IBM System x3550 M4 Installation And Service Manual page 288

Removing a hot-swap ac power supply:
Use this information to remove a hot-swap ac power supply.
About this task
When you remove or install a hot-swap power supply, observe the following
precautions.
Statement 5
CAUTION:
The power control button on the device and the power switch on the power
supply do not turn off the electrical current supplied to the device. The device
also might have more than one power cord. To remove all electrical current from
the device, ensure that all power cords are disconnected from the power source.
Statement 8
CAUTION:
Never remove the cover on a power supply or any part that has the following
label attached.
Hazardous voltage, current, and energy levels are present inside any component
that has this label attached. There are no serviceable parts inside these
components. If you suspect a problem with one of these parts, contact a service
technician.
To remove a hot-swap ac power supply, complete the following steps:
Procedure
1. Read the safety information that begins on "Safety" on page vii and
"Installation guidelines" on page 33.
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IBM System x3550 M4 Type 7914: Installation and Service Guide