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Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. For any

assistance, please contact our local office or company headquarters.

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Copyright Huawei Technologies Co., Ltd. 2009. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior written

consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei trademarks are the property of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice

The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but the statements, information, and

recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Proprietary and Confidential

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Contents

About This Document.....................................................................................................................1

1 Changes in BTS3900 GSM Site Maintenance Guide..........................................................1-1

2 Preparations for Base Station Site Maintenance..................................................................2-1

3 Hardware Items of BTS3900 Routine Maintenance............................................................3-1

3.1 Maintenance Items of the Equipment Room Environment of the Base Station..............................................3-2

3.2 Power Supply and Grounding System Maintenance Items of the Base Station..............................................3-3

3.3 Maintenance of the Main Components in the Base Station............................................................................3-4

4 Powering On and Powering Off a BTS3900 Cabinet..........................................................4-1

4.1 Powering On the BTS3900.............................................................................................................................4-2

4.2 Powering Off the BTS3900.............................................................................................................................4-4

5 Replacing the BTS3900 Components.....................................................................................5-1

5.1 Replacing BBU3900 Parts..............................................................................................................................5-2

5.1.1 Replacing the BBU3900.........................................................................................................................5-2

5.1.2 Replacing the BBU Parts........................................................................................................................5-3

5.2 Replacing a DCDU-01 Module.....................................................................................................................5-12

5.3 Replacing the FAN Unit................................................................................................................................5-14

5.4 Replacing the PMU.......................................................................................................................................5-17

5.5 Replacing a PSU............................................................................................................................................5-19

5.6 Replacing the GATM....................................................................................................................................5-21

5.7 Replacing an RFU.........................................................................................................................................5-22

5.8 Replacing the BTS3900 Power Subrack.......................................................................................................5-25

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Figures

Figure 5-1 Removing the protection cover.........................................................................................................5-13

Figure 5-2 Removing the screws on the two mounting ears of the module.......................................................5-13

Figure 5-3 Position of the FAN unit switch.......................................................................................................5-15

Figure 5-4 Raising the adjustable cable trough .................................................................................................5-16

Figure 5-5 Removing the FAN unit...................................................................................................................5-17

Figure 5-6 Removing the PMU..........................................................................................................................5-18

Figure 5-7 Set the DIP switch............................................................................................................................5-19

Figure 5-8 Installing the PMU............................................................................................................................5-19

Figure 5-9 Removing the PSU...........................................................................................................................5-20

Figure 5-10 Installing the PSU...........................................................................................................................5-20

Figure 5-11 Loosening the screws......................................................................................................................5-21

Figure 5-12 Removing an RFU..........................................................................................................................5-24

Figure 5-13 Removing the PMU/PSU................................................................................................................5-26

Figure 5-14 Removing the screws from the mounting ears...............................................................................5-27

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Tables

Table 3-1 Maintenance items of the equipment room environment of the base station.......................................3-2

Table 3-2 Maintenance items of the power supply and grounding system of the base station............................3-3

Table 3-3 Maintenance items of the main components in the Base Station.........................................................3-4

Table 4-1 Power switches on the DCDU..............................................................................................................4-2

Table 4-2 LED status of different parts when power supply is normal................................................................4-3

Table 4-3 Troubleshooting...................................................................................................................................4-3

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About This Document

Purpose

After BTS system deployment, commercial operations are started on site. To ensure smooth

operation, you need to perform routine maintenance on the BTS.

This document describes the routine hardware maintenance items of the BTS3900. The itemsare equipment room environment maintenance, power and grounding system maintenance, and

cabinet maintenance. This document also describes the procedures for replacing parts, modules,

and boards.

Product Version

The following table lists the product version related to the document.

Product Name Product Version

BTS3900 GSM (hereinafter referred to asBTS3900)

V300R008&R009

Intended Audience

This document is intended for:

l Technical support engineers

l Maintenance engineers

Organization

1 Changes in BTS3900 GSM Site Maintenance Guide

This provides the changes in the BTS3900 GSM Site Maintenance Guide.

2 Preparations for Base Station Site Maintenance

This describes the preparations for base station site maintenance. The preparations for site

maintenance involve obtaining site information, selecting maintenance items, and arranging

maintenance tools and spare parts.

3 Hardware Items of BTS3900 Routine Maintenance

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This describes the routine maintenance for the hardware items in the BTS3900. The hardware

items that are routinely maintained refer to the equipment room environment of the base station,

power supply and grounding system of the base station, and main components in the BTS3900.

4 Powering On and Powering Off a BTS3900 Cabinet

This describes how to power on and power off a BTS3900 cabinet. The procedures for powering

off the BTS3900 cabinet in normal and emergency cases are different.

5 Replacing the BTS3900 Components

Replacing the BTS3900 components involves replacing the BBU components, DCDU-01, FAN

unit, PMU, PSU, GATM, RFU, and power supply subrack.

Conventions

Symbol Conventions

The symbols that may be found in this document are defined as follows.

Symbol 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.

General Conventions

The general conventions that may be found in this document are defined as follows.

Convention Description

Times New Roman Normal paragraphs are in Times New Roman.

Boldface Names of files, directories, folders, and users are in

boldface. For example, log in as userroot.

Italic Book titles are in italics.

Courier New Examples of information displayed on the screen are in

Courier New.

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Command Conventions

The command conventions that may be found in this document are defined as follows.


Boldface The keywords of a command line are in boldface.

Italic Command arguments are in italics.

[ ] Items (keywords or arguments) in brackets [ ] are optional.

{ x | y | ... } Optional items are grouped in braces and separated by

vertical bars. One item is selected.

[ x | y | ... ] Optional items are grouped in brackets and separated by

vertical bars. One item is selected or no item is selected.

{ x | y | ... }* Optional items are grouped in braces and separated by

vertical bars. A minimum of one item or a maximum of all

items can be selected.

[ x | y | ... ]* Optional items are grouped in brackets and separated by

vertical bars. Several items or no item can be selected.

GUI Conventions

The GUI conventions that may be found in this document are defined as follows.


Boldface Buttons, menus, parameters, tabs, window, and dialog titles

are in boldface. For example, clickOK.

> Multi-level menus are in boldface and separated by the ">"

signs. For example, choose File > Create > Folder .

Keyboard Operations

The keyboard operations that may be found in this document are defined as follows.

Format Description

Key Press the key. For example, press Enter and press Tab.

Key 1+Key 2 Press the keys concurrently. For example, pressing Ctrl+Alt

+A means the three keys should be pressed concurrently.

Key 1, Key 2 Press the keys in turn. For example, pressing Alt, A means

the two keys should be pressed in turn.

Mouse Operations

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The mouse operations that may be found in this document are defined as follows.

Action Description

Click Select and release the primary mouse button without moving

the pointer.

