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4. Connect the power cord for the new ac power supply to the power-cord
connector on the power supply.
The following illustration shows the ac power-supply connectors 1 on the rear
of the server.
5. Route the power cord through the power-supply handle and through any cable
clamps on the rear of the server, to prevent the power cord from being
accidentally pulled out when you slide the server in and out of the rack.
6. Connect the power cord to a properly grounded electrical outlet.
7. Make sure that the error LED on the power supply is not lit, and that the dc
power LED and ac power LED on the power supply are lit, indicating that the
power supply is operating correctly.
If you have other optional devices to install or remove, do so now. Otherwise, go to
“Completing the installation” on page 227.
Removing a hot-swap fan
The server comes with three replaceable fans.
Attention: To ensure proper server operation, if a fan fails, replace it immediately.
Have a replacement fan ready to install as soon as you remove the failed fan.
To remove a replaceable fan, complete the following steps.
1. Read the safety information that begins on page 3.
2. Leave the server connected to power.
3. Slide the server out of the rack and remove the cover (see “Removing the
cover” on page 159). The LED near the failing fan will be lit.
Attention: To ensure proper system cooling, do not remove the top cover for
more than two minutes during this procedure.
196 ThinkServer RD220 Types 3729, 3779, 3797, and 3798: Hardware Maintenance Manual