure18).

Check all connectors to be certain that they are properly cabled and firmly seated.

Screws (4)

Drive bracket

Hard-disk drive

Screw

Hooks (3)

Drive bracket

Latch

5. Connect one of the device connectors on the data cable to the 40-pin interface connector on the back of the hard-disk drive.

NOTICE: You must match the colored strip on the data cable with pin 1 on the drive's interface connector to avoid possible damage to your system.

Figure 18. Attaching Hard-Disk Drive Cables

6. If it is not already connected, connect the other end of the data cable to the data connector on the system board.

NOTICE: You must match the colored strip on the data cable with pin 1 on the data connector to avoid possible damage to your system.

7. Replace the computer cover and restart the system.

8. If the drive you just installed is the primary drive, insert a bootable diskette into drive A.

9. Enter System Setup, and update Primary Drive 0 or Primary Drive 1.

After you update the System Setup settings, reboot the system.

10. Partition and logically format your drive before proceeding to the next step. See the documentation for your operating system for instructions.

11. Test the hard-disk drive by running the Dell Diagnostics (see the online System User's Guide for more information).

12. If the drive you just installed is the primary drive, install your operating system on the hard-disk drive. Refer to the documentation that came with your operating system.

System Power Supply

System Power Supply Rotation

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.

1. Remove the computer cover.

2. Disconnect the AC power cable from the AC power receptacle on the back of the power supply (see Figure 19).

Figure 19. System Power Supply Rotation

NOTE: Ultra ATA/66 hard-disk drives require an 80-conductor cable to transfer data at full speed. The 80-conductor cable has a 40-pin connector just like the Ultra ATA/33 cable but has twice as many wires within the cable itself. If you use an Ultra ATA/33 cable with Ultra ATA/66 hard-disk drives, the drives will transfer data at Ultra ATA/33 speeds.

DC power cable

Power input connector on drive

Data connector on drive

Data cable

Data connector on system board

CAUTION: Before you remove the computer cover, see "Precautionary Measures."

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