Bts3900 Site Maintenance Guide(V200 01)

BTS3900

V200

Site Maintenance Guide

Issue 01

Date 2008-04-30

Part Number

Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd

Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. For anyassistance, please contact our local office or company headquarters.

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

Bantian, LonggangShenzhen 518129People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Copyright © Huawei Technologies Co., Ltd. 2008. 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 Safety Information.....................................................................................................................1-11.1 Safety Precautions...........................................................................................................................................1-11.2 Electricity Safety.............................................................................................................................................1-31.3 Inflammable Environment...............................................................................................................................1-51.4 Battery.............................................................................................................................................................1-51.5 Radiation.........................................................................................................................................................1-71.6 Working at Heights.........................................................................................................................................1-91.7 Mechanical Safety.........................................................................................................................................1-111.8 Others............................................................................................................................................................1-12

2 NodeB Site Maintenance Preparation....................................................................................2-1

3 BTS3900 Routine Hardware Maintenance Items.................................................................3-13.1 NodeB Equipment Room Maintenance Items.................................................................................................3-23.2 Maintenance Items of the NodeB Power Supply and Grounding System......................................................3-23.3 BTS3900 Cabinet Maintenance Items.............................................................................................................3-3

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 Board or Module of the BBU3900..............................................................................................5-45.3 Replacing a DCDU-01....................................................................................................................................5-55.4 Replacing a FAN Module...............................................................................................................................5-75.5 Replacing a PMU/PSU....................................................................................................................................5-95.6 Replacing an SLPU.......................................................................................................................................5-125.7 Replacing a WRFU.......................................................................................................................................5-135.8 Replacing the BTS3900 Power Subrack.......................................................................................................5-17

BTS3900Site Maintenance Guide Contents

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Figures

Figure 1-1 Wearing an ESD wrist strap...............................................................................................................1-5Figure 1-2 Lifting a weight................................................................................................................................1-10Figure 1-3 Slant angle........................................................................................................................................1-11Figure 1-4 One meter higher than the eave........................................................................................................1-11Figure 4-1 DCDU-01 panel..................................................................................................................................4-2Figure 4-2 DCDU-01 panel..................................................................................................................................4-4Figure 5-1 Removing the protecting hood...........................................................................................................5-6Figure 5-2 Removing the screws from the mounting ears...................................................................................5-6Figure 5-3 FAN switch on the DCDU-01 panel...................................................................................................5-8Figure 5-4 Lifting the movable cable trough .......................................................................................................5-8Figure 5-5 Removing the FAN module................................................................................................................5-9Figure 5-6 Removing the PMU/PSU..................................................................................................................5-10Figure 5-7 DIP switch on the PMU....................................................................................................................5-11Figure 5-8 Loosening the screws on the new PMU panel..................................................................................5-12Figure 5-9 RFU switches on the DCDU-01.......................................................................................................5-14Figure 5-10 Loosening the captive screws.........................................................................................................5-15Figure 5-11 Removing the WRFU.....................................................................................................................5-16Figure 5-12 Removing the PMU/PSU................................................................................................................5-18Figure 5-13 Removing the screws from the mounting ears...............................................................................5-19

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Tables

Table 3-1 NodeB equipment room maintenance items........................................................................................3-2Table 3-2 Maintenance items of the NodeB power supply and grounding system..............................................3-3Table 3-3 BTS3900 cabinet maintenance items...................................................................................................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...............................................................................................4-4Table 5-1 Settings of the DIP switch on the PMU.............................................................................................5-11

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

Product Name Product Version

BTS3900 V200R010

Intended AudienceThis document is intended for:

l System engineers

l Site maintainers

Change HistoryFor changes in the document, refer to Changes in BTS3900 Site Maintenance Guide.

Organization1 Safety Information

2 NodeB Site Maintenance Preparation

This describes how to prepare for the NodeB site maintenance. The NodeB site maintenancepreparation involves obtaining the site information, selecting the maintenance items, andpreparing the tools and spare parts.

3 BTS3900 Routine Hardware Maintenance Items

This describes how to perform the routine hardware maintenance for the BTS3900. Themaintenance items consist of the NodeB equipment room maintenance items, maintenance itemsof the NodeB power supply and grounding system, and BTS3900 cabinet maintenance items.

4 Powering On/Off the BTS3900

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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.

Conventions1. Symbol Conventions

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

Symbol Description

DANGERIndicates a hazard with a high level of risk that, if not avoided,will result in death or serious injury.

WARNINGIndicates a hazard with a medium or low level of risk which, ifnot avoided, could result in minor or moderate injury.

CAUTIONIndicates a potentially hazardous situation that, if not avoided,could cause equipment damage, data loss, and performancedegradation, or unexpected results.

TIP Indicates a tip that may help you solve a problem or save yourtime.

NOTE Provides additional information to emphasize or supplementimportant points of the main text.

2. General Conventions

Convention Description

Times New Roman Normal paragraphs are in Times New Roman.

Boldface Names of files,directories,folders,and users are in boldface. Forexample,log in as user root .

Italic Book titles are in italics.

Courier New Terminal display is in Courier New.

3. Command Conventions

About This DocumentBTS3900


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

Issue 01 (2008-04-30)


Boldface The keywords of a command line are in boldface.

Italic Command arguments are in italic.

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

{x | y | ...} Alternative items are grouped in braces and separated by verticalbars.One is selected.

[ x | y | ... ] Optional alternative items are grouped in square brackets andseparated by vertical bars.One or none is selected.

{ x | y | ... } * Alternative items are grouped in braces and separated by verticalbars.A minimum of one or a maximum of all can be selected.

[ x | y | ... ] * Alternative items are grouped in braces and separated by verticalbars.A minimum of zero or a maximum of all can be selected.

