BTS3900A (Ver.C) Site Maintenance Guide (02)(PDF)-En

BTS3900A (Ver.C)

Site Maintenance Guide

Issue 02

Date 2011-05-25

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2011. 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 trademarks of Huawei Technologies Co., Ltd.All other trademarks and trade names mentioned in this document are the property of their respective holders. NoticeThe purchased products, services and features are stipulated by the contract made between Huawei and thecustomer. All or part of the products, services and features described in this document may not be within thepurchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,and recommendations in this document are provided "AS IS" without warranties, guarantees or representationsof any kind, either express or implied.

The 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 all statements, information, andrecommendations in this document do not constitute the warranty of any kind, express or implied.

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

Bantian, LonggangShenzhen 518129People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

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http://www.huawei.com

mailto:[email protected]

About This Document

PurposeThis document describes the routine maintenance items for BTS3900A (Ver.C) (referred to asthe BTS3900A in this document) hardware. The maintenance items are the cabinets, powersupply system, and grounding system. It also describes the procedures for replacing components,modules, and boards.

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

Product Name Product Version

BTS3900A(Ver.C) V100R004

BTS3900A(Ver.C) GSM V100R013

BTS3900A(Ver.C) WCDMA V200R013

BTS3900A(Ver.C) LTE V100R003

Intended AudienceThis document is intended for:

l System engineersl Site maintenance engineers

Organization1 Changes in the BTS3900A (Ver.C) Site Maintenance Guide

This chapter describes the changes in the BTS3900A (Ver.C) Site Maintenance Guide.

2 Preparations for Base Station Site Maintenance

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This section describes the preparation strategy for base station site maintenance. Thepreparations for site maintenance involve obtaining site information, selecting maintenanceitems, and arranging maintenance tools and spare parts.

3 Routine Maintenance Items for the BTS3900A Hardware

The routine maintenance items for the BTS3900A hardware are the BTS3900A cabinet, BTSpower supply, and grounding system.

4 Powering On and Power Off the BTS3900A

When maintaining the BTS3900A, you need to power on and power off the BTS3900A. Whenyou power on the BTS3900A, adhere to the related rules. When you power off the BTS3900A,choose to perform normal power-off or emergency power-off based on actual situations.

5 Replacing BTS3900A Components

Replacing BTS3900A components involves replacing the BBU3900 components, radiofrequency units (RFUs), direct current distribution unit (DCDU), embedded power subrack unit(EPU), power monitoring unit (PMU) or power supply units (PSU), storage batteries,thermoelectrical cooling unit (TEC), AC surge protector, core of the heat exchanger, and heater.

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.

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Boldface Names of files, directories, folders, and users are inboldface. For example, log in as user root.

Italic Book titles are in italics.

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.

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Format Description

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

Key 1+Key 2 Press the keys concurrently. For example, pressing Ctrl+Alt+A means the three keys should be pressed concurrently.

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

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Contents

About This Document...................................................................................................................iii

1 Changes in the BTS3900A (Ver.C) Site Maintenance Guide.............................................1-1

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

3 Routine Maintenance Items for the BTS3900A Hardware ................................................3-13.1 Power Supply and Grounding System Maintenance Items.............................................................................3-23.2 Maintenance Items for BTS3900A Hardware.................................................................................................3-2

4 Powering On and Power Off the BTS3900A.........................................................................4-14.1 Powering On a Cabinet...................................................................................................................................4-24.2 Powering Off a Cabinet.................................................................................................................................4-10

5 Replacing BTS3900A Components.........................................................................................5-15.1 Querying an Electronic Label..........................................................................................................................5-2

5.1.1 Query Electronic Label of the Board.....................................................................................................5-25.1.2 Querying Electronic Cabinet Labels......................................................................................................5-2

5.2 Replacing BBU3900 Parts..............................................................................................................................5-35.2.1 Replacing the BBU3900.........................................................................................................................5-45.2.2 Replacing the GTMU.............................................................................................................................5-65.2.3 Replacing the WMPT.............................................................................................................................5-95.2.4 Replacing the LMPT............................................................................................................................5-115.2.5 Replacing the UPEU............................................................................................................................5-135.2.6 Replacing the UEIU.............................................................................................................................5-155.2.7 Replacing the FAN Unit.......................................................................................................................5-175.2.8 Replacing the UTRP.............................................................................................................................5-195.2.9 Replacing the USCU............................................................................................................................5-215.2.10 Replacing the UBRI...........................................................................................................................5-235.2.11 Replacing the WBBP.........................................................................................................................5-265.2.12 Replacing the LBBP...........................................................................................................................5-285.2.13 Replacing the Optical Module............................................................................................................5-30

5.3 Replacing SLPU Components.......................................................................................................................5-325.3.1 Replacing the SLPU Case....................................................................................................................5-325.3.2 Replacing the UELP.............................................................................................................................5-355.3.3 Replacing the UFLP.............................................................................................................................5-37

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5.4 Replacing RFC Components.........................................................................................................................5-395.4.1 Replacing the Fan Box.........................................................................................................................5-395.4.2 Replacing an RFU................................................................................................................................5-425.4.3 Replacing the DCDU-11A...................................................................................................................5-465.4.4 Replacing an ELU................................................................................................................................5-50

5.5 Replacing APM30H Components.................................................................................................................5-525.5.1 Replacing the EPU...............................................................................................................................5-535.5.2 Replacing a PMU.................................................................................................................................5-565.5.3 Replacing a PSU...................................................................................................................................5-595.5.4 Replacing the AC Surge Protector.......................................................................................................5-615.5.5 Replacing the Fuse...............................................................................................................................5-635.5.6 Replacing the Fan Box.........................................................................................................................5-665.5.7 Replacing the Fan in the Front Door....................................................................................................5-695.5.8 Replacing the AC HAU........................................................................................................................5-745.5.9 Replacing an ELU................................................................................................................................5-76

5.6 Replacing IBBS200T Components...............................................................................................................5-795.6.1 Replacing the Batteries.........................................................................................................................5-795.6.2 Replacing a TEC Unit..........................................................................................................................5-835.6.3 Replacing the CMUE...........................................................................................................................5-855.6.4 Replacing the ELU...............................................................................................................................5-88

5.7 Replacing IBBS200D Components...............................................................................................................5-915.7.1 Replacing the Batteries.........................................................................................................................5-915.7.2 Replacing a Fan in the Front Door.......................................................................................................5-955.7.3 Replacing the CMUE...........................................................................................................................5-985.7.4 Replacing the ELU.............................................................................................................................5-101

5.8 Replacing TMC11H Components...............................................................................................................5-1045.8.1 Replacing the DCDU-11C.................................................................................................................5-1055.8.2 Replacing the Fan Box.......................................................................................................................5-1085.8.3 Replacing the Fan in the Front Door..................................................................................................5-1115.8.4 Replacing the AC HAU......................................................................................................................5-1165.8.5 Replacing an ELU..............................................................................................................................5-118

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Figures

Figure 4-1 Power switches and fuses for the APM30H.......................................................................................4-3Figure 4-2 Power switches for the RFC...............................................................................................................4-4Figure 4-3 Power switches for the TMC11H.......................................................................................................4-5Figure 4-4 Power switches for the IBBS200D or IBBS200T..............................................................................4-7Figure 5-1 A label containing the bar code..........................................................................................................5-2Figure 5-2 Removing the BBU............................................................................................................................ 5-5Figure 5-3 Connecting the GTMU.......................................................................................................................5-5Figure 5-4 Position of the GTMU........................................................................................................................5-7Figure 5-5 Disconnecting the cable......................................................................................................................5-7Figure 5-6 Removing the GTMU.........................................................................................................................5-8Figure 5-7 Connecting the GTMU.......................................................................................................................5-8Figure 5-8 Position of the WMPT in the BBU.....................................................................................................5-9Figure 5-9 Disconnecting the cable....................................................................................................................5-10Figure 5-10 Removing the WMPT.....................................................................................................................5-10Figure 5-11 Position of the LMPT.....................................................................................................................5-11Figure 5-12 Disconnecting the cable..................................................................................................................5-12Figure 5-13 Removing the LMPT......................................................................................................................5-12Figure 5-14 Position of the UPEU.....................................................................................................................5-14Figure 5-15 Disconnecting the cable..................................................................................................................5-14Figure 5-16 Removing the UPEU......................................................................................................................5-15Figure 5-17 Position of the UEIU......................................................................................................................5-16Figure 5-18 Disconnecting the cable..................................................................................................................5-16Figure 5-19 Removing the UEIU.......................................................................................................................5-17Figure 5-20 Position of the FAN unit.................................................................................................................5-18Figure 5-21 Removing the FAN unit.................................................................................................................5-18Figure 5-22 Position of the UTRP......................................................................................................................5-20Figure 5-23 Disconnecting the cable..................................................................................................................5-20Figure 5-24 Removing the UTRP......................................................................................................................5-21Figure 5-25 Position of the USCU.....................................................................................................................5-22Figure 5-26 Disconnecting the cable..................................................................................................................5-22Figure 5-27 Removing the USCU......................................................................................................................5-23Figure 5-28 Position of the UBRI in the BBU...................................................................................................5-24Figure 5-29 Disconnecting the cable..................................................................................................................5-25

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Figure 5-30 Removing the UBRI.......................................................................................................................5-25Figure 5-31 Position of the WBBP.....................................................................................................................5-26Figure 5-32 Disconnecting the cable..................................................................................................................5-27Figure 5-33 Removing the WBBP.....................................................................................................................5-27Figure 5-34 Position of the LBBP......................................................................................................................5-28Figure 5-35 Disconnecting the cable..................................................................................................................5-29Figure 5-36 Removing the LBBP.......................................................................................................................5-29Figure 5-37 Position of the optical module........................................................................................................5-30Figure 5-38 Disconnecting the cable..................................................................................................................5-31Figure 5-39 Removing the optical module.........................................................................................................5-31Figure 5-40 Position of the SLPU case..............................................................................................................5-33Figure 5-41 Removing the SLPU case...............................................................................................................5-34Figure 5-42 Installing cable holders...................................................................................................................5-34Figure 5-43 Installing the SLPU case.................................................................................................................5-35Figure 5-44 Position of the UELP......................................................................................................................5-36Figure 5-45 Disconnecting the cable..................................................................................................................5-36Figure 5-46 Removing the UELP.......................................................................................................................5-37Figure 5-47 Position of the UFLP......................................................................................................................5-38Figure 5-48 Disconnecting the cable..................................................................................................................5-38Figure 5-49 Removing the UFLP.......................................................................................................................5-38Figure 5-50 Position of the fan box....................................................................................................................5-40Figure 5-51 Removing the fan box.....................................................................................................................5-41Figure 5-52 RFU positions.................................................................................................................................5-43Figure 5-53 Removing the RFU.........................................................................................................................5-45Figure 5-54 DCDU-11A position.......................................................................................................................5-47Figure 5-55 Removing the protective cover for the DC input terminal block...................................................5-48Figure 5-56 Removing the DCDU-11A.............................................................................................................5-49Figure 5-57 Position of the ELU........................................................................................................................5-50Figure 5-58 Removing the ELU housing...........................................................................................................5-51Figure 5-59 Removing the ELU.........................................................................................................................5-51Figure 5-60 Position of the EPU........................................................................................................................5-53Figure 5-61 Removing the EPU.........................................................................................................................5-55Figure 5-62 Position of the PMU.......................................................................................................................5-57Figure 5-63 Removing the PMU........................................................................................................................5-57Figure 5-64 The position of the DIP switch.......................................................................................................5-58Figure 5-65 Installing the PMU..........................................................................................................................5-58Figure 5-66 Positions of PSUs...........................................................................................................................5-59Figure 5-67 Removing the PSU.........................................................................................................................5-60Figure 5-68 Installing the PSU...........................................................................................................................5-61Figure 5-69 Installation position of the AC surge protector..............................................................................5-62Figure 5-70 Removing the surge protector.........................................................................................................5-63Figure 5-71 Installation position of the fuse and spare fuse box........................................................................5-64

