BTS3900 WCDMA Site Maintenance Guide(V200_07)

BTS3900 WCDMA

V200

Site Maintenance Guide

Issue 07

Date 2009-08-30

Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.

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Huawei Technologies Co., Ltd.Address: Huawei Industrial Base

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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 writtenconsent 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. NoticeThe information in this document is subject to change without notice. Every effort has been made in thepreparation of this document to ensure accuracy of the contents, but the statements, information, andrecommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.

http://www.huawei.com

mailto:[email protected]

Contents

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

1 Changes in the BTS3900 WCDMA Site Maintenance Guide............................................1-1

2 Preparations for NodeB Site Maintenance............................................................................2-1

3 Hardware Items of BTS3900 Routine Maintenance............................................................3-13.1 Maintaining Items of the Equipment Room Environment of the NodeB.......................................................3-23.2 Power Supply and Grounding System Maintenance Items of the NodeB......................................................3-33.3 Maintenance of the Main Components in the BTS3900 ................................................................................3-4

4 Powering On/Off the BTS3900................................................................................................4-14.1 Powering On the BTS3900.............................................................................................................................4-24.2 Powering Off the BTS3900.............................................................................................................................4-4

5 Replacing Components of the BTS3900.................................................................................5-15.1 Replacing a BBU3900 Case............................................................................................................................5-35.2 Replacing a WMPT.........................................................................................................................................5-45.3 Replacing a WBBP..........................................................................................................................................5-55.4 Replacing a UPEU..........................................................................................................................................5-65.5 Replacing a UTRP...........................................................................................................................................5-75.6 Replacing a UBFA..........................................................................................................................................5-85.7 Replacing a DCDU-01 Module.....................................................................................................................5-105.8 Replacing the FAN Unit................................................................................................................................5-125.9 Replacing the PMU.......................................................................................................................................5-155.10 Replacing a PSU..........................................................................................................................................5-175.11 Replacing a WRFU Module........................................................................................................................5-195.12 Replacing the Power Supply Subrack of the BTS3900...............................................................................5-21

BTS3900 WCDMASite Maintenance Guide Contents

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Figures

Figure 4-1 DCDU-01 panel..................................................................................................................................4-2Figure 4-2 DCDU-01 panel..................................................................................................................................4-4Figure 5-1 Loosening the screws..........................................................................................................................5-7Figure 5-2 Loosening the screws..........................................................................................................................5-9Figure 5-3 Removing the protection cover.........................................................................................................5-11Figure 5-4 Removing the screws on the two mounting ears of the module.......................................................5-11Figure 5-5 Position of the FAN unit switch.......................................................................................................5-13Figure 5-6 Raising the adjustable cable trough .................................................................................................5-14Figure 5-7 Removing the FAN unit...................................................................................................................5-15Figure 5-8 Removing the PMU..........................................................................................................................5-16Figure 5-9 Set the DIP switch............................................................................................................................5-17Figure 5-10 Installing the PMU..........................................................................................................................5-17Figure 5-11 Removing the PSU.........................................................................................................................5-18Figure 5-12 Installing the PSU...........................................................................................................................5-18Figure 5-13 Position of the RFU........................................................................................................................5-20Figure 5-14 Removing the RFU.........................................................................................................................5-20Figure 5-15 Removing the PMU/PSU................................................................................................................5-22Figure 5-16 Removing the screws from the mounting ears...............................................................................5-23

BTS3900 WCDMASite Maintenance Guide Figures


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Tables

Table 3-1 Maintenance items of the equipment room environment of the NodeB..............................................3-2Table 3-2 Maintenance items of the power supply and grounding system of the NodeB....................................3-3Table 3-3 Maintenance items of the main components in the BTS3900..............................................................3-4Table 4-1 Power switches on the DCDU-01 panel...............................................................................................4-2Table 4-2 Checklist for power supply to the components in the cabinet..............................................................4-3Table 4-3 Power switches on the DCDU-01 panel...............................................................................................4-4

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About This Document

This document describes the routine hardware maintenance items of the BTS3900, such asmaintenance items concerning the cabinet, power supply and grounding system, and equipmentroom. The document also provides guidelines for replacing the components and boards of theBTS3900.

Product Version

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

Product Name Product Version

BTS3900 WCDMA (hereinafter referred toas BTS3900)

V200R010

V200R011

Intended Audience

This document is intended for:

l System engineers

l Site maintainers

Change History

For changes in the document, refer to 1 Changes in the BTS3900 WCDMA Site MaintenanceGuide.

Organization

1 Changes in the BTS3900 WCDMA Site Maintenance Guide

This describes the changes in the BTS3900 WCDMA Site Maintenance Guide.

2 Preparations for NodeB Site Maintenance

This describes the preparations for NodeB site maintenance. The preparations for sitemaintenance involve obtaining site information, selecting maintenance items, and arrangingmaintenance tools and spare parts.

3 Hardware Items of BTS3900 Routine Maintenance

BTS3900 WCDMASite Maintenance Guide About This Document


1

This describes the routine maintenance for the hardware items in the BTS3900. The hardwareitems that are routinely maintained refer to the equipment room environment of the NodeB,power supply and grounding system of the NodeB, and main components in the BTS3900.