Double-click Press the primary mouse button twice continuously and

quickly without moving the pointer.

Drag Press and hold the primary mouse button and move the

pointer to a certain position.

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1Changes in BTS3900 GSM Site MaintenanceGuide

This provides the changes in the BTS3900 GSM Site Maintenance Guide.

02(2009-09-30)

This is the first commercial release.

Compared with issue 01(2009-07-15) of V300R009, the changed parts in this release are as

follows:

l The description of replacing the GTMU is changed, refer to Replacing the GTMU.

l The description of replacing the USCU is changed, refer to Replacing the USCU.

01(2009-07-15)

This is the draft release.

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2 Preparations for Base Station SiteMaintenance

This describes the preparations for base station site maintenance. The preparations for site

maintenance involve obtaining site information, selecting maintenance items, and arranging

maintenance tools and spare parts.

Obtaining Site Information

Before you maintain the base station site, obtain the following information:

l Unsolved faults and alarms

l Hardware configurations

l Local environment

l Spare parts

Selecting Maintenance Items

Select suitable maintenance items based on actual requirements of the base station. The

maintenance items are as follows:

l Maintaining the equipment room environment of the base station

l Maintaining power supply and grounding system of the base station

l Maintaining the main components in the base station

l Maintaining the antenna system of the base station

Arranging Tools and Spare Parts

Arrange the related maintenance tools and spare parts based on the site information and

maintenance items of the base station.

The most commonly used tools for site maintenance are as follows:

l Frequency test devices comprise of spectrum analyzer, and various connectors and cables.

l

Power test devices are used to test and analyze the output power of the base station. Powermeter is a commonly used power test device.

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l The antenna and feeder test devices are used to test the standing wave ratio, return loss,

and cable insertion loss, and to locate faults. The commonly used antenna and feeder test

device is the SiteMaster.

l Other devices

Multimeter

Diagnosis tools for maintenance and test devices for robustness of the base station

Local Maintenance Terminal (LMT)

Rubidium clock (used to locate the clock of the base station)

Spare parts

NOTE

When some parts are faulty and thus need to be replaced, arrange related tools and new parts for

replacement.

2 Preparations for Base Station Site Maintenance

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3Hardware Items of BTS3900 RoutineMaintenance

About This Chapter

This describes the routine maintenance for the hardware items in the BTS3900. The hardware

items that are routinely maintained refer to the equipment room environment of the base station,

power supply and grounding system of the base station, and main components in the BTS3900.

3.1 Maintenance Items of the Equipment Room Environment of the Base Station

This provides the maintenance items, maintenance intervals, operation instructions, and

reference standards of the base station equipment room environment.

3.2 Power Supply and Grounding System Maintenance Items of the Base Station


reference standards of the base station power supply and grounding system.

3.3 Maintenance of the Main Components in the Base Station

This describes the maintenance items, maintenance interval, operating instruction, and reference

standard of the main components in the Base Station.

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3.1 Maintenance Items of the Equipment RoomEnvironment of the Base Station


reference standards of the base station equipment room environment.

Table 3-1 describes how to maintain the base station equipment room environment.

Table 3-1 Maintenance items of the equipment room environment of the base station

Item Interval Operating Instruction Reference Standard

Checking

environmental

alarms

Daily Check whether power

supply alarms, fire alarms,

or smoke alarms arereported.

No power supply alarms,

fire alarms, or smoke

alarms are reported.

Checking the

temperature in

the equipment

room

Weekly Record the temperature read

on the thermometer in the

equipment room.

-20 to +50

Checking the

humidity in the

equipment

room

Weekly Record the humidity read on

the hygrometer in the

equipment room.

5% to 85%

Checking theillumination in

the equipment

room

Every twomonths

Check whether the routineand emergency illumination

in the equipment room is

normal.

-

Checking the air

conditioner

Every two

months

Check whether the air

conditioner is working

normally.

-

Checking

protective

devices

Every two

months

Check whether anti-disaster

devices, equipment

protection devices, and fire-

protection devices are in

good condition.

l The foam extinguisher or

dry powder fire

extinguisher is installed

in the equipment room.

The pressure and validity

period of the

extinguisher meet the

requirements.

l There is no danger of

damage to the equipment

by rats or insects.


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Cleaning the

equipment

room

Every two

months

Check whether cabinets,

equipment housing,

equipment interior, tables,

floor, doors, and windows

are clean.

All the items to be checked

are clean.

3.2 Power Supply and Grounding System MaintenanceItems of the Base Station


reference standards of the base station power supply and grounding system.

Table 3-2 lists the routine maintenance items for the power supply and the grounding system

of the .

Table 3-2 Maintenance items of the power supply and grounding system of the base station

Item Interval Operating Instruction

Reference Standard

Checking power

cables

Monthly Check the connections

of power cables

carefully.

The power cables are not

aging, and there is no

corrosion on the

connection points.

Checking the

voltage

Monthly Measure the voltage of

the power supply by

using a multimeter.

The voltage is within

standard range.

Checking PGND

cables

Monthly Check whether the

PGND cable and

grounding bar are

connected properly.

The connections of the

PGND cable are sound. It

is not aging. The

connection points are

sound with no corrosion

on them.

Earth resistance Monthly Measure the earth

resistance by using an

electric earth resistance

tester and keep a record.

The grounding resistance

of the cabinet is smaller

than 10 ohms.

Checking the

storage batteries

Yearly Check the storage

batteries and rectifiers

every year.

The battery capacity is

within the normal range

and the batteries are

correctly connected. The

performance parameters

of rectifiers are normal.

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3.3 Maintenance of the Main Components in the BaseStation

This describes the maintenance items, maintenance interval, operating instruction, and reference

standard of the main components in the Base Station.

Table 3-3 describes the maintenance items of the main components in the Base Station.

Table 3-3 Maintenance items of the main components in the Base Station


Checking the

fans

Monthly Check whether the fans are

operational.

The fans work properly

without exceptional

sounds generated byfrictions between the

blades of the fan and the

subrack.

Checking the

air filter

Quarterly If there is too much dust on the

air filter, clean the air filter.

-

Checking the

exterior of the

cabinet

Quarterly Check whether there are dents,

cracks, holes, or corrosion on

the surface of the cabinet and

whether the cabinet label is

legible.

-

Checking the

lock and door

of the cabinet

Quarterly Check whether the lock is

normal and the door can be

opened and closed easily.

-

Checking the

cleanness of

the cabinet

Quarterly Check whether the cabinet is

clean.

The cabinet surface is

clean. The subracks are

not dusty.

Checking the

fan box

Annually If there is too much dust on the

surface of or inside the fan box,

clean the fan box.

-

CheckingLEDs on the

boards

Monthly Check whether the LEDs on theboards are normal.

For details about thestatus of LEDs, see the

hardware description

about the corresponding

boards.