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Figure 5-72 Taking the extraction tool...............................................................................................................5-65Figure 5-73 Removing the faulty fuse................................................................................................................5-65Figure 5-74 Taking the spare fuse......................................................................................................................5-66Figure 5-75 Position of the fan box....................................................................................................................5-67Figure 5-76 Plan view of the fan box.................................................................................................................5-68Figure 5-77 Removing the fan box.....................................................................................................................5-68Figure 5-78 Position of the fan in the front door................................................................................................5-70Figure 5-79 Removing the fan cable..................................................................................................................5-71Figure 5-80 Removing the air duct.....................................................................................................................5-71Figure 5-81 Removing the heat exchanger.........................................................................................................5-72Figure 5-82 Removing the cover plate for the fan cavity...................................................................................5-72Figure 5-83 Removing the fan............................................................................................................................5-73Figure 5-84 Position of the HAU in the APM30H cabinet................................................................................5-75Figure 5-85 Removing the HAU........................................................................................................................5-76Figure 5-86 Installing the HAU..........................................................................................................................5-76Figure 5-87 Position of the ELU........................................................................................................................5-77Figure 5-88 Removing the ELU housing...........................................................................................................5-78Figure 5-89 Removing the ELU.........................................................................................................................5-78Figure 5-90 Power switches of the storage batteries..........................................................................................5-80Figure 5-91 Removing the power cable for the storage batteries.......................................................................5-81Figure 5-92 Moving the baffle plate...................................................................................................................5-81Figure 5-93 Removing the storage batteries.......................................................................................................5-82Figure 5-94 Positions of a TEC unit...................................................................................................................5-83Figure 5-95 Removing the TEC protective cover..............................................................................................5-84Figure 5-96 Removing the TEC.........................................................................................................................5-85Figure 5-97 Position of the CMUE....................................................................................................................5-86Figure 5-98 Removing the CMUE installation module.....................................................................................5-87Figure 5-99 Positions of the jumper pins...........................................................................................................5-87Figure 5-100 Position of the label on the CMUE...............................................................................................5-88Figure 5-101 Position of the ELU......................................................................................................................5-89Figure 5-102 Removing the upper-left storage battery......................................................................................5-90Figure 5-103 Removing the ELU housing.........................................................................................................5-90Figure 5-104 Removing the ELU.......................................................................................................................5-90Figure 5-105 Power switches of the storage batteries........................................................................................5-93Figure 5-106 Removing the power cable for the storage batteries.....................................................................5-94Figure 5-107 Moving the baffle plate.................................................................................................................5-94Figure 5-108 Removing the storage batteries.....................................................................................................5-95Figure 5-109 Positions of the fans in the front door of the IBBS200D cabinet.................................................5-96Figure 5-110 Removing the fan installation module..........................................................................................5-97Figure 5-111 Removing the fan..........................................................................................................................5-97Figure 5-112 Position of the CMUE..................................................................................................................5-99Figure 5-113 Removing the fan installation module........................................................................................5-100

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Figure 5-114 Positions of the jumper pins.......................................................................................................5-100Figure 5-115 Position of the label on the CMUE.............................................................................................5-101Figure 5-116 Position of the ELU....................................................................................................................5-102Figure 5-117 Removing the upper-left storage battery....................................................................................5-103Figure 5-118 Removing the ELU housing.......................................................................................................5-103Figure 5-119 Removing the ELU.....................................................................................................................5-103Figure 5-120 Position of the DCDU-11C.........................................................................................................5-105Figure 5-121 Removing the protective cover for the DC input terminal block...............................................5-106Figure 5-122 Removing the DCDU-11C.........................................................................................................5-107Figure 5-123 Position of the fan box................................................................................................................5-108Figure 5-124 Plan view of the fan box.............................................................................................................5-109Figure 5-125 Removing the fan box.................................................................................................................5-110Figure 5-126 Position of the fan in the front door............................................................................................5-111Figure 5-127 Removing the fan cable..............................................................................................................5-112Figure 5-128 Removing the air duct.................................................................................................................5-112Figure 5-129 Removing the heat exchanger.....................................................................................................5-113Figure 5-130 Removing the cover plate for the fan cavity...............................................................................5-114Figure 5-131 Removing the fan........................................................................................................................5-115Figure 5-132 Position of the HAU in the TMC11H cabinet............................................................................5-117Figure 5-133 Removing the HAU....................................................................................................................5-118Figure 5-134 Installing the HAU......................................................................................................................5-118Figure 5-135 Position of the ELU....................................................................................................................5-119Figure 5-136 Removing the ELU housing.......................................................................................................5-120Figure 5-137 Removing the ELU.....................................................................................................................5-120

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Tables

Table 3-1 Routine maintenance items for the power supply and grounding system............................................3-2Table 3-2 Maintenance items for BTS3900A hardware.......................................................................................3-3Table 4-1 Power switches for the BTS3900A cabinet.........................................................................................4-2Table 4-2 Power switches and fuses for the APM30H.........................................................................................4-3Table 4-3 Power switches for the RFC.................................................................................................................4-5Table 4-4 Power switches for the TMC11H.........................................................................................................4-6Table 4-5 Power switches for the IBBS200D or IBBS200T................................................................................4-7Table 4-6 Status of the indicators on the components powered by the EPU........................................................4-8Table 4-7 Indication of normal power supply to the boards in the BBU.............................................................4-8Table 4-8 Status of the indicators on the components powered by the DCDU-11A in the RFC.........................4-8Table 4-9 Status of the indicators on the components powered by the DCDU-11C in the TMC11H.................4-9Table 4-10 Troubleshooting.................................................................................................................................4-9Table 5-1 DCDU-11A checklist.........................................................................................................................5-49

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1 Changes in the BTS3900A (Ver.C) SiteMaintenance Guide

This chapter describes the changes in the BTS3900A (Ver.C) Site Maintenance Guide.

02 (2011-05-25)This is the second commercial release.

Compared with issue 01 (2011-04-30), this issue is added with the following topic:l 5.4.4 Replacing an ELU

Compared with issue 01 (2011-04-30), this issue incorporates the following changes:

Topic Change Description

5.2.3 Replacing the WMPT The operations for loading and activating theWMPT software are modified.

5.5.1 Replacing the EPU The description about removing the short-circuiting bar is added.

Compared with issue 01 (2011-04-30), no information is deleted.

01 (2011-04-30)This is the first commercial release.

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2 Preparations for Base Station SiteMaintenance

This section describes the preparation strategy for base station site maintenance. Thepreparations for site maintenance involve obtaining site information, selecting maintenanceitems, and arranging maintenance tools and spare parts.

Collecting Site Information

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

l Faults and alarms that are not cleared

l Hardware configurations

l Local environment

l Spare parts

Selecting Maintenance Items

Select suitable maintenance items based on actual requirements of the base station. Themaintenance items are as follows:

l Equipment room environment of the base station

l Power supply and grounding system of the base station

l Main components in the base station

l Antenna system of the base station

Preparing Maintenance Tools and Spare Parts

Prepare the related maintenance tools and spare parts based on the site information andmaintenance items of the base station.

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

l Frequency test devices, such as a frequency generator and a spectrum analyzer.

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

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l Antenna and feeder test devices that are used to test the Voltage Standing Wave Ratio(VSWR), return loss, and cable insertion loss for fault location. The commonly usedantenna and feeder test device is the SiteMaster.

l Other devices– Multimeter– Diagnosis tools and robustness test devices– Local Maintenance Terminal (LMT)– Rubidium clock (used to locate the clock of the base station)

NOTE

Addition tools and new parts may be required when more faulty parts are found during themaintenance.

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3 Routine Maintenance Items for theBTS3900A Hardware

About This Chapter

The routine maintenance items for the BTS3900A hardware are the BTS3900A cabinet, BTSpower supply, and grounding system.

3.1 Power Supply and Grounding System Maintenance ItemsThis section provides the maintenance items, maintenance intervals, operation instructions, andreference standards for the power supply and grounding system of the base station.

3.2 Maintenance Items for BTS3900A HardwareThis section describes the items, checking frequencies, operations, and reference standards forthe maintenance of BTS3900A hardware.

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3.1 Power Supply and Grounding System MaintenanceItems

This section provides the maintenance items, maintenance intervals, operation instructions, andreference standards for the power supply and grounding system of the base station.

Table 3-1 lists the routine maintenance items for the power supply and grounding system.

Table 3-1 Routine maintenance items for the power supply and grounding system

Item Interval OperationInstruction

Reference Standard

Power cables Monthly Check the connectionsof power cablescarefully.

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

Voltage Monthly Measure the voltage ofthe power supply usinga multimeter.

The voltage is withinnormal range.

PGND cables Monthly Check whether thePGND cable andground bar areconnected properly.

The connections of thePGND cable are secure.The cable is not aging.The connection points aresound with no corrosionon them.

Checking Earthresistance

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

The grounding resistanceof the cabinet is smallerthan 10 ohms.

Batteries Annually Check the batteries andrectifiers.

The battery capacity iswithin normal range andthe batteries are correctlyconnected. Theperformance parametersof rectifiers are normal.

3.2 Maintenance Items for BTS3900A HardwareThis section describes the items, checking frequencies, operations, and reference standards forthe maintenance of BTS3900A hardware.

Table 3-2 describes the maintenance items for BTS3900A hardware.

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Table 3-2 Maintenance items for BTS3900A hardware

Item CheckingFrequency

Operation Guide ReferenceStandard

Fans Monthly or quarterly Check whether fanswork properly.

The fans workproperly without anyabnormal smell orsound.

Cabinet surface Every half a year Check whether thecabinet surface isdamaged andwhether the label onthe cabinet is legible.

-

Door and lock of thecabinet

Monthly Check whether thelock of the cabinetworks properly andwhether the door canbe opened and closedwithout obstructions.

-

Cabinet cleanness Every half a year Check whether thecabinet is clean.

The cabinet surfaceis clean, and theinside of the cabinetis not dusty.

Indicators on eachboard

Monthly or quarterly Check whether theindicators on themodules and boardsinside the cabinetwork properly.

For details about thestatus of theindicators, see theBTS3900A (Ver.C)HardwareDescription.

Cables Quarterly Check whether thesignal cables andtransmission cablesinside the cabinet areproperly connected.

