5.6 Replacing the Power Board

To remove the power board, you must remove the following components as part of preparing the server for power board replacement:

• Memory mezzanine (see Remove the Memory Mezzanine Assembly)

• PCI mezzanine (see Remove the PCI Mezzanine Assembly)

• System Fan 0 (see Remove the System Fan Assembly (Fan Tray 0))

• Optical media drive (see Remove the Optical Media Drive)

• Motherboard (see Remove the Motherboard Assembly)

Remove the Power Board

1. Prepare the server for power board removal. See:
   • Power Off the Server
   • Disconnect Cables From the Server
   • Remove the Server From the Rack
   • Perform Antistatic Measures
   • Remove the Top Cover
2. Perform the removal instructions in the following sections:
   • Remove the Memory Mezzanine Assembly
   • Remove the PCI Mezzanine Assembly
   • Remove the System Fan Assembly (Fan Tray 0)
   • Remove the Optical Media Drive
   • Remove the Motherboard Assembly
3. Remove the screws that secure the power board to the chassis (Removing the Power Board Screws).
   

   Figure 5-11 Removing the Power Board Screws

   
4. Lift the power board out of the chassis, and set it aside on an antistatic mat.
5. Continue to Install the Power Board.

Install the Power Board

1. Remove the replacement power board from its packaging and place it on an antistatic mat.
2. Lower the power board into the chassis, aligning the board’s holes with the standoffs in the chassis.
3. Install the screws firmly to secure the power board to the chassis.
4. Perform the installation instructions in the following sections:
   • Install the Motherboard Assembly
   • Install the System Fan Assembly (Fan Tray 0)
   • Install the Optical Media Drive
   • Install the PCI Mezzanine Assembly
   • Install the Memory Mezzanine Assembly
5. See Chapter 6, Returning the Server to Operation to perform the tasks needed to bring the server back online.

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   Note - After replacing the power distribution board and powering on the system, you must run the ALOM CMT setcsn and setcpn commands to set the electronically readable chassis serial number and server part number.

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6. At the ALOM CMT command line interface, use the setcsn command to set the chassis serial number and the setcpn command to set the server part number on the power distribution board.

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   Caution - When performing the following steps, use special care to enter the correct numbers. Once the power distribution board has been programmed with a chassis serial number or server part number, the number cannot be changed.

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   sc> setsc sc_servicemode true
   Warning: misuse of this mode may invalidate your warranty.
   sc> setcsn -c chassis_serial_number
   Are you sure you want to permanently set the Chassis Serial Number
   to chassis_serial_number [y/n]? y
   setcsn: Chassis serial number recorded.
   sc> setcpn -p chassis_part_number
   Are you sure you want to permanently set the Chassis Part Number
   to chassis_part_number [y/n]? y
   setcpn: Chassis part number recorded.
   sc> showplatform
   Sun-Netra-T5440
   Chassis Serial Number: chassis_serial_number
   Domain Status
   ------ ------
   SO Running
   sc> setsc sc_servicemode false