4 Powering On/Off the BTS3900

When maintaining the BTS3900, you need to power on or power off the BTS3900. You mustpower on the BTS3900 according to the specific procedure and requirements, and you can poweroff the BTS3900 in a normal situation or in an emergency.

5 Replacing Components of the BTS3900

This describes how to replace the faulty BTS3900 components. The faulty components must bereplaced in time. The replaceable components in the BTS3900 are the BBU3900 case,BBU3900 board or module, DCDU-01, FAN module, PMU/PSU, SLPU, WRFU, andBTS3900 power subrack.

ConventionsSymbol 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 notavoided,will result in death or serious injury.

Indicates a hazard with a medium or low level of risk, whichif not avoided, could result in minor or moderate injury.

Indicates a potentially hazardous situation, which if notavoided,could result in equipment damage, data loss,performance degradation, or unexpected results.

Indicates a tip that may help you solve a problem or savetime.

Provides additional information to emphasize or supplementimportant 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 inboldface. For example, log in as user root.

Italic Book titles are in italics.

About This DocumentBTS3900 WCDMA


2 Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.

Issue 07 (2009-08-30)


Courier New Examples of information displayed on the screen are inCourier New.

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 byvertical bars. One item is selected.

[ x | y | ... ] Optional items are grouped in brackets and separated byvertical bars. One item is selected or no item is selected.

{ x | y | ... }* Optional items are grouped in braces and separated byvertical bars. A minimum of one item or a maximum of allitems can be selected.

[ x | y | ... ]* Optional items are grouped in brackets and separated byvertical 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 titlesare in boldface. For example, click OK.

> 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.

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Format Description

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 meansthe two keys should be pressed in turn.

Mouse Operations

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 movingthe pointer.

Double-click Press the primary mouse button twice continuously andquickly without moving the pointer.

Drag Press and hold the primary mouse button and move thepointer to a certain position.

About This DocumentBTS3900 WCDMA


4 Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.

Issue 07 (2009-08-30)

1 Changes in the BTS3900 WCDMA SiteMaintenance Guide

This describes the changes in the BTS3900 WCDMA Site Maintenance Guide.

07 (2009-08-30)This is the sixth commercial release.

Compared with the issue 06 (2009-08-15), the following part is modified.

5.2 Replacing a WMPT is modified.

06 (2009-08-15)This the fifth commercial release.

Compared with the issue 05 (2009-07-30), the document is optimized in diagrams.

05 (2009-07-30)This is the fourth commercial release.

Compared with the issue 04 (2009-07-15), the document is optimized in diagrams.

04 (2009-07-15)This is the third commercial release.

Compared with the issue 03 (2009-06-30), the following part is modified:

Replacing the USCU is added.

03 (2009-06-30)This is the second commercial release.

Compared with issue 02 (2009-6-30), the following parts are modified:

The description is revised according to the changes of the cabinet structure.

BTS3900 WCDMASite Maintenance Guide 1 Changes in the BTS3900 WCDMA Site Maintenance Guide


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02 (2009-06-20)This is the first commercial release.

Compared with issue 01 (2008-03-30), the following parts are modified:

The detail informations about replacing the board or module of the BBU3900 are added.

01 (2008-03-30)This is the initial field trial release.

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2 Preparations for NodeB Site Maintenance

This describes the preparations for NodeB site maintenance. The preparations for sitemaintenance involve obtaining site information, selecting maintenance items, and arrangingmaintenance tools and spare parts.

Obtaining Site Information

Before you maintain the NodeB 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 NodeB. The maintenanceitems are as follows:

l Maintaining the equipment room environment of the NodeB

l Maintaining power supply and grounding system of the NodeB

l Maintaining the main components in the NodeB

l Maintaining the antenna system of the NodeB

Arranging Tools and Spare Parts

Arrange the related maintenance tools and spare parts based on the site information andmaintenance items of the NodeB.

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

l The frequency test devices, which involve a frequency generator, a spectrum analyzer, andvarious connectors and cables.

l Power test devices used to test and analyze the output power of the NodeB. A commonlyused power test device, namely, a power meter.

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l The antenna and feeder test devices used to test the standing wave ratio, return loss, andcable insertion loss, and to locate faults. The commonly used antenna and feeder test deviceis the SiteMaster.

l Other devices– Multimeter

– Diagnosis tools for maintenance and test/test devices for robustness of the NodeB

– Local Maintenance Terminal (LMT)

– Rubidium clock (used to locate the clock of the NodeB)

– Spare parts

NOTE

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

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3 Hardware Items of BTS3900 RoutineMaintenance

About This Chapter

This describes the routine maintenance for the hardware items in the BTS3900. The hardwareitems that are routinely maintained refer to the equipment room environment of the NodeB,power supply and grounding system of the NodeB, and main components in the BTS3900.

3.1 Maintaining Items of the Equipment Room Environment of the NodeBThis provides the maintenance items, maintenance intervals, operation instructions, andreference standards of the NodeB equipment room environment.