The connectors ofeach cable are intactand properly linkedwithout corrosion orrust. The connectorsare waterproofedwithoutcondensation. Theambient temperatureshould not be higherthan 65°C (149°F).The power cables arenot deteriorating andtheir sheaths areintact.

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Item CheckingFrequency

Operation Guide ReferenceStandard

Smoke sensorNOTE

The smoke sensor isoptional. If it is notconfigured, skip thechecking.

Every three years Clean the smokesensor, check itsresponse valve, andtest its function.

The operatingenvironment is asfollows:l Temperature: –

10°C to +55°C (–50°F to +131°F)

l Humidity: ≤95% RH (+38°Cto +42°C[+100.4°F to+107.6°F],withoutcondensation)

l Wind speed: lessthan 5 m/s (16.4ft./s)

l No dust or fog inthe air

l No organicsubstances suchas alcohol, ether,or ketone in theair

l No corrosive gasin the air

l No smoke stain ingeneralconditions

ESD wrist strap Quarterly Check the ESD wriststrap in either of thefollowing ways:l Use an ESD wrist

strap tester to testthe ESD wriststrap.

l Use a multimeterto test the earthresistance of theESD wrist strap.

If you use an ESDwrist strap tester, theGOOD indicator ison.If you use amultimeter, the earthresistance rangesfrom 0.75 MΩ to 10MΩ.

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4 Powering On and Power Off the BTS3900A

About This Chapter

When maintaining the BTS3900A, you need to power on and power off the BTS3900A. Whenyou power on the BTS3900A, adhere to the related rules. When you power off the BTS3900A,choose to perform normal power-off or emergency power-off based on actual situations.

4.1 Powering On a CabinetThis describes how to power on the BTS3900A cabinet and handle the power supply failure tothe components in the cabinet.

4.2 Powering Off a CabinetThe BTS3900A can be powered off in two ways: normal power-off and emergency power-off.

BTS3900A (Ver.C)Site Maintenance Guide 4 Powering On and Power Off the BTS3900A


4-1

4.1 Powering On a CabinetThis describes how to power on the BTS3900A cabinet and handle the power supply failure tothe components in the cabinet.

Prerequisitel If the BTS3900A uses external power supply, check that the external AC input power cables

are properly installed before power-on.l The power supply to the BTS3900A meets the requirements of the power system.l Set all the circuit breakers on the DCDU-11A in the radio frequency cabinet (RFC) to OFF.l Set all the circuit breakers on the DCDU-11C in the TMC11H to OFF.l Set all the circuit breakers on the power distribution box (PDB) in the IBBS200T or

IBBS200D to OFF.l Set all the circuit breakers on the embedded power subrack unit (EPU) and baseband unit

(BBU) to OFF.l The external power supply to the BTS3900A is cut off.l The boards, modules, and cables are installed in the cabinet.

Context

CAUTIONAfter the cabinet is unpacked, it must be powered on within 7 hours. If you power off the cabinetfor maintenance, you must restore power to the cabinet within 48 hours.

NOTE

l Following is the power-on check for an AC cabinet. The power-on check for a DC cabinet is similar.

l If a high-current device is configured, replace the fuse-type circuit breaker as required.

Table 4-1 shows the power switches for the BTS3900A cabinet.

Table 4-1 Power switches for the BTS3900A cabinet

Cabinet Power Switch Description

APM30H Circuit breakers andfuses on the EPU

For details, see Figure 4-1 and Table4-2.

RFC Circuit breakers onthe DCDU-11A


TMC11H Circuit breakers onthe DCDU-11C


IBBS200D or IBBS200T Circuit breakers onthe PDB


4 Powering On and Power Off the BTS3900ABTS3900A (Ver.C)



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Figure 4-1 Power switches and fuses for the APM30H

Table 4-2 Power switches and fuses for the APM30H

Switch or Fuse Power Supply

EPU03A-02: "PSU1"to "PSU3"EPU03A-04: "PSU"

Power supply to PSUs

EPU03A-02: "ACOUTPUT"EPU03A-04: "ACOUTPUT 1"

Power supply to the following devices:l AC heater assembly unit (HAU) in the APM30H (optional)l AC HAU in the TMC11H (optional)l Heating film in the IBBS200D

EPU03A-02: "ACOUTPUT"EPU03A-04: "ACOUTPUT 2"

Power supply to the service outlet unit (SOU) in the APM30H

"BAT" Power supply to the IBBS200D or IBBS200T

"TMC" Power supply to the TMC11H

"BBU_0" Power supply to the BBU



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Switch or Fuse Power Supply

"BBU_1"

"RFC1" Power supply to the RFC

"RFC2"

"FUSE 0" "LOAD 0": power supply to customer equipment

"FUSE 1" "LOAD 1": power supply to customer equipment

"FUSE 2" "LOAD 2": power supply to customer equipment or thethermoelectrical cooling unit (TEC) in the IBBS200T

"FUSE 3" "LOAD 3": power supply to the TEC in the IBBS200T or the fansin the IBBS200D

"FUSE 4" "LOAD 4": power supply to customer equipment or the EMUA(optional)

"FUSE 5" "LOAD 5": power supply to the fan box in the APM30H

Figure 4-2 Power switches for the RFC




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Table 4-3 Power switches for the RFC

Switch Power Supply

"SW0" "LOAD0": power supply to the "RFU0"






"SW6" "LOAD6": power supply to the fan box in the RFC

"SW7" "LOAD7": Reserved for external equipment



Figure 4-3 Power switches for the TMC11H



4-5

Table 4-4 Power switches for the TMC11H

Switch Power Supply

Used as a transmissionequipment cabinet

Used as a DC power cabinet

"SW0" "LOAD0": power supply totransmission equipment

"LOAD0": power supply to customerequipment












"LOAD6": power supply to theEMUA


"LOAD7": power supply to the BBU


"LOAD8": power supply to the BBU

"SW9" "LOAD9": power supply to thefan box in the TMC11H

"LOAD9": power supply to the fanbox in the TMC11H




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Figure 4-4 Power switches for the IBBS200D or IBBS200T

Table 4-5 Power switches for the IBBS200D or IBBS200T

Switch Power Supply

"BAT_SW0" Power supply to the upper storage batteries

"BAT_SW1" Power supply to the lower storage batteries

"FAN/TEC_SW2" Power supply to the fans on the front door of the IBBS200D or to theTEC in the IBBS200T

ProcedureStep 1 Check the resistance between the external power supply and the earth by using a multimeter.

Ensure that no short circuit exists.

Step 2 If the IBBS200D or IBBS200T is configured for a base station, set the circuit breaker labeledBAT on the EPU and all circuit breakers on the IBBS200D or IBBS200T to ON.

Step 3 Turn on the external power switch to power on the cabinet.

Step 4 Set all the power switches on the EPU to ON. Then, check power supply to each component inthe cabinet against Table 4-6.

DANGERExecute caution when performing a power-on check, which involves some high voltageoperations. Direct or indirect contact with the input voltage using a damp object may be fatal.



4-7

Table 4-6 Status of the indicators on the components powered by the EPU

Cabinet Component

Status

APM30H PMU For details, see PMU.

PSU For details, see PSU (AC/DC).

Fans The fans work properly. The RUN indicator blinks green rapidly(on for 0.125s and off for 0.125s) or slowly (on for 1s and off for1s).

IBBS200D orIBBS200T

Fans The fans work properly. The RUN indicator blinks green rapidly(on for 0.125s and off for 0.125s) or slowly (on for 1s and off for1s).

Step 5 Set all the power switches on the BBU to ON, and then check power supply to the boards in theBBU against Table 4-7.

Table 4-7 Indication of normal power supply to the boards in the BBU

Board Status

GTMU The RUN indicator blinks green rapidly (on for 0.125s and off for 0.125s) orslowly (on for 1s and off for 1s).

WMPT The RUN indicator blinks green rapidly (on for 0.125s and off for 0.125s) orslowly (on for 1s and off for 1s).

LMPT The RUN indicator blinks green rapidly (on for 0.125s and off for 0.125s) orslowly (on for 1s and off for 1s).

WBBP The RUN indicator blinks green rapidly (on for 0.125s and off for 0.125s) orslowly (on for 1s and off for 1s).

LBBP The RUN indicator blinks green rapidly (on for 0.125s and off for 0.125s) orslowly (on for 1s and off for 1s).

FAN The STATE indicator blinks green slowly (on for 1s and off for 1s).

UPEU The RUN indicator is steady green.

Step 6 Set the DC output power switch on the DCDU-11A in the RFC to ON. Then, check power supplyto each component in the cabinet against Table 4-8.

Table 4-8 Status of the indicators on the components powered by the DCDU-11A in the RFC

Component

Status

RFU The RUN indicator blinks green rapidly (on for 0.125s and off for 0.125s) orslowly (on for 1s and off for 1s).




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Component

Status

Fans The fans work properly. The RUN indicator blinks green rapidly (on for 0.125sand off for 0.125s) or slowly (on for 1s and off for 1s).

Step 7 Set the corresponding DC output power switch on the DCDU-11C in the TMC11H to ON. Then,check power supply to each component in the cabinet against Table 4-9.

Table 4-9 Status of the indicators on the components powered by the DCDU-11C in theTMC11H

Component

Status

Fans The fans work properly. The RUN indicator blinks green rapidly (on for 0.125sand off for 0.125s) or slowly (on for 1s and off for 1s).

Transmissionequipment

For details, see the documents associated with transmission equipment.

Step 8 If power supply to the components fails after the cabinet is powered on, handle the fault byreferring to Table 4-10.

Table 4-10 Troubleshooting

Fault Measure

Failure of power supplyto all the internalcomponents of thecabinet

Check whether the PGND cable and input power cable areproperly connected.l If cable connections are incorrect, set all the power switches to

OFF, and then reconnect the power cables.l If cable connections are correct, replace the EPU, DCDU-11A,

or DCDU-11C.

Failure of power supplyto a board in the cabinet

Do as follows:1. Remove the board, and then check that the pins of the slot on

the backplane are not distorted, broken, or missing. Replacethe subrack if necessary.

2. Insert the board into the subrack, and then check the indicatorstatus on the board.

3. If the indicator indicates an exception, remove the board, insertit into another similar vacant slot, and then check the indicatorstatus on the board.l If the board works properly, the original slot is faulty. In

this case, replace the subrack.l If the fault persists, the board is faulty. In this case, replace

the board.



4-9

Fault Measure

Failure of power supplyto any other type ofcomponent in thecabinet

Use a multimeter to measure the input voltage of the component.l If the input power is normal (ranging from -57 V DC to -43.2

V DC), replace the component.l If the input power is abnormal, check whether the power cables

for the component are securely connected. If cable connectionsare not secure, set all power switches on the EPU, DCDU-11A,or DCDU-11C to OFF, and then reconnect the power cables.If cable connections are secure, the power switches or fuses onthe module may be damaged. In this case, replace the moduleor fuses.

----End

4.2 Powering Off a CabinetThe BTS3900A can be powered off in two ways: normal power-off and emergency power-off.

ContextYou must perform the normal power off for the BTS3900A in normal situations such as plannedequipment move and anticipating a territorial blackout.

You must perform the emergency power off for the BTS3900A in an emergency such as a fire,smoke, or water immersion.