4. GUI Conventions


Boldface Buttons,menus,parameters,tabs,window,and dialog titles are inboldface. For example,click OK.

> Multi-level menus are in boldface and separated by the ">" signs.For example,choose File > Create > Folder .

5. Keyboard Operation


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

Key1+Key2 Press the keys concurrently.For example,pressing Ctrl+Alt+Ameans the three keys should be pressed concurrently.

Key1,Key2 Press the keys in turn.For example,pressing Alt,A means the twokeys should be pressed in turn.

6. Mouse Operation

Action Description

Click Select and release the primary mouse button without moving thepointer.

Double-click Press the primary mouse button twice continuously and quicklywithout moving the pointer.

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Action Description

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

About This DocumentBTS3900


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

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1 Safety Information

1.1 Safety PrecautionsThis section describes certain safety precautions and helps to choose the measurement deviceand testing device. Read and follow these safety precautions before installing, operating, andmaintaining Huawei devices.

Following All Safety Precautions

Before any operation, read the instructions and precautions in this document carefully tominimize the possibility of accidents.

The Danger, Caution, and Note items in the package of documents do not cover all the safetyprecautions that must be followed. They only provide the generic safety precautions foroperations.

Symbols

DANGERThis symbol indicates that casualty or serious accident may occur if you ignore the safetyinstruction.

CAUTIONThis symbol indicates that serious or major injury may occur if you ignore the safety instruction.

NOTE

This symbol indicates that the operation may be easier if you pay attention to the safety instruction.

BTS3900Site Maintenance Guide 1 Safety Information


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Complying with the Local Safety Regulations

When operating the device, comply with the local safety regulations. The safety precautionsprovided in the documents are supplementary. You must comply with the local safetyregulations.

General Installation Requirements

The personnel in charge of installation and maintenance must be trained and master the correctoperating methods and safety precautions before beginning work.

The rules for installing and maintaining the device are as follows:

l Only the trained and qualified personnel can install, operate and maintain the device.

l Only the qualified specialists are allowed to remove the safety facilities, and repair thedevice.

l Any replacement of the device or part of the device (including the software) or any changemade to the device must be performed by qualified or authorized personnel of Huawei.

l Any fault or error that might cause safety problems must be reported immediately to thepersonnel in charge.

Grounding Requirements

The following requirements are applicable to the device to be grounded:

l Ground the device before installation and remove the ground cable after uninstallation.

l Do not operate the device in the absence of a ground conductor. Do not damage the groundconductor.

l The unit (or system) must be permanently connected to the protection ground beforeoperation. Check the electrical connection of the device before operation and ensure thatthe device is reliably grounded.

Safety of Personnel

Ensure the following:

l When lightning strikes, do not operate the device and cables.

l When lightning strikes, unplug the AC power connector. Do not use the fixed terminal ortouch the terminal or antenna connector.

NOTE

The previous two requirements are suitable for the wireless fixed terminal.

l To prevent electric shock, do not connect safety extra-low voltage (SELV) circuits totelecommunication network voltage (TNV) circuits.

l To prevent laser radiation from injuring your eyes, never look into the optical fiber outletwith unaided eyes.

l To prevent electric shock and burns, wear the electrostatic discharge (ESD) clothing, glovesand wrist strap, and remove conductors such as jewelry and watch before operation.

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Device Safetyl Before operation, the device must be secured on the floor or other fixed objects, such as

the walls and the mounting racks.l Do not block ventilation openings while the system is running.

l When installing the panel, tighten the screw with the tool.

1.2 Electricity Safety

High Voltage

DANGERl The high voltage power supply provides power for running the system. Direct contact with

the high voltage power supply or contact through damp objects may result in fatal danger.l Non-standard and improper high voltage operations may result in fire and electric shock.

l The personnel who install the AC facility must be qualified to perform operations on highvoltage and AC power supply facilities.

l When installing the AC power supply facility, follow the local safety regulations.

l When operating the AC power supply facility, follow the local safety regulations.

l When operating the high voltage and AC power supply facilities, use the specific toolsinstead of common tools.

l When the operation is performed in a damp environment, ensure that water is kept off thedevice. If the cabinet is damp or wet, shut down the power supply immediately.

ThunderstormThe following requirements are suitable only for the wireless base station or the device with anantenna or GPS antenna.

DANGERIn a thunderstorm, do not perform operations on high voltage and AC power supply facilities oron a steel tower and mast.

High Electrical Leakage

CAUTIONGround the device before powering on the device. Otherwise, the personnel and device are indanger.



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If the "high electrical leakage" flag is stuck to the power terminal of the device, you must groundthe device before powering it on.

Power Cable

CAUTIONDo not install and remove the power cable with a live line. Transient contact between the coreof the power cable and the conductor may generate electric arc or spark, which may cause fireor eye injury.

l Before installing or removing the power cable, turn off the power switch.

l Before connecting the power cable, ensure that the power cable and label comply with therequirements of the actual installation.

Fuse

CAUTIONTo ensure that the system runs safely, when a fuse blows, replace it with a fuse of the same typeand specifications.

Electrostatic Discharge

CAUTIONThe static electricity generated by the human body may damage the electrostatic sensitivecomponents on the circuit board, such as the large-scale integrated circuit (LIC).

In the following situations, the human body generates a static electromagnetic field:

l Movement of body parts

l Clothes friction

l Friction between shoes and the ground

l Holding plastic in hand

The static electromagnetic field will remain within the human body for a long time.

Before contacting the device, plug boards, circuit boards, and application specific integratedcircuits (ASICs), wear a grounded ESD wrist strap. It can prevent the sensitive components frombeing damaged by the static electricity in the human body.

