Removing and replacing the base assembly

Use this information to remove and replace the base assembly.

To remove and replace the base assembly, complete the following steps:

1. Remove any storage drives, optional drive components, and hard disk drive bay fillers from the defective based assembly and set them aside on a static-protective surface. (see Removing a hot-swap hard disk drive).
2. Remove the bezel from the defective base assembly and immediately install it on the replacement base assembly (see Removing the bezel and Installing the bezel).
   Note: If your compute node has an RFID tag, it is already attached to the bezel.
3. Remove the covers from both compute nodes (see Removing the compute node cover). Keep the cover that comes with the replacement base assembly for reference and re-install it on the defective base assembly prior to returning the defective base assembly.
4. Remove hard disk drive backplane from the defective base assembly and immediately install it in the replacement base assembly (see Removing the hard disk drive backplane and Installing the hard disk drive backplane).
   Note: Install the storage drives in the same bay locations from which they were removed.
5. Install any removed storage drives, optional drive components, and hard disk drive bay fillers into the replacement base assembly (see Installing a hot-swap hard disk drive).
6. Remove the DIMM air baffles from defective base assembly and set them aside.
   Attention:

   • Remove and install only one microprocessor at a time.
   • When removing or installing a microprocessor, protect the other microprocessor socket with a microprocessor heat sink filler.
   • When transferring a microprocessor to a replacement base assembly, install the microprocessor heat sink filler in the defective base assembly immediately after installing the microprocessor in the replacement base assembly.
7. Transfer microprocessor 1 (left rear microprocessor) and its heat sink from the defective base assembly to the replacement base assembly. Use the microprocessor installation tool that comes with the replacement base assembly to remove the microprocessor from the defective base assembly and install it immediately in the replacement base assembly.
   1. Use a screwdriver to loosen the screw on one side of the heat sink to break the seal with the microprocessor.
   2. Use a screwdriver to loosen the screws on the heat sink, rotating each screw two full turns until each screw is loose.
   3. Gently pull the heat sink from the microprocessor.
      Attention: Do not touch the thermal material on the bottom of the heat sink. Touching the thermal material will contaminate it.
   4. Identify which release lever is labeled as the first release lever to open, and open it.
      Attention: Do not use any tools or sharp objects to lift the release levers on the microprocessor socket. Doing so might result in permanent damage to the system board.

      
      
      
   5. Open the second release lever on the microprocessor socket.
   6. Open the microprocessor retainer.
   7. Select the empty installation tool and ensure that the handle is in the open position. If the installation tool handle is not in the open position, use the following instructions for your installation tool:
      • If using Installation Tool A, twist the microprocessor installation tool handle counterclockwise to the open position.
      • If using Installation Tool B, 1) lift the interlock latch and hold it up while you 2) twist the microprocessor installation tool handle counterclockwise to the open position, and then release the interlock latch. The following illustration of the installation tool shows the location of the interlock latch and counterclockwise rotation of the handle before loading the microprocessor.

      
      
      
   8. Align the installation tool with the screws, as shown in the following graphic, and lower the installation tool on the microprocessor. The installation tool rests flush on the socket only when it is aligned correctly.
      
      
      
   9. Using the following instructions for your installation tool, remove the microprocessor.
      • If using Installation Tool A, gently twist the handle clockwise to the closed position and lift the microprocessor out of the socket.
      • If using Installation Tool B, gently twist the handle of the installation tool clockwise until it locks in the "H" or "L" position, depending on the size of microprocessor, and then lift the microprocessor out of the socket.

      
      
      

      Attention: Do not touch the connectors on the microprocessor and the microprocessor socket.
   10. Open the packaging that contains the new microprocessor installation tool assembly and carefully remove the installation tool assembly from the package.
       Note: Do not touch the microprocessor contacts. Contaminants on the microprocessor contacts, such as oil from your skin, can cause connection failures between the contacts and the socket.
   11. Remove the microprocessor protective cover if one is present.
       
       
       
   12. Align the installation tool with the microprocessor socket. The installation tool rests flush on the socket only if it is properly aligned.
       
       
       
   13. Install the microprocessor using the following instructions for your installation tool.
       • If using Installation Tool A, twist the handle on the microprocessor tool assembly counterclockwise to the open position to insert the microprocessor into the socket, and lift the installation tool out of the socket.
       • If using Installation Tool B, twist the handle of the installation tool assembly counterclockwise until the microprocessor is inserted into the socket, and lift the installation tool out of the socket. The following illustration shows the tool handle in the open position.
         
         
       Attention:

       • Do not press the microprocessor into the socket.
       • Make sure that the microprocessor is aligned correctly in the socket before you try to close the microprocessor retainer.
       • Do not touch the thermal grease on the bottom of the heat sink or on top of the microprocessor. Touching the thermal grease will contaminate it.
       
       
       
   14. Close the microprocessor retainer on the microprocessor socket.
   15. Identify which release lever is labeled as the first release lever to close, and close it.
   16. Close the second release lever on the microprocessor socket.
       Attention:

       • If you are installing a new heat sink, do not set down the heat sink after you remove the plastic cover.
       • Do not touch the thermal material on the bottom of the heat sink. Touching the thermal material will contaminate it.
8. Repeat step 8 for microprocessors 2, 3 and 4, if installed.
9. Remove all of the installed components in the following list from the defective base assembly; then, immediately install them on the replacement base assembly:
   • DIMMs. See Removing a DIMM and Installing a DIMM.
   • Fabric connector. See Removing a fabric connector and Installing a fabric connector.
   • I/O expansion adapters. See Removing an I/O expansion adapter and Installing an I/O expansion adapter.
10. Install the DIMM air baffles in the replacement base assembly. The DIMM air baffles are required to maintain system cooling.
    Note: Retaining clips on the DIMM connectors must be in the closed position to install the air baffles.
11. Install the cover that you removed from the original (defective) base assembly onto the replacement base assembly (see Installing the compute node cover for instructions).
    Important: The heat sink fillers protect the microprocessor sockets from potential damage during shipping.
12. Make sure that all four microprocessor sockets on defective base assembly have heat sink fillers installed; then, install the cover that came with the replacement base assembly onto the defective base assembly (see Installing the compute node cover for instructions).
    Note: Retention clips that secure the I/O expansion adapters must be in the closed position to install the cover.
13. The new base assembly comes with a Repair Identification (RID) tag. Using a ball point pen, transfer the machine type and serial number from the old base assembly to the two labels on the Repair Identification tag; then, place Tag 1 on the label tab (see Installing a compute node in a chassis) and Tag 2 on the bottom of the compute node. If you installed the new bezel on the new base assembly because the old bezel was damaged and did not transfer the Tag from the old bezel to the new bezel, install Tag 3 on the lower right corner of the new bezel. If you installed the old bezel on the new base assembly or transferred the Tag from the old bezel to the new bezel, discard Tag 3.