Huawei BBU3900 Hardware Maintenance Manual page 6

About This Document
This describes the maintenance items for the BBU3900 equipment. The maintenance items are
related to the fans, equipment surface, cleanliness, LEDs, and ambient temperature in the cabinet.
3 Powering On/Off the BBU3900
This describes how to power on and power off the BBU3900. During power-on, you need to
check the status of the LEDs on the BBU3900. As for the power-off, the operation in a normal
situation and that in an emergency are different.
4 Replacing the Components in the OMB
This chapter describes how to replace the components in the OMB, such as the BBU, HEUA,
AC/DC power equipment, DCDU-03B, and AC surge protection box.
5 Replacing Components of the BBU3900
This describes how to replace components of the BBU. The components are the BBU case,
boards and module of the BBU, and optical modules.
Conventions
Symbol Conventions
The symbols that may be found in this document are defined as follows.
Symbol
General Conventions
The general conventions that may be found in this document are defined as follows.
Convention
Times New Roman
Boldface
iv
Description
Indicates a hazard with a high level of risk, which if not
avoided,will result in death or serious injury.
Indicates a hazard with a medium or low level of risk, which
if not avoided, could result in minor or moderate injury.
Indicates a potentially hazardous situation, which if not
avoided,could result in equipment damage, data loss,
performance degradation, or unexpected results.
Indicates a tip that may help you solve a problem or save
time.
Provides additional information to emphasize or supplement
important points of the main text.
Description
Normal paragraphs are in Times New Roman.
Names of files, directories, folders, and users are in
boldface. For example, log in as user root.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
BBU3900
Hardware Maintenance Guide
Issue 03 (2010-06-05)