Procedurel Normal power-off

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

NOTE

Although the RFU can be blocked either remotely or locally, you are advised to block the RFUremotely.

If the RF module works in dual mode, you need to block the RFU in both modes.

Note that you cannot block an RF module working in GSM mode but can only block the carriersof the RF module.

2. Set all the circuit breakers on the DCDU-11A in the radio frequency cabinet (RFC)to OFF.

3. Set all the circuit breakers on the DCDU-11C in the transmission cabinet (TMC) toOFF.

4. Set all the circuit breakers on the power distribution box (PDB) in the IBBS200T orIBBS200D to OFF.

5. Set all the circuit breakers on the embedded power subrack unit (EPU) to OFF.6. Turn off the external power switch of the BTS3900A.

l Emergency power-off1. Turn off the external power switch of the BTS3900A.




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2. Set all the DC power switches of the BTS3900A to OFF if time permits.

CAUTIONPowering off the BTS3900A in an emergency may damage the equipment and boards. Incases other than emergencies, perform normal power-off.

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5 Replacing BTS3900A Components

About This Chapter

Replacing BTS3900A components involves replacing the BBU3900 components, radiofrequency units (RFUs), direct current distribution unit (DCDU), embedded power subrack unit(EPU), power monitoring unit (PMU) or power supply units (PSU), storage batteries,thermoelectrical cooling unit (TEC), AC surge protector, core of the heat exchanger, and heater.

5.1 Querying an Electronic LabelBefore replacing a board or component, you must query the electronic label to confirm the typeof the faulty board or the type of the cabinet that houses the faulty component.

5.2 Replacing BBU3900 PartsDuring the BBU3900 maintenance, the following parts of the BBU3900 can be replaced asrequired: the BBU3900 case, BBU3900 boards and module, and optical modules.

5.3 Replacing SLPU ComponentsDuring the SLPU maintenance, the SLPU components, such as the SLPU case, UELP, andUFLP, can be replaced as required

5.4 Replacing RFC ComponentsIf you power off a radio frequency cabinet (RFC) component for maintenance, you must restorepower to the component within 48 hours.

5.5 Replacing APM30H ComponentsIf you power off an APM30H component for maintenance, you must restore power to it within48 hours.

5.6 Replacing IBBS200T ComponentsIf you power off the base station during the maintenance of an IBBS200T component, you mustrestore power to the base station within 48 hours.

5.7 Replacing IBBS200D ComponentsIf you power off the base station during the maintenance of an IBBS200D component, you mustrestore power to the base station within 48 hours.

5.8 Replacing TMC11H ComponentsIf you power off the base station during the maintenance of a TMC11H component, you mustrestore power to the base station within 48 hours.

BTS3900A (Ver.C)Site Maintenance Guide 5 Replacing BTS3900A Components


5-1

5.1 Querying an Electronic LabelBefore replacing a board or component, you must query the electronic label to confirm the typeof the faulty board or the type of the cabinet that houses the faulty component.

5.1.1 Query Electronic Label of the BoardBefore replacing a board, you need to query the electronic label of the board at the remote endto confirm the type of board to be replaced.

5.1.2 Querying Electronic Cabinet LabelsYou must query the electronic cabinet label before replacing a component in a cabinet todetermine the cabinet type.

5.1.1 Query Electronic Label of the BoardBefore replacing a board, you need to query the electronic label of the board at the remote endto confirm the type of board to be replaced.

1. Run the DSP BTSELABEL command on the LMT to query the information of the boardthat is configured on the GSM side or run the LST BRDINFO command on the LMT toquery the information of the board that is configured on the UMTS side or run the DSPBRDMFRINFO command on the LMT to query the information of the board that isconfigured on the LTE side.

2. Confirm the type of board to be replaced according to the Boardtype and Descriptionfields in the queried result. Ensure that the new board is of the same type by checking theinformation indicated by the bar code on the label of the panel or handle of the new board.Figure 5-1 shows a label containing the bar code.

Figure 5-1 A label containing the bar code

5.1.2 Querying Electronic Cabinet LabelsYou must query the electronic cabinet label before replacing a component in a cabinet todetermine the cabinet type.

1. If the base station works in GSM standard, run the DSP BTSELABEL on the LMT toquery the cabinet type. If the base station works in UMTS or LTE standard, run the DSPELABEL command on the LMT to query the cabinet type.

2. View the information displayed under Description in the command execution result toknow the cabinet type.

5 Replacing BTS3900A ComponentsBTS3900A (Ver.C)



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3. Prepare new components based on the cabinet type.

5.2 Replacing BBU3900 PartsDuring the BBU3900 maintenance, the following parts of the BBU3900 can be replaced asrequired: the BBU3900 case, BBU3900 boards and module, and optical modules.

NOTEIf two main control boards need to be replaced in a dual-mode base station, you must replace one maincontrol board and wait for the board to resume services before replacing the other main control board.

5.2.1 Replacing the BBU3900The BBU3900 is the core of the base station. The BBU3900 processes the baseband signals ofthe entire base station system and communicates with the RNC/BSC and MRFU/RRU.Replacing a BBU3900 disrupts all the services carried by the base station.

5.2.2 Replacing the GTMUThe GSM Transmission & Management Unit for BBU (GTMU) is the basic transmission andcontrol function entity of the BBU. It provides the reference clock, power supply port, andexternal alarm collection port, and controls and manages the entire base station.

5.2.3 Replacing the WMPTThe WCDMA Main Processing & Transmission unit (WMPT) processes signals and managesresources on other boards.

5.2.4 Replacing the LMPTThe LTE Main Processing & Transmission unit (LMPT) manages the entire eNodeB system interms of OM and signaling processing and provides the clock for the BBU3900.

5.2.5 Replacing the UPEUThe Universal Power and Environment Interface Unit (UPEU) is configured in the BBU and itconverts –48 V DC or +24 V DC power into +12 V DC.

5.2.6 Replacing the UEIUThe Universal Environment Interface Unit (UEIU) provides channels for transmitting themonitoring signals from the service board to the BBU.

5.2.7 Replacing the FAN UnitThe FAN unit is located in the BBU. The FAN unit and the air inlet box form a ventilation loop,which ensures ventilation and heat dissipation. Replacing the FAN unit may lead toovertemperature alarms due to interruption of heat dissipation in the BBU. The services,however, are not affected.

5.2.8 Replacing the UTRPThe Universal Transmission Processing unit (UTRP) in the BBU3900 provides ports fortransmission.

5.2.9 Replacing the USCUThe Universal Satellite card and Clock Unit (USCU) in the BBU receives clock signals, such asGPS, RGPS, BITS, and M-1PPS signals. In addition, it transmits or receives 1PPS+TOD clocksignals.

5.2.10 Replacing the UBRIReplacing the Universal BaseBand Radio Interface Board (UBRI) disrupts all the servicescarried on the board.

5.2.11 Replacing the WBBP



5-3

The WCDMA Baseband Process Unit (WBBP) is configured in the BBU and it processesbaseband signals.

5.2.12 Replacing the LBBPThe LTE BaseBand Processing unit (LBBP) in the BBU3900 processes the baseband signalsand CPRI signals.

5.2.13 Replacing the Optical ModuleThe optical module implements optical-electrical conversion, thus enabling optical transmissionbetween the BBU and other devices.

5.2.1 Replacing the BBU3900The BBU3900 is the core of the base station. The BBU3900 processes the baseband signals ofthe entire base station system and communicates with the RNC/BSC and MRFU/RRU.Replacing a BBU3900 disrupts all the services carried by the base station.

Prerequisitel The tools and materials are ready, such as the ESD wrist strap or ESD gloves and M6

screwdriver.

l The type of BBU case to be replaced and its quantity are confirmed, and the new BBU caseis ready.

l If a static IP-based GSM base station is used, the Ethernet cable and PC installed with theSMT application are available. For details about the hardware requirements of the PC, seethe GSM SMT User Guide.

l The associated personnel have been permitted to access the site and obtained the requiredkeys.

Procedure

Step 1 Instruct the M2000 administrator to perform the following operations for the replacement of theBBU:

1. On the NodeB, run the BLK LOCELL command to block all the cells of the NodeB.Modify the ESN on the RNC by referring to the new BBU. For details, see the RANMaintenance Guide.

2. On the eNodeB, run the BLK CELL command to block all the cells of the eNodeB. Modifythe ESN in the DHCP management system by referring to the new BBU. For details, seethe RAN Maintenance Guide.

3. On the BSC, run the LST GCELL command to query the configuration of all cells of thebase station, and then run the SET GCELLADMSTAT command to block these cells.Modify the ESN on the BSC by referring to the new BBU. For details, see the RANMaintenance Guide.

NOTEIn a multi-mode base station, the cells of each mode should be blocked separately.

Step 2 Power off the BBU. For details, see Powering Off the BBU.

Step 3 Wear an ESD wrist strap or ESD gloves.




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WARNINGTake proper ESD protection measures, for example, wear an ESD wrist strap or ESD gloves, toprevent electrostatic damage to the boards, modules, or electronic components.

Step 4 Record all the cable connections on the panels of the boards in the BBU to be replaced.

Step 5 Disconnect the power cables, transmission cables, CPRI cables, and alarm cables from the panelsof the boards in the BBU.

Step 6 Loosen the four M6 screws on the BBU, and then remove the BBU, as shown in Figure 5-2.

Figure 5-2 Removing the BBU

Step 7 Remove all the boards in the faulty BBU case, install them in the corresponding slots of the newBBU case, and then install filler panels in the idle slots.

Step 8 Install the new BBU, tighten the screws on the BBU until the tightening torque reaches 2 N·m,and then reconnect the cables.

Step 9 Power on the BBU. For details, see Powering On the BBU.

Step 10 Check the status of the LEDs on the boards to determine whether the new BBU case worksproperly. For details about the status of the LEDs, see the related hardware description.

Step 11 If a static IP-based GSM base station is used, perform the following operations:1. Connect the PC installed with the SMT application to the ETH port on the GTMU, as shown

in Figure 5-3.

Figure 5-3 Connecting the GTMU

2. Log in to the SMT, and then configure the static IP data. For details, see the GSM SMTUser Guide.

3. Disconnect the PC installed with the SMT application from the GTMU.

Step 12 Perform following operations on the LMT of the NodeB and eNodeB.1. Ensure that no alarms related to the boards and modules in the BBU are generated. For

details, see the LMT User Guide.



5-5

Step 13 Perform following operations on the M2000:1. On the NodeB, run the UBL LOCELL command to unblock all cells working in UMTS

mode.2. On the eNodeB, run the UBL CELL command to unblock all cells working in LTE mode.3. On the BSC, run the SET GCELLADMSTAT command to unblock all cells working in

GSM mode.4. Synchronize the inventory information manually. For details, see the M2000 Software and

Hardware Management User Guide.

Step 14 Take off the ESD wrist strap or gloves, and then pack up all the tools.

----End

Follow-up Procedurel Place the replaced component into the ESD box or bag. Then, place the ESD box or bag

into a carton padded with foam or into the packing box of the new component.l Fill in the fault form to record detailed information of the replaced components.l Contact the local Huawei office to handle the faulty component.

