DS8000 Service Documentation Version 7.5

Exchange the PPS 208V DDM power module

Before you begin

Icon for electrostatic discharge wrist strap Use 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.

DANGER

Hazardous voltage, current, or energy levels are present inside of a component to which this label is attached. (L001)

Remove the PPS 208V DDM power module

Procedure

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.
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.
Do not use the PPS FAULT LED indicator to identify the PPS being repaired.
- When the failing PPS is being repaired, the PPS FAULT LED indicator on the working PPS in the same rack might be on solid.
  The working PPS is indicating that the PPS being repaired is not available for use.
- Use the FRU Identify LED indicator to identify the PPS being repaired.
Figure 1. LEDs on the PPS (front)
Have the customer remove power to the PPS containing the module being replaced.
1. Instruct the customer to switch off the circuit breaker that supplies mainline ac power to the power receptacle for the PPS that contains the module being replaced.
  Attention: Use lockout and tagout procedures as defined in the Electrical Safety for IBM® Customer Engineers.
2. Observe the front of the PPS. Is the AC INPUT GOOD LED indicator off?
  - Yes, the customer has removed power from the correct PPS. Continue with the next step.
  - No, stop. The customer has not removed power from the correct PPS.
    1. Determine which PPS the customer has removed power from.
    2. Have the customer restore power to the PPS. The PPS may not power back on fully.
    3. Observe the LED indicators on the front of both PPSs with a PPS that is fully powered on. If the PPS did not power on fully, you will need to do a pseudo repair of the PPS to power it on. A pseudo repair of the PPS means that you use the normal FRU replacement procedures, but you do not replace or even disconnect the PPS cables. Refer to MAP1230 Replace a FRU without using a serviceable event.
    4. After the PPS is powered back on, return to this step and have the customer switch off the circuit breaker to the proper PPS.
To gain full access to the rear of the PPS, unfasten and then rotate the power distribution units (PDUs) away from the rear of the PPS.
Figure 2. Power distribution units in normal position (rack rear view)
Remove power and mainline power cord from the PPS.
1. On the PPS, at the ac input power module, set the CB00 switch to Off (down).
2. Push the two release levers .
3. Disconnect the mainline power cord from the ac input power module.
  Figure 3. Remove the ac mainline power cord
At the rear of the PPS that does not contain the module that is being replaced, disconnect the PPS-to-PPS communication cable at the bottom right of the PPS sequencer module (see Figure 4).
Notes:
1. Disconnecting the cable from the PPS that does not contain the module that is being replaced will protect that PPS. Then, when the other end of the cable is disconnected from the PPS containing the module that is being replaced, no pins inside that connector will be able to touch ground and shut down the PPS that does not contain the module that is being replaced.
2. This removes the remaining logic power from the PPS containing the module that is being replaced; all PPS LEDs should now be off.
Figure 4. PPS rear view, lower right: PPS-to-PPS communication cable connection
At the rear of the PPS containing the module that is being replaced, disconnect the J3 PPS-to-PPS communication cable at the bottom right of the PPS sequencer module.
Disconnect the PDU power cable from the PPS 208V DDM power module.
Remove the PPS 208V DDM power module.
1. Use the location code to determine which module location (E1 or E3). See Figure 6.
2. Remove the screws or (as applicable) from the PPS 208V DDM power module.
3. If the cable routing bracket blocks the module, remove it. Each bracket is held by two screws that only need to be loosened, not removed. See Figure 5, .
  Figure 5. Cable routing brackets
4. Remove the PPS 208V DDM power module.
  Figure 6. PPS module location codes

Install the PPS 208V power module

About this task

Note: Do not connect the PDU power cable to the PPS 208V DDM power module. It will be connected in a separate procedure after the PPS has been powered on and the module has been verified.

Procedure

Install the PPS 208V DDM power module.
1. Install the new PPS 208V DDM power module. Secure the two silver thumbscrews.
2. Ensure the enable switch on the PPS 208V power module is set to enabled (up).
3. Reinstall any cable routing brackets that were removed.
At the rear of the PPS containing the replacement module, connect the PPS-to-PPS communication cable at the bottom right of the PPS sequencer module.
At the rear of the PPS that does not contain the replacement module, connect the PPS-to-PPS communication cable at the bottom right of the PPS sequencer module.
Note: One or more of the PPS LEDs may now be lit on the PPS containing the replacement module.
Do not connect the PDU power cable to the PPS 208V DDM power module at this time. It will be connected in a separate procedure after the PPS has been powered on and the module has been verified.
Connect power.
1. At the PPS, connect the mainline power cord to the ac input power module. Secure it with both release levers .
2. At the ac input power module, set the CB00 switch to on (up) .
  Figure 7. Connect the ac mainline power cord
3. Instruct the customer to switch on the mainline circuit breaker that supplies mainline ac power to the power receptacle for the PPS containing the module being replaced. The "Do Not Operate" tag and padlock can be removed.
4. Remove the lockout tag and/or device that was applied to each customer mainline AC voltage circuit breaker, then switch on the customer circuit breaker.
Exit this service information center parts exchange procedure and return to the procedure that sent you here.