Lenovo System x3550 M4 Installation And Service Manual page 258

Figure 164. Fan removal
Attention: To ensure proper operation, replace a failed hot-swap fan within 30 seconds.
If you are instructed to return the fan, follow all of the packaging instructions, and use any packaging
materials for shipping that are supplied to you.
Replacing a hot-swap fan
Use this information to replace a hot-swap fan.
The server comes standard with four dual-motor hot-swap cooling fans. When there is one microprocessor
installed, install fan 1, 2, 3, and 5 for proper cooling.
Attention: To ensure proper operation, replace a failed hot-swap fan within 30 seconds.
To replace a hot-swap fan, complete the following steps:
Step 1. Read the safety information that begins on "Safety" on page v and "Installation guidelines"
on page 31.
Step 2. Remove the cover (see "Removing the cover" on page 189).
Step 3. Touch the static-protective package that contains the new fan to any unpainted metal surface on
the server. Then, remove the new fan from the package.
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System x3550 M4 Installation and Service Guide