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Service Only Parts Replacement Procedures

Dell™ PowerEdge™ SC420 Systems Installation and Troubleshooting Guide

  Before You Begin

  Recommended Tools

  Bezel

  Control Panel

  I/O Panel

  Chassis Intrusion Switch

  System Board

Before You Begin

CAUTION: See your Product Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge.

Recommended Tools

You may need the following items to perform the procedures in this section:

• #2 Phillips screwdriver
  
  
• Wrist grounding strap
  
  

Bezel

Removing the Bezel

CAUTION: See your Product Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge.

1. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet.
   
   
2. Open the system. See "Opening the System" in "Troubleshooting Your System."
   
   
3. Remove the screw that secures the bezel to the front panel. See Figure C-1.
   
   
4. Remove any 5.25-inch optical drives or tape drives to gain access to the bezel release tab. See "5.25-Inch Optical and Tape Drives" in "Installing Drives."
   
   
5. Release the bezel by pressing the three bezel release tabs. See Figure C-1.
   
   

Press the bezel release tab next to the cover hinge first and then press the other two release tabs. See Figure C-1.

6. After pressing the three bezel release tabs, close the system half way and pull the bezel away from the system.
   
   

Figure C-1. Removing the Bezel

Installing the Bezel

1. Align the three bezel release tabs with the system's front panel.
   
   
2. Press the bezel onto the system until it snaps into place.
   
   
3. Install the screw that secures the bezel to the front panel. See Figure C-1.
   
   
4. Install any 5.25-inch optical or tape drives that you removed to gain access to the bezel release tab. See "5.25-Inch Optical and Tape Drives" in "Installing Drives."
   
   
5. Close the system. See "Closing the System" in "Troubleshooting Your System."
   
   
6. Reconnect the system to the electrical outlet, and turn on the system.
   
   

Control Panel

Removing the Control Panel

CAUTION: See your Product Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge.

1. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet.
   
   
2. Open the system. See "Opening the System" in "Troubleshooting Your System."
   
   
3. Remove the bezel. See "Removing the Bezel."
   
   
4. Disconnect the control panel cable that connects to the I/O panel. See Figure C-2.
   
   
5. Using a #2 Phillips screwdriver, remove the screw that secures the control panel to the front panel. See Figure C-2.
   
   

Figure C-2. Removing and Installing the Control Panel

Installing the Control Panel

1. Align the two alignment holes in the control panel with the two alignment pins on the front panel. See Figure C-2.
   
   
2. Lower the control panel onto the two alignment pins.
   
   
3. Using a #2 Phillips screwdriver, install the screw that secures the control panel to the front panel.
   
   
4. Connect the control panel cable from the I/O panel to the control panel. See Figure C-2.
   
   
5. Install the bezel. See "Installing the Bezel."
   
   
6. Close the system. See "Closing the System" in "Troubleshooting Your System."
   
   
7. Reconnect the system to the electrical outlet, and turn on the system.
   
   

I/O Panel

Removing the I/O Panel

CAUTION: See your Product Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge.

1. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet.
   
   
2. Open the system. See "Opening the System" in "Troubleshooting Your System."
   
   
3. Disconnect the following cables from the I/O panel:
   
   
   • Control panel
     
     
   • Chassis intrusion switch
     
     
   • I/O panel
     
     
4. Using a #2 Phillips screwdriver, remove the screw that secures the I/O panel to the chassis. See Figure C-3.
   
   

Figure C-3. Removing and Installing the I/O Panel

5. Slide the I/O panel upward and remove the I/O panel from the system.
   
   

Installing the I/O Panel

1. Align the I/O panel with the mounting hole on the front panel. See Figure C-3.
   
   
2. Slide the I/O panel down until it stops.
   
   
3. Using a #2 Phillips screwdriver, install the screw that secures the I/O panel to the chassis.
   
   
4. Connect the following cables:
   
   
   • I/O panel
     
     
   • Chassis intrusion switch
     
     
   • Control panel
     
     
5. Close the system. See "Closing the System" in "Troubleshooting Your System."
   
   
6. Reconnect the system to the electrical outlet, and turn on the system.
   
   

Chassis Intrusion Switch

Removing the Chassis Intrusion Switch

CAUTION: See your Product Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge.

1. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet.
   