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Checking the

ESD wrist

strap

Quarterly Use either of the following

methods:

l Use an ESD wrist strap testerto test the ESD wrist strap.

l Use a multimeter to test the

earth resistance of the ESD

wrist strap.

l If you are using an

ESD wrist strap tester,

the LED GOOD is on.

l If you are using a

multimeter, the earth

resistance is between

0.75 megohm and 10

megohms.

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4 Powering On and Powering Off a BTS3900Cabinet

About This Chapter

This describes how to power on and power off a BTS3900 cabinet. The procedures for powering

off the BTS3900 cabinet in normal and emergency cases are different.

4.1 Powering On the BTS3900

This describes how to power on the BTS3900 cabinet and handle the power supply failure to

the internal parts of the cabinet.

4.2 Powering Off the BTS3900

This describes how to power off the BTS3900 cabinet. The BTS3900 power-off is classified

into normal power-off and emergency power-off.

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4.1 Powering On the BTS3900

This describes how to power on the BTS3900 cabinet and handle the power supply failure to

the internal parts of the cabinet.

Prerequisite

l The input power cables are correctly and securely connected.

l The power input of the BTS3900 cabinet meets the specifications.

l The power switches on the DCDU are all set to OFF.

l The external power supply to the BTS3900 cabinet is disconnected.

Context

Table 4-1 lists the power switches on the DCDU.

Table 4-1 Power switches on the DCDU

Module Power Switch on the DCDU

- SPARE2

GATM SPARE1

BBU BBU

FAN FAN

RFU5 RFU5

RFU4 RFU4

RFU3 RFU3

RFU2 RFU2

RFU1 RFU1

RFU0 RFU0

CAUTION

The cabinet must be powered on in seven days after unpacked. In addition, the cabinet cannot

be in the power-off state for more than 48 hours during maintenance.

Procedure

Step 1 Switch on the external power equipment to power on the cabinet.


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If... Then...

The cabinets are BTS3900 (+24 V) cabinet and BTS3900 (220 V) cabinet, Go to Step 2.

The cabinet is BTS3900 (-48 V) cabinet, Go to Step 3.

Step 2 Check whether the PSU is running properly by referring to PSU (AC/DC) and PSU (DC/DC).

Step 3 Check whether the input voltage of the DCDU in the BTS3900 is normal.

If... Then...

The input voltage of the DCDU is not in the

range -38.4 V DC to -57 V DC,

The DC power supply inside the cabinet is

abnormal, go to Step 4.

The input voltage of the DCDU is in the

range -38.4 V DC to -57 V DC,

The cabinet power-on check is complete. Go to

Step 7.

Step 4 Switch off the external power supply of the BTS3900 cabinet to disconnect the power supply tothe cabinet.

Step 5 Check the connection and routing of the power cables for the DCDU.

Step 6 Go to Step 3 to check whether the input voltage of the DCDU is normal.

Step 7 Switch on the power switches on the DCDU, and then check the DC power supply to the internalparts of the cabinet based on Table 4-2.

Table 4-2 LED status of different parts when power supply is normal

Part Normal LED Status

GATM The RUN LED on the board panel blinks.

BBU All the LEDs on the BBU panel are on.

FAN unit The fans run normally and the RUN LED on

the panel blinks.

RFU All the six LEDs on each RFU are on.

Step 8 When there is a power supply failure to the internal parts of the cabinet after powering on the

cabinet, check the following items listed in Table 4-3.

Table 4-3 Troubleshooting

Fault Type Handling Measures

Power supply failure to all the internal parts

of the cabinet

Check whether the GND cable and the -48 V

power cable are inversely connected.

l If the cable connection is wrong, set all the

power switches on the DCDU to OFF, and

then reconnect the power cables.

l If the cable connection is correct, replace

the DCDU.

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Power supply failure to a board in the cabinet Check the following items:

1. Remove the board, and then check whether

the pins of the board slot on the backplane

are distorted, broken, or missing. Replace

the subrack if necessary.

2. Install the board into the subrack and check

the LED on the board.

3. If the LED blinks improperly, remove the

board and insert it into another idle slot that

can house the board of the same type.

Then, check the LED on the board.

l If the board works properly, you can

infer that the slot is faulty. Replace the

subrack.

l

If the board still works improperly,replace the board.

Power supply failure to any other part in the

cabinet

Use a multimeter to measure the input voltage

of the faulty part.

l If the input voltage is in the range -38.4 V

and -57 V, replace the part.

l If the input voltage is not in the range -38.4

V and -57 V, check the connections of

power cables for the part. If the power

cables are in poor connection, set all the

power switches on the DCDU to OFF, and

then reconnect the power cables. If thepower cables are in good connection,

replace the DCDU because the power

switches on it may be faulty.

----End

4.2 Powering Off the BTS3900

This describes how to power off the BTS3900 cabinet. The BTS3900 power-off is classifiedinto normal power-off and emergency power-off.

Procedure

Step 1 Choose normal power-off or emergency power-off based on the specific requirement.

If... Then...

The BTS is powered off in the case of an

equipment swap or a foreseeable regional

blackout,

Go to Step 2 to perform the normal power-

off.


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If... Then...

The BBU incurs electric spark, smog, or

water immersion,

Go to Step 3 to perform the emergency

power-off.

Step 2 To perform normal power-off, do as follows:

1. Modify the management status to block all the RFUs in the cabinet.

2. Set all the power switches on the DCDU to OFF.

3. Switch off the external power supply to the BTS3900.

Step 3 Switch off the external power supply to the BTS3900. Then, if time allows, turn off the powerswitch on the DCDU.

----End

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5 Replacing the BTS3900 ComponentsAbout This Chapter

Replacing the BTS3900 components involves replacing the BBU components, DCDU-01, FAN

unit, PMU, PSU, GATM, RFU, and power supply subrack.

5.1 Replacing BBU3900 Parts

This describes how to replace the BBU3900 parts. The BBU3900 parts consist of the BBU3900,

and the internal boards of the BBU3900.

5.2 Replacing a DCDU-01 Module

The DCDU-01, installed under the BBU, supplies DC power for the cabinet and performs surge

protection. Replacing the DCDU-01 disrupts the services carried on the corresponding cabinet.

It takes about 20 minutes to replace the DCDU-01.

5.3 Replacing the FAN Unit

The FAN unit works with the air inlet box in the cabinet to form a ventilation path. The FAN

unit provides forced ventilation and dissipation for the BBU and RFU. Replacing the FAN unit

may result in over-temperature alarms due to interruption of heat dissipation for the cabinet but

has no negative effect on services of the BTS. It takes about 20 minutes to replace a FAN unit.

5.4 Replacing the PMU

When the PMU is faulty and cannot be repaired in time, you must replace it.