3.2 Power Supply and Grounding System Maintenance Items of the NodeBThis provides the maintenance items, maintenance intervals, operation instructions, andreference standards of the NodeB power supply and grounding system.

3.3 Maintenance of the Main Components in the BTS3900This describes the maintenance items, maintenance interval, operating instruction, and referencestandard of the main components in the BTS3900.

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3.1 Maintaining Items of the Equipment RoomEnvironment of the NodeB

This provides the maintenance items, maintenance intervals, operation instructions, andreference standards of the NodeB equipment room environment.

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

Table 3-1 Maintenance items of the equipment room environment of the NodeB

Item Interval Operating Instruction Reference Standard

Checkingenvironmentalalarms

Daily Check whether powersupply alarms, fire alarms,or smoke alarms arereported.

No power supply alarms,fire alarms, or smokealarms are reported.

Checking thetemperature inthe equipmentroom

Weekly Record the temperature readon the thermometer in theequipment room.

-20℃ to +50℃

Checking thetemperature inthe equipmentroom

Weekly Record the humidity read onthe hygrometer in theequipment room.

5% to 85%

Checking theillumination inthe equipmentroom

Every twomonths

Check whether the routineand emergency illuminationin the equipment room isnormal.

-

Checking the airconditioner

Every twomonths

Check whether the airconditioner is workingnormally.

-

Checkingprotectivedevices

Every twomonths

Check whether anti-disasterdevices, equipmentprotection devices, and fire-protection devices are ingood condition.

l The foam extinguisher ordry powder fireextinguisher is installedin the equipment room.In addition, the pressureand period of validity ofthe extinguisher meet therequirement.

l There is no danger ofdamage to the equipmentby rats or insects.

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Cleaning theequipmentroom

Every twomonths

Check whether cabinets,equipment housing,equipment interior, tables,floor, doors, and windowsare clean.

All the items to be checkedare clean.

3.2 Power Supply and Grounding System MaintenanceItems of the NodeB

This provides the maintenance items, maintenance intervals, operation instructions, andreference standards of the NodeB power supply and grounding system.

Table 3-2 lists the routine maintenance items for the power supply and the grounding systemof the NodeB.

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

Item Interval OperatingInstruction

Reference Standard

Checking powercables

Monthly Check the connectionsof power cablescarefully.

The power cables are notaging, and there is nocorrosion on theconnection points.

Checking thevoltage

Monthly Measure the voltage ofthe power supply byusing a multimeter.

The voltage is withinstandard range.

Checking PGNDcables

Monthly Check whether thePGND cable andgrounding bar areconnected properly.

The connections of thePGND cable are sound. Itis not aging. Theconnection points aresound with no corrosionon them.

Earth resistance Monthly Measure the earthresistance by using anelectric earth resistancetester and keep a record.

The grounding resistanceof the cabinet is smallerthan 10 ohms.

Checking thestorage batteries

Yearly Check the storagebatteries and rectifiersevery year.

The battery capacity iswithin the normal rangeand the batteries arecorrectly connected. Theperformance parametersof rectifiers are normal.



3-3

3.3 Maintenance of the Main Components in the BTS3900This describes the maintenance items, maintenance interval, operating instruction, and referencestandard of the main components in the BTS3900.

Table 3-3 describes the maintenance items of the main components in the BTS3900.

Table 3-3 Maintenance items of the main components in the BTS3900


Checking thefans

Monthly Check whether the fans areoperational.

The fans work properlywithout exceptionalsounds generated byfrictions between theblades of the fan and thesubrack.

Checking theair filter

Quarterly If there is too much dust on theair filter, clean the air filter.

-

Checking theexterior of thecabinet

Quarterly Check whether there are dents,cracks, holes, or corrosion onthe surface of the cabinet andwhether the cabinet label islegible.

-

Checking thelock and doorof the cabinet

Quarterly Check whether the lock isnormal and the door can beopened and closed easily.

-

Checking thecleanness ofthe cabinet

Quarterly Check whether the cabinet isclean.

The cabinet surface isclean. The subracks arenot dusty.

Checking thefan box

Annually If there is too much dust on thesurface of or inside the fan box,clean the fan box.

-

CheckingLEDs on theboards

Monthly Check whether the LEDs on theboards are normal.

For details about thestatus of LEDs, see thehardware descriptionabout the correspondingboards.

Checking theESD wriststrap

Quarterly Use either of the followingmethods:l Use an ESD wrist strap tester

to test the ESD wrist strap.l Use a multimeter to test the

earth resistance of the ESDwrist strap.

l If you are using anESD wrist strap tester,the LED GOOD is on.

l If you are using amultimeter, the earthresistance is between0.75 megohm and 10megohms.

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4 Powering On/Off the BTS3900

About This Chapter

When maintaining the BTS3900, you need to power on or power off the BTS3900. You mustpower on the BTS3900 according to the specific procedure and requirements, and you can poweroff the BTS3900 in a normal situation or in an emergency.

