Replacing the SAN Volume Controller 2145-8G4 microprocessor

This topic describes how to replace the microprocessor.

There are two versions of the SAN Volume Controller 2145-8G4 node: Rev 1 and Rev 2. One difference between these two versions is in the processor configuration. The original version (Rev 1) has two microprocessors, while the second version (Rev 2) has one microprocessor. The label on the Rev 1 node does not include a version number. An additional label on the front of the Rev 2 node includes the version number. Ensure that you have the correct microprocessor for the node that you are servicing.

You need 1 alcohol wipe and 1 thermal grease syringe for each microprocessor that you will replace. If you do not already have these, order them before you begin to replace the part.

The documented steps to replace the SAN Volume Controller 2145-8G4 microprocessor assume that you:
  • Removed all power from the node
  • Removed the node from the rack
  • Removed the top cover of the node
  • Removed the microprocessor that is being replaced
Perform the following steps to replace the microprocessor:
  1. Rotate the release lever from the closed and locked position to the open position.
  2. Touch the static-protective package that contains the new microprocessor to any unpainted metal surface on the node.
  3. Remove the microprocessor from the package.
    Attention: Be careful how you handle the microprocessor. Do not touch the microprocessor contacts; handle the microprocessor by the edges only. Dropping the microprocessor during installation or removal can damage the contacts. Also, contaminants on the microprocessor contacts, such as oil from your skin, can cause connection failures between the contacts and the socket.
  4. Position the microprocessor reference key one over the microprocessor socket, as shown in Figure 1. Use the triangular alignment cutout on the microprocessor socket and the triangular alignment mark reference key two on the microprocessor to assist you in aligning the microprocessor to the socket. Then, carefully place the microprocessor onto the socket. Do not force the microprocessor. It only fits one way onto the socket.
    Figure 1. Aligning the microprocessor with the socketThis figure shows how to align the microprocessor with the socket
    • reference key one Microprocessor
    • reference key two Alignment marks
    • reference key three Microprocessor release lever
    • reference key four Microprocessor bracket frame
  5. Place the microprocessor bracket frame reference key four down over the microprocessor and the microprocessor socket to secure the microprocessor position in the socket.
  6. Rotate the microprocessor release lever reference key three into a closed position.
  7. Place the heat sink reference key one on top of the microprocessor reference key three with the thermal grease reference key two side down, as shown in Figure 2. Tighten the captive screws to secure the heat sink to the system board. Alternate among the screws on either side of the heat sink until they are snug, and then alternate again until they are tight, making sure that you do not overtighten any of them.
    Attention: If you are working on a Rev 1 node, do not touch the thermal grease on the bottom of the heat sink after you remove the plastic cover. Touching the thermal grease contaminates it.
    Figure 2. Installing the heat sinkThis figure shows how to install the heat sink
    • reference key one Heat sink
    • reference key two Thermal grease
    • reference key three Microprocessor
    • reference key four Heat sink installation label
  8. Replace the top cover. See Replacing the top cover.
  9. Place the node in the rack. See Replacing the SAN Volume Controller in a rack.
  10. Reconnect the power cable and any other cables that were removed.
  11. Turn on the node.
Parent topic: Replacing the microprocessor
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