DS8000 Service Documentation Version 7.5

Exchange the I/O enclosure power supply to 208 VDC bus bar cable

Before you begin

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

Attention:
  • This is not a stand-alone procedure. Customer disruption and damage to the hardware might occur if microcode and power boundaries are not in the proper conditions for this service action.
  • If you were sent here by a serviceable event FRU repair, the microcode and power boundaries have already been set.
  • If you were not sent here by a serviceable event FRU repair, 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.
Related tasks:
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Remove the I/O enclosure power supply to 208 VDC bus bar cable

About this task

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

Procedure

  1. To locate this FRU, do one of the following 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 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.
  2. 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 using identify indicators.
  3. At the front of the rack, unplug the power input cable Callout label 1 to both power supplies in the I/O enclosure. See Figure 1.
    Figure 1. I/O enclosure power supply plugs
    I/O enclosure power supply plugs
  4. Remove both power supplies.
    1. Remove the I/O power supply retention bracket Callout label 1 by removing the screws on either side of the bracket Callout label 2. See Figure 2.
      Figure 2. I/O enclosure power supply retention bracket
      I/O enclosure power supply retention bracket
    2. Push down on the red release button Callout label 1 beneath the input power connector. See Figure 3.
      Figure 3. I/O enclosure power supply, input power connector release button
      I/O enclosure power supply, input power connector release button
    3. Pull the power supply straight out from the I/O enclosure.
  5. Remove both fan assemblies. See Figure 4.
    1. Unlatch the fan release lever Callout label 1 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
      Removing the I/O enclosure fan
  6. At the rear of the rack, unplug all the cables (RIO Callout label 1, SPCN Callout label 2, ID Callout label 3, FC-AL Callout label 4 and customer host Callout label 5). Ensure that the cables are labeled so they can be properly replugged. See Figure 5.
    Figure 5. PCIe, SPCN, FC-AL, customer host cables
    PCIe, SPCN, FC-AL, customer host cables
  7. Unplug the two black power cables from the 208 VDC bus bars. From the rear of the rack (as shown in Figure 6):
    1. Trace both I/O power supply cables Callout label 1 from the rear of the I/O enclosure to the 208 VDC secondary bus bars Callout label 2.
      Note: There are two power cables that exit between the rear of the I/O enclosures. You might need to gently pull on the unplugged cable from the front of the I/O enclosure to ensure that you know which cable at the rear will be unplugged in the next substeps.
    2. Gently pull the blue retention bracket Callout label 3 and then slide it to the side to allow the cable to be unplugged.
    3. Unplug the black power cable Callout label 1 from the bus bar connector Callout label 2.
    4. Remove any cable retention hardware to allow the cables to hang free.
    Figure 6. I/O with power cables
    I/O with power cables
  8. Remove the I/O enclosure chassis from the rack. See Figure 7.
    1. At the rear of the rack, remove the two hold down screws Callout label 1.
    2. Push the I/O enclosure forward towards the front of the rack Callout label 2.
    3. At the front of the rack, pull the I/O enclosure out the front being careful to balance it when it is free of the rack.
    4. Place the I/O enclosure on a static free surface.
    Figure 7. Remove the I/O enclosure chassis
    Remove the I/O enclosure chassis
  9. Remove the failing power cable.

Install the I/O enclosure power supply to 208 VDC bus bar cable

Procedure

  1. Install the new power cable alongside the I/O enclosure.
  2. Slide the I/O enclosure back into the rack and install the two hold down screws.
  3. At the rear of the rack, connect all the cables to the I/O enclosure.
  4. At the front of the rack install the two power supplies. Ensure that the red latch beneath the input power connector is secure.
  5. Reinstall the I/O power supply retention bracket.
  6. Install and latch the two fans.
  7. Connect the two black power cables to the power supplies.
  8. Route and connect the power cables to the 208 VDC bus bars.
  9. At the bus bars, slide the blue retention bracket back in position.
  10. Reinstall the cable retention hardware.
  11. Exit this service information center parts exchange procedure and return to the procedure that sent you here.