4.1 Powering On the BTS3900This describes how to power on the BTS3900.

4.2 Powering Off the BTS3900This describes how to power off the BTS3900 in a normal situation and in an emergency. Youmust power off the BTS3900 in a normal situation such as moving the equipment or anticipatinga territorial blackout. You must also power off the BTS3900 in an emergency such as a fire,smoke, or water immersion occurs in the equipment room.

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4.1 Powering On the BTS3900This describes how to power on the BTS3900.

Prerequisitel The power switches on the DCDU-01 of the BTS3900 are all set to OFF.

l The power supply to the BTS3900 is cut off.

l The components to be replaced in the BTS3900 are replaced.

Context

Figure 4-1 shows the power switches on the DCDU-01 panel.

Figure 4-1 DCDU-01 panel

Table 4-1 lists the power switches on the DCDU-01 panel.

Table 4-1 Power switches on the DCDU-01 panel

Module Power Switch

SPARE2

BBU BBU

Standby BBU SPARE1

FAN FAN

RFU in slot 0 RFU0

RFU in slot 1 RFU1

RFU in slot 2 RFU2

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Module Power Switch

RFU in slot 3 RFU3

RFU in slot 4 RFU4

RFU in slot 5 RFU5

NOTE

The RFUs are in slots 0 to 5 from left to right.

Procedure

Step 1 Set the main power switch of the BTS3900 to ON.

Step 2 Set the DC power switch labeled FAN on the DCDU-01 panel to ON.

Step 3 Set the DC power switch labeled BBU on the DCDU-01 panel to ON.

NOTE

If a standby BBU is configured, set the DC power distribution switch labeled SPARE1 on the DCDU-01panel to ON so that the standby BBU is powered on.

Step 4 Set the DC power switches labeled RFU0 to RFU5 on the DCDU-01 panel to ON.

----End

Postrequisite

After the components are powered on, you must check whether the power supply to thecomponents are normal according to Table 4-2.

Table 4-2 Checklist for power supply to the components in the cabinet

Component LED Status

FAN RUN LED is green and blinks every other second.

BBU

WMPT RUN LED is steady green or blinks every othersecond.

UBFA STATE LED is green and blinks every other second.

UPEU RUN LED is steady green.

UPEB RUN LED is steady green.

UTRP RUN LED is steady green or blinks every othersecond.

WBBP RUN LED is steady green or blinks every othersecond.

RFU0 to RFU5 RUN LED is green and blinks every other second.



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Component LED Status

PMU STATE LED is green and blinks every other secondor blinks every other 0.125 second.

PSU Power input LED is steady green.

NOTE

l If the RUN LED of the WMPT, UTRP, or WBBP board is steady green, you can infer that the powersupply to the board is normal, but the board is faulty.

l If the RUN LED of the PMU is green and blinks every other 0.125 second, you can infer that the PMUworks properly, but the communication with the RNC fails.

4.2 Powering Off the BTS3900This describes how to power off the BTS3900 in a normal situation and in an emergency. Youmust power off the BTS3900 in a normal situation such as moving the equipment or anticipatinga territorial blackout. You must also power off the BTS3900 in an emergency such as a fire,smoke, or water immersion occurs in the equipment room.

Context

Figure 4-2 shows the power switches on the DCDU-01 panel.

Figure 4-2 DCDU-01 panel

Table 4-3 lists the power switches on the DCDU-01 panel.

Table 4-3 Power switches on the DCDU-01 panel

Module Power Switch

SPARE2

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Module Power Switch

BBU BBU

Standby BBU SPARE1

FAN FAN

RFU in slot 0 RFU0

RFU in slot 1 RFU1

RFU in slot 2 RFU2

RFU in slot 3 RFU3

RFU in slot 4 RFU4

RFU in slot 5 RFU5

NOTE

The RFUs are in slots 0 to 5 from left to right.

Procedurel Power off the BTS3900 in a normal situation.

1. Set the DC power distribution switches labeled RFU0 to RFU5 on the DCDU-01 toOFF.

2. Set the DC power distribution switch labeled BBU on the DCDU-01 to OFF.3. Set the DC power distribution switch labeled FAN on the DCDU-01 to OFF.4. Set the DC power distribution switches labeled SPARE1 and SPARE2 on the

DCDU-01 to OFF.5. Set the main power switch to OFF.

l Power off the BTS3900 in an emergency.

CAUTIONPowering off the BTS3900 in an emergency may damage the equipment or boards. Do notuse this method in any situation other than in an emergency.

1. Set the main power switch to OFF.2. Set all the DC power distribution switches on the DCDU-01 to OFF if time permits.

----End



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5 Replacing Components of the BTS3900

About This Chapter

This describes how to replace the faulty BTS3900 components. The faulty components must bereplaced in time. The replaceable components in the BTS3900 are the BBU3900 case,BBU3900 board or module, DCDU-01, FAN module, PMU/PSU, SLPU, WRFU, andBTS3900 power subrack.

5.1 Replacing a BBU3900 CaseThis describes how to replace a BBU3900 case. The BBU3900, which is a core module of theNodeB, processes baseband signals of the entire NodeB system and provides transport interfacesfor communication with other NEs, namely, RNC, RRU, WRFU. Replacing the BBU3900interrupts all the services carried by the NodeB.