5.5 Replacing a PSU

When a PSU is faulty and cannot be repaired in time, you must replace it.

5.6 Replacing the GATM

This describes how to replace the GSM antenna and TMA control module (GATM). The GATM

controls the RET antenna and supplies power to the TMA. The replacement of the GATM

disrupts the services carried on it.

5.7 Replacing an RFU

The RFU is an RF filter unit, which is located in the RFC. Replacing an RFU disrupts all the

services carried on the RFU.

5.8 Replacing the BTS3900 Power Subrack

The power subrack is located in the lower part of the BTS3900 cabinet. It houses PSUs and PMUand provides power input and output ports. It takes about 25 minutes to replace a power subrack.

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5.1 Replacing BBU3900 Parts

This describes how to replace the BBU3900 parts. The BBU3900 parts consist of the BBU3900,

and the internal boards of the BBU3900.

5.1.1 Replacing the BBU3900

This describes how to replace the BBU3900. The BBU3900 is the BTS control unit and enables

the interaction between the BTS and the BSC. The replacement of the BBU3900 disrupts all the

services carried on the BTS.

5.1.2 Replacing the BBU Parts

This describes how to replace the faulty UBFA, UPEU, UEIU, GTMU, UELP, UFLP, USCU,

and optical module.

5.1.1 Replacing the BBU3900This describes how to replace the BBU3900. The BBU3900 is the BTS control unit and enables

the interaction between the BTS and the BSC. The replacement of the BBU3900 disrupts all the

services carried on the BTS.

Prerequisite

1. The configuration (involving hardware and software) of the faulty BBU3900 is determined

and a new BBU3900 of the same configuration is available.

2. The tools and materials are ready. The required tools and materials are ESD gloves, an ESD

wrist strap, a Phillips screwdriver, a flat-head screwdriver, an ESD box or bag, dustfree

cloth, and a fiber cleaner.

Context

Replacing the BBU3900 involves disconnecting and connecting cables. It takes about 30 minutes

to replace the BBU3900.

WARNING

The replacement of the BBU3900 disrupts all the services carried on the BTS. Therefore, perform

this task with caution.

WARNING

You must take proper ESD prevention measures, for example, wear an ESD wrist strap or a pair

of ESD gloves to prevent the boards, modules, or electrical components from being damaged

by static electricity generated by your body.

Procedure

Step 1 Power off the BTS in a common situation.


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Step 2 Label the cables on the BBU3900 and remove the cables. Then, take proper insulation measuresto remove the BBU3900 and put it in an ESD box.

Step 3 Unpack the new BBU3900, check the BBU3900, and ensure that the BBU3900 is intact, the DIP

switches are properly set, and the hardware version is consistent with the BBU3900 to bereplaced. Then, install the new BBU3900. Install the cables on the panel of the new board

according to the recorded installation positions.

Step 4 Switch on the external power supply to the BTS and power on the BTS.

Step 5 Perform software loading and data configuration for GTMU on the LMT.

----End

Postrequisite

After replacing the BBU3900, verify the following items:

l The related alarms on the LMT or M2000 are cleared.

l An MS can access the cell in service area of the BBU3900.

Contact the local Huawei office to handle the faulty BBU3900.

5.1.2 Replacing the BBU Parts

This describes how to replace the faulty UBFA, UPEU, UEIU, GTMU, UELP, UFLP, USCU,

and optical module.

Replacing a UBFA

The UBFA is the fan module in the BBU. The UBFA and the air inlet box in the BBU form a

ventilation loop, implementing forced heat dissipation for the BBU. During the replacement of

the UBFA, the heat generated by the BBU cannot be properly ventilated and, with temperature

increase, an overtemperature alarm is reported. The services, however, are not affected.

Prerequisite

l The quantity of faulty UBFAs is checked, and new modules are ready.

l The installation position of the faulty UBRA and status of the LEDs on the UBFA are

recorded.

l The required tools and materials such as ESD wrist strap/ESD gloves and ESD box/ESD

bag are kept ready.

Context

This board is hot swappable.

It takes about three minutes to replace a UBFA, which involves removing the faulty UBFA,

installing the new UBFA, and waiting for the new UBFA to start working properly.

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CAUTION

l Take proper ESD protection measures, for example, wear an ESD wrist strap or a pair of

ESD gloves, to prevent electrostatic damage to the boards, modules, or electroniccomponents.

l Replacing the UBFA causes the temperature of the BBU to increase, which results in the

overtemperature alarm.

Procedure

Step 1 Loosen the screws on the panel of the UBFA.

Step 2 Remove the faulty UBFA from the slot.

CAUTION

If one or more fans are still rotating in the faulty FAN unit, do not touch the rotating fans by

hand to avoid being hurt after the FAN unit is removed.

Step 3 Slide the new UBFA into the slot.

Step 4 Tighten the screws on the panel of the new UBFA.

Step 5 Check the running status of the new UBFA.

NOTE

For details on the LED of the UBFA, see the UBFA.

----End

Postrequisite

Record the bar code of the replaced board.

Contact the local Huawei office to handle the faulty UBFA.

Replacing a UPEUThe UPEU is the power module of the BBU and provides power for the boards in the BBU. The

UPEU supports the -48/+24V V DC input. During the replacement of the UPEU, the BBU is

powered off and the ongoing-services are disrupted.

Prerequisite

l The number and types of faulty UPEUs are obtained, and new UPEUs are available.

l The status of the LEDs on the faulty UPEU and cable connections on the panel are recorded.

l The state of the switch on the power board is confirmed.

l

The required tools and materials such as an ESD wrist strap/ESD gloves and an ESD box/ESD bag are kept ready.


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Context

It takes about 10 minutes to replace the board. The duration of the replacement involves the

removal of the cables and the faulty UPEU, the installation of the new UPEU and the cables,

and the time elapsed for the operation of the UPEU.

CAUTION

Take proper ESD protection measures, for example, wear an ESD wrist strap or a pair of ESD

gloves, to prevent electrostatic damage to the boards, modules, or electronic components.

Procedure

Step 1 Power off the BBU by referring to Powering Off the BBU3900.

Step 2 Remove the cables from the panel of the faulty UPEU.

Step 3 Loosen the screws on the panel of the UPEU.

Step 4 Remove the faulty UPEU from the slot.

Step 5 Put the faulty UPEU into the ESD bag.

Step 6 Slide the new UPEU into the slot of the faulty UPEU.

Step 7 Fasten the screws on the panel of the new UPEU.

Step 8 Install the cables on the panel of the new board according to the recorded installation positions.

Step 9 Power on the BBU by referring to Powering on the BBU3900.

Step 10 Check the running status of the new UPEU.

NOTE

For details on the LED of the UPEU, see the UPEU.

----End

Postrequisite

Record the BOM code of the replaced board.

Contact the local Huawei office to handle the faulty UPEU.