Figure 1-1shows how to wear an ESD wrist strap.




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Figure 1-1 Wearing an ESD wrist strap

1.3 Inflammable Environment

DANGERDo not place the device in the environment that has inflammable and explosive air or fog. Donot perform any operation in this environment.

Any operation of the electrical device in the inflammable environment causes danger.

1.4 Battery

Storage Battery

DANGERBefore handling the storage battery, read the safety precautions for the handling and connectionof the storage battery.

Incorrect operation of storage batteries may cause danger. During operation, ensure thefollowing:

l Prevent any short-circuit.

l Prevent the electrolyte from overflowing and leakage.

Electrolyte overflow may damage the device. It will corrode the metal parts and the circuitboards, and ultimately damage the device and cause short-circuit of the circuit boards.



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General Operations

Before installing and maintaining the storage battery, ensure the following:

l Use special insulation tools.

l Use eye protection devices and operate with care.

l Wear rubber gloves and an apron in case of an electrolyte overflow.

l Always keep the battery upright when moving. Do not place the battery upside down or tiltit.

Short-Circuit

DANGERShort-circuit of the battery may cause injury. Although the voltage of a battery is low, hightransient current generated by short-circuit will release a surge of power.

Keep metal objects away from the battery to prevent short circuit. If they have to be used,disconnect the battery in use before performing any other operation.

Harmful Gas

CAUTIONl Do not use unsealed lead-acid storage batteries, because the gas emitted from it may result

in fire or device corrosion.

l Lay the storage battery horizontally and fix it properly.

The lead-acid storage battery in use will emit flammable gas. Therefore, store it in a place withgood ventilation and take precautions against fire.

High Temperature

CAUTIONHigh temperature may result in distortion, damage, and electrolyte overflow of the battery.

When the temperature of the battery exceeds 60oC, check whether there is acid overflow. If acidoverflow occurs, handle the acid immediately.




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Acid

CAUTIONIf the acid overflows, it should be absorbed and neutralized immediately.

When handling a leaky battery, protect against the possible damage caused by the acid. Use thefollowing materials to absorb and neutralize acid spills:

l Sodium bicarbonate (baking soda): NaHCO3

l Sodium carbonate (soda): Na2CO3

Antacids must be used according to the instructions provided by the battery manufacturer.

Lithium Battery

CAUTIONThere is danger of explosion if the battery is incorrectly replaced.

l Replace the lithium battery with the same or equivalent type recommended by themanufacturer.

l Dispose of the used battery according to the instructions provided by the manufacturer.

l Do not dispose of the lithium battery in fire.

1.5 Radiation

Electromagnetic Field Exposure

CAUTIONHigh power radio-frequency signals are harmful to human body.

Before installing or maintaining an antenna on a steel tower or mast with a large number oftransmitter antennas, the operator should coordinate with all parties to ensure that the transmitterantennas are shut down.

The base transceiver station (BTS) has RF radiation (radiation hazard). Suggestions for theinstallation and operation of BTSs are given in the following section. Operators are also requiredto comply with the related local regulations on erecting BTSs.

l The antenna should be located in an area that is inaccessible to the public where the RFradiation exceeds the stipulated value.



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l If the areas where RF radiation exceeds the stipulated value are accessible to workers,ensure that workers know where these areas are. They can shut down the transmitters beforeentering these areas. Such areas may not exist; but if they exist, the areas must be within arange of less than 10 m around the antennas.

l Each forbidden zone should be indicated by a physical barrier and striking sign to warn thepublic or workers.

Laser

CAUTIONWhen handling optical fibers, do not stand close to, or look into the optical fiber outlet withunaided eyes.

Laser transceivers or transmitters are used in the optical transmission system and associated testtools. Because the laser that is transmitted through the optical fiber produces a small beam oflight, it has a very high power density and is invisible to human eyes. If a beam of light entersthe eye, the retina may be damaged.

Normally, staring into the end of an unterminated optical fiber or broken optical fiber with theunaided eyes from a distance of more than 150 mm [5.91 in.] will not cause eye injury. Eyesmay, however, be damaged if an optical tool such as a microscope, magnifying glass or eyeloupe is used to stare into the bare optical fiber end.

Read the following guidelines to prevent laser radiation:

l Only the trained and authorized personnel can perform the operation.

l Wear a pair of eye-protective glasses when you are handling lasers or optical fibers.

l Ensure that the optical source is switched off before disconnecting optical fiber connectors.

l Never look into the end of an exposed optical fiber or an open connector if you cannotensure that the optical source is switched off.

l To ensure that the optical source is switched off, use an optical power meter.

l Before opening the front door of an optical transmission system, ensure that you are notexposed to laser radiation.

l Never use an optical tool such as a microscope, a magnifying glass, or an eye loupe to lookinto the optical fiber connector or end.

Read the following instructions before handling optical fibers:

l Only the trained personnel can cut and splice optical fibers.

l Before cutting or splicing an optical fiber, ensure that the optical fiber is disconnected fromthe optical source. After disconnecting the optical fiber, use protecting caps to protect allthe optical connectors.




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1.6 Working at Heights

CAUTIONWhen working at heights, ensure that the objects do not fall.

When working at heights, ensure that the following requirements must be met:

l The personnel who work at heights must be trained.

l The operating machines and tools should be carried and handled safely to prevent themfrom falling.

l Safety measures, such as wearing a helmet and a safety belt, should be taken.

l In cold regions, warm clothes should be worn before working at heights.

l Ensure that the lifting appliances are well prepared for working at heights.

