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Dell Precision 220 Service Manual
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Dell Precision 220 Service Manual

Dell Precision 220 Service Manual

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Download this manual See also: Service Manual, Information 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:
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.
Information in this document is subject to change without notice.
© 1999 Dell Computer Corporation. All rights reserved.
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

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  • Page 1 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.
  • Page 2 Expansion-Card Guide System Board 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: You have performed the steps in "Precautionary...

  • Page 3: Restarting The System

    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).

  • Page 4: Interior Service Label

    1 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.

  • Page 5: Front-Panel Inserts

    1 Externally accessible drive bays 2 Hard-disk drive bracket 3 DC power cable 4 Drive data cable 5 System board 6 Expansion card slots 7 Padlock ring 8 I/O panel connectors 9 Security cable slot 10 AC power receptacle 11 Power supply Front-Panel Inserts Figure 5.  5.25-Inch Front-Panel Insert Removal 1 5.25-inch front-panel insert...

  • Page 6: Expansion-Card Guide

    1 32-bit PCI expansion card 2 32-bit AGP card Expansion-Card Removal To remove an expansion card, perform the following steps. CAUTION: Before you remove the computer cover, see "Precautionary Measures." 1. Remove the computer cover. 2. Disconnect any cables connected to the card. 3.

  • Page 7: Control Panel

    1 Left tabs (2) 2 Right tabs (2) To remove the expansion-card guide, complete the following steps: 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).

  • Page 8: Chassis Intrusion Switch

    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.  ...
  • Page 9 1 Hard-disk drives 2 5.25-inch drives 3 3.5-inch diskette drive 3.5-Inch Diskette Drive Removal To remove the 3.5-inch diskette drive assembly, perform the following steps. CAUTION: Before you remove the computer cover, see "Precautionary Measures." 1. Remove the computer cover. 2. Disconnect the DC power and data cables from the diskette drive. 3.
  • Page 10 1 3.5-inch diskette drive 2 Retaining tabs (2) 3 Bracket 4 Screw 5.25-Inch Drive Removal To remove a device from an externally accessible drive bay, perform the following steps. CAUTION: Before you remove the computer cover, see "Precautionary Measures." Remove the computer cover.
  • Page 11 1 Retaining tabs (2) 2 Drive bracket 3 Screws (4) Hard-Disk Drive Removal To remove a hard-disk drive from the internally accessible drive bracket, perform the following steps. CAUTION: Before you remove the computer cover, see "Precautionary Measures." 1. Remove the computer cover.

  • Page 12: Hard Disk Drive

    1 Screws (4) 2 Drive bracket 3 Hard-disk drive 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.

  • Page 13: System Power Supply

    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.

  • Page 14: System Board Components

    1 Power supply 2 Securing tab 3 Release latch 4 AC power cable 3. Free the power supply from the securing tab labeled "RELEASE - >, " and rotate it upward until it locks in its extended position. Figure 20. Power Supply Removal 1 Power supply 2 Slot To remove the system power supply, perform the following steps:...
  • Page 15 1 CD-ROM drive audio interface connector 2 Serial port 1 connector 3 Parallel port connector 4 Serial port 2 connector 5 Fan connector 6 VRM connector 7 Microphone connector 8 Line-out connector 9 Line-in connector 10 Keyboard and mouse connectors 11 USB connectors 12 Secondary processor (PROC_1) connector 13 Telephony connector...
  • Page 16   System Board Jumpers Figure 22 shows the location of the jumpers on the system board. Table 1 lists the system board jumpers and their settings. Figure 22. System Board Jumpers Jumpers are small blocks on a circuit board with two or more pins emerging from them. Plastic plugs containing a wire fit down over the pins. The wire connects the pins and creates a circuit.