Replacing the UEIU

The Universal Environment Interface Unit (UEIU) is used to transmit the monitoring signals of

the service boards in the BBU. During the replacement of the UEIU, the external devices cannot

be monitored.

Prerequisite

l The number and types of faulty UEIUs are determined, and new UEIUs are available.

l

The installation positions of the faulty UEIUs and the interconnection relations of the cableson the UEIU panels are recorded.

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bag are kept ready.

Context


It takes about 5 minutes to replace the board. The duration of the replacement involves the

removal of the cables and the faulty UEIU, the installation of the new UEIU and the cables, and

the time elapsed for the operation of the UEIU.

CAUTION



Procedure

Step 1 Remove the cables from the panel of the faulty UEIU.

Step 2 Loosen the screws on the panel of the UEIU.

Step 3 Remove the faulty UEIU from the slot.

Step 4 Put the faulty UEIU into an ESD bag.

Step 5 Slide the new UEIU into the slot of the faulty UEIU.

Step 6 Fasten the screws on the panel of the new board.

Step 7 Install the cables on the panel of the new board according to the recorded installation positions.

----End

Postrequisite


Contact the local Huawei office to handle the faulty UEIU.

Replacing the GTMUAs the basic transmission and control entity of the BBU, the GTMU controls and manages the

entire base station. It provides the interfaces associated with reference clock, power supply, OM,

and external alarm collection. Replacing the GTMU may disrupt all services on the base station.

Prerequisite

l The quantity and types of faulty GTMUs are confirmed, and new GTMUs are ready.

l The LED status and cable connections on the faulty GTMU and the cable position on the

panel of the GTMU are recorded.

l The logs and history alarms before the alarm is generated are extracted.

l The operation logs of the board are extracted.


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l The tools and materials, such as an ESD wrist strap or a pair of ESD gloves and an ESD

box or bag, are ready.

Context

The board is hot-swappable.

It takes about 15 minutes to replace a board. The replacement process involves disconnecting

cables, removing the faulty board, installing the new board, connecting cables to the new board,

and waiting the new board to resume services.

CAUTION



NOTE

The GTMU hereinafter mentioned in this document is the first type.

Procedure

Step 1 Block the faulty GTMU on the OM system.

Step 2 Remove the faulty GTMU.

1. Attach temporary labels to the cables, and then disconnect the cables from the faulty

GTMU.

2. Loosen the screws on the panel of the faulty GTMU.

3. Turn the ejector lever outwards, and then remove the faulty GTMU from the slot.

4. Put the faulty GTMU into the ESD bag.

Step 3 Install a new GTMU.

1. Place and slide the new GTMU into the original slot where the faulty GTMU is installed.

2. Turn the ejector lever inwards, and then tighten the screws on the panel of the new GTMU.

3. Connect the cables to the panel of the new GTMU according to the temporary labels.

Step 4 Check the status of the LEDs to ensure that the new board runs properly.

NOTE

For details on the LEDs, see GTMU.

Step 5 Determine whether related alarms are reported.

1. Query the active alarms of the board on the OM system.

2. If active alarms are reported, clear them according to the handling suggestion. If no alarm

is reported, go to Step 6.

Step 6 Activate the BootROM or software version of the new board.

Step 7 Check and ensure that the version of the new board is consistent with the latest version on theexisting network. If not, upgrade the version of the new board.

Step 8 Unblock the new board on the OM system.

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Step 9 Check whether the board can carry services. Perform a dial test after the board is replaced.

----End

Postrequisitel Record the BOM code of the replaced board.

l Contact the local Huawei office to handle the faulty GTMU.

Replacing the UELP

The UELP is used for E1/T1 surge protection of the BBU. Each UELP provides surge protection

for four E1/T1 signals. The UELP replacement interrupts the E1/T1 links. Thus, the ongoing

BTS services are disrupted.

Prerequisite

l The number and types of faulty UELPs are determined, and new UELPs are kept ready.

l The installation positions of the UELP and the interconnection relations of the cables on

the UELP panel are recorded.


bag are kept ready.

Context


It takes about two minutes to replace the board. The duration of the replacement involves the

removal of the cables and the faulty board, the installation of the new board and the cables, andthe time required for the operation of the board.

CAUTION

Take correct ESD prevention measures, such as wearing an ESD wrist strap or ESD gloves, to

avoid static damage to boards, modules, and electronic components.

Procedure

Step 1 Remove the cables from the panel of the faulty UELP.

Step 2 Loosen the screws on the panel of the UELP.

Step 3 Remove the faulty UELP from the slot.

Step 4 Slide the new UELP into the slot of the faulty UELP.

Step 5 Fasten the screws on the panel of the new UELP.

Step 6 Install the cables on the panel of the new UELP according to the recorded installation positions.

Step 7 Perform the dialing test to verify that the services are resumed.

----End


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Postrequisite


Contact the local Huawei office to handle the faulty UELP.

Replacing the UFLP

The UFLP is used for FE surge protection of the BBU. The UFLP replacement interrupts the

E1/T1 links. Thus, the ongoing BTS services are disrupted.

Prerequisite

l The number and types of faulty UFLPs are determined, and new UFLPs are kept ready.

l The installation positions of the UFLP and the interconnection relations of the cables on

the UFLP panel are recorded.

l

The required tools and materials such as ESD wrist strap/ESD gloves and ESD box/ESDbag are kept ready.

Context


It takes about two minutes to replace the board. The duration of the replacement involves the

removal of the cables and the faulty board, the installation of the new board and the cables, and

the time required for the operation of the board.

CAUTION

Take correct ESD prevention measures, such as wearing an ESD wrist strap or ESD gloves, to

avoid static damage to boards, modules, and electronic components.

Procedure

Step 1 Remove the cables from the panel of the faulty UFLP.

Step 2 Loosen the screws on the panel of the UFLP.

Step 3 Remove the faulty UFLP from the slot.

Step 4 Slide the new UFLP into the slot of the faulty UFLP.

Step 5 Fasten the screws on the panel of the new UFLP.

Step 6 Install the cables on the panel of the new UFLP according to the recorded installation positions.

Step 7 Perform the dialing test to verify that the services are resumed.

----End

Postrequisite


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Contact the local Huawei office to handle the faulty UFLP.

Replacing the USCU

The USCU is the extended satellite card clock unit of the BBU3900. It receives clock signalssuch as the GPS, RGPS, BITS, and M-1PPS signals. In addition, it transmits or receives 1PPS

+TOD clock signals. Replacing the USCU does not affect the services.

Prerequisite

l The quantity and type of faulty USCUs are confirmed, and new USCUs is ready.

l The cable connections on the faulty USCU and their positions on the panel of the USCU

are recorded.

l The status of the LEDs on the panel of the board is recorded, and the operation log of the

main control board is exported.

l The tools and materials, such as an ESD wrist strap or a pair of ESD gloves and an ESDbox or bag, are ready.