Lifting Weights

CAUTIONDo not access the areas under the arm of the crane and the goods in suspension when liftingweights.

l Ensure that the operators have been trained and qualified.

l Check the weight lifting tools and ensure that they are intact.

l Lift the weight only when the weight lifting tools are firmly mounted onto the weight-bearing object or the wall.

l Use a concise instruction to prevent incorrect operation.

l The angle between the two cables should be less than or equal to 90o in the lifting of weights(See Figure 1-2).



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Figure 1-2 Lifting a weight

Safety Guide on Ladder UseChecking the Ladder

l Check the ladder before using it. Check the maximum weight that the ladder can support.

l Never overload the ladder.

Placing the Ladder

l The slant angle is preferred to be 75o. The slant can be measured with the angle square orwith arms, as shown in Figure 1-3. When using a ladder, place the wider end of the ladderon the ground and take protective measures on the base of the ladder against slippage. Placethe ladder on a stable ground.

When climbing the ladder, ensure the following:

l The gravity of the body does not shift from the edge of the ladder.

l Keep balance on the ladder before performing any operation.

l Do not climb higher than the fourth highest step of the ladder.

If you tend to climb to the roof, the length of the ladder should be at least one meter higher thanthe eave, as shown in Figure 1-4.




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Figure 1-3 Slant angle

Figure 1-4 One meter higher than the eave

1.7 Mechanical Safety

Drilling

CAUTIONDo not drill on the cabinet without permission. Inappropriate drilling on the cabinet may damagethe electromagnetic shielding and internal cables. Metal shavings from the drilling may resultin a short-circuit of the circuit board if they get into the cabinet.

l Before drilling a hole on the cabinet, remove the cables from the cabinet.



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l During the drilling, wear blinkers to protect your eyes.

l During the drilling, wear the protective gloves.

l Prevent the metal shavings from getting into the cabinet. After drilling, clean the metalshavings in time.

Handling Sharp Objects

CAUTIONWhen carrying the device by hand, wear the protective gloves to prevent injury by sharp objects.

Handling Fansl When replacing a component, place the component, screw, and tool at a safe place to prevent

them from falling into the running fan.l When replacing the ambient equipment around the fan, do not place the finger or board

into the running fan until the fan is switched off and stops running.

Moving Heavy ObjectsWear the protective gloves when moving heavy objects.

CAUTIONl Be careful when moving heavy objects.

l When moving the chassis outwards, be aware about the unfixed or heavy objects on thechassis to prevent injury.

l Two persons should be available to move a chassis; one person must not move a heavychassis. When moving a chassis, keep your back straight and move stably to prevent asprain.

l When moving or lifting a chassis, hold the handle or bottom of the chassis. Do not hold thehandle of the installed modules in the chassis, such as the power module, fan module, orboard.

1.8 Others

Inserting and Removing a Board

CAUTIONWhen inserting a board, wear the ESD wrist strap or gloves. Insert the board gently to preventany bent pins on the backplane.




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l Insert the board along the guide rail.

l Avoid contact of one board with another to prevent short-circuit or damage.

l Do not remove the active board before powering off.

l When holding a board in hand, do not touch the board circuit, components, connectors, orconnection slots.

Bundling Signal Cables

CAUTIONBundle the signal cables separately from the strong current cables or high voltage cables.

Cabling RequirementsAt a very low temperature, movement of the cable may damage the plastic skin of the cable. Toensure the construction safety, comply with the following requirements:

l When installing cables, ensure that the environment temperature is above 0oC.

l If cables are stored in the place below 0oC, move the cables into a place at a roomtemperature and store the cables for more than 24 hours before installation.

l Move the cables with care, especially at a low temperature. Do not drop the cables directlyfrom the vehicle.



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2 NodeB Site Maintenance Preparation

This describes how to prepare for the NodeB site maintenance. The NodeB site maintenancepreparation involves obtaining the site information, selecting the maintenance items, andpreparing the tools and spare parts.

Obtaining the Site InformationBefore performing the NodeB site maintenance, you need to obtain the following information:

l Uncleared NodeB faults and alarms

l Hardware configuration

l Local environment

l Spare parts

Selecting the Maintenance ItemsBased on the NodeB site information, you can select from the following maintenance items:

l Maintaining the NodeB equipment room

l Maintaining the power supply and grounding system of the NodeB

l Maintaining the NodeB cabinet

l Maintaining the antenna system of the NodeB

Preparing the Tools and Spare PartsBased on the NodeB site information and maintenance items, you need to prepare the tools andspare parts for maintenance.

The tools commonly used for site maintenance are as follows:

l Frequency test devices such as the frequency generator and spectrum analyzer with relatedconnectors and cables

l Power test devices for measuring and analyzing the output power of the NodeB, such asthe power meter

l Antenna detecting devices for locating faults and testing the Voltage Standing Wave Ratio(VSWR), return loss, and cable insertion loss, such as the SiteMaster

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l Other devices– Multimeter

– NodeB health check tool

– LMT

– Rubidium clock for locating the NodeB clock

– Spare parts

NOTE

If the parts on site are faulty and need to be replaced, you must prepare the matched tools and newparts.

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3 BTS3900 Routine Hardware MaintenanceItems

About This Chapter

This describes how to perform the routine hardware maintenance for the BTS3900. Themaintenance items consist of the NodeB equipment room maintenance items, maintenance itemsof the NodeB power supply and grounding system, and BTS3900 cabinet maintenance items.

3.1 NodeB Equipment Room Maintenance ItemsThis describes the maintenance items, frequency, guidelines, and standards of the NodeBequipment room.

3.2 Maintenance Items of the NodeB Power Supply and Grounding SystemThis describes the maintenance items, frequency, guidelines, and standards of the NodeB powersupply and grounding system.

3.3 BTS3900 Cabinet Maintenance ItemsThis describes the maintenance items, frequency, guidelines, and standards of the BTS3900cabinet.

