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Dell™ PowerEdge™ 400SC Systems Service Manual

  Before You Begin

  I/O Panel

  Control Panel

  Chassis-Intrusion Switch

  Power Supply

  System Board

Before You Begin

The procedures in this guide require that you remove the cover and work inside the system. While working inside the system, do not attempt to service the system except as explained in this manual and elsewhere in the system documentation. Always follow the instructions closely and review all of the procedures in "Safety Instructions" in the System Information Guide.

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

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

• You have read the safety information in your System Information Guide.
  
  
• You have opened the system cover.
  
  

When there is no replacement procedure provided, use the removal procedure in reverse order to install the replacement part.

NOTE: To remove or replace all other components in your system, see the system Installation and Troubleshooting Guide.

Recommended Tools

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

• Key to the system keylock
  
  
• Wrist grounding strap
  
  
• Small flat-blade screwdriver
  
  
• An 8-inch, #2 Phillips-head screwdriver
  
  
• #1 and #2 Phillips-head screwdrivers
  
  

I/O Panel

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

1. Disconnect all cables connected to the I/O panel. See Figure 1.
   
   

Figure 1. Removing the I/O Panel

2. Remove the mounting screw that secures the I/O panel to the system. See Figure 1.
   
   
3. Remove the I/O panel from the system See Figure 1.
   
   

When installing the new I/O panel, note the proper locations of the cables. See Figure 2.

Figure 2. I/O Panel Cable Connectors

Control Panel

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

1. Remove the front bezel:
   
   
   1. Temporarily remove any drives in the optical drive bay.
      
      
   2. Press and release the three tabs securing the lower edge of the bezel to the chassis.
      
      

One tab is located inside the optical drive bay near the system cover hinge, and two tabs are located near the I/O panel. See Figure 3.

3. Pull the lower edge of the bezel away from the chassis, and then remove the bezel.
   
   

Figure 3. Removing the Front Bezel

2. Disconnect the control-panel cable from the control panel. See Figure 4.
   
   

Figure 4. Removing the Control Panel

3. Remove the mounting screw from the control panel. See Figure 4.
   
   
4. Lift the control panel away from the system. See Figure 4.
   
   

Chassis-Intrusion Switch

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

1. Disconnect the chassis-intrusion switch cable from the I/O panel inside the system. See Figure 2.
   
   

Note the routing of the chassis-intrusion cable as you remove it from the chassis. Chassis hooks may hold the cable in place inside the chassis.

2. Slide the chassis-intrusion switch out of its slot, and remove the switch and its attached cable from the system. See Figure 5.
   
   

Figure 5. Removing the Chassis-Intrusion Switch

3. Slide the new chassis-intrusion switch into its slot and reconnect the cable to the connector on the I/O panel. See Figure 2.
   
   

Resetting the Chassis-Intrusion Detector

1. Enter the System Setup program by pressing <F2> during POST.
   
   

NOTE: For instructions on using the System Setup program, see the system User's Guide.

2. On the System Security tab, reset the Chassis Intrusion option by pressing the left- or right-arrow key to select Reset and changing the setting to Enabled, Enabled-Silent, or Disabled.
   
   

NOTE: The default is Enabled-Silent.

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

3. Press <Alt><b> to restart the system and implement your changes.
   
   

Power Supply

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

1. Disconnect the DC power cables from the system board (see "Jumpers and Connectors" in the system Installation and Troubleshooting Guide) and from the drives.
   
   
2. Remove the two screws securing the power supply to the back panel. See Figure 6.
   
   

Figure 6. Removing the Power Supply

3. Press the release button located on the floor of the chassis. See Figure 6.
   
   
4. Slide the power supply toward the front of the system approximately 2 cm (1 inch).
   
   
5. Lift the power supply up and out of the system.
   
   

System Board

CAUTION: See the System 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.

NOTICE: The system board and metal tray are connected and are removed as one piece.

Removing the System Board

1. Remove any components that restrict access to the system board.
   
   
2. Disconnect all cables from the system board.
   
   
3. Before you remove the existing system board, visually compare the replacement system board to the existing system board to ensure that you have the correct part.
   
   
4. Pull up on the tab, slide the system board toward the front of the system, and then lift the system board out of the chassis. See Figure 7.
   
   

Figure 7. Removing the System Board

5. Place the system board that you just removed next to the replacement system board.
   
   

Replacing the System Board

1. Transfer components from the removed system board to the replacement system board:
   
   
   1. Remove the memory modules and install them on the replacement system board.
      
      
   2. Remove the heat sink and processor from the removed system board and transfer them to the replacement system board.
      
      
2. Configure the settings of the replacement system board.
   
   
3. Set the jumpers on the replacement system board so that they are identical to the ones on the removed board.
   
   

See "Jumpers and Connectors" in the system Installation and Troubleshooting Guide.

NOTE: Some components and connectors on the replacement system board may be in different locations than the corresponding connectors on the removed system board.

4. Orient the replacement system board by aligning the notches on the bottom of the board with the tabs on the system.
   
   
5. Slide the system board toward the back of the system until the board clicks into position.
   
   
6. Reconnect the cables to the system board.
   
   

To confirm the location and function of the connectors on the system board, see "Jumpers and Connectors" in the system Installation and Troubleshooting Guide.

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