Remove the P12V middle bus bar

Use this information to remove the P12V middle bus bar.

Procedure

1. Make preparations for this task.
   1. Remove the tray from the enclosure. See Remove a tray from the enclosure.
   2. Remove the tray cover. See Remove the tray cover.
   3. Remove the cross bar. See Remove the cross bar.
2. Disconnect cables from GB200-NVL4 board, CX8 mezzanine board, and MCIO breakout board. See Internal cable routing.
3. There are two P12V middle bus bars in the tray, the left-side bus bar and right-side bus bar. Remove and loosen the screws from the bus bar according to the table below. Decide which bus bar is to be removed, and remove and loosen screws according to the table and illustration below.

   1 Right-side bus bar: 1a Remove two (2x) PH1 screws 1b Loosen four (4x) T15 thumb screws

   2 Left-side bus bar: 2a Remove one (1x) PH1 screws 2b Loosen four (4x) T15 thumb screws

   Figure 1. P12V middle bus bar screws
   
   

   Figure 2. Removing and loosening screws on the right-side bus bar
   
   

   Figure 3. Removing and loosening screws on the left-side bus bar
   
   
4. Remove the eight (8x) screws from the P12V front bus bars.
   Figure 4. Removing P12V front bus bar screws
   
   
5. Remove the P12V middle bus bars from the tray.
   1. Remove the right-side bus bar.
   2. Remove the left-side bus bar.
   Attention

   • Make sure to follow the bus bar removal sequence: Right-side bus bar > Left-side bus bar

   • Pay extra attention and care when moving the P12V middle bus bar. Make sure the bus bar does not hit the connectors on the GB200-NVL4 board.

     Figure 5. Prevent P12V middle bus bar hitting the connectors on GB200-NVL4 board
     
     

   Figure 6. Removing the right-side bus bar
   
   

   Figure 7. Removing the left-side bus bar