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3.1 NodeB Equipment Room Maintenance ItemsThis describes the maintenance items, frequency, guidelines, and standards of the NodeBequipment room.

Table 3-1 lists the equipment room maintenance items.

Table 3-1 NodeB equipment room maintenance items

Item Frequency Guideline Standard

Alarms relatedto theequipmentroom

Daily Check whether the powersupply alarm, fire alarm, orsmoke alarm is reported.

No power supply alarm, firealarm, or smoke alarm isreported.

Temperature Weekly Record the temperature inthe equipment room.

-20℃ to +50℃

Humidity Weekly Record the humidity in theequipment room.

5% RH to 85% RH

Lighting Every twomonths

Check whether the dailylighting and emergencylighting are normal.

-

Air conditioner Every twomonths

Check whether the airconditioner works properly.

-

Disasterpreventiondevices

Every twomonths

Check whether the disasterprevention devices,equipment protectiondevices, and fireextinguisher are in propercondition.

l The foam or dry powderextinguisher beforeexpiry is equipped in theequipment room and thepressure of theextinguisher meets therequirement.

l The equipment room isfree from rats, ants,moths, or other insects.

Cleanliness Every twomonths

Check whether the cabinet,equipment housing, insideof the equipment, desksurface, floor, door, andwindow are clean.

All items in the equipmentroom are clean and tidy.

3.2 Maintenance Items of the NodeB Power Supply andGrounding System

This describes the maintenance items, frequency, guidelines, and standards of the NodeB powersupply and grounding system.

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Table 3-2 lists the maintenance items of the NodeB power supply and grounding system.

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

Item Frequency Guideline Reference Standard

Power cables Monthly Check the connectionsof the power cables.

The power cables are notaging. The connectionsare safe and secure withno corrosion at the joints.

Voltage Monthly Use a multimeter tomeasure the voltage ofthe power supply.

The voltage of the powersupply stays within theallowed voltage range.

PGND cables Monthly Check whether theconnections of thePGND cables andgrounding bars in theequipment room aresafe and secure.

The PGND cables are notaging. The connections ofthe PGND cables are safeand secure with nocorrosion at the joints.Proper anti-corrosivemeasures are taken andthe grounding bars are notcorroded.

Groundingresistance

Monthly Use an earth resistancemeter to measure thegrounding resistanceand keep a record.

The grounding resistanceof the cabinet is lowerthan 10 ohms.

Batteries Yearly Check the batteries andrectifier in the powersupply system of eachequipment room.

The batteries meet thecapacity requirementsand are properlyconnected. Thespecifications of therectifier meet therequirements.

3.3 BTS3900 Cabinet Maintenance ItemsThis describes the maintenance items, frequency, guidelines, and standards of the BTS3900cabinet.

Table 3-3 lists the BTS3900 cabinet maintenance items.

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Table 3-3 BTS3900 cabinet maintenance items

Item Frequency Guideline Reference Standard

Fan Monthly Check whether the fan worksproperly.

The fan works properlywithout any abnormalsounds such as a sound ofthe blades scrapingagainst the fan box.

Air filter Quarterly Clean the air filter if the airfilter is dusty.

-

Surface of thecabinet

Quarterly Check whether the surface ofthe cabinet is impaired andwhether the label of eachequipment is legible.

-

Lock anddoor of thecabinet

Quarterly Check whether the lock anddoor work properly.

-

Cleanliness Quarterly Check whether each cabinet isclean.

The surface and inside ofthe cabinet are clean.

Fan box Yearly Clean the fan box if the surfaceand inside of the fan box aredusty.

-

LED Monthly Check whether the LEDs foreach board in the cabinet workproperly.

For details on the LEDs,refer to BTS3900Hardware Description.

ESD wriststrap

Quarterly Check the ESD wrist strap byusing one of the followingmethods:l Use an ESD wrist strap

tester.l Use a multimeter to check

the grounding resistance ofthe ESD wrist strap.

l If the ESD wrist strapworks properly, theLED on the ESD wriststrap tester indicatesGOOD.

l If the ESD wrist strapworks properly, thegrounding resistanceof the ESD wrist strapstays within the rangefrom 0.75 megohm to10 megohms.

3 BTS3900 Routine Hardware Maintenance ItemsBTS3900



Issue 01 (2008-04-30)

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.

BTS3900Site Maintenance Guide 4 Powering On/Off the BTS3900


4-1

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

WRFU in slot 0 RFU0

WRFU in slot 1 RFU1

WRFU in slot 2 RFU2

WRFU in slot 3 RFU3

4 Powering On/Off the BTS3900BTS3900



Issue 01 (2008-04-30)

Module Power Switch

WRFU in slot 4 RFU4

WRFU in slot 5 RFU5

NOTE

The WRFUs 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

PostrequisiteAfter 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.

WRFU0 to WRFU5 RUN LED is green and blinks every other second.

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



4-3

Component LED Status

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.

ContextFigure 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

BBU BBU

Standby BBU SPARE1

FAN FAN

4 Powering On/Off the BTS3900BTS3900



Issue 01 (2008-04-30)

Module Power Switch

WRFU in slot 0 RFU0

WRFU in slot 1 RFU1

WRFU in slot 2 RFU2

WRFU in slot 3 RFU3

WRFU in slot 4 RFU4

WRFU in slot 5 RFU5

NOTE

The WRFUs 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 FUN 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



4-5

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 between the BBU3900 and other NEs, namely, RNC, RRU, and WRFU.Replacing a BBU3900 case may disrupt all the services carried by the NodeB.