Context

The board is hot-swappable.

CAUTION



Procedure

Step 1 Block the faulty USCU on the OM system.

Step 2 Check the position of the board.

Before replacing a board, confirm the board to be replaced and attach a label to its panel to avoid

malfunctions.

Step 3 Remove the faulty USCU.

1. Attach temporary labels to the cables, and then disconnect the cables from the faulty USCU.

2. Loosen the screws on the panel of the faulty board.

3. Turn the ejector lever outwards, and then remove the faulty board from the slot.

4. Put the faulty board into the ESD box or bag.

Step 4 Install a new USCU.

1. Take out the new USCU, and check that it is intact and that the version of the new USCU

is consistent with that of the faulty USCU.

2. Place and slide the new USCU into the original slot where the faulty USCU is installed.

3. Turn the ejector lever inwards, and then tighten the screws on the panel of the new USCU.

4. Connect the cables to the panel of the new USCU according to the temporary labels.


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Step 5 Check the status of the LEDs to ensure that the new board works properly.

NOTE

For details on the LEDs, see USCU.

Step 6 Determine whether related alarms are reported.

1. Query the active alarms of the board on the OM system.

2. If active alarms are reported, clear them according to the handling suggestion. If no alarm

is reported, go to Step 7.

Step 7 Select the type of clock source provided by the USCU and traced by the main control board onthe OM system.

Step 8 Unblock the new board on the OM system.

----End

PostrequisiteRecord the bar code of the replaced board.

Contact the local Huawei office to handle the faulty USCU.

Replacing the Optical Module

The optical module provides the electrical-optical interface for the optical transmission between

the BBU and other devices. During the replacement of the optical module, the optical cable is

removed. Thus, the CPRI signal transmission is disrupted.

Prerequisitel The number and types of faulty optical modules are determined, and new optical modules

are available.

l The installation positions of the faulty optical modules and optical cables are recorded. The

interconnection relations for the optical cables are also recorded.


bag are kept ready.

Context

The optical module can be installed in the CPRI0-CPRI5 ports on the GTMU.

The optical module is hot swappable.

It takes about five minutes to replace the optical module of the BBU. The duration of the

replacement involves the removal of the optical cable and the faulty optical module, the

installation of the new optical module, the connection of the optical cable to the optical module,

and the time elapsed for the restoration of the CPRI links.

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CAUTION

l You must take proper ESD prevention measures, for example, wear an ESD wrist strap or

a pair of ESD gloves to prevent the boards, modules, or electrical components from beingdamaged by static electricity generated by your body.

l Do not look into the optical module after removing the optical cable from the optical

module.

Procedure

Step 1 Press the bulge on the optical cable connector, and then remove the connector from the faultyoptical module.

Step 2 Turn the puller on the faulty optical module outwards, and then pull out the optical module from

the slot and also from the BBU.

Step 3 Install the new optical module into the BBU.

Step 4 Remove the dustproof caps from the optical connector and from the optical module, and theninsert the connector into the new module.

----End

Postrequisite

Contact the local Huawei office to handle the faulty optical module.

5.2 Replacing a DCDU-01 Module

The DCDU-01, installed under the BBU, supplies DC power for the cabinet and performs surge

protection. Replacing the DCDU-01 disrupts the services carried on the corresponding cabinet.

It takes about 20 minutes to replace the DCDU-01.

Prerequisite

l The model of the faulty DCDU-01 is confirmed and the new DCDU-01 of the same model

is available.

l The new DCDU-01 module is intact, and the hardware version of the new DCDU-01 is

consistent with that of the faulty DCDU-01.

l The tools and materials, such as an ESD wrist strap or a pair of ESD gloves, a Phillips

screwdriver, an ESD box or bag, and the key to the cabinet door, are available.

Context

CAUTION




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Procedure

Step 1 Power off the BTS3900.

Step 2 Mark the cables connected to the output ports on the DCDU-01, and then disconnect them.

Step 3 Use the Phillips screwdriver to remove the protection cover from the external power input wiringterminal block of the DCDU-01, as shown in Figure 5-1.

Figure 5-1 Removing the protection cover

(1) Protection cover (2) Screw (3) External input power cable

Step 4 Mark the external input power cable for the DCDU-01, and then disconnect the cable.

Step 5 Remove the four M6x12 screws on the two mounting ears of the DCDU-01, as shown in Figure

5-2.

Figure 5-2 Removing the screws on the two mounting ears of the module

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Step 6 Remove the DCDU-01 module by pulling out the DCDU-01 with one hand, and holding theDCDU-01 with the other hand.

Step 7 Put the faulty DCDU-01 into an ESD box.

Step 8 Install the new DCDU-01 into the position where the original one is located, and then use thefour removed M6x12 screws to fasten the DCDU-01 to the subrack.

Step 9 Insert the OT terminal of the power cable into the corresponding cable hole in the wiring terminalblock. Connect the OT terminal of the -48 V power cable (blue) to the terminal labeled NEG(-),

and then connect the OT terminal of the GND cable (black) to the terminal labeled RTN(+).

Step 10 Place the protection cover on the DCDU-01, and then tighten the screw on the protection coverby using the Phillips screwdriver.

Step 11 Remove the rubber covers from the DCDU-01 power sockets on the new DCDU-01 panel.

Step 12 Connect the removed cables to the power output ports on the DCDU-01 panel according to themarks.

Step 13 Power on the BTS3900.

----End

Postrequisite

After replacing the DCDU-01, perform the following operations:

l Check that the cable connections are correct and secure.

l Ensure that the related alarms are cleared on the M2000 or LMT after the equipment is

powered on.

l Contact the local Huawei office to handle the faulty DCDU-01 module.

5.3 Replacing the FAN Unit

The FAN unit works with the air inlet box in the cabinet to form a ventilation path. The FAN

unit provides forced ventilation and dissipation for the BBU and RFU. Replacing the FAN unit

may result in over-temperature alarms due to interruption of heat dissipation for the cabinet but

has no negative effect on services of the BTS. It takes about 20 minutes to replace a FAN unit.

Prerequisite

l A new FAN unit is ready.l Ensure that the new FAN unit is in good condition and the version of the new FAN unit is

consistent with that of the faulty FAN unit.

l The required tools and materials, such as ESD wrist strap, Phillips screwdriver, ESD box

or bag, and the key to the cabinet door, are available.


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Context

CAUTION

Take proper ESD prevention measures, for example, wear an ESD wrist strap or gloves to prevent

the boards, modules, and electronic components from being damaged by the static electricity

generated by human body.

Procedure

Step 1 Set the DC distribution switch FAN labeled on the DCDU-01 to OFF. Figure 5-3 shows theposition of the FAN unit switch on the DCDU-01.