5.2 Replacing a WMPTThe WMPT is the BBU3900 main control and transmission board, replacing the WMPT disruptsall the services carried by the NodeB.

5.3 Replacing a WBBPReplacing a WBBP disrupts all the services carried by the NodeB.

5.4 Replacing a UPEUThe UPEU is the power module of the BBU and provides power for the boards in the BBU. TheUPEU supports the -48/+24V V DC input. During the replacement of the UPEU, the BBU ispowered off and the ongoing-services are disrupted.

5.5 Replacing a UTRPThe UTRP is the BBU3900 main control and transmission board, replacing the UTRP disruptsall the services carried by the NodeB.

5.6 Replacing a UBFAThe UBFA is the fan module in the BBU. The UBFA and the air inlet box in the BBU form aventilation loop, implementing forced heat dissipation for the BBU. During the replacement ofthe UBFA, the heat generated by the BBU cannot be properly ventilated and, with temperatureincrease, an overtemperature alarm is reported. The services, however, are not affected.

5.7 Replacing a DCDU-01 Module

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The DCDU-01, installed under the BBU, supplies DC power for the cabinet and has the functionof surge protection. Replacing the DCDU-01 disrupts the services carried on the correspondingcabinet. It takes about 20 minutes to replace the DCDU-01.

5.8 Replacing the FAN UnitThe FAN unit works with the air inlet box in the cabinet to form a ventilation path. The FANunit provides forced ventilation and dissipation for the BBU and RFU. Replacing the FAN unitmay result in over-temperature alarms due to interruption of heat dissipation for the cabinet buthas no negative effect on services of the BTS. It takes about 20 minutes to replace a FAN unit.

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

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

5.11 Replacing a WRFU ModuleThis describes how to replace WRFU. The WRFU is located on the top of the BTS3900 cabinet.The WRFU provides the following functions: modulation and demodulation of baseband or RFsignals, data processing, and signal combination and division. The replacement of the WRFUdisrupts the services carried on it. It takes about 10 minutes to replace a RFU module.

5.12 Replacing the Power Supply Subrack of the BTS3900The power supply subrack is located in the lower cabinet of the BTS3900. It can be installedwith the PSU and PMU to provide the power input and output ports. It takes about 25 minutesto replace the power supply subrack.

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5.1 Replacing a BBU3900 CaseThis describes how to replace a BBU3900 case. The BBU3900, which is a core module of theNodeB, processes baseband signals of the entire NodeB system and provides transport interfacesfor communication with other NEs, namely, RNC, RRU, WRFU. Replacing the BBU3900interrupts all the services carried by the NodeB.

PrerequisiteThe tools and materials, such as the ESD wrist strap or gloves, cross screwdriver, ESD box orbag, and key to the cabinet door are ready.

Procedure

Step 1 Run ULD CFGFILE on the LMT to upload the NodeB data configuration file to the LMTmaintenance computer.

Step 2 Power off the BBU3900 by referring to Powering Off the BBU3900, and turn off the powerswitch of the external power supply to the BBU3900.

Step 3 Label the BBU3900 cables, disconnect them, and then take insulation measures for the cables.NOTE

Disconnect the BBU3900 cables in the sequence of the power cable, alarm cable, FE cable, E1 cable, CPRIoptical cable, and PGND cable.

Step 4 Use the cross screwdriver to remove the four panel screws.

Step 5 Pull the faulty BBU3900 case out of the cabinet.

Step 6 Insert a new BBU3900 case into the slot. Then, push the new BBU3900 case until it is in position.

Step 7 Tighten the panel screws to secure the new BBU3900 case.

Step 8 Connect the cables to the BBU in turn according to the labels.

Step 9 Turn on the power switch of the external power supply to the BBU3900. Then, power on theBBU3900 by referring to Powering on the BBU3900.

Step 10 On the LMT, run the DLD CFGFILE command to download the NodeB data configuration fileto the new BBU3900.

Step 11 Run LST VER to query the software version and the BootROM version. If it is not correct,update the version.

Step 12 Run RST NODEB to restart the NodeB.

----End

PostrequisiteAfter replacing the faulty BBU3900 case, check the following items:l On the M2000 or LMT, the related alarms are cleared.

l A UE can access the cell carried by the BBU3900.

Contact the local Huawei office to handle the faulty BBU3900 case.



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5.2 Replacing a WMPTThe WMPT is the BBU3900 main control and transmission board, replacing the WMPT disruptsall the services carried by the NodeB.

Prerequisitel The status of the LEDs on the faulty WMPT and cable connections on the panel are

recorded.l Obtain the board operation logs and history alarms prior to the generation of the alarm.

l Obtain the board operation log.

l The tools and materials, such as an ESD wrist strap or a pair of ESD gloves, Phillipsscrewdriver, ESD box or bag, dustfree cloth, and key to the cabinet door are ready.