5.2 Replacing a Board or Module of the BBU3900This describes how to replace a board or module of the BBU3900. All transmission ports of theBBU3900 are on the boards and modules. Replacing a board or module may disrupt all theservices carried by the NodeB.

5.3 Replacing a DCDU-01This describes how to replace a DCDU-01. The DCDU-01 is positioned under the BBU andused for DC power distribution and surge protection of the cabinet. Replacing a DCDU-01disrupts the services in the cabinet where the DCDU-01 is positioned. It takes about 20 minutesto replace a DCDU-01.

5.4 Replacing a FAN ModuleThis describes how to replace a FAN module. The FAN module and the air inlets of the cabinetform a ventilation loop, which enables heat dissipation for the modules such as the BBUs andWRFUs. Replacing the FAN module disrupts the heat dissipation of the cabinet. As a result, thetemperature rises and the overtemperature alarm may be reported. The services in the NodeB,however, are not affected. It takes about 20 minutes to replace a FAN module.

5.5 Replacing a PMU/PSUThis describes how to replace a PMU/PSU. Replacing the PMU of a macro NodeB temporarilydisrupts the monitoring of the power system. Replacing the PSU affects the DC power supplyto the NodeB. It takes about three minutes to replace a PMU or PSU.

5.6 Replacing an SLPU

BTS3900Site Maintenance Guide 5 Replacing Components of the BTS3900


5-1

This describes how to replace an SLPU. The SLPU is positioned above the BBU and used forsurge protection of the NodeB.

5.7 Replacing a WRFUThis describes how to replace a WRFU. The WRFUs are positioned in the upper part of theBTS3900 cabinet and used for modulating and demodulating the baseband and RF signals,processing data, and combining and dividing data. Replacing a WRFU disrupts all the servicesin the cells carried by the WRFU. It takes about 10 minutes to replace a WRFU.

5.8 Replacing the BTS3900 Power SubrackThis describes how to replace the BTS3900 power subrack. The power subrack is positioned inthe lower part of the BTS3900 cabinet. It houses the PSUs and PMU, and has power input/outputports. It takes about 30 minutes to replace a power subrack.

5 Replacing Components of the BTS3900BTS3900



Issue 01 (2008-04-30)

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 between the BBU3900 and other NEs, namely, RNC, RRU, and WRFU.Replacing a BBU3900 case may disrupt all the services carried by the NodeB.

PrerequisiteA cross screwdriver is available.

Procedure

Step 1 On the LMT, run the ULD CFGFILE command to upload the NodeB data configuration fileto the LMT 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 Turn on the power switch of the external power supply to the BBU3900. Then, power on theBBU3900 by referring to Checking the Power-On Status of the BBU3900.

Step 9 On the LMT, run the DLD CFGFILE command to download the NodeB data configuration fileto the new BBU3900.

Step 10 On the LMT, run the LST VER command to check whether the software version and theBootROM version are correct.

Step 11 Run the RST NODEB command to restart the NodeB.

----End

Postrequisite

After 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.



5-3

5.2 Replacing a Board or Module of the BBU3900This describes how to replace a board or module of the BBU3900. All transmission ports of theBBU3900 are on the boards and modules. Replacing a board or module may disrupt all theservices carried by the NodeB.

PrerequisiteA cross screwdriver and the ESD bag are available.

Procedure

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

Step 2 Remove the faulty board or module.1. Record the connections of the cables on the faulty board or module. Then, disconnect the

cables.2. Loosen the screws on both sides of the faulty board or module.3. Turn outwards the ejector lever and then pull the faulty board or module out of the slot.4. Place the faulty board or module in an ESD bag.

Step 3 Install a new board or module.1. Insert a new board or module into the slot. Then, push the board or module until it is in

position.2. Turn inwards the ejector lever and then tighten the screws on both sides of the new board

or module.3. If necessary, connect the cables to the new board or module based on the recorded

connections.

Step 4 Check whether the board or module is operational.l When the board is operational, the RUN LED blinks at 0.5 Hz and the ALM LED is OFF.

When the module is operational, the STATE LED blinks at 0.5 Hz.l If the board works in active/standby mode, the ACT LED is ON when the board is in active

mode. The ACT LED is OFF when the board is in standby mode.

NOTE

For details of the LEDs on the boards and modules, refer to the hardware description of the BBU3900.

Step 5 Check whether alarms are reported.1. On the LMT or M2000 client, run the LST ALMAF command to view active alarms.2. If active alarms are reported, clear them according to troubleshooting suggestions. If no

active alarm is reported, go to Step 6.

Step 6 Activate the BootROM or software version of the board or module.1. Run the DSP BRDVER command to check whether the BootROM or software version is

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

activate the BootROM or software version of the board or module.




Issue 01 (2008-04-30)

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

----End

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

5.3 Replacing a DCDU-01This describes how to replace a DCDU-01. The DCDU-01 is positioned under the BBU andused for DC power distribution and surge protection of the cabinet. Replacing a DCDU-01disrupts the services in the cabinet where the DCDU-01 is positioned. It takes about 20 minutesto replace a DCDU-01.

Prerequisitel The type of faulty DCDU-01 is confirmed and the new DCDU-01 is ready.

l The new DCDU-01 is intact and its version is consistent with the version of the faultyDCDU-01.

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

CAUTIONTake proper ESD protection measures, for example, wearing an ESD wrist strap or a pair ofESD gloves, to prevent electrostatic damage to the board, module, or electronic parts.

Procedure

Step 1 Power off the BTS3900 by referring to 4.2 Powering Off the BTS3900.

Step 2 Attach labels to the cables on the power output ports on the DCDU-01 panel, and then removethe cables.

Step 3 Use a cross screwdriver to remove the protecting hood from the input power cable terminal blockon the DCDU-01, as shown in Figure 5-1.