Figure 5-3 Position of the FAN unit switch

Step 2 Label the cables on the panel of the FAN unit and then remove the cables.

Step 3 Loosen the captive screws on both sides of the adjustable cable trough. Then, raise the cabletrough and fix it at the upper mounting hole, as shown in Figure 5-4.

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Figure 5-4 Raising the adjustable cable trough

(1) Upper mounting hole (2) Captive screw

Step 4 Remove the four screws from the fan subrack, as shown in Figure 5-5.


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Figure 5-5 Removing the FAN unit

Step 5 Pull out the fan subrack by one-third of its length with one hand, hold the fan subrack with theother hand, and then pull the entire fan subrack out of the cabinet.

Step 6 Put the new FAN unit into the fan subrack. Then, secure the four screws on the fan subrack.

Step 7 Place the adjustable cable trough to its original position, and then tighten the captive screws onboth sides of the adjustable cable trough.

Step 8 Install the cables to the panel of the FAN unit based on the labels.

Step 9 Set the FAN unit switch on the DCDU-01 to ON.

----End

Postrequisite

After replacing the FAN unit, perform the following operations:

l Check the cables and ensure that they are correctly and tightly connected.

l Ensure the RUN LED on the panel is green and blinks at 0.5 Hz when the equipment is

powered on.

l Ensure that the related alarms are cleared after the equipment is powered on.

l Contact the local Huawei office to dispose of the faulty FAN unit.

5.4 Replacing the PMU

When the PMU is faulty and cannot be repaired in time, you must replace it.

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Prerequisite

l The type of faulty PMU is confirmed and the new PMU is ready.

l The new PMU is intact and its version is consistent with the version of the faulty PMU.

l The tools and materials are ready. The tools and materials are the ESD wrist strap or gloves,cross screwdriver, ESD box or bag, and key to the cabinet door.

Context

This module is hot swappable.

CAUTION

Take proper ESD prevention measures, for example, wearing an ESD wrist strap or a pair of

ESD gloves, to protect the PMU from electrostatic damage.

Procedure

Step 1 Disconnect the cables from the panel of the PMU, and then label the cables.

CAUTION

When inserting or removing the DB50 connector of the environment monitoring signal cable,

you must hold the connector with both hands and keep it perpendicular to the panel, to preventfalse alarms caused by bent pins.

Step 2 Loosen the screws on the handle of the PMU panel by using a screwdriver.

Step 3 Pull the handle gently to disconnect the buckle of the PMU from the subrack, and then removethe PMU from the slot, as shown in Figure 5-6.

Figure 5-6 Removing the PMU

Step 4 Set the DIP switch of the new PMU to 11000000, as shown in Figure 5-7.


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Figure 5-7 Set the DIP switch

Step 5 Loosen the screws on the handle of the PMU. Then, pull the handle outwards.

Step 6 Slide the PMU along the guide rails into the slot and then push the handle back.

Step 7 Tighten the screws on the handle, as shown in Figure 5-8.

Figure 5-8 Installing the PMU

Step 8 Connect the cables, which have been disconnected from the PMU, according to the labels.

----End

Postrequisite

After replacing the PMU, check the following items:

l The cables are correctly and tightly connected.

l The RUN LED on the panel blinks green at 0.5 Hz after the PMU is powered on.

l On the M2000 or LMT, the related alarms are cleared.

l Contact the local Huawei office to handle the faulty PMU.

5.5 Replacing a PSU

When a PSU is faulty and cannot be repaired in time, you must replace it.

Prerequisite

l The type of faulty PSU is confirmed and the new PSU is ready.

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l The new PSU is intact and its version is consistent with the version of the faulty PSU.

l The tools and materials are ready. The tools and materials are the ESD wrist strap or gloves,

cross screwdriver, ESD box or bag, and key to the cabinet door.

Context

This module is hot swappable.

CAUTION

Take proper ESD prevention measures, for example, wearing an ESD wrist strap or a pair of

ESD gloves, to protect the PSU from electrostatic damage.

Procedure

Step 1 Loosen the screws on the handle of the PSU panel by using a screwdriver.

Step 2 Pull the handle gently to disconnect the buckle of the PSU from the subrack, and then removethe PSU from the slot, as shown in Figure 5-9.

Figure 5-9 Removing the PSU

Step 3 Loosen the screws on the handle of the PSU. Then, pull the handle outwards.

Step 4 Slide the PSU along the guide rails into the slot and then push the handle back.

Step 5 Tighten the screws on the handle, as shown in Figure 5-10.

Figure 5-10 Installing the PSU

----End

Postrequisite

After replacing the PSU, check the following items:


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l The power LED on the PSU is ON (green) after the PSU is powered on.

l On the M2000 or LMT, the related alarms are cleared.

l Contact the local Huawei office to handle the faulty PSU.

5.6 Replacing the GATM

This describes how to replace the GSM antenna and TMA control module (GATM). The GATM

controls the RET antenna and supplies power to the TMA. The replacement of the GATM

disrupts the services carried on it.

Prerequisite

The required tools and materials, such as ESD wrist strap, cross screwdriver, ESD box or bag,

dustfree cotton cloth, and key to the cabinet door, are available.

Context

WARNING

Take proper ESD prevention measures, for example, wear ESD wrist straps or gloves to prevent

the boards, modules, and electronic components from being damaged by the static electricity

generated by human body.

Procedure

Step 1 Set the power switch on the DCDU that corresponds to the GATM to be replaced to OFF.

Step 2 Label the cables on the GATM, and then disconnect the cables.

Step 3 Use a cross screwdriver to loosen the four screws on the GATM panel, as shown in Figure5-11.

Figure 5-11 Loosening the screws

Step 4 Pull out the GATM by one-third of its length. Then, hold the GATM with one hand and removeit from the subrack.

Step 5 Place the removed GATM in an ESD box.

Step 6 Ensure that the new GATM is in good condition and that the hardware version of the new GATMis consistent with that of the faulty GATM.

Step 7 Install a new GATM. Hold the panel of the new GATM module with one hand and the bottomof the module with the other hand, and push it into the cabinet along the guide rail. Then, tighten

the screws on the mounting ears at the two sides of the module.

Step 8 Connect the cables to the ports on the new GATM panel based on the labels.

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Step 9 Set the power switch on the DCDU that corresponds to the new GATM to ON.

----End

Postrequisite1. Ensure that the RUN LED on the GATM panel is green and blinks slowly at 0.5 Hz after

the GATM is powered on.

2. Check that the related alarms on the M2000 or LMT are cleared after the GATM is powered

on.

3. Record the bar code, name, and PCB version of the faulty board.

4. Check whether there is obvious physical damage to the board. The damage may be burned

PCB, burned components, distorted connectors, bent pins, or broken pins.

