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Before you begin
Identifying a failing part
Stopping the system or logical partition
Removing the 9117-MMB or 9179-MHB power supply with the power
turned on
Learn how to remove a power supply with the system power turned on if you want 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 continues to operate.
You can remove and replace the power supply with the system power turned on if it is done in less than
5 minutes. After 5 minutes, the system turns off the power to prevent the system from overheating. If the
system power is turned off, go to “Removing the 9117-MMB or 9179-MHB power supply with the power
turned off” on page 1.
If your system is managed by the Hardware Management Console (HMC), use the HMC to remove a
power supply. For instructions, see Removing a part by using the Hardware Management Console.
If your system is managed by the IBM Systems Director Management Console (SDMC), use the SDMC to
remove a power supply in the server. For instructions, see Removing a part by using the Systems
Director Management Console.
If your system is not managed by an HMC or SDMC, complete the following steps to remove a power
supply from a system while the system power is turned on:
1. Perform the prerequisite tasks, as described in Before you begin.
2. On a rack-mounted system unit, open the rear rack door.
3. Identify the failing part, as described in Identifying a failing part.
4. Disconnect the power source from the system by unplugging the system, as described in
Disconnecting the power cords.
5. Attach the wrist strap.
Attention:
v Attach a wrist strap to an unpainted surface of your hardware to prevent electrostatic discharge
(ESD) from damaging your hardware.
v 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.
v 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 surface of the system for a minimum of 5
seconds.
6. Lift the tab (B) toward the power cord retainer (C) to release the power supply. Pull the power supply
away from the system, as shown in Figure 2 on page 4.
Power supplies 3