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Before you begin
Replacing a power supply or fan in a 5802 or 5877 expansion unit with
power turned off
Learn how to replace a power supply or power-supply fan in a 5802 or 5877 expansion unit if you
removed a failing part and want to replace the power supply assembly with the power turned off.
If your system is managed by the Hardware Management Console (HMC), use the HMC to replace a
power supply. For instructions, see Exchanging 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
replace a power supply in the server. For instructions, see Replacing a part by using the Systems Director
Management Console.
If your system is not managed by the HMC or SDMC, complete the following steps to replace the power
supply in an expansion unit or system while the system power is turned off:
1. If you are replacing a power supply or power-supply fan because of a failure, remove the failing
part as described in “Removing a power supply or fan from a 5802 or 5877 expansion unit with
power turned off” on page 13.
2. Perform the prerequisite tasks, as described in Before you begin.
3. Open the front rack door if it is not already open.
4. 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.
5. Optional: If you want to replace a failing power-supply fan, complete the following steps:
a. Align the new fan with the opening in the power-supply assembly.
b. Press the fan (A) into its connector in the assembly, as shown in Figure 22 on page 22.
Power supplies 21