5. Record the fault information, such as the cause, symptom, and site name.

6. Put the board into the ESD bag, and then put the bag into the board box. Keep it properly.

7. Contact the local Huawei office to dispose of the faulty board.

5.7 Replacing an RFU

The RFU is an RF filter unit, which is located in the RFC. Replacing an RFU disrupts all the

services carried on the RFU.

Prerequisite

l The model of the faulty RFU is confirmed, and a new RFU of the same model is ready.

l

The new RFU is intact, and its hardware version is consistent with that of the faulty RFU.l The tools and materials, such as an ESD wrist strap or a pair of ESD gloves, Phillips

screwdriver, ESD box or bag, dustfree cloth, RFU handle, key to the cabinet door, and

torque wrench, are ready.

Context

It takes about 6 to 10 minutes to replace an RFU, which involves disconnecting the cables,

removing screws, removing the faulty RFU, inserting a new RFU, tightening the screws,

connecting the cables to the new RFU, and loading software.

WARNING

l Take proper ESD protection measures, for example, wear an ESD wrist strap or a pair of

ESD gloves, to prevent electrostatic damage to the boards, modules, or electronic

components.

l The RFU is heavy. Therefore, handle it with caution.

Procedure

Step 1 Locate the faulty RFU, and then run the BLK BRD command on the LMT to block the faultyRFU.


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NOTE

Although this step can be performed either remotely or locally, you are advised to perform this step

remotely.

Step 2 Power off the RFU by setting the power switch on the DCDU-01 that corresponds to the faultyRFU to OFF.

Step 3 Remove the power cable of the faulty RFU, and then attach a temporary label to the cable.

Step 4 Use a torque wrench to loosen the DIN 7/16 male elbow connector of the RF jumper, removethe RF jumper, and then attach a temporary label to the jumper.

Step 5 Remove the CPRI cable from the RFU, and then attach a temporary label to the cable.

CAUTION

When removing the CPRI cable, do not look directly at the optical fiber. Otherwise, your eyes

may be hurt.

Step 6 Use a Phillips screwdriver to loosen the four screws on the RFU panel.

Step 7 Insert the standard handle delivered with the BTS into the lockhole at the center part of the RFUpanel. Turn the standard handle outwards by 90, and then pull out the module by holding the

standard handle firmly with one hand. Support the bottom of the the module with the other hand,

and then remove the module until it is completed removed from the subrack, as shown in Figure

5-12.

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Figure 5-12 Removing an RFU

Step 8 Place the faulty RFU in an ESD box.

Step 9 Place the new RFU on the corresponding guide rails, and then slide it along the rails until it isin position.

Step 10 Tighten the four captive screws at the four corners of the RFU to install the RFU securely onthe subrack.

Step 11 Insert the connector into the CPRI0 or CPRI1 port on the RFU according to the temporary labelon the CPRI cable.

Step 12 Fix the DIN 7/16 male elbow connector of the RF jumper to the ANT port on the RFU. Then,use a torque wrench to secure the DIN male elbow connector with the torque specification of

25 Nm to 35 Nm.

Step 13 Install the power cable of the RFU, and then tighten the screws.

Step 14 Set the corresponding DC output power switch on the panel of the DCDU to ON to power onthe RFU.

Step 15 Activate the RFU BootROM or software version.

1. Run the DSP BRDVERcommand to query the BootROM and software versions of the

new RFU.

2. If the software version is incorrect, run the ACT SOFTWARE command to reactivate the

BootROM or software version of the new RFU.


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Step 16 Run the UBL BRD command to unblock the RFU. Perform this step locally or remotely inaccordance with the way used in step 1 at the beginning of this procedure. That is, perform this

step locally if step 1 is performed locally.

----End

Postrequisite

1. Clear related alarms, if any, according to the alarm handling suggestions.

2. Check that the new RFU can provide the services properly.

3. Record the bar code, name, and PCB version of the faulty module.

4. Check whether there is obvious physical damage, for example, mechanical parts or plug-

ins are distorted, pins are bent or lost, or the PCB or components are burned.

5. Record the fault information, such as the cause, symptom, site name of the faulty module,

and slot number.

6. Place the faulty RFU into an ESD box and store it properly.

7. Contact the local Huawei office to handle the faulty RFU.

5.8 Replacing the BTS3900 Power Subrack

The power subrack is located in the lower part of the BTS3900 cabinet. It houses PSUs and PMU

and provides power input and output ports. It takes about 25 minutes to replace a power subrack.

Prerequisite

l The type of the faulty power subrack is confirmed and the new power subrack is ready.

l The tools and materials, such as an ESD wrist strap, Phillips screwdriver, ESD box or bag,

and key to the cabinet door, are ready.

Context

CAUTION

Take proper ESD protection measures, for example, wear an ESD wrist strap or a pair of ESDgloves, to prevent electrostatic damage to the boards, modules, or electronic components.

Procedure

Step 1 Power off the BTS3900.

Step 2 Record the connections of the cables on the panels of the power supply subrack and PMU, andthen disconnect the cables.

Step 3 Loosen the screws on the panel of the PMU/PSU in the power supply subrack, as shown inFigure 5-13.

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Figure 5-13 Removing the PMU/PSU

(1) Screws on the panel of the PMU (2) PMU (3) Power subrack

NOTE

Figure 5-13 takes the PMU for example. The positions of the two screws on the panel of the PSU are the

same as those on the panel of the PMU.

Step 4 Remove the faulty PMU or PSU along the guide rails by pulling the ejector lever on the panelof the PMU/PSU, as shown in Figure 5-13.

Step 5 Repeat Step 3 through Step 4 to remove all the PMU and PSUs in the power subrack, and thenput the removed PMU and PSUs into the ESD box or bag.

Step 6 Remove the four M6x12 screws from the mounting ears for the power subrack, as shown inFigure 5-14.


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Figure 5-14 Removing the screws from the mounting ears

Step 7 Pull the power subrack with one hand, and then hold the power subrack with the other hand untilit is removed.

Step 8 Put the removed power subrack into the ESD box or bag.

Step 9 Unpack the new power subrack, and then reversely perform the previous steps to install the newpower subrack and removed PMU and PSUs into the cabinet.

Step 10 Connect the removed cables to the ports on the panels of the power subrack and PMU accordingto the previous records.

Step 11 Power on the BTS3900.

----End

Postrequisite

After replacing the power subrack, perform the following operations:

l Check the cable connections and ensure that the cables are correctly and securely connected.

l Check on the M2000 or LMT that the related alarms are cleared after power-on.

l Contact the local Huawei office to handle the faulty power subrack.

BTS3900 GSM


BTS3900 GSM Site Maintenance Guide-(V300R008&R009_02)

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Transcript of BTS3900 GSM Site Maintenance Guide-(V300R008&R009_02)