Removing the chassis midplane

(Trained service technician only) Use these instructions to remove the chassis midplane from the NeXtScale n1200 Enclosure.

Before you remove the chassis midplane, complete the following steps:

Read Safety and Installation guidelines
Record the machine type model, the chassis serial number, and retrieve the existing universally unique identifier (UUID) information from the chassis midplane that you are removing. The procedure for obtaining this data might require different steps depending on the functional state of the chassis.
1. Chassis is operating:
  1. Log onto the IMM2 and access the command-line interface (CLI). You can access the IMM2 CLI through a direct serial or Ethernet connection to the IMM2, through a Telnet connection to the IP address of the IMM2, or through a Secure Shell (SSH) connection to the IMM2. You must authenticate with the IMM2 before issuing commands.
  2. Query for the machine type model, chassis serial number, and the UUID values by using the CLI info command. Record this information before you proceed.
2. Chassis is not operating:
  1. Obtain the chassis serial number and the machine type model from one of the chassis labels. Use this information to query the PSG Entitlement Warehouse for the UUID.
  2. Record the chassis serial number, the machine type model, and the UUID before you proceed.
Shut down the operating systems and turn off any compute nodes in the chassis. See the documentation that comes with the compute node for detailed instructions.
Open the release handles on the compute nodes and the management node, if one is installed, to disengage the nodes from the chassis midplane connectors.
Disconnect the chassis from power.
Disconnect all cables from the modules in the rear of the chassis.
Remove the components from rear and front of the chassis.

To remove the chassis midplane, complete the following steps.

Remove the compute nodes in the front of the chassis.
Remove all EMC shields on both sides.
Figure 1. Upper EMC shields removal

Figure 2. Lower EMC shields removal
Remove manifold retention brackets that are retaining manifolds (top enclosure position only).
Figure 3. Retention bracket removal
Push the latch up upwards and slide the drip sensor assembly backwards, then; lift the drip sensor assembly up to clear sensor post and pull it out of the enclosure.
Figure 4. Drip sensor assembly removal
Remove FPC card module and FPC card module support bracket.
Figure 5. FPC card module removal

Figure 6. Support bracket removal
Remove the blank filler.
Figure 7. Blank filler removal
Remove all power supplies from the enclosure.
Figure 8. Hot-swap power supply removal
Remove eight screws (using the screwdriver contained in the manifold repair kit) to loosen two manifolds from the enclosure.
Figure 9. Manifold screw locations

Table 1. Manifold screw locations
1 Screws 2 Manifold
Remove eight screws to remove two support brackets on both sides.
Figure 10. Support bracket removal
Remove two EIA covers at the front of the enclosure, then, remove eight screws.
Figure 11. EIA cover removal
Slide the enclosure out of the rack.
Figure 12. Sliding the enclosure
Loosen the three captive screws on the top cover.
Rotate the top cover outwards.
Figure 13. Top cover outward rotation
Loosen the three captive screws that secure the chassis midplane to the chassis.
Lift up the chassis midplane half way. Put a screwdriver or a stick in the middle of the chassis midplane so your hands are free.
Figure 14. Removal of the chassis midplane from a chassis
Unplug the two fan cables on chassis midplane
Carefully grasp the chassis midplane and slide it away from the chassis.
Note
Make sure that you do not grasp the connectors on the chassis midplane. You could damage the connectors.
Figure 15. Removal of the chassis midplane from a chassis

Table 1. Manifold screw locations
`1` Screws	`2` Manifold

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