5.2.2 Replacing the GTMUThe GSM Transmission & Management Unit for BBU (GTMU) is the basic transmission andcontrol function entity of the BBU. It provides the reference clock, power supply port, andexternal alarm collection port, and controls and manages the entire base station.

Prerequisitel After confirming the type of faulty board, do as follows:

– If the board can be queried online, run the associated command on the LMT to 5.1.1Query Electronic Label of the Board.

– If the board is faulty and cannot be queried online, query the board information offlineon the M2000. For detailed operations, see the section about how to query inventorydata in the M2000 documentation disk.

l The tools and materials are ready, such as the ESD wrist strap or ESD gloves and M3screwdriver.

l If a static IP-based base station is used, the Ethernet cable and the PC installed with theSMT application are available. For details about the hardware requirements of the PC, seethe GSM SMT User Guide.


Contextl Figure 5-4 shows the position of the GTMU in the BBU.




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Figure 5-4 Position of the GTMU

GTMU

GTMU

ETH FE0 FE1

CPRI0 CPRI2 CPRI4

CPRI3CPRI1 CPRI5TX RX

TX0 RX0 TX1 RX1 TX2 RX2 TX3 RX3 TX4 RX4 TX5 RX5 LIU0LIU2

LIU1LIU3

USB TST E1/T1 RST

RUNALMACT

1 2 3 4 5

l The board is hot-swappable.l If a multi-mode base station supports co-transmission and the shared ports for co-

transmission are on the GTMU, replacing the GTMU disrupts the services of the othermode. Typical scenario: The GU multi-mode base station supports co-transmission overTDM through the E1/T1 ports on the GTMU board. The UMTS data is transmitted throughthe backplane in the manner of TDM over Packet (TOP).

Procedure

Step 1 Instruct the M2000 administrator to perform the following preparations for the replacement ofthe GTMU:1. On the BSC, run the SET GCELLADMSTAT command to block all the cells of the base

station.2. If a static IP-based base station is used, run the LST BTSIPRT command to query the IP

address and route information on the BSC. Otherwise, go to Step 2.


CAUTIONTake proper ESD protection measures, for example, wear an ESD wrist strap or ESD gloves, toprevent electrostatic damage to the boards, modules, or electronic components.

Step 3 Record all the cable connections on the panel of the module to the replaced.

Step 4 Disconnect the transmission cable and CPRI cable from the GTMU. If a surge protection boardis configured, the surge protection transfer cable also needs to be disconnected, as shown inFigure 5-5.

Figure 5-5 Disconnecting the cable

Step 5 Remove the two M3 screws on the panel, and then pull out the GTMU, as shown in Figure5-6.



5-7

Figure 5-6 Removing the GTMU

12

Step 6 Set the DIP switches on the new board according to the settings of the DIP switches on the faultyboard. If required, query the information about the DIP switch by referring to GTMU.

Step 7 Install the new board, tighten the screws on the board until the tightening torque reaches 0.6N·m, and then reconnect the cables.

Step 8 Check the status of the LEDs to determine whether the new board works properly. For detailsabout the status of the LEDs, see GTMU.

Step 9 If a static IP-based base station is used, perform the following operations:1. Connect the PC installed with the SMT application to the ETH port on the GTMU, as shown

in Figure 5-7.

Figure 5-7 Connecting the GTMU

2. Log in to the SMT, and then configure the static IP data. For details, see the GSM SMT

User Guide.3. Disconnect the PC installed with the SMT application from the GTMU.

Step 10 Perform following operations on the LMT:1. Query the software version of the board. For details, see the BSC6900 GSM LMT User

Guide. If the software version is the target version, go to step c. If not, go to Step 10.2.2. On the LMT, run the LST BTSAUTODLDACTINFO command to check whether the

automatic load and activation of the BTS software is enabled on the BSC. If not, load andactivate the GTMU software and TRXs of the corresponding base station. If yes, go to stepc.

3. Check whether alarms are reported by referring to Browsing Alarms. If an alarm is reported,clear the alarm by referring to Querying Alarm Handling Suggestions.

Step 11 Perform following operations on the M2000:1. Run the SET GCELLADMSTAT command to unblock all the cells of the base station.2. Synchronize the inventory information manually. For details, see the M2000 Software and





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----End


into a carton padded with foam or into the packing box of the new component.

l Fill in the fault form to record detailed information of the replaced components.

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

5.2.3 Replacing the WMPTThe WCDMA Main Processing & Transmission unit (WMPT) processes signals and managesresources on other boards.






Context

l Figure 5-8 shows the position of the WMPT in the BBU.

Figure 5-8 Position of the WMPT in the BBU

WMPT

WMPT

ETH FE0 FE1 USB TST E1/T1 RST GPS

RUNALMACT

TX RX

l The WMPT is hot-swappable.

l If a multi-mode base station supports co-transmission and the shared ports for co-transmission are on the WMPT, replacing the WMPT disrupts the services of the othermode. For example, a GU multi-mode base station supports IP co-transmission through theEthernet link on the WMPT. The IP co-transmission can be implemented based on theinterconnection between the FE ports on the WMPT and GTMU panels.



5-9

Procedure

Step 1 Instruct the M2000 administrator to perform the following operations before replacing theWMPT:1. Upload the configuration files of the base station on the FTP server of the M2000. For

details, see the Base Station Commissioning Guide.2. On the NodeB, run the BLK LOCELL command to block all the cells of the NodeB.



Step 3 Record all the cable connections on the panel of the module to be replaced.

Step 4 Disconnect the transmission cable from the WMPT. If a surge protection board is configured,the surge protection transfer cable also needs to be disconnected, as shown in Figure 5-9.


Step 5 Remove the two M3 screws on the panel, and then pull out the WMPT, as shown in Figure5-10.

Figure 5-10 Removing the WMPT

2

1

Step 6 Set the DIP switches on the new board according to the settings of the DIP switches on the faultyboard. For details, see WMPT.


Step 8 Check the status of the LEDs to determine whether the new board works properly. For detailsabout the status of the LEDs, see WMPT.




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Step 9 Perform following operations on the LMT:1. Upgrade the NodeB software and data configuration file. For details, see section Upgrading

the NodeB Software.2. Check whether alarms are reported by referring to Browsing Alarms. If an alarm is reported,

clear the alarm by referring to Querying Alarm Handling Suggestions.

Step 10 Perform following operations on the M2000:1. On the NodeB, run the UBL LOCELL command to unblock all the cells of the NodeB.2. Synchronize the inventory information manually. For details, see the M2000 Software and

Hardware Management User Guide.3. Set the status from TESTING to NORMAL manually. For details, see the M2000

Topology Management User Guide.


----End


into a carton padded with foam or into the packing box of the new component.l Fill in the fault form with the detail information of the replaced component.l Contact the local Huawei office to handle the faulty component.

5.2.4 Replacing the LMPTThe LTE Main Processing & Transmission unit (LMPT) manages the entire eNodeB system interms of OM and signaling processing and provides the clock for the BBU3900.






Contextl Figure 5-11 shows the position of the LMPT in the BBU.

Figure 5-11 Position of the LMPT

TX

SFP 0

RX TX

SFP 1

RX

USB TST ETH FE/GE0 FE/GE1GPSRST

RUNALMACT

LMPT

LMPT



5-11

l The board is hot-swappable.

Procedure

Step 1 Instruct the M2000 administrator to perform the following operations before replacing theLMPT:

1. Back up NE configuration data. For details, see the M2000 Data Management UserGuide.

2. On the eNodeB, run the ULD LICENSE command to back up the license file.

3. On the eNodeB, run the BLK CELL command to block all the cells of the eNodeB.




Step 4 Disconnect the cables from the LMPT, as shown in Figure 5-12.


Step 5 Remove the two M3 screws on the panel, and then pull out the LMPT, as shown in Figure5-13.

Figure 5-13 Removing the LMPT

2

1





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Step 7 Check the status of the LEDs to determine whether the new board works properly. For detailsabout the status of the LEDs, see LMPT.

Step 8 Perform following operations on the LMT:

1. The eNodeB self-test function helps set up an OM link between the eNodeB and the M2000and manually download configuration files and software. For details, see the ManagingeNodeB Software and Data Configuration File.


Step 9 Perform following operations on the M2000:

1. On the eNodeB, run the INS LICENSE command to load the license file.

2. On the eNodeB, run the UBL CELL command to unblock all the cells of the eNodeB.

3. Synchronize the inventory information manually. For details, see the M2000 Software andHardware Management User Guide.


----End





5.2.5 Replacing the UPEUThe Universal Power and Environment Interface Unit (UPEU) is configured in the BBU and itconverts –48 V DC or +24 V DC power into +12 V DC.






Contextl Figure 5-14 shows the position of the UPEU in the BBU.



5-13

Figure 5-14 Position of the UPEU

UPEU

l Replacing the UPEU disrupts the power supply to the BBU, and accordingly disrupts

services carried by the BBU. Therefore, the UPEU should be replaced within 10 minutes.

ProcedureStep 1 Instruct the M2000 administrator to perform the following operations before replacing the

UPEU:1. On the NodeB, run the BLK LOCELL command to block all the cells working in UMTS

mode.2. On the eNodeB, run the BLK CELL command to block all the cells working in LTE mode.3. On the BSC, run the LST GCELL command to query the configuration of all the cells of

the base station working in GSM mode, and then run the SET GCELLADMSTATcommand to block these cells.


CAUTIONReplacing the UPEU disrupts all the services carried by the base station if no standby UPEU isconfigured.

Step 2 Power off the BBU. For details, see Powering Off the BBU3900.




Step 5 Disconnect the power cable, monitoring cable, and alarm cable from the UPEU, as shown inFigure 5-15.





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Step 6 Remove the two M3 screws on the panel, and then pull out the UPEU, as shown in Figure5-16.

Figure 5-16 Removing the UPEU

12


Step 8 Power on the BBU. For details, see Powering on the BBU3900.

Step 9 Check the status of the LEDs to determine whether the new board works properly. For detailsabout the status of the LEDs, see UPEU.

Step 10 Perform following operations on the LMT:1. Check whether alarms are reported by referring to Browsing Alarms. If an alarm is reported,


Step 11 Inform the M2000 administrator that the replacement is complete, and then instruct theadministrator to perform the following operations:1. On the eNodeB, run the UBL CELL command to unblock all cells working in LTE mode.2. On the NodeB, run the UBL LOCELL command to unblock all cells working in UMTS

mode.3. On the BSC, run the SET GCELLADMSTAT command to unblock all cells working in




----End


into a carton padded with foam or into the packing box of the new component.l Fill in the fault form with the detail information of the replaced component.l Contact the local Huawei office to handle the faulty component.

5.2.6 Replacing the UEIUThe Universal Environment Interface Unit (UEIU) provides channels for transmitting themonitoring signals from the service board to the BBU.



5-15






Contextl Figure 5-17 shows the position of the UEIU in the BBU.

Figure 5-17 Position of the UEIU

UEIU


l Replacing the UEIU may cause the failure to monitor the external equipment. Therefore,the UEIU must be replaced within five minutes.

Procedure




Step 3 Disconnect the monitoring cable and alarm cable from the UEIU, as shown in Figure 5-18.