Contextl The BBU3900 is configured with one active WMPT. Replacing the WMPT disrupts all the

services carried by the NodeB. Therefore, power off the NodeB before replacement.l The BBU3900 is configured with one active WMPT and one standby WMPT. When the

active WMPT is being replaced, an active/standby fail is performed automatically. Afterthe fail is successful, the standby WMPT becomes the active WMPT and takes over theservices, and the new WMPT becomes the standby WMPT. Powering off the NodeB is notrequired during replacement. Replacing the standby WMPT does not disrupt the services.When replacing the board, do not power off the NodeB. You only need to remove the faultyboard, and then insert a new board into the original slot.

CAUTIONThe active/standby fail may result in NodeB resetting or service disruption.

Procedure

Step 1 On the NodeB LMT, run the ULD CFGFILE command to upload the NodeB data configurationfile to the LMT computer.

Step 2 Remove the faulty WMPT.1. Attach temporary labels to the cables on the faulty WMPT, and then disconnect the cables.2. Loosen the screws on the panel of the faulty WMPT.3. Turn the ejector lever outwards, and then pull the faulty WMPT out of the slot.4. Place the faulty WMPT in an ESD bag.

Step 3 Install a new WMPT.1. Insert a new WMPT into the slot, and then slide the board until it is in position.2. Turn the ejector levers inwards, and then tighten the screws on the panel of the new WMPT.3. Connect the cables to the ports on the panel of the new WMPT according to the recorded

cable connections.




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Step 4 Run the DLD CFGFILE command to download the backup data configuration files on the NodeBLMT to the new BBU3900

Step 5 Check the running status of the new WMPT.1. When the board is operational, the RUN LED blinks at 0.5 Hz, and the AL LED is OFF.2. If the board works in active mode, the ACT LED is ON. If the board does not work or

works in standby mode, the ACT LED is OFF.

NOTEFor details on the LED of the WMPT, see the WMPT.

Step 6 Check and ensure that the board version is consistent with the latest version in the existingnetwork. If the version is earlier than the version in the existing network, upgrade the software.

----End

Postrequisitel Record the bar code of the replaced board.

l Contact the local Huawei office to handle the faulty board or module.

5.3 Replacing a WBBPReplacing a WBBP disrupts all the services carried by the NodeB.

PrerequisiteThe tools and materials, such as an ESD wrist strap or a pair of ESD gloves, Phillips screwdriver,ESD box or bag, dustfree cloth, and key to the cabinet door are ready.

Procedure

Step 1 On the LMT, run the BLK BRD command to block the faulty WBBP.

Step 2 Remove the faulty WBBP.1. Attach temporary labels to the cables on the faulty WBBP, and then disconnect the cables.2. Loosen the screws on the panel of the faulty WBBP.3. Turn the ejector lever outwards, and then pull the faulty WBBP out of the slot.4. Place the faulty WBBP in an ESD bag.

Step 3 Install a new WBBP.1. Insert a new WBBP into the slot, and then slide the board until it is in position.2. Turn the ejector levers inwards, and then tighten the screws on the panel of the new WBBP.3. Connect the cables to the ports on the panel of the new WBBP according to the recorded

cable connections.

Step 4 Check the running status of the new WBBP.

NOTEFor details on the LEDs of the WBBP, see the WBBP.

Step 5 Check whether related alarms are reported.



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1. On the LMT or M2000 client, run the LST ALMAF command to query active alarms.2. If active alarms are reported, clear them according to handling suggestions. If no active

alarm is reported, go to Step 6.

Step 6 Activate the BootROM or software version of the new WBBP.1. Run the DSP BRDVER command to check whether the BootROM or software version of

the new WBBP is correct.2. If the BootROM or software version is incorrect, run the ACT SOFTWARE command to

activate the BootROM or software version of the board.

Step 7 On the LMT, run the UBL BRD command to unblock the new WBBP.

----End

Postrequisite

Contact the local Huawei office to handle the faulty WBBP.

5.4 Replacing a UPEUThe UPEU is the power module of the BBU and provides power for the boards in the BBU. TheUPEU supports the -48/+24V V DC input. During the replacement of the UPEU, the BBU ispowered off and the ongoing-services are disrupted.

Prerequisitel 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.

Context

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

CAUTIONTake correct ESD prevention measures, such as wearing an ESD wrist strap or ESD gloves, toavoid static damage to boards, modules, and electronic components.

Procedure

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

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




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Step 3 Loosen the screws on the panel of the UPEU, as shown in Figure 5-1.

Figure 5-1 Loosening the screws

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 BBU.

Step 10 Check the running status of the new UPEU.

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

----End

PostrequisiteContact the local Huawei office to handle the faulty UPEU.

5.5 Replacing a UTRPThe UTRP is the BBU3900 main control and transmission board, replacing the UTRP disruptsall the services carried by the NodeB.

PrerequisiteThe tools and materials, such as an ESD wrist strap or a pair of ESD gloves, Phillips screwdriver,ESD box or bag, dustfree cloth, and key to the cabinet door are ready.

