Exchange the I/O enclosure backplane assembly

Before you begin

Icon for electrostatic discharge wrist strap Use approved ESD procedures to prevent damage.

Attention:

This procedure is not a stand-alone procedure. Customer disruption and damage to the hardware might occur when microcode and power boundaries are not in the proper conditions for this service action.
If a serviceable event FRU repair directed you to this procedure, the microcode and power boundaries are already set.
If a serviceable event FRU repair did not direct you to this procedure, see MAP1230 Replace a FRU without using a serviceable event.

Notes:

All the cables and FRUs to be removed must be uniquely identified so they can be reinstalled correctly.
If an installed earthquake resistance kit prevents you from accessing this FRU, refer to MAP1600.

About this task

Note: The I/O enclosure must be fully removed from the rack for this procedure.

Remove the I/O enclosure backplane assembly

Before you begin

Note: You need 5.5 mm and 8 mm sockets to remove hex head screws for this FRU.

Procedure

To locate this FRU, take one of the following actions and then return here and continue to replace the FRU:
- If this FRU has a FRU identify indicator, use the FRU identify indicator, which is listed in MAP1240 Locating FRUs by using identify indicators. If not, use the location code.
  Note: There might be cases where the FRU failure or fencing conditions prevent the FRU LED indicator from being lit even if the FRU has power.
- Use the location code, which is listed in MAP1245 Finding FRUs by using location codes.
- If there is no FRU identify indicator or location code, you were sent here by an isolation MAP or symbolic FRU procedure. Use the information in that procedure and the figures in this procedure to locate the proper part to exchange.
Most, but not all, FRUs have identify indicators. Use the flashing amber or solid blue FRU identify indicators to ensure that you are working on the correct enclosure or FRU.
- The light path identify LEDs are a hierarchy of LEDs that can identify the rack, enclosure, FRU, and even the FRU connector to which a cable is connected.
- For more information, refer to MAP1240 Locating FRUs by using identify indicators.
At the front of the rack, for the I/O enclosure being repaired, unplug the power input cable to each power supply. See Figure 1.
Figure 1. I/O enclosure power supply, input power connectors
Remove both power supplies.
1. Remove the I/O power supply retention bracket by removing the screws on either side of the bracket . See Figure 2.
  Figure 2. I/O enclosure power supply retention bracket
2. Push down on the red release button beneath the input power connector. See Figure 3.
  Figure 3. I/O enclosure power supply, input power connector release button
3. Pull the power supply straight out from the I/O enclosure.
Remove both fan assemblies. See Figure 4.
1. Unlatch the orange fan release lever in the upper right corner of the fan. Then, use it to pull the fan assembly straight out from the I/O enclosure.
  Figure 4. Removing the I/O enclosure fan
At the rear of the rack, unlatch and pull the I/O enclosure PCIe / SPCN card out about 2.5 cm or 1 inch. See Figure 5.
You can leave the cables attached but you might need to unplug one or more cables to gain access to the blue lever latch.

Note: Undocking these cards will make it easier to slide the I/O enclosure planar assembly out the front later in this procedure.

Figure 5. PCIe / SPCN card latch
Unlatch , as shown in Figure 6 (Model 941) and Figure 7 (Model 951), and slide each device adapter card and host adapter card out about 2.5 cm or 1 inch. Leave the cables attached.
Note: Undocking these cards will make it easier to slide the I/O enclosure planar assembly out the front later in this procedure.

Figure 6. I/O enclosure device adapter card, copper (4-port), blue retention levers

Figure 7. I/O enclosure device adapter card, optical (4-port) blue retention levers
At the front of the rack, unscrew the two thumbscrews that fasten the planar assembly to the I/O enclosure midplane sheet metal.
1. When you removed each power supply, a sheet metal flapper door pivoted down to block off the opening.
2. Lift each door up and then reach through and unscrew the two thumbscrews. They are captive and will not fall off.
At the front of the rack, remove the hold down bracket below the affected I/O enclosure by removing the two screws at either end of the bracket. for the upper enclosures (rB1, rB2) or for the lower enclosures (rB3, rB4). See Figure 8.
Figure 8. I/O enclosure hold down brackets
Use the brackets to pull the planar assembly out. See Figure 9.
Note: The rubber air seals can make the planar assembly hard to pull out.

Figure 9. I/O enclosure backplane assembly screws and brackets details

Install the I/O enclosure backplane assembly

Procedure

At the front of the rack slide the I/O enclosure backplane assembly in by pushing on the two brackets , as shown in Figure 9.
Lift up the power supply sheet metal flapper doors and screw in the two thumbscrews.
Install the hold down bracket below the affected I/O enclosure, for the upper enclosures (rB1, rB2) or for the lower enclosures (rB3, rB4). See Figure 8.
Install the two power supplies. Ensure that the red latch beneath the input power connector is secure.
Reinstall the I/O power supply retention bracket , as shown in Figure 2.
Install and latch the two fans.
At the rear of the rack, fully install and latch the device adapter and host adapter cards.
Fully install and latch the PCIe / SPCN card.
Connect any cables disconnected from the PCIe / SPCN card.
At the front of the rack, connect the power input cable to each power supply.
Exit this service information center parts exchange procedure and return to the procedure that sent you here.