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Step 4 Remove the two M3 screws on the panel, and then pull out the UEIU, as shown in Figure5-19.

Figure 5-19 Removing the UEIU

21







----End





5.2.7 Replacing the FAN UnitThe FAN unit is located in the BBU. The FAN unit and the air inlet box form a ventilation loop,which ensures ventilation and heat dissipation. Replacing the FAN unit may lead toovertemperature alarms due to interruption of heat dissipation in the BBU. The services,however, are not affected.





5-17




Contextl Figure 5-20 shows the position of the FAN unit in the BBU.

Figure 5-20 Position of the FAN unit

FAN

l The unit is hot-swappable.l Replacing the FAN unit may lead to overtemperature alarms due to interruption of heat

dissipation in the BBU. Therefore, the FAN unit should be replaced within three minutes.

Procedure



Step 2 Remove the two M3 screws on the panel, and then pull out the FAN unit, as shown in Figure5-21.

Figure 5-21 Removing the FAN unit

1 2




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CAUTIONWhen removing the FAN unit, do not touch the rotating fans to avoid injury of your hands.

Step 3 Install the new unit, tighten the screws on the unit until the tightening torque reaches 0.6 N·m.

Step 4 Check the status of the LEDs to determine whether the new module works properly. For detailsabout the status of the LEDs, see FAN.






----End





5.2.8 Replacing the UTRPThe Universal Transmission Processing unit (UTRP) in the BBU3900 provides ports fortransmission.






Contextl Figure 5-22 shows the recommended position of the UTRP in the BBU.



5-19

Figure 5-22 Position of the UTRP

RUNALMACT

E1/T1(0-3)

UTRP

E1/T1(4-7)

UTRP

l The board is hot-swappable.l The UTRP supports co-transmission of a multi-mode base station, and the shared ports for

co-transmission are on the UTRP. Therefore, replacing the UTRP disrupts the services ofthe other mode.

Procedure

Step 1 Instruct the M2000 administrator to perform the following preparations for the replacement ofthe UTRP:1. On the eNodeB, run the BLK CELL command to block all the cells working in LTE mode.2. On the NodeB, run the BLK LOCELL command to block all the cells working in UMTS

mode.3. On the BSC, run the SET GCELLADMSTAT command to block all cells working in

GSM mode.




Step 4 Disconnect the transmission cable from the UTRP. If a surge protection board is configured, thesurge protection transfer cable also needs to be disconnected, as shown in Figure 5-23.


Step 5 Loosen the two M3 screws on the panel, and then remove the UTRP, as shown in Figure5-24.




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Figure 5-24 Removing the UTRP

Step 6 Set the DIP switches on the new board according to the settings of the DIP switches on the faultyboard. If required, query the information about the DIP switch by referring to UTRP.


Step 8 Check the status of the LEDs to determine whether the new board works properly. For detailsabout the status of the LEDs, see UTRP.



Step 10 Perform following operations on the M2000:1. On the eNodeB, run the UBL CELL command to unblock all cells working in LTE mode.2. On the NodeB, run the UBL LOCELL command to unblock all cells working in UMTS





----End





5.2.9 Replacing the USCUThe Universal Satellite card and Clock Unit (USCU) in the BBU receives clock signals, such asGPS, RGPS, BITS, and M-1PPS signals. In addition, it transmits or receives 1PPS+TOD clocksignals.



5-21




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


Contextl Figure 5-25 shows the position of the USCU in the BBU.

Figure 5-25 Position of the USCU

USCUUSCUALMALMRUNRUN

ACTACT

TOD1TOD1

GPSRX+ RX- TX+ TX-

BITSGR

EEN IN

YELLO

W O

UT

RGPS

M-1PPS

TOD0

GPSRX+ RX- TX+ TX-

BITSGR

EEN IN

YELLO

W O

UT

RGPS

M-1PPS

TOD0

1S+ 1S- GND PWR1S+ 1S- GND PWR

USCU


Procedure




Step 3 Remove the GPS clock signal cable on the USCU, as shown in Figure 5-26.





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Step 4 Remove the two M3 screws on the panel, and then pull out the USCU, as shown in Figure5-27.

Figure 5-27 Removing the USCU.

2

1


Step 6 Check the status of the LEDs to determine whether the new board works properly. For detailsabout the status of the LEDs, see USCU.






----End





5.2.10 Replacing the UBRIReplacing the Universal BaseBand Radio Interface Board (UBRI) disrupts all the servicescarried on the board.





5-23




Contextl Figure 5-28 shows the position of the UBRI in the BBU.

Figure 5-28 Position of the UBRI in the BBU

UBRI

CPRI 0 CPRI 1 CPRI 2 CPRI 3 CPRI 4 CPRI 5

TX RX TX RX TX RX TX RX TX RX TX RXRUNALMACT

UBRI

The UBRI is hot-swappable.

Procedure

Step 1 Instruct the M2000 administrator to perform the following operations before replacing the UBRI:

1. On the eNodeB, run the BLK CELL command to block all the cells working in LTE mode.

2. On the NodeB, run the BLK LOCELL command to block all the cells working in UMTSmode.

3. On the BSC, run the LST GCELL command to query the configuration of all the cells ofthe base station working in GSM mode, and then run the SET GCELLADMSTATcommand to block these cells.





Step 4 Disconnect the CPRI cable from the board, as shown in Figure 5-29.




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Step 5 Remove the two M3 screws on the panel, and then pull out the UBRI, as shown in Figure5-30.

Figure 5-30 Removing the UBRI

2

1


Step 7 Check the status of the LEDs to determine whether the new board works properly. For detailsabout the status of the LEDs, see UBRI.



Step 9 Perform following operations on the M2000:1. On the eNodeB, run the UBL CELL command to unblock all cells working in LTE mode.2. On the NodeB, run the UBL LOCELL command to unblock all cells working in UMTS





----End


into a carton padded with foam or into the packing box of the new component.l Fill in the fault form with the detail information of the replaced component.



5-25


5.2.11 Replacing the WBBPThe WCDMA Baseband Process Unit (WBBP) is configured in the BBU and it processesbaseband signals.






Contextl Figure 5-31 shows the position of the WBBP in the BBU.

Figure 5-31 Position of the WBBP

WBBP

WBBP TX RX

CPRI0/EIH0 CPRI1/EIH1 CPRI2/EIH2

TX RX TX RXRUNALMACT

l The WBBP is hot-swappable.

Procedure

Step 1 Instruct the M2000 administrator to perform the following operations before replacing theWBBP:1. On the NodeB, run the BLK BRD command to block the WBBP.



Step 3 Record all the cable connections on the panel of the module to be replaced.




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Step 4 Disconnect the CPRI cable from the WBBP, as shown in Figure 5-32.


Step 5 Remove the two M3 screws on the panel, and then pull out the WBBP, as shown in Figure5-33.

Figure 5-33 Removing the WBBP

2

1


Step 7 Check the status of the LEDs to determine whether the new board works properly. For detailsabout the status of the LEDs, see WBBP.



Step 9 Inform the M2000 administrator that the replacement is complete, and then instruct theadministrator to perform the following operations:1. On the NodeB, run the UBL BRD command to unblock the WBBP.2. Synchronize the inventory information manually. For details, see the M2000 Software and



----End





5-27

5.2.12 Replacing the LBBPThe LTE BaseBand Processing unit (LBBP) in the BBU3900 processes the baseband signalsand CPRI signals.






Contextl Figure 5-34 shows the position of the LBBP in the BBU.

Figure 5-34 Position of the LBBP

CPRI 0 CPRI 1 CPRI 2 CPRI 3 CPRI 4 CPRI 5

TX RX TX RX TX RX TX RX TX RX TX RXLBBP RUNALMACT

LBBP


Procedure

Step 1 Instruct the M2000 administrator to perform the following operations before replacing theLBBP:1. On the eNodeB, run the BLK BRD command to block the LBBP.



Step 3 Record all the CPRI cable connections on the panel of the board to be replaced.

Step 4 Disconnect the CPRI cable from the LBBP, as shown in Figure 5-35.




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Step 5 Remove the two M3 screws on the panel, and then pull out the LBBP, as shown in Figure5-36.

Figure 5-36 Removing the LBBP

2

1


Step 7 Check the status of the LEDs to determine whether the new board works properly. For detailsabout the status of the LEDs, see LBBP.




1. On the eNodeB, run the UBL BRD command to unblock the LBBP.



----End







5-29

5.2.13 Replacing the Optical ModuleThe optical module implements optical-electrical conversion, thus enabling optical transmissionbetween the BBU and other devices.

Prerequisitel The tools and materials are ready. They are the ESD wrist strap or ESD gloves.l All the types of optical module are ready.l The associated personnel have been permitted to access the site and obtained the required

keys.

Contextl Figure 5-37 shows the position of the optical module on a board.

Figure 5-37 Position of the optical module

1

(1) Optical module

l Optical modules are hot-swappable.l Replacing the optical module disrupts the CPRI transmission.

Procedure

Step 1 Wear an ESD wrist strap or a pair of ESD gloves.

CAUTIONTake proper ESD protection measures, for example, wear an ESD wrist strap or ESD gloves, toprevent electrostatic damage to the boards, modules, or other electronic components.

Step 2 Prepare the optical module of the same type as the faulty optical module according to the labelon the module.

NOTEThe optical module to be replaced or to be installed must have a matching rate with the correspondingCPRI port.

Step 3 Record the position of the faulty optical module on the board.




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Step 4 Press the latch on the optical cable connector, and then remove the connector from the faultyoptical module, as shown in Figure 5-38.


WARNINGDo not look into the optical module without eye protection after the optical cable is removedfrom the optical module.

Step 5 Turn the puller on the faulty optical module outwards, hold the puller and take the faulty opticalmodule out of the slot, and then remove the optical module from the BBU, as shown in Figure5-39.

Figure 5-39 Removing the optical module



5-31

Step 6 Install the new optical module onto the BBU.

Step 7 Remove the dustproof caps from the new optical module and optical connector, and then insertthe optical cable connector into the new optical module.

Step 8 Check whether the transmission is proper according to the status of the LEDs on the board. Fordetails about the status of the LEDs on the board, see the related hardware description.


----End

Follow-up Procedurel Put the replaced components into an ESD box or bag. Then, put the ESD box or bag into

a carton padded with foam or into the packing boxes of the new components.


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

5.3 Replacing SLPU ComponentsDuring the SLPU maintenance, the SLPU components, such as the SLPU case, UELP, andUFLP, can be replaced as required

5.3.1 Replacing the SLPU CaseIf the signal lightning protection unit (SLPU) case is faulty and cannot be repaired promptly,you must replace it.

5.3.2 Replacing the UELPEach Universal E1/T1 Lightning Protection unit (UELP) provides protection for four E1s/T1s.

5.3.3 Replacing the UFLPEach Universal FE Lightning Protection unit (UFLP) provides protection for two FEs/GEs.

5.3.1 Replacing the SLPU CaseIf the signal lightning protection unit (SLPU) case is faulty and cannot be repaired promptly,you must replace it.