Contextl The BBU3900 is configured with one active UTRP. Replacing the UTRP disrupts all the

services carried by the NodeB. Therefore, power off the NodeB before replacement.l The BBU3900 is configured with one active UTRP and one standby UTRP. When the active

UTRP is being replaced, an active/standby fail is performed automatically. After the failis successful, the standby UTRP becomes the active UTRP and takes over the services, and



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the new UTRP becomes the standby UTRP. Powering off the NodeB is not required duringreplacement. Replacing the standby UTRP does not disrupt the services. When replacingthe board, do not power off the NodeB. You only need to remove the faulty board, and theninsert a new board into the original slot.

CAUTIONThe active/standby fail may result in NodeB resetting or service disruption.

Procedure

Step 1 Remove the faulty UTRP.

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

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

3. Turn the ejector lever outwards, and then pull the faulty UTRP out of the slot.

4. Place the faulty UTRP in an ESD bag.

Step 2 Install a new UTRP.

1. Insert a new UTRP into the slot, and then slide the board until it is in position.

2. Turn the ejector levers inwards, and then tighten the screws on the panel of the new UTRP.

3. Connect the cables to the ports on the panel of the new UTRP according to the recordedcable connections.

Step 3 Check the running status of the new UTRP.

1. When the board is operational, the RUN LED blinks at 0.5 Hz, and the AL LED is OFF.

2. If the board works in active mode, the ACT LED is ON. If the board does not work orworks in standby mode, the ACT LED is OFF.

NOTEFor details on the LED of the UTRP, see the UTRP.

----End

PostrequisiteContact the local Huawei office to handle the faulty board or module.

5.6 Replacing a UBFAThe UBFA is the fan module in the BBU. The UBFA and the air inlet box in the BBU form aventilation loop, implementing forced heat dissipation for the BBU. During the replacement ofthe UBFA, the heat generated by the BBU cannot be properly ventilated and, with temperatureincrease, an overtemperature alarm is reported. The services, however, are not affected.

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




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

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

CAUTIONl 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.

l Replacing the UBFA causes the temperature of the BBU increases, which results in theovertemperature alarm.

Procedure

Step 1 Loosen the screws on the panel of the UBFA, as shown in Figure 5-2.

Figure 5-2 Loosening the screws

Step 2 Remove the faulty UBFA from the slot.



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CAUTIONIf one or more fans are still rotating in the faulty FAN unit, do not touch the rotating fans withhands to avoid being hurt after the FAN unit are 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.NOTEFor details on the LED of the UBFA, see the UBFA.

----End

PostrequisiteContact the local Huawei office to handle the faulty UBFA.

5.7 Replacing a DCDU-01 ModuleThe DCDU-01, installed under the BBU, supplies DC power for the cabinet and has the functionof surge protection. Replacing the DCDU-01 disrupts the services carried on the correspondingcabinet. It takes about 20 minutes to replace the DCDU-01.

Prerequisitel 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

CAUTIONTake 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.

ProcedureStep 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 5-3.




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Figure 5-3 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 strews on the two mounting ears of the DCDU-01, as shown in Figure5-4.

Figure 5-4 Removing the screws on the two mounting ears of the module

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.



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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

PostrequisiteAfter 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 ispowered on.

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

5.8 Replacing the FAN UnitThe FAN unit works with the air inlet box in the cabinet to form a ventilation path. The FANunit provides forced ventilation and dissipation for the BBU and RFU. Replacing the FAN unitmay result in over-temperature alarms due to interruption of heat dissipation for the cabinet buthas no negative effect on services of the BTS. It takes about 20 minutes to replace a FAN unit.

Prerequisitel 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 isconsistent with that of the faulty FAN unit.

l The required tools and materials, such as ESD wrist strap, Phillips screwdriver, ESD boxor bag, and the key to the cabinet door, are available.

Context

CAUTIONTake proper ESD prevention measures, for example, wear an ESD wrist strap or gloves to preventthe boards, modules, and electronic components from being damaged by the static electricitygenerated by human body.




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Procedure

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

Figure 5-5 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 5-6.



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Figure 5-6 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 5-7.




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Figure 5-7 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

PostrequisiteAfter 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 ispowered 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.

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



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Prerequisitel 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.

CAUTIONTake proper ESD prevention measures, for example, wearing an ESD wrist strap or a pair ofESD 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.

CAUTIONWhen 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 flathead 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 5-8.

Figure 5-8 Removing the PMU

Step 4 Set the DIP switch of the new PMU to 11000000, as shown in Figure 5-9.




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Figure 5-9 Set the DIP switch

Step 5 Place the new PMU in the corresponding slot and 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 5-10.

Figure 5-10 Installing the PMU

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

----End

PostrequisiteAfter 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.

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



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

ContextThis module is hot swappable.

CAUTIONTake proper ESD prevention measures, for example, wearing an ESD wrist strap or a pair ofESD gloves, to protect the PSU from electrostatic damage.

ProcedureStep 1 Loosen the screws on the handle of the PSU panel by using a flathead 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 5-11.

Figure 5-11 Removing the PSU

Step 3 Place the new PSU in the corresponding slot and 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 5-12.

Figure 5-12 Installing the PSU




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----End

PostrequisiteAfter replacing the PSU, check the following items:

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.

