Install the bus bars

Use this information to install the bus bars.

Procedure

1. Make preparations for this task.
   1. Remove the tray cover. See Remove the tray cover.
   2. Remove the cross bar. See Remove the cross bar.
2. Make the following components are installed.
   1. Install the system I/O board. See Install the system I/O board (DCSCM).
   2. Install the host board. See Install the host board.
   3. (Optional) Install the E3.S switch board. See Install the E3.S switch board.
   4. Install the GB200-NVL4 board. See Install the GB200-NVL4 board.
   5. Complete cable routing for GB200-NVL4–host board connection, power interposer board sideband cable, and HSC sideband control cable. See Internal cable routing.
   6. Install the CX8 mezzanine module or the MCIO breakout board. See Install a CX8 mezzanine module or Install the MCIO breakout board.
3. Installing side bus bar.
   1. Align the side bus bar with the screw holes on the tray; then, install it to the tray.
   2. Install three screws to secure the bus bar to the tray.
   3. Install four thumb screws to secure the bus bar to the host board.
   Figure 1. Screw holes for side bus bar
   
   

   Figure 2. Installing the side bus bar
   
   

   Figure 3. Installing screws to secure the side bus bar
   
   
4. Installing the GB200-NVL4 board bus bars.
   1. Align the two bus bars to the screw hole on the GB200-NVL4 boards; then, install the bus bars to the tray.
   2. Install eight thumb screws to secure the bus bars to the GB200-NVL4 boards.
   3. Install three screws to secure the bus bars to the GB200-NVL4 boards.

   1

   2

   Figure 4. Screw holes for GB200-NVL4 bus bars
   
   

   Figure 5. Installing GB200-NVL4 bus bars
   
   

   Figure 6. Installing screws to secure the bus bars
   
   
5. Installing middle bus bars.
   1. Align the bus bars to the screw holes on the right-side GB200-NVL4 board and the host board.
   2. Make sure the black bus bars and red bus bars are arranged as illustrated.
      Figure 7. Installing middle bus bars
      
      

      Figure 8. Black and red bus bars placement rule
      
      
   3. Install eight screws to secure the bus bars to the right-side GB200-NVL4 board.
   4. Install eight screws to secure the bus bars to the host board.
   Figure 9. Installing screws to secure the bus bar