3.13.1 Before You Begin

Use an antistatic mat when working with the main logic board. An antistatic mat provides the cushioning required to protect under the board, to prevent the main logic board from flexing, and to provide antistatic protection.

Perform this procedure on a workbench. Sun Microsystems does not support changing the main logic board while the system is installed in a rack.

The NVRAM/TOD module contains the system host identification (ID) and Ethernet address. You can migrate your NVRAM/TOD module from your old board to preserve your host ID and Ethernet address. However, if you are replacing the NVRAM/TOD module and want to retain the same host ID and Ethernet address on the new main logic board, consult your authorized Sun sales representative or service provider.

Before you remove the main logic board, you must remove all removable components from it. You can then transfer the components to the new main logic board after you install it. Complete these tasks to remove the necessary components:

• "2.1 How to Power Off the System"

• "2.14 How to Remove the System From the Rack"

• "2.6 How to Remove the System Cover"

• "2.8 How to Avoid Electrostatic Discharge"

• "3.1 How to Remove a Memory Module"

• "3.3 How to Remove a PCI Card"

• "3.7 How to Remove the NVRAM/TOD Module"

• "3.5 How to Remove a CPU Module"

• "3.9 How to Remove the Air Guide"

• "3.11 How to Remove the CPU Card Cage Assembly"

Do not attempt to remove components from the board after it has been removed from the system. Doing so can damage the main logic board.