5.11 Replacing a WRFU ModuleThis describes how to replace WRFU. The WRFU is located on the top of the BTS3900 cabinet.The WRFU provides the following functions: modulation and demodulation of baseband or RFsignals, data processing, and signal combination and division. The replacement of the WRFUdisrupts the services carried on it. It takes about 10 minutes to replace a RFU module.

Prerequisitel The type of the faulty WRFU module is obtained, and a new WRFU module is available.

l The new WRFU module is intact and the hardware version of the new WRFU is consistentwith that of the faulty WRFU module.

l The required tools and materials are ready. They are a torque wrench, an ESD wrist strap,a Phillips screwdriver, an ESD box or bag, dustfree cloth, the key to the cabinet door, andthe standard handle.

Context

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

to prevent the boards, modules, and electronic components from being damaged by the staticelectricity generated by the human body.

l Hold the RFU module with care as it is heavy.

Procedure

Step 1 Locate the faulty RFU and then run the BLK BRD command on the LMT to disable the faultyWRFU.

NOTE

This step can be performed either locally or remotely. Remote maintenance is suggested, though.

Step 2 Set the RFU switch on the DCDU-01 that corresponds to the RFU to OFF. The position of theRFU is shown in Figure 5-13.



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Figure 5-13 Position of the RFU

Step 3 Label the cables connected to the RFU panel, and then disconnect the cables.

Step 4 Use a Phillips screwdriver to loosen the four captive screws on the RFU panel.

Step 5 Insert the standard handle into the RFU to the corresponding keyhole on the RFU panel, andturn the handle key by 90°. Pull out the module by holding the handle key using one hand, andthen remove the RFU using the other hand, as shown in Figure 5-14.

Figure 5-14 Removing the RFU

Step 6 Slide the new RFU along its guide rail until the module is in position (with obvious resistance).




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Step 7 Tighten the four captive screws at four corners on the RFU panel so as to connect the RFUsecurely to the subrack.

Step 8 Install the cables to the ports on the RFU panel according to the labels.

Step 9 Set the RFU switch on the DCDU-01 that corresponds to the RFU to ON.

Step 10 Activate the BootROM or the software version of the new WRFU.

1. Run the DSP BRDVER command to check whether the BootROM or the software versionof the new WRFU are correct on the LMT.

2. If the software version is incorrect, run the ACT SOFTWARE command to reactivate theBootROM or the software version of the WRFU on the LMT.

Step 11 On the LMT, run the UBL BRD command to unblock the board.

----End

PostrequisiteAfter replacing the RFU module, verify the following items:

l The cable connections are correct and secure.

l After the RFU module is powered on, the RUN LED on the panel is green and blinks at0.5 Hz.

l On the M2000 or the LMT, the alarms related to the RFU module are cleared after the RFUmodule is powered on.

l Contact the local Huawei office to handle the faulty RFU module.

5.12 Replacing the Power Supply Subrack of the BTS3900The power supply subrack is located in the lower cabinet of the BTS3900. It can be installedwith the PSU and PMU to provide the power input and output ports. It takes about 25 minutesto replace the power supply subrack.

Prerequisitel Confirm the model of the faulty power supply subrack and have the new power supply

subrack of the same type ready.

l The required tools and materials, such as ESD wrist strap, Phillips screwdriver, ESD boxor bag, and the key to the cabinet door, are available.

Context

CAUTIONTake proper ESD prevention measures, for example, wear an ESD wrist strap or gloves to preventthe boards, modules, and electronic components from being damaged by the static electricitygenerated by human body.



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Procedure

Step 1 Power off the BTS3900.

Step 2 Mark the cables on the power supply subrack and the PMU, and then disconnect them.

Step 3 Loosen the two screws on the panel of the PMU/PSU in the power supply subrack, as shown inFigure 5-15.

Figure 5-15 Removing the PMU/PSU

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

NOTE

Figure 5-15 shows the PMU, because the position of the two screws on the PSU panel is the same as thaton the PMU panel.

Step 4 Pull out the PMU or PSU along the guide rails by holding the ejector lever on the PMU/PSUpanel, as shown in Figure 5-15.

Step 5 Repeat Step 3 through Step 4 to remove all the PMUs/PSUs from the power supply subrack,and then put them into the ESD box.

Step 6 Remove the four M6x12 strews on the two mounting ears of the power supply subrack, as shownin Figure 5-16.




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Figure 5-16 Removing the screws from the mounting ears

Step 7 Pull out the power supply subrack with one hand, hold the power supply subrack with the otherhand, and then remove it.

Step 8 Put the faulty power supply subrack into an ESD box.

Step 9 Reversely perform the previous steps to install the new power supply subrack and removedPMUs/PSUs into the cabinet.

Step 10 Connect the removed cables to the ports on the panel of the power supply subrack and on thatof the PMU according to the marks.

Step 11 Power on the BTS3900.

----End

PostrequisiteAfter replacing the power supply subrack, perform the following operations:l Check the cables and ensure that they are correctly and tightly connected.

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

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



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BTS3900 WCDMA Site Maintenance Guide(V200_07)

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