Prerequisitel Tools and materials, such as an electrostatic discharge (ESD) wrist strap or ESD gloves,

flat-head screwdrivers, Phillips screwdrivers, and an ESD box or bag, are ready.

l The model of the component to be replaced is confirmed by referring to 5.1.2 QueryingElectronic Cabinet Labels, and a new component of the same model is ready.

l Associated personnel have obtained keys and site access permission.

l The new component is intact, and its hardware version is the same as that of the componentto be replaced.




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Contextl Figure 5-40 shows the position of the SLPU case in a cabinet.

l It takes about 10 minutes to replace the SLPU case.

Figure 5-40 Position of the SLPU case

(1) SLPU case

Procedure

Step 1 Instruct the M2000 administrator to back up or transfer the services carried on the boards in theSLPU case to other modules before the replacement.

Step 2 Wear the ESD wrist strap or ESD gloves.

CAUTIONTake proper ESD protection measures; for example, wear an ESD wrist strap or ESD gloves, toprevent electrostatic damage to the boards, modules, or electronic components.

Step 3 Remove the faulty SLPU case.

1. Label the cables connected to the SLPU case before removing them.

2. Remove all the boards from the SLPU case. For details, see 5.3.2 Replacing the UELPand 5.3.3 Replacing the UFLP.

3. Insert the removed boards into the new SLPU case, and then install filler panels in vacantslots.



5-33

4. Use a Phillips screwdriver to remove the two captive screws from both sides of the faultySLPU case, and then pull the case out of the cabinet along the guide rails gently, as shownin Figure 5-41.

Figure 5-41 Removing the SLPU case

Step 4 Place the replaced SLPU case and protective covers into an ESD box or bag.

Step 5 Install the new SLPU case.1. Install cable holders on both sides of the new SLPU case, and move the mounting ear on

each side one hole backwards along the side, as shown in Figure 5-42.

Figure 5-42 Installing cable holders




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2. Slide the new SLPU case along the guide rails into the slot until it snaps shut, as shown inFigure 5-43.

3. Use a Phillips screwdriver to tighten the two captive screws on both sides of the SLPUcase, as shown in Figure 5-43.

Figure 5-43 Installing the SLPU case

4. Reconnect the cables to the ports on the panel of the new case according to the labels onthe cables.

Step 6 Inform the M2000 administrator that the replacement is complete, and instruct the administratorto perform the following operations:

1. Verify that no alarms related to the new case are generated. For details, see the related LMTuser guide.

2. Synchronize the inventory information manually. For details, see the M2000 OperatorGuide.

Step 7 Take off the ESD wrist strap or ESD gloves, and pack up all the tools.

----End

Follow-up Procedurel Place the removed component into the ESD box or bag. Then, place the ESD box or bag


l Fill in the fault form with detailed information about the removed component.


5.3.2 Replacing the UELPEach Universal E1/T1 Lightning Protection unit (UELP) provides protection for four E1s/T1s.





5-35



l Associated personnel have been permitted to access the site and obtained required keys.

Contextl Figure 5-44 shows the position of the UELP in the SLPU.

Figure 5-44 Position of the UELP

SLPUUELP

S0INSIDE OUTSIDE

S1

S2

S3

UELP


Procedure




Step 3 Disconnect the transmission cables from the UELP, as shown in Figure 5-45.


Step 4 Remove the two M3 screws on the panel, and then pull out the UELP, as shown in Figure5-46.




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Figure 5-46 Removing the UELP

1

21

Step 5 Set the DIP switches on the new board according to the settings of the DIP switches on the faultyboard. If required, query the information about the DIP switch by referring to UELP.




Step 8 Perform following operations on the M2000:1. Synchronize the inventory information manually. For details, see the M2000 Software and



----End



5.3.3 Replacing the UFLPEach Universal FE Lightning Protection unit (UFLP) provides protection for two FEs/GEs.





l Associated personnel have been permitted to access the site and obtained required keys.



5-37

Contextl Figure 5-47 shows the position of the UFLP in the SLPU.

Figure 5-47 Position of the UFLPSLPU

S0

S1

S2

S3

FE0

INSIDE OUTSIDE

FE1 FE0 FE1UFLP

UFLP


Procedure




Step 3 Disconnect the transmission cables from the UFLP, as shown in Figure 5-48.


Step 4 Remove the two M3 screws on the panel, and then pull out the UFLP, as shown in Figure5-49.

Figure 5-49 Removing the UFLP

1

21




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Step 7 Perform following operations on the M2000:1. Synchronize the inventory information manually. For details, see the M2000 Software and



----End



5.4 Replacing RFC ComponentsIf you power off a radio frequency cabinet (RFC) component for maintenance, you must restorepower to the component within 48 hours.

5.4.1 Replacing the Fan BoxIf the fan box in the radio frequency cabinet (RFC) is faulty, you must replace it.

5.4.2 Replacing an RFUReplacing an radio frequency unit (RFU) interrupts the services carried on the RFU.

5.4.3 Replacing the DCDU-11AIf the DCDU-11A is faulty and cannot be repaired promptly, you must replace it.

5.4.4 Replacing an ELUIf the electronic label unit (ELU) is faulty, you must replace it.

5.4.1 Replacing the Fan BoxIf the fan box in the radio frequency cabinet (RFC) is faulty, you must replace it.


flat-head screwdrivers, Phillips screwdrivers, and an ESD box or bag, are ready.l The model of the component to be replaced is confirmed by referring to 5.1.2 Querying

Electronic Cabinet Labels, and a new component of the same model is ready.l Associated personnel have obtained keys and site access permission.l The new component is intact, and its hardware version is the same as that of the component

to be replaced.



5-39

Contextl Figure 5-50 shows the position of the fan box in the RFC.

l The fan box in the RFC houses the CMUE and fans. If any of the components is faulty, thefan box must be replaced.

l It takes about 20 minutes to replace the fan box.

Figure 5-50 Position of the fan box

(1) Fan box in the RFC (2) Power switch for the fan box in the RFC

Procedure



Step 2 Set the circuit breaker labeled SW6 on the DCDU-11A to OFF.

Step 3 Remove the faulty fan.

1. Record the connections of the cables on the panel of the fan box, and then disconnect thecables.

2. Use a Phillips screwdriver to remove the four screws from the mounting ears on both sidesof the faulty fan box, and then pull the box out of the cabinet along the guide rails gently,as shown in Figure 5-51.




Issue 02 (2011-05-25)

WARNINGWhen removing the fan box, do not touch a rotating fan to avoid injury of your hands.

Figure 5-51 Removing the fan box

Step 4 Place the fan box into the ESD box or bag.

Step 5 Install a new fan box.1. Slide the new fan box into the original position slowly, and then tighten the captive screws

on the mounting ears of the fan box.2. Connect the cables that were disconnected from the removed fan box to the ports on the

new fan box.

Step 6 Set the circuit breaker labeled SW6 on the DCDU-11A to ON.

Step 7 Check the status of the indicators to determine whether the new fan box works properly. Fordetails about the status of the indicators, see CMUE.


----End


into a carton padded with foam or into the packing box of the new component.l Fill in the fault form with detailed information about the removed component.



5-41


5.4.2 Replacing an RFUReplacing an radio frequency unit (RFU) interrupts the services carried on the RFU.

Prerequisitel The type of faulty RFU is confirmed. For details about how to confirm the type of RFU,

do as follows:– If the RFU can be queried online, run the associated command on the local maintenance

terminal (LMT). For details, see 5.1.1 Query Electronic Label of the Board.– If the RFU is faulty and cannot be queried online, the information about the RFU can

be queried offline on the M2000. For details, see the procedure for querying inventorydata in the associated M2000 document.

l Tools and materials, such as an electrostatic discharge (ESD) wrist strap or a pair of ESDgloves, Phillips screwdriver, ESD box or bag, dustfree cloth, key to the cabinet door, andtorque wrench, are ready.

l Associated personnel have obtained keys and site access permissions.

Contextl RFUs include a DRFU, GRFU V1, GRFU V2, GRFU V2a, MRFU V1, MRFU V2, MRFU

V2a, MRFUd, WRFU, WRFUd, LRFU, and LRFUe.l Replacing an RFU interrupts the services carried on the RFU.l It takes about 6 to 10 minutes to replace an RFU, which involves disconnecting cables,

removing screws, removing the faulty RFU, inserting a new RFU, tightening the screws,reconnecting the cables to the new RFU, and loading software.

l GRFUs V2 can replace GRFUs V1, but GRFUs V1 cannot replace GRFUs V2. For thedetails about the difference between GRFUs V1 and GRFUs V2, see GRFU.

l MRFUs V2 can replace MRFUs V1, but MRFUs V1 cannot replace MRFUs V2. For thedetails about the difference between MRFUs V1 and MRFUs V2, see MRFU.

l A maximum of six RFUs can be configured in a BTS3900A. The positions of the RFUsare shown in "1" of Figure 5-52.




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Figure 5-52 RFU positions

(1) RFUs (2) Power switches on the RFUs (3) Handle

Procedure

Step 1 If a base station must be relocated, check for the maximum output power locking for TX channelsof the RFUs to be replaced. If the maximum output power locking is enabled, disable thefunction.

NOTE

l If an RFU is faulty and must be repaired, the maximum output power locking does not need to bedisabled.

l Power locking can be enabled only for MRFU V2 (P900 MHz), MRFUd, WRFUd, and LRFUe. If theRFU is faulty and must be repaired, power locking does not need to be disabled.

1. Query the maximum output power of the TX channels of the RFU.

l On the UMTS side, run the DSP RRU command to query the maximum output powerof the TX channels of the RFU according to the cabinet number, slot number, and slotnumber of the RFU.



5-43

l On the LTE side, run the DSP RRU command to query the maximum output power ofthe TX channels of the RFU according to the cabinet number, slot number, and slotnumber of the RFU.

l On the GSM side, log in to the SMT. In the left pane of the Site Maintenance TerminalSystem window, click Site. In the right pane of the window, double-click Lock RXUTraffic Capability. The Lock RXU Traffic Capability window is displayed. In thedisplayed window, click the Query Config tab. On the displayed tab page, select thetarget RFU.

If ... Then ...

The maximum output power locking isenabled for TX channels

Go to Step 1.2.

The maximum output power locking is notenabled for TX channels

Go to Step 2.

2. Set the maximum output power of the TX channels of the RFU to 0 and disable the

maximum output power locking.l On the UMTS side, run the LOC RRUTC command to disable the maximum output

power locking for TX channels of the RFU.l On the LTE side, run the LOC RRUTC command to disable the maximum output

power locking for TX channels of the RFU.l On the GSM side, log in to the SMT. In the left pane of the Site Maintenance Terminal

System window, click Site. In the right pane of the window, double-click Lock RXUTraffic Capability. The Lock RXU Traffic Capability window is displayed. In thedisplayed window, click the Config tab. On the displayed tab page, select the targetRFU.

NOTE

l If there is more than one RFU, set the TX channels of each RFU.

Step 2 Notify the M2000 administrator to unblock the corresponding RFU.l Run the BLK BRD command to block the RFU in the NodeB.l Run the BLK BRD command to block the RFU in the eNodeB.l Run the SET GCELLADMSTAT command to block the TRX of RFU in the base station

controller (BSC).