   
2. Open the system. See "Opening the System" in "Troubleshooting Your System."
   
   
3. Disconnect the chassis intrusion switch cable from the switch connector on the I/O panel. See Figure C-3.
   
   
4. Slide the chassis intrusion switch out of the securing bracket notch. See Figure C-4.
   
   

Figure C-4. Removing and Installing the Chassis Intrusion Switch

5. Remove the switch and its attached cable from the system.
   
   

Installing the Chassis Intrusion Switch

1. Align the chassis intrusion switch with the securing bracket notch. See Figure C-4.
   
   
2. Slide the switch into the securing bracket notch.
   
   
3. Connect the switch cable to the switch connector on the I/O panel. See Figure C-3.
   
   
4. Close the system. See "Closing the System" in "Troubleshooting Your System."
   
   
5. Reconnect the system to the electrical outlet, and turn on the system.
   
   

System Board

CAUTION: See your Product Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge.

CAUTION: The heat sink can get hot during operation. To avoid burns, ensure that the system has sufficient time to cool before removing the system board.

The system board and system board tray are removed and replaced as a single assembly.

Removing the System Board

1. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet.
   
   
2. Open the system. See "Opening the System" in "Troubleshooting Your System."
   
   
3. Disconnect the following cables from the system board. See Figure A-3 in "Jumpers and Connectors":
   
   
   • Two power-supply cables from the POWER connectors
     
     
   • If applicable, diskette data cable from the FLOPPY connector
     
     
   • I/O panel cable from the FRONT PANEL connector
     
     
   • 5.25-inch device data cable from PRI IDE connector
     
     
   • Cooling fan from the CPU_FAN connector
     
     
   • If applicable, SATA hard-drive data cable(s) from SATA0 and SATA1 connector(s)
     
     
4. Remove all expansion cards and any attached cables. See "Removing an Expansion Card" in "Installing System Components."
   
   
5. Remove all memory modules. See "Removing a Memory Module" in "Installing System Components."
   
   

NOTE: Record the memory-module socket locations to ensure proper reinstallation of the memory modules.

NOTICE: The processor and heat sink can become extremely hot. Allow sufficient time for the processor and heat sink to cool before handling.

NOTICE: To prevent damaging the processor, do not pry the processor off the heat sink.

NOTICE: Use caution when removing and installing the processor. Bending or damaging the processor socket pins will permanently damage the system board.

6. Remove the processor. See "Replacing the Processor" in "Installing System Components."
   
   
7. Using a #2 Phillips screwdriver, remove the captive screw that secures the system board tray to the chassis. See Figure C-5.
   
   

Figure C-5. Removing and Installing the System Board

8. While pulling up on the system board tray release tab, slide the tray toward the front of the system and then remove the system board tray from the system.
   
   
9. Place the system board tray on a flat nonconductive surface.
   
   

Installing the System Board

1. While lowering the system board into the chassis, align the I/O connectors with the opening in the back panel.
   
   
2. Slide the system board backward until the system board snaps into place.
   
   
3. Using a #2 Phillips screwdriver, install the screw that secures the system board tray to the chassis. See Figure C-5.
   
   

NOTICE: To prevent damaging the processor, clean the heat sink to remove any thermal grease and then apply fresh thermal grease to the processor before installing the heat sink.

4. Install the processor. See "Replacing the Processor" in "Installing System Components."
   
   
5. Install the memory modules in the same sockets that they were removed from. See "Installing a Memory Module" in "Installing System Components."
   
   
6. Install the expansion cards and connect any cables. See "Installing an Expansion Card" in "Installing System Components."
   
   
7. Connect the following cables to the system board. See Figure A-3 in "Jumpers and Connectors":
   
   
   • Two power-supply cables from the POWER connectors
     
     
   • If applicable, diskette data cable from the FLOPPY connector
     
     
   • I/O panel cable from the FRONT PANEL connector
     
     
   • 5.25-inch device data cable from PRI IDE connector
     
     
   • Cooling fan from the CPU_FAN connector
     
     
   • If applicable, SATA hard-drive data cable(s) from SATA0 and SATA1 connector(s)
     
     
8. Close the system. See "Closing the System" in "Troubleshootng Your System."
   
   
9. Reconnect the system to the electrical outlet, and turn on the system.
   
   

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