Removing an 8234-EMA, 9117-MMA, or 9406-MMA power supply with power on

Learn how to remove a power supply with the system power on if you need to replace a failing power supply or as a part of another service action.

Attention: Two power supplies must be present in the system to power on the system unit. If one power supply fails, or you have a system failure that does not stop the fans, the system will continue to operate. You can remove and replace the power supply with the system power on if it is done in less than five minutes. After five minutes, the system will power down to prevent the system from overheating. If the system power is off, go to Removing an 8234-EMA, 9117-MMA, or 9406-MMA power supply with power off.

If your system is managed by the Hardware Management Console (HMC), you can use the HMC to complete the steps for removing a power supply. For instructions, see Removing a part using the Hardware Management Console.

To remove a power supply from a system that is not managed by an HMC while the system power is on, complete the following steps:

  1. Complete the prerequisite tasks described in Before you begin.
  2. On a rack-mounted system unit, open the back rack door.
  3. Identify the power supply that needs to be replaced, as described in Identifying a failing part.
  4. Disconnect the power cable from the back of the power supply that you want to remove.
  5. Attach the wrist strap.
    Attention:
    • Attach a wrist strap to an unpainted metal surface of your hardware to prevent electrostatic discharge (ESD) from damaging your hardware.
    • When using a wrist strap, follow all electrical safety procedures. A wrist strap is for static control. It does not increase or decrease your risk of receiving electric shock when using or working on electrical equipment.
    • If you do not have a wrist strap, just prior to removing the product from ESD packaging and installing or replacing hardware, touch an unpainted metal surface of the system for a minimum of 5 seconds.
  6. As shown in Figure 1, push the release tab (A) into the open position and lift the handle (B).
    Figure 1. Power supply unlocked
    Pull the locking knob to the open position.
  7. Pull the power supply out of the system.
    Note: When you remove a power supply with the system power on, an error is logged. No action is required for this error.

If you need to replace the power supply you removed, see Replacing an 8234-EMA, 9117-MMA, or 9406-MMA power supply with power on.