Huawei BBU3900 User Manual page 16

1 Safety Information
If the "high electrical leakage" flag is stuck to the power terminal of the device, you must ground
the device before powering it on.
Power Cable
Do not install and remove the power cable with a live line. Transient contact between the core
of the power cable and the conductor may generate electric arc or spark, which may cause fire
or eye injury.
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Fuse
To ensure that the system runs safely, when a fuse blows, replace it with a fuse of the same type
and specifications.
Electrostatic Discharge
The static electricity generated by the human body may damage the electrostatic sensitive
components on the circuit board, such as the large-scale integrated circuit (LIC).
In the following situations, the human body generates a static electromagnetic field:
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The static electromagnetic field will remain within the human body for a long time.
Before contacting the device, plug boards, circuit boards, and application specific integrated
circuits (ASICs), wear a grounded ESD wrist strap. It can prevent the sensitive components from
being damaged by the static electricity in the human body.
Figure
1-4
CAUTION
Before installing or removing the power cable, turn off the power switch.
Before connecting the power cable, ensure that the power cable and label comply with the
requirements of the actual installation.
CAUTION
CAUTION
Movement of body parts
Clothes friction
Friction between shoes and the ground
Holding plastic in hand
1-1shows how to wear an ESD wrist strap.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
BBU3900 GSM
User Guide
Issue 04 (2008-09-05)