Lenovo THINKSERVER 3821 - Manual (Page 183)

To remove a hot-swap power supply, do the following:
1. Read the safety information Chapter 2, “Safety information,” on page 5.
Attention: Static electricity that is released to internal server components
when the server is powered on might cause the server to halt, which might
result in the loss of data. To avoid this potential problem, always use an
electrostatic-discharge wrist strap or other grounding system when you work
inside the server with the power on.
2. Disconnect the power cord from the connector on the back of the power supply
that you are removing.
3. Press the release latch on the power supply 1 and pull the power supply 2
out of the power-supply cage.
4. If you are instructed to return the hot-swap power supply, follow all packaging
instructions, and use any packaging materials for shipping that are supplied to
you.
Installing a hot-swap power supply
If you install or remove a hot-swap power supply, observe the following precautions.
Statement 8:
Chapter 7. Installing optional devices and replacing customer replaceable units 175