5-5

Figure 5-1 Removing the protecting hood

(1) Protecting hood (2) Retention screw (3) External input power cables

Step 4 Remove the external input power cables from the DCDU-01.

Step 5 Remove the four screws M6 x 12 from the mounting ears on the two sides of the DCDU-01, asshown in Figure 5-2.

Figure 5-2 Removing the screws from the mounting ears

Step 6 Hold the DCDU-01 with one hand and pull it with another until the module is completelyremoved.

Step 7 Put the removed DCDU-01 into the ESD box or bag.

Step 8 Put the new DCDU-01 into the original position and then fasten the removed four M6 x 12screws.

Step 9 Insert the OT terminal of the power cable into the corresponding wiring terminal in the cableterminal block. The OT terminal of the blue -48 V power cable is installed into the NEG(-) wiringterminal and that of the black GND cable is installed into the RTN(+) wiring terminal.

Step 10 Reinstall the protecting hood and fasten the screws on the cable terminal block.

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




Issue 01 (2008-04-30)

Step 12 Reinstall the removed cables onto the power output ports on the new DCDU-01 panel accordingto the labels.

----End

PostrequisiteAfter replacing the DCDU-01, check the following items:l The cables are tightly and correctly connected.

l The related alarms on the M2000 or LMT are cleared after the DCDU-01 is powered on.

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

5.4 Replacing a FAN ModuleThis describes how to replace a FAN module. The FAN module and the air inlets of the cabinetform a ventilation loop, which enables heat dissipation for the modules such as the BBUs andWRFUs. Replacing the FAN module disrupts the heat dissipation of the cabinet. As a result, thetemperature rises and the overtemperature alarm may be reported. The services in the NodeB,however, are not affected. It takes about 20 minutes to replace a FAN module.

Prerequisitel The new FAN module is ready.

l The new FAN module is intact and its version is consistent with the version of the faultyFAN module.


Context


Procedure

Step 1 Set the DC power switch labeled FAN on the DCDU-01 to OFF. Figure 5-3 shows the positionof the FAN switch on the DCDU-01 panel.



5-7

Figure 5-3 FAN switch on the DCDU-01 panel

Step 2 Attach labels to the cables on the FAN panel, and then remove the cables.

Step 3 Loosen the captive screws on the two sides of the movable cable trough, lift the cable trough,and fasten it to the upper mounting hole next to the original one, as shown in Figure 5-4.

Figure 5-4 Lifting the movable cable trough

(1) Upper mounting hole (2) Captive screw

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




Issue 01 (2008-04-30)

Figure 5-5 Removing the FAN module

Step 5 Pull the fan subrack with one hand until 1/3 of it is out. Hold the fan subrack with another handand pull it until it is completely removed from the cabinet.

Step 6 Insert the new FAN module and then fasten the screws.

Step 7 Align the movable cable trough with the original mounting holes and fasten the captive screwson the two sides of the cable trough.

Step 8 Reinstall the cables onto the ports on the FAN panel according to the labels.

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

----End

PostrequisiteAfter replacing the FAN module, check the following items:

l The cables are tightly and correctly connected.

l The RUN LED on the panel is green and blinks every other second after the FAN moduleis powered on.

l The related alarms on the M2000 or LMT are cleared after the FAN module is powered on.

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

5.5 Replacing a PMU/PSUThis describes how to replace a PMU/PSU. Replacing the PMU of a macro NodeB temporarilydisrupts the monitoring of the power system. Replacing the PSU affects the DC power supplyto the NodeB. It takes about three minutes to replace a PMU or PSU.



5-9

Prerequisitel The position of the PMU/PSU to be replaced is confirmed.

l The version of the new PMU/PSU is consistent with that of the faulty PMU/PSU.

l The tools and materials are ready. The tools and materials are the straight screwdriver, ESDwrist strap or gloves, and key to the cabinet door.

Context

CAUTIONl Before replacing the PMU/PSU, you must calculate the load of the system. If the PSUs are

not fully backed up or the batteries cannot sustain the system, removing the PSU resets theNodeB and affects services.

l Take proper ESD protection measures, for example, wearing an ESD wrist strap or a pair ofESD gloves, to prevent electrostatic damage to the board, module, or electronic parts.

Procedure

Step 1 Attach labels to the cables on the PMU panel, and then remove the cables.

Step 2 Loosen the screws on the PMU/PSU panel, as shown in Figure 5-6.

Figure 5-6 Removing the PMU/PSU

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




Issue 01 (2008-04-30)

NOTE

Figure 5-6 takes the PMU for example. The positions of the two screws on the PSU panel are the same asthose on the PMU panel.

Step 3 Pull the handle on the PMU/PSU panel and pull the PMU/PSU along the guide rails until it isremoved, as shown in Figure 5-6.

Step 4 Put the removed PMU/PSU into the ESD box or bag.

Step 5 Take the new PMU out and set the 8-bit DIP switch at the back of the new PMU according toTable 5-1, as shown in Figure 5-7.

Table 5-1 Settings of the DIP switch on the PMU

Bit

1 2 3 4 5 6 7 8

ON ON OFF OFF OFF OFF OFF OFF

Figure 5-7 DIP switch on the PMU

(1) Back of the PMU

Step 6 Loosen the two screws on the new PMU/PSU panel, as shown in Figure 5-8.



5-11

Figure 5-8 Loosening the screws on the new PMU panel

(1) Screws on the PMU panel

Step 7 Pull the handle on the PMU/PSU panel and push the PMU/PSU module along the guide railsuntil it is in position.

Step 8 Push the handle back onto the panel and then fasten the two screws on the PMU/PSU panel.

Step 9 Reinstall the cables onto the ports on the PMU panel according to the labels.

