Exchange the I/O enclosure backplane assembly

Before you begin

CAUTION:

This assembly contains mechanical moving parts. Use care when you service this assembly. (C025)

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 a 5-mm socket to remove the 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.
The management console keyboard can be moved between the operating and stowed position as needed to allow service clearance at the front of the I/O enclosure.

If you are repairing I/O enclosure 1B3 or 1B4 in a model 984, 985, 986, or 988, confirm that redundant PJA power is available.

If you are repairing an enclosure other than 1B3 or 1B4, or an enclosure in models other than 984, 985, 986, or 988, continue to step 5.

If you are repairing enclosure 1B3 or 1B4 in models 984, 985, 986, or 988, at the rear of the rack, check all LEDs on the partner PJA. Confirm that the green LEDs are lit for all ports on the partner PJA. See Table 1.

Attention:

Performing this repair on the models that are listed removes power to one PJA. If the partner PJA is not fully operational, power might be lost to the Ethernet switches, management consoles, or management console display.

Table 1. Partner PJAs for I/O enclosure repair
I/O enclosure to repair	Provides power to PJA	Partner PJA to check
U1500.1B3.`sssssss`-P1 (R1-XI3)	E42	E41
U1500.1B4.`sssssss`-P1 (R1-XI4)	E41	E42

Are all port LEDs lit on the partner PJA?
- Yes, continue with the next step.
- No, stop this repair. Correct the problem with the partner PJA before you continue this procedure.

At the front of the rack, for the I/O enclosure that is being repaired, unplug the power input cable from power supplies E1 and E2. See Figure 1.
Figure 1. I/O enclosure locations (front) (models 98x, 8xE)
Remove both power supplies and the air baffle between them.
1. Push the orange release button beneath the input power connector. See Figure 1.
2. Pull the power supply straight out from the I/O enclosure.
3. After both power supplies are removed, remove the air baffle.
  Note: If the air baffle is secured by a captive screw, loosen the screw. It is not necessary to fasten the screw when the baffle is installed.
Remove both fan assemblies. See Figure 1.
1. Unlatch the fan release lever at the upper right corner of the fan. Then, use it to pull the fan assembly straight out from the I/O enclosure.
At the rear of the rack, unlatch and pull out the I/O enclosure PCIe and PCN card C7 about 2.5 cm or 1 inch. See Figure 2.
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 make it easier to slide the I/O enclosure planar assembly out the front later in this procedure.
Figure 2. I/O enclosure locations (rear) (models 98x, 8xE)
Notes:
- I/O enclosure PCIe storage interface card (locations C3 and C6) not shown.
- The older generation I/O enclosure PCIe and PCN card might not include T3, T4, and T10 ports.
Unlatch and slide each device adapter card and host adapter card out about 2.5 cm or 1 inch. Leave the cables attached. See Figure 3 (device adapter shown; host adapter similar).

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

Figure 3. 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. The thumbscrews are accessed through a bulkhead that opens behind the power supply baffle you removed earlier.
2. Reach through the opening and unscrew the two thumbscrews. They are captive and do not fall off. See Figure 4.
Figure 4. I/O enclosure backplane screws
At the front of the rack, remove the I/O enclosure backplane retaining screws . See Figure 5.

Figure 5. I/O enclosure retaining screws
Use the brackets to pull out the planar assembly. See Figure 6.

Note: The rubber air seals can make the planar assembly hard to pull out.

Figure 6. 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 the two brackets , as shown in Figure 6.
Reach through the bulkhead opening behind the power supply baffle and fasten the two thumbscrews.
Install the I/O enclosure backplane retaining screws. See Figure 5.
Install the power supply baffle between the two power supply locations.
Note: If the air baffle includes a captive screw, it is not necessary to fasten the screw.
Install the two power supplies. Do not connect the power cables now. Ensure that the orange latch beneath the input power connector is secure.
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 and PCN card.

Connect any cables that are disconnected from the PCIe and PCN 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.