Remove the power distribution board

Use this information to remove the power distribution board.

About this task

S001

DANGER

danger

Electrical current from power, telephone, and communication cables is hazardous.

To avoid a shock hazard:

• Connect all power cords to a properly wired and grounded electrical outlet/source.
• Connect any equipment that will be attached to this product to properly wired outlets/sources.
• When possible, use one hand only to connect or disconnect signal cables.
• Never turn on any equipment when there is evidence of fire, water, or structural damage.
• The device might have more than one power cord, to remove all electrical current from the device, ensure that all power cords are disconnected from the power source.

Attention

• Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.

• Turn off the corresponding DWC tray that you are going to perform the task on.

• Disconnect all external cables from the enclosure.

• Use extra force to disconnect QSFP cables if they are connected to the solution.

• To avoid damaging the water loop, always use the water loop carrier when removing, installing or folding the water loop.

Prepare the following screwdrivers to ensure you can install and remove corresponding screws properly.

Screwdriver Type	Screw Type
Torx T10 head screwdriver	Torx T10 screw
Torx T30 head screwdriver	Torx T30 screw
Phillips #1 head screwdriver	Phillips #1 screw
Phillips #2 head screwdriver	Phillips #2 screw

Watch the procedure

• A video of this procedure is available at YouTube.

Procedure

1. Make preparations for this task.
   1. Remove the tray from the enclosure. See Remove a DWC tray from the enclosure.
   2. Remove the tray cover. See Remove the tray cover.
   3. Remove the cross braces. See Remove the cross braces (SD650 V3).
2. Remove two Torx T10 screws (per node); then, remove the VR (voltage regulator) clamp plate out of the node.
   Figure 1. VR clamp plate removal
   
   
3. Remove water loop screws (9x Torx T10 screws per node) with a torque screwdriver set to the proper torque.
   Note

   For reference, the torque required for the screws to be fully tightened/removed is 5.0+/- 0.5 lbf-in, 0.55+/- 0.05 N-M.

   Figure 2. Water loop screw removal
   
   
4. Remove the following screws to loosen the quick connect.

   • Two Torx T10 screws (per node) on the quick connect.

   • Five Torx T10 screws (per node) on the rear of the node.

   Figure 3. Quick connect screw removal
   
   
5. Orient the water loop carrier with the guide pin; then, gently put the water loop carrier down and ensure it is seated firmly on the water loop.
   Figure 4. Water loop carrier installation
   
   
6. Tighten water loop carrier screws (12x Phillips #2 screws per node).
   Figure 5. Water loop carrier screws installation
   
   
7. Loosen processors properly.

   1. Fully loosen all Torx T30 captive screws (8x Torx T30 captive screws per node) on cold plates with a general screwdriver until they stop, following the removal sequence shown on the cold plate label.

      Note

      For reference, the torque required for the screws to be fully tightened/removed is 10+/- 2.0 lbf-in, 1.1+/- 0.2 N-m.

      Attention

      To prevent damage to components, make sure that you follow the indicated loosening sequence.

   2. Rotate all anti-tilt wire bails (8x anti-tilt wire bails per node) inwards to the unlocked position.

   Figure 6. Loosening processors
   
   
8. Carefully rotate the water loop so one half is sitting on top of the other half.
   Figure 7. Folding the water loop
   
   
9. Remove the power distribution board.
   1. Remove the five Phillips #1 screws (per node).
   2. Gently pull the power distribution board connector to disconnect it from the system board.
   3. Carefully pull the power distribution board inwards to disengage it from the node.
   Note

   Use a 3/16" hex head screwdriver to ensure the proper removal and installation.

   Figure 8. Power distribution board removal