----End

PostrequisiteAfter replacing the PMU/PSU, check the following items:l The cables are tightly and correctly connected.

l After the cabinet is powered on, the RUN LED on the PMU panel is green and blinks everyother second and the power input LED on the PSU panel is steady green.

l The related alarms on the M2000 or LMT are cleared after the PMU and PSUs are poweredon.

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

5.6 Replacing an SLPUThis describes how to replace an SLPU. The SLPU is positioned above the BBU and used forsurge protection of the NodeB.

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

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




Issue 01 (2008-04-30)


Context


It takes about 10 minutes to replace an SLPU module.

Procedure

Step 1 Attach labels to the cables on the SLPU panel, and then remove the cables.

Step 2 Remove the four screws on the mounting ears fixing the SLPU.

Step 3 Pull the SLPU with one hand until 1/3 of the SLPU is out. Hold the SLPU with another handand continue to pull it until it is completely removed from the cabinet.

Step 4 Put the removed SLPU into the ESD box or bag.

Step 5 Insert the new SLPU and then fasten the four screws removed from the mounting ears.

Step 6 Reinstall the cables onto the ports on the SLPU panel according to the labels.

----End

PostrequisiteAfter replacing the SLPU, check the following items:

l The cables are tightly and correctly connected.

l The related alarms on the M2000 or LMT are cleared after the SLPU is powered on.

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

5.7 Replacing a WRFUThis describes how to replace a WRFU. The WRFUs are positioned in the upper part of theBTS3900 cabinet and used for modulating and demodulating the baseband and RF signals,processing data, and combining and dividing data. Replacing a WRFU disrupts all the servicesin the cells carried by the WRFU. It takes about 10 minutes to replace a WRFU.

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

l The new WRFU module is intact and its version is consistent with the version of the faultyWRFU module.



5-13

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

Context

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

ESD gloves, to prevent electrostatic damage to the board, module, or electronic parts.l The WRFU is heavy and must be handled with caution.

Procedure

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

Step 2 Set the corresponding RFU switch on the DCDU-01 to OFF to power off the faulty WRFU.Figure 5-9 shows the positions of the RFU switches.

Figure 5-9 RFU switches on the DCDU-01

Step 3 Attach labels to the cables on the WRFU panel and then use a torque wrench to remove thecables.

Step 4 Use a cross screwdriver to loosen the captive screws at the four corners of the WRFU panel, asshown in Figure 5-10.




Issue 01 (2008-04-30)

Figure 5-10 Loosening the captive screws

Step 5 Insert the WRFU handle key into the corresponding hole on the WRFU panel and turn the key90°. Pull the WRFU by holding the key with one hand, and then hold the WRFU with anotherhand until the WRFU is removed, as shown in Figure 5-11.



5-15

Figure 5-11 Removing the WRFU

Step 6 Put the removed WRFU into the ESD box or bag.

Step 7 Place the new WRFU on the corresponding guide rails and push it along the rails until it is inposition.

Step 8 Fasten the captive screws at the four corners of the WRFU panel to fix the WRFU to the subrack.

Step 9 Reinstall the cables onto the ports on the WRFU panel according to the labels.

Step 10 Set the corresponding RFU switch on the DCDU-01 panel to ON to power on the new WRFU.

Step 11 Activate the WRFU BootROM or software version.1. Run the DSP BRDVER command to check whether the BootROM or software version of

the new WRFU module is correct.2. If the software version is incorrect, run the ACT SOFTWARE command to reactivate the

BootROM or software version.

Step 12 Run the UBL BRD command to unblock the WRFU module.

----End

PostrequisiteAfter replacing the WRFU, check the following items:l The cables are tightly and correctly connected.

l The RUN LED on the panel is green and blinks every other second after the WRFU ispowered on.




Issue 01 (2008-04-30)

l The related alarms on the M2000 or LMT are cleared after the WRFU is powered on.

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

5.8 Replacing the BTS3900 Power SubrackThis describes how to replace the BTS3900 power subrack. The power subrack is positioned inthe lower part of the BTS3900 cabinet. It houses the PSUs and PMU, and has power input/outputports. It takes about 30 minutes to replace a power subrack.

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


Context


Procedure

Step 1 Power off the BTS3900 by referring to 4.2 Powering Off the BTS3900.

Step 2 Attach labels to the cables on the power subrack panel and PMU panel, and then remove thecables.

Step 3 Loosen the screws on the PMU/PSU panel in the power subrack, as shown in Figure 5-12.



5-17

Figure 5-12 Removing the PMU/PSU

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

NOTE

Figure 5-12 takes the PMU for example. The positions of the two screws on the PSU panel are the sameas those on the PMU panel.

Step 4 Pull the handle on the PMU/PSU panel and pull the PMU/PSU along the guide rails until it isremoved, as shown in Figure 5-12.

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 screws M6 x 12 from the mounting ears on the two sides of the power subrack,as shown in Figure 5-13.




Issue 01 (2008-04-30)

Figure 5-13 Removing the screws from the mounting ears

Step 7 Hold the power subrack with one hand and pull it with another until the subrack is completelyremoved.

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

Step 9 Install the new power subrack and all the removed PMU and PSUs into the cabinet by referringto Installing the PMU/PSU.

Step 10 Reinstall the cables onto the cable ports on the power subrack panel and PMU panel.

Step 11 Power on the BTS3900 by referring to 4.1 Powering On the BTS3900.

----End

PostrequisiteAfter replacing the power subrack, check the following items:l The cables are tightly and correctly connected.

l The related alarms on the M2000 or LMT are cleared after the power subrack is poweredon.

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



5-19

Documents

Bts3900 Site Maintenance Guide(V200 01)