Remove the Motherboard Assembly

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Caution - Some components on the motherboard might be hot. Use caution when handling the motherboard and adjacent components.

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1. Power off the system.

   Refer to Completely Power Off the System.

2. Attach an antistatic wrist strap and prepare an antistatic surface.

   Refer to Perform Static Discharge Procedures.

3. Remove the system from the rack and place it on an antistatic mat.

   This task involves removing all cables, moving the rack into maintenance position, and then removing the chassis from the rack. Refer to Remove the Chassis From the Rack.

4. Remove the top chassis cover.

   Refer to Access Internal Components.

5. Release the latches on either end of the motherboard-to-PDB cable as shown in panel 1 and disconnect the cable as shown in panel 2 of Disconnecting the Motherboard-to-PDB Cable.
   

   Figure 31 Disconnecting the Motherboard-to-PDB Cable

   
6. If you are replacing the motherboard, remove all Flash Modules (FMods) and place them on an antistatic mat, otherwise, leave the FMods installed on the board.

   If you remove the FMods from the board, note the memory configuration so that you can reinstall the FMods in the same configuration on the new motherboard.

7. Remove two cables from the backplane as shown in Removing Cables From the Backplane.
   

   Figure 32 Removing Cables From the Backplane

   
8. Using a No. 2 Phillips screwdriver, remove the four screws that secure the motherboard assembly to the bus bar as shown in panel 1 of Removing a Motherboard Assembly .

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   Note - Set the four screws aside. You must use these screws to attach the motherboard to the bus bar during installation.

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9. Loosen the green captive screw that secures the motherboard to the chassis as shown in panel 1 of Removing a Motherboard Assembly .

   The captive screw is located to the left of the bus bar screws.

10. Using the green handle, slide the motherboard toward the rear of the system and lift it out of the chassis as shown in panels 2 and 3 of Removing a Motherboard Assembly .

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    Note - When removing the motherboard, be aware of the clearance to the side of the array to avoid hitting the motherboard against it.

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    Caution - If you are removing the motherboard to access other components and will return it to the system, place it on an antistatic mat after you remove it.

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    Figure 33 Removing a Motherboard Assembly

    
11. Remove eight energy storage module power cables from the motherboard as shown in Removing the ESM Power Cables, noting their positions, and place them on an antistatic mat.

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    Note - The ESM cables fit firmly on their receptacles and, as such, can be somewhat difficult to remove. Use care when removing these cables to avoid damaging the motherboard.

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    Figure 34 Removing the ESM Power Cables