  • Page 17: Microprocessor/Heat Sink Assembly

    3. Press the RIMM straight into the slot running down the center of the socket until the securing tabs snap into place around the ends of the RIMM. After you replace the computer cover restart the system, run the Dell Diagnostics to verify that the RIMMs are operating properly. Figure 24. Installing a RIMM 1 Securing clips (2) 2 Notches (2) Microprocessor/Heat Sink Assembly...
  • Page 18 CAUTION: Before you remove the computer cover, see "Precautionary Measures" 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. Remove the computer cover.

  • Page 19: Microprocessor Cooling Fan

    Squeeze in on the two pairs of tabs on the shroud, align it with the slots in the microprocessor fan, and lower it into place. 3. After you replace the computer cover restart the system, run the Dell Diagnostics to verify that the new microprocessor is operating correctly. Microprocessor Cooling Fan Figure 27. Microprocessor Cooling Fan Removal...

  • Page 20: System Board

    CAUTION: There is a danger of the new battery exploding if it is incorrectly installed. Replace the battery only with the same or equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturer’s instructions. To remove the system battery, perform the following steps. CAUTION: Before you remove the computer cover, see "Precautionary Measures."...
  • Page 21 7. Replace the computer cover, connect all cables, and restart the system. Run System Setup to ensure that your settings are correct and that all system board components are correctly reported. 8. Run the Dell Diagnostics. Back to Contents Page...

  • Page 22: Recommended Tools

    AGP Card Brace System Board Overview This section provides procedures for removing and replacing the components, assemblies, and subassemblies in the Dell Precision WorkStation 220 mini tower chassis system. Unless otherwise noted, each procedure assumes that the following conditions exist: You have performed the steps in "Precautionary...
  • Page 23 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 components. Also avoid touching components or contacts on a card and avoid touching pins on a chip. 4. 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 the interior service label Figure...
  • Page 24 1 Left cover release button 1. Lift the bottom of the cover, allowing it to pivot up toward you, and lift the cover away. Figure 3. Computer Cover Replacement 1 Hook 2 Recessed slot To replace the computer cover, perform the following steps: 1.
  • Page 25 Figure 4. Interior Service Label Internal View Figure 5 shows a top view of the mini tower chassis to help you orient yourself when you work inside the computer. Figure 5. Inside the Mini Tower Chassis 1 Externally accessible drive bays 2 Hard-disk drive cage 3 Chassis...

