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.
Back to Contents Page Desktop Chassis — Removing and Replacing Parts: Dell Precision™ WorkStation 220 Systems Service Manual 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
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). Restarting the System To restart the system and reset the chassis intrusion detector, perform the following steps: 1.
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. Facing the left side of the computer, hold the cover at a slight angle as shown in Figure 2. 3.
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 2 Ring tabs (2) 3 Posts (2) 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.
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. 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.
1 Left tabs (2) 2 Right tabs (2) 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.
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.
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. Press the green diskette drive retaining-tab release button (see Figure 11) and pull the drive assembly forward to remove it. 4.
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." 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.
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. 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.
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. 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.
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. 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.
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: 1. Rotate the system power supply. 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.
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 14 NIC connector 15 Primary processor (PROC_0) connector 16 AGP connector 17 PCI expansion card connectors (5) 18 3.
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. NOTICE: Make sure your system is turned off before you change a jumper setting.
POWER_2 3.3-V power input connector PROC_0 Primary microprocessor connector PROC_1 Secondary microprocessor connector SER Serial port connectors STANDBY Standby power LED STR Suspend-to-RAM LED USB USB connectors TAPI Telephony connector WUOL Remote Wakeup power connector RIMMs To remove a Rambus in-line memory module (RIMM), perform the following steps. CAUTION: Before you remove the computer cover, see "Precautionary Measures.
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. 1. Remove the computer cover. 2. Remove the airflow shroud. Squeeze in on the two pairs of tabs on the shroud and lift it away. 3. Remove the existing microprocessor from its connector.
To install a replacement microprocessor and heat sink assembly, perform the following steps: 1. Insert the new microprocessor into the system board connector. Press the processor firmly into its connector until it is fully seated. You must use up to 25 lb of force to fully seat the processor in its connector. 2. Replace the airflow shroud. 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.
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.
12. Slide the system board toward the front of the chassis until it stops. 13. Carefully raise the front of the system board and lift the board out of the chassis at an angle. To replace the system board, perform the following steps: 1. Carefully replace the system board in the chassis by performing steps 11 through 13 of the removal process in reverse. 2. Push down near each slot to engage the grounding clip onto its corresponding tab. 3.
Back to Contents Page Mini Tower Chassis — Removing and Replacing Parts: Dell Precision™ WorkStation 220 Systems Service Manual Overview Expansion Cards Recommended Tools Expansion-Card Guide Precautionary Measures Control Panel Restarting the System Chassis Intrusion Switch Computer Cover System Power Supply Interior Service Label System Board Components Internal View RIMMs Front-Panel Inserts Microprocessor/Heat Sink Assembly Front Panel Microprocessor Cooling Fan Drives System Battery
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.
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. 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.
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.
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.
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." 1. Remove the computer cover. 2. Remove the front panel. 3. Disconnect the DC power and data cables from the diskette drive. 4.
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." 1. Remove the computer cover. 2. Remove the front panel. 3. Disconnect the DC power and data cables from the back of the drive. 4.
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." 1. Remove the computer cover. 2. Remove the front panel. 3. Disconnect the DC power and data cables from the rear of the drive. 4. Lift the drive door handle and open the drive door until it disengages from the hard-disk drive bracket (see Figure 13). 5.
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. Be sure to fold down the drive door handle so that the front panel can be replaced on the chassis. Figure 15. Hard-Disk Drive Bracket Insertion 1 Drive bay cage 2 Hard-disk drive bracket 3 Tabs 4.
1 DC power cable 2 Power input connector 3 Interface connector 4 Data cable 6. If it is not already connected, connect the other end of the EIDE cable to the IDE1 connector on the system board. NOTICE: You must match the colored strip on the EIDE cable with pin 1 on the IDE1 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.
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. Insert the tab on one end of the brace into the slot on the card guide at the front of the chassis (see Figure 17). 2. Lower the brace, ensuring that the AGP retention lever is aligned with the top of the AGP card. 3.
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. Expansion-Card Guide Removal 1 Outer tab 2 Expansion card guide To remove the expansion card guide, perform the following steps.
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." 1. Remove the computer cover. 2. Remove the front panel. 3. Remove the AGP card brace. 4. Remove all expansion cards. 5. Remove the expansion card guide. 6.
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: 1. 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.
1. 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. 5.
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 14 NIC connector 15 Primary processor (PROC0) connector 16 AGP connector 17 PCI expansion card connectors (5) 18 3.
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. NOTICE: Make sure your system is turned off before you change a jumper setting.
PCIn PCI expansion-card connector POWER_1 Main power input connector POWER_2 3.3-V power input connector PROC_0 Primary microprocessor connector PROC_1 Secondary microprocessor connector SER Serial port connectors STANDBY Standby power LED STR Suspend-to-RAM LED USB USB connectors TAPI Telephony connector WUOL Remote Wakeup power connector RIMMs To remove a Rambus in-line memory module (RIMM), perform the following steps.
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 25. CAUTION: Before you remove the computer cover, see "Precautionary Measures" 1. Remove the computer cover. 2. Remove the airflow shroud.
1 Airflow shroud 2 Thumbscrews (2) 3 Processor/heat sink assembly 4 Guide bracket 5 Second processor (terminator card if a second processor is not present) 1. Insert the new microprocessor into the system board connector. Press the processor firmly into its connector until it is fully seated. You must use up to 25 lb of force to fully seat the processor in its connector. 2. Replace the airflow shroud.
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. Pull the fan forward to remove it. System Battery Figure 32. System Battery Removal 1 Battery 2 Socket To remove the system battery, perform the following steps.
To remove the system board, 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 25. CAUTION: Before you remove the computer cover, see "Precautionary Measures" 1. Remove the computer cover. 2. Disconnect all cables from their connectors at the back of the computer. 3.