Replacing the motherboard

Open the PCB carrier by following Steps 2 through 5 of the procedure described in Opening the PCB carrier.

Note
If any motherboard failure occurs, the chassis performs a "dirty shutdown," and you cannot perform the recommended clean shutdown. However, your data from the last transaction is still buffered in the battery-backed memory on the NVRAM III adapter.

If, however, you performed a clean shutdown using the halt command, the contents of the NVRAM III battery were flushed. In this case, you can safely disconnect the battery from the NVRAM III adapter without the risk of data loss.

Remove the PCB carrier by following Steps 2 through 4 of the procedure described in Removing the PCB carrier.

Using the #0 or #1 Phillips screwdriver, remove all adapters except the NVRAM III adapter from the expansion slots on the motherboard by following Steps 2 through 6 of the procedure described in Removing an existing expansion adapter.

Set the screws and adapters aside for later use.

Using a #0 or #1 Phillips screwdriver, remove the screw securing the NVRAM III adapter to the PCB carrier.

Set the screw aside for later use.

Lift the NVRAM III adapter out of the expansion slot and carefully lay it over the side of the chassis.

This allows easy access for the removal of the NVRAM III battery.

Caution
If a dirty shutdown occurred, do not disconnect the NVRAM III battery wire from the NVRAM III adapter. This disconnection causes data loss.

Using a #0 or #1 Phillips screwdriver, loosen the two thumbscrews securing the NVRAM III battery carrier to the chassis frame.

Lift the NVRAM III battery out of the PCB carrier and place the battery and the still-connected NVRAM III adapter on the nonconductive surface.

Remove all SDRAM DIMMs by following Steps 3 through 5 of the procedure described in Removing an SDRAM DIMM.

Set the DIMMs aside for later use.

Using a 3/16-inch socket wrench, remove the four screws on the back of the chassis that secure the Console and Diagnostic ports to the chassis.

Using a #2 Phillips screwdriver, remove the 11 screws securing the motherboard to the PCB carrier.

Lift the motherboard and slide it out of the PCB carrier.

Slide the replacement motherboard into the PCB carrier and, using a #2 Phillips screwdriver, secure the motherboard to the PCB carrier with the 11 screws.

Reinstall all SDRAM DIMMs by following Steps 1 through 4 of the procedure described in Installing an SDRAM DIMM.

Without disconnecting the wire from the NVRAM III adapter, reinstall the NVRAM III battery into its place on the PCB carrier.

Note
Maintaining the connection between the NVRAM III adapter and the NVRAM III battery is necessary only if a dirty shutdown occurred.

Tighten the two thumbscrews securing the NVRAM III battery carrier to the PCB carrier.

Carefully turn over the still-connected NVRAM III adapter that is outside the chassis and reinstall it in the expansion slot.

Using the #0 or #1 Phillips screwdriver, secure the NVRAM III adapter to the PCB carrier.

Reinstall all other adapters into the expansion slots on the motherboard by following Steps 3 through 6 of the procedure described in Installing an expansion adapter.

Using a 3/16 socket wrench, connect all the screwlocks to the PCB carrier.

Paste the MAC (Media Access Control) address label provided with the replacement motherboard on the PCB carrier, as shown.

Go to Closing the PCB carrier.