  • Page 26: Front Panel

    1 Front panel 2 Posts (2) 3 Ring tabs (2) 4 5.25-inch front-panel insert To remove a 5.25-inch front-panel insert, perform the following steps: 1. Hold the front panel 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.
  • Page 27 Figure 8. Drive Locations 1 3.5-inch diskette drive 2 5.25-inch drive bays (3)  3 Hard-disk drive 3.5-Inch Diskette Drive Removal To remove the 3.5-inch diskette drive assembly, perform the following steps. CAUTION: Before you remove the computer cover, see "Precautionary Measures." Remove the computer cover.
  • Page 28 1 3.5-inch diskette drive 2 Retaining tabs (2) 3 Bracket 4 Screw 5.25-Inch Drive Removal To remove a device from an externally accessible drive bay, perform the following steps. CAUTION: Before you remove the computer cover, see "Precautionary Measures." Remove the computer cover.
  • Page 29 1 Retaining tabs (2) 2 Drive bracket 3 Screws (4) Hard-Disk Drive Removal To remove a hard-disk drive, perform the following steps. CAUTION: Before you remove the computer cover, see "Precautionary Measures." Remove the computer cover. Remove the front panel. 3.
  • Page 30 1 Hard-disk drive bracket 2 Second drive bay 3 Drive 4 Screws (4) 3. Reinstall the hard-disk drive bracket in the chassis (see Figure 15). Insert the hard-disk drive bracket into the drive bay cage by gently sliding it in until the tabs snap into place. Close the drive door until it snaps securely into place.
  • Page 31 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.
  • Page 32 1 Expansion card guide 2 AGP card brace 3 Screw 4 AGP retention lever 5 Tab 6 Slot 3. Rotate the brace up until it disengages from the card guide at the front of the chassis. Then lift it away from the chassis. To replace the brace, perform the following steps: 1.
  • Page 33 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. Figure 19. Expansion Card Removal 1 Expansion card 2 Expansion-card connector 3 Card edge connector Expansion-Card Guide Figure 20.
  • Page 34 1 Control panel 2 Screw 3 Speaker connector 4 Chassis intrusion switch 5 Handle 6 Door To remove the control panel, perform the following steps. CAUTION: Before you remove the computer cover, see "Precautionary Measures." Remove the computer cover. Remove the front panel.
  • Page 35 3 Enlarged hole for cable 4 Switch slot 5 Chassis intrusion switch CAUTION: Before you remove the computer cover, see "Precautionary Measures." To remove the chassis intrusion switch and install a replacement, perform the following steps: Disconnect the chassis intrusion switch cable from the control panel (see Figure 21). Note the routing of the chassis intrusion cable as you remove the cable from the chassis. The cable is routed through an enlarged hole in the chassis and through a hole in the disk-drive cage door. The chassis intrusion switch is mounted on the left front of the chassis (see ...
  • Page 36 Rotate the system power supply to its fully extended position. 2. Disconnect the power cables from all drives. 3. Remove the power supply cables from the system board. 4. Lift the front of the power supply until it stops. Then lift the front of the power supply up and away from the chassis. The front pivot pin raises in the chassis slot and exits the chassis with this action.
  • Page 37 1 CD-ROM drive audio interface connector 2 Serial port 1 connector 3 Parallel port connector 4 Serial port 2 connector 5 Fan connector 6 VRM connector 7 Microphone connector 8 Line-out connector 9 Line-in connector 10 Keyboard and mouse connectors 11 USB connectors 12 Secondary processor (PROC1) connector 13 Telephony connector...
  • Page 38 31 RTCRST jumper 32 Battery socket   System Board Jumpers Figure 26 shows the location of the jumpers on the system board. Table 1 lists the system board jumpers and their settings. Figure 26. System Board Jumper Jumpers are small blocks on a circuit board with two or more pins emerging from them. Plastic plugs containing a wire fit down over the pins. The wire connects the pins and creates a circuit.
  • Page 39 3. Press the RIMM straight into the slot running down the center of the socket until the securing tabs snap into place around the ends of the RIMM. After you replace the computer cover restart the system, run the Dell Diagnostics to verify that the RIMMs are operating properly. Figure 28. RIMM Installation 1 Securing clips (2) 2 Notches (2)
  • Page 40 Microprocessor/Heat Sink Assembly To replace a microprocessor, perform the following steps. NOTE: Before disconnecting a peripheral from the system or removing a component from the system board, disconnect the system power cord and verify that the standby power LED on the system board is off. For the location of this LED, see Figure CAUTION: Before you remove the computer cover, see "Precautionary...
  • Page 41 Squeeze in on the two pairs of tabs on the shroud, align it with the slots in the microprocessor fan, and lower it into place. 3. After you replace the computer cover restart the system, run the Dell Diagnostics to verify that the new microprocessor is operating correctly. Microprocessor Cooling Fan Figure 31. Microprocessor Cooling Fan Removal...
  • Page 42 3. Remove the airflow shroud. Squeeze in on the two pairs of tabs on the shroud and lift it away. 4. Disconnect the fan power cable from the microprocessor fan connector (see Figure 31). 5. Gently pull the plastic lock, and push down on the fan to disengage the four latching tabs holding the fan to the back of the chassis. 6.
  • Page 43 7. Replace the computer cover, connect cables, and turn on the power. Run the System Setup program to ensure your settings are correct and all system board components are correctly reported. 8. Run the Dell Diagnostics. Back to Contents Page...

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