Working Inside The Server With The Power On - Lenovo x3550 M4 Installation And Service Manual

v Each of the drive bays has a drive or a filler panel and electromagnetic
compatibility (EMC) shield installed in it.
v Each of the power-supply bays has a power supply or a filler installed in it.
v If the server has redundant power, each of the power-supply bays has a power
supply installed in it.
v There is adequate space around the server to allow the server cooling system to
work properly. Leave approximately 50 mm (2.0 in.) of open space around the
front and rear of the server. Do not place objects in front of the fans. For proper
cooling and airflow, replace the server cover before you turn on the server.
Operating the server for extended periods of time (more than 30 minutes) with
the server cover removed might damage server components.
v You have followed the cabling instructions that come with optional adapters.
v You have replaced a failed fan within 48 hours.
v You have replaced a hot-swap fan within 30 seconds of removal.
v You have replaced a hot-swap drive within 2 minutes of removal.
v You have replaced a failed hot-swap power supply within 2 minutes of removal.
v You do not operate the server without the air baffle installed. Operating the
server without the air baffle might cause the microprocessor to overheat.
v Microprocessor socket 2 always contains either a socket cover or a
microprocessor and heat sink.
v You have installed the fourth and sixth fans when you installed the second
microprocessor option.

Working inside the server with the power on

Use this information when working inside the server with the power on.
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.
You might have to have the server turned on while the cover is off, to look at light
path diagnostics LEDs or replace hot swap components. Follow these guidelines
when you work inside a server that is turned on:
v Avoid wearing loose-fitting clothing on your forearms. Button long-sleeved
shirts before working inside the server; do not wear cuff links while you are
working inside the server.
v Do not allow your necktie or scarf to hang inside the server.
v Remove jewelry, such as bracelets, necklaces, rings, and loose-fitting wrist
watches.
v Remove items from your shirt pocket, such as pens and pencils, that could fall
into the server as you lean over it.
v Avoid dropping any metallic objects, such as paper clips, hairpins, and screws,
into the server.
Chapter 2. Installing optional devices
35