NOTE

l Block the RFU before replacing the module or separately replacing the RF jumper.

l If the RFU to be replaced works in a multi-mode base station, block the RFU working in multiplemodes.

l The RFU cannot be blocked on the GSM side. Only the TRX of the RFU can be blocked.

Step 3 Verify that TX channels of the RFU are disabled. In this case, the ACT indicator on the RFUpanel blinks (on for 1s and off for 1s).





Issue 02 (2011-05-25)


Step 5 Turn off the power switches on the RFUs in the sector to which the faulty RFU belongs. Thepositions of the power switches are shown in "2" of Figure 5-52.

Step 6 Label the power cable of the faulty RFU, and disconnect the cable.

Step 7 Label the RF jumper of the faulty RFU, loosen the DIN 7/16 elbow male connector of the RFjumper, and disconnect the RF jumper.

Step 8 Label the common public radio frequency (CPRI) cable of the RFU, and disconnect the fiber.

Step 9 Loosen the screws at the four corners of the RFU by using a Phillips screwdriver, and then pullthe RFU by using the handle to move it outwards 50 mm to 100 mm, as shown in Figure5-53. Hold the RFU with one hand, and remove the RFU from the cabinet with the other hand.

Figure 5-53 Removing the RFU

Step 10 Place the removed RFU in an ESD box, and place the handle back to the original position.

Step 11 Place the new RFU on guide rails, and slide it along the rails until it snaps shut.

Step 12 Tighten the captive screws at the four corners of the RFU panel to secure the RFU in the subrack.

Step 13 Connect the labeled CPRI optical fiber to the new RFU.

Step 14 Connect the labeled RF jumper to the new RFU, and tighten the DIN male elbow connector to25 N·m to 35 N·m using a torque wrench.

Step 15 Connect the labeled power cable to the new RFU and tighten it.

Step 16 Turn on the power switches on the RFUs.



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Step 17 Check the operating status of the RFU by observing indicator status. For details about the statusof the indicators, see the RFU hardware description.

Step 18 Perform the following operations on the LMT:1. If the maximum output power locking must be enabled for TX channels, go to Step 1.2 to

set this function.2. Check whether alarms are reported by referring to Browsing Alarms. If an alarm is reported,


Step 19 The operations for M2000 are as follows:1. Run the MML command to unblock the RFU.

l Run the UBL BRD command to unblock the RFU in the NodeB.l Run the UBL BRD command to unblock the RFU in the eNodeB.l On the GSM side, run the SET GTRXADMSTAT command to unblock the TRX of

the RFU on the BSC.2. Synchronize the inventory information manually. For details, see the M2000 Software and


Step 20 Take off the ESD wrist strap or gloves, and pack up all the tools.

NOTE

After replacing the RFU, decide whether to immediately add the new TRX to the frequency-hoppingsequence according to the actual situation. For details, see the TRX Mutual Aid function in the SingleRANReconfiguration Guide.

----End


into a carton padded with foam or into the packing box of the new module.l Fill in the fault form to record detailed information of the replaced component.l Contact the local Huawei office to handle the faulty component.

5.4.3 Replacing the DCDU-11AIf the DCDU-11A is faulty and cannot be repaired promptly, you must replace it.




to be replaced.

Contextl Figure 5-54 shows the position of the DCDU-11A in a cabinet.




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l The DCDU-11A supplies power to the RFUs and the fan box in the radio frequency cabinet(RFC). Replacing the DCDU-11A interrupts services carried on the modules.

l It takes about 20 minutes to replace the DCDU-11A.

Figure 5-54 DCDU-11A position

(1) DCDU-11A (2) Power switches of the DCDU-11A

Procedure



Step 2 Record the status of SW0 to SW9 circuit breakers on the DCDU-11A to OFF, and set the circuitbreakers to OFF.

Step 3 Set the AC output circuit breaker labeled RFC1 or RFC2 on the embedded power subrack unit(EPU) to OFF.

Step 4 Remove the faulty DCDU-11A.



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1. Record the positions of the connectors on the DCDU-11A panel, and then disconnect theconnectors.

2. Use a Phillips screwdriver to remove the protective cover for the DC input wiring terminalblock from the DCDU-11A, as shown in Figure 5-55.

3. Record the connections of the input power cables, and then disconnect the cables.4. Use a Phillips screwdriver to remove the four captive screws from both sides of the

DCDU-11A, and then pull the DCDU-11A out of the cabinet along the guide rails gently,as shown in Figure 5-56.

Figure 5-55 Removing the protective cover for the DC input terminal block




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Figure 5-56 Removing the DCDU-11A

Step 5 Place the DCDU-11A and protective covers into the ESD box or bag.

Step 6 Install a new DCDU-11A.1. Slide the new DCDU-11A into the original position, and then tighten the four captive screws

on both sides.2. Remove the protective cover for the DC input terminal block from the new DCDU-11A,

connect the power cables that were disconnected from the old DCDU-11A to the newDCDU-11A based on the records, and then install the protective cover.

3. Install the connectors that were disconnected from the old DCDU-11A to the newDCDU-11A based on the cable connection records.

Step 7 Set the circuit breaker labeled RFC1 or RFC2 to ON.

Step 8 Set the circuit breakers described in Step 2 to ON.

Step 9 Check that the new DCDU-11A works properly against Table 5-1.

Table 5-1 DCDU-11A checklist

Item Status Remarks

Indicator on theCMUE of the fanbox in the RFC

The RUN indicatorblinks green rapidly (onfor 0.125s and off for0.125s) or slowly (on for1s and off for 1s).

For details about the indicator status, seeCMUE.

Indicator on theRFU panel

For details about the indicator status, see thesection "RFC Components" of theBTS3900A (Ver.C) Hardware Description.



5-49


----End











Contextl Figure 5-57 shows the position of the ELU.

l It takes about 5 minutes to replace an ELU.

Figure 5-57 Position of the ELU




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Procedure



Step 2 Remove the faulty ELU.1. Disconnect the cable from the RJ45 port on the top of the ELU housing.2. Slide the ELU housing upwards to remove it according to the arrow direction, as shown in

Figure 5-58.

Figure 5-58 Removing the ELU housing

3. Use a Phillips screwdriver to remove the two M4×8 screw assemblies from the ELU, as

shown in Figure 5-59.

Figure 5-59 Removing the ELU

Step 3 Place the removed ELU in the ESD box or bag.

Step 4 Install a new ELU.1. Place the new ELU in the corresponding position, and then use a Phillips screwdriver to

tighten two M4×8 screw assemblies to 1 N·m (8.85 lbf·in.).



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2. Connect the cable that was disconnected from the RJ45 port in Step 2.1 to the top of theELU housing.


----End


into a carton padded with foam or into the packing box of the new component.l Fill in the fault form with detailed information about the removed component.l Contact the local Huawei office to handle the faulty component.

5.5 Replacing APM30H ComponentsIf you power off an APM30H component for maintenance, you must restore power to it within48 hours.

5.5.1 Replacing the EPUIf the embedded power subrack unit (EPU) is faulty and cannot be repaired in a short period,you must replace it.

5.5.2 Replacing a PMUIf the power monitoring unit (PMU) is faulty and cannot be repaired in a short period, you mustreplace it.

5.5.3 Replacing a PSUIf a power supply unit (PSU) is faulty and cannot be repaired in a short period, you must replaceit.

5.5.4 Replacing the AC Surge ProtectorIf the AC surge protector is faulty, you must replace it.

5.5.5 Replacing the FuseIf a fuse cannot meet the high-current requirement for a DC output port on the embedded powersubrack unit (EPU), it must be replaced. If the port supplies power to the BBU, replacing thefuse interrupts all the services carried by the base station.

5.5.6 Replacing the Fan BoxReplace the fan box in the APM30H if it is faulty.

5.5.7 Replacing the Fan in the Front DoorIf the fan in the front door of the APM30H cabinet is faulty and cannot be repaired in time, youmust replace it.

5.5.8 Replacing the AC HAUIf the AC heater assembly unit (HAU) in the APM30H cabinet is faulty and cannot be repairedin time, you must replace it.





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5.5.1 Replacing the EPUIf the embedded power subrack unit (EPU) is faulty and cannot be repaired in a short period,you must replace it.




to be replaced.

Contextl Figure 5-60 shows the position of the EPU in the APM30H cabinet.l Replacing the EPU interrupts all the services carried on the base station.l It takes about 30 minutes to replace the EPU.

Figure 5-60 Position of the EPU

Procedure





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Step 2 Switch off the external AC input power to the APM30H cabinet.

Step 3 Remove the power monitoring unit (PMU) and all the power supply units (PSUs) from the EPU.For details, see 5.5.2 Replacing a PMU and 5.5.3 Replacing a PSU.

Step 4 Remove the cables from the EPU.1. Loosen the two captive screws on the metal protective cover on the left of the EPU, and

then remove the cover.2. Use a Phillips screwdriver to remove the plastic protective covers from the terminal blocks

on the left of the EPU.3. Record the connections of the AC input and output power cables, and then disconnect the

cables.4. Install the two plastic protective covers in the original positions.5. Record the connections of the DC cables to the EPU panel, and then disconnect the DC

cables.6. Record the connections of the DC cables that are interconnected to the cables on the right

of the EPU, and then disconnect the DC cables.7. Record the connection of the PGND cable (the other end of which is connected to the ground

bar on the left of the cabinet) to the EPU, and then disconnect the cable from the EPU.

CAUTIONThe PE wire of the AC input power cable is connected to a hexagonal screw on a mountingear of the EPU. The hexagonal screw must be stored properly after the PE wire isdisconnected.

Step 5 Use a Phillips screwdriver to remove the eight remaining captive screws from both sides of theEPU, and then gently pull the EPU out of the cabinet along the guide rails, as shown in Figure5-61.

CAUTIONThe EPU is heavy. Therefore, hold the bottom of the EPU with one hand, and slowly pull theEPU out with the other hand. This prevents it from falling and ensures personal safety.




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Figure 5-61 Removing the EPU

Step 6 Place the removed EPU into the ESD box or bag.

Step 7 Install a new EPU.1. Slide the new EPU into the original position of the faulty EPU along the guide rails, and

then tighten the eight buttress threaded screws on both sides.2. Connect the PGND cable that was disconnected in Step 4.7.

CAUTIONThe PE wire of the AC input power cable must be installed on the hexagon screw that wasremoved in Step 4.7. Otherwise, the EPU might be damaged due to improper groundingafter power-on.

3. Install the DC power cables that were disconnected in Step 4.6 and Step 4.5.4. Connect the AC power cables that were disconnected in Step 4.3.

WARNINGIf the replaced EPU subrack supplied with 220 V AC three-phase power, remove the short-circuiting bar on the AC INPUT wiring terminals of the new EPU subrack.

5. Install the metal protective cover that was removed in Step 4.1.6. Install the removed PMU and PSUs into the EPU. For details, see 5.5.2 Replacing a

PMU and 5.5.3 Replacing a PSU.



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Step 8 Power on the new EPU.1. Switch on the external AC input power to the APM30H cabinet.2. Set the circuit breakers that were set to OFF in Step 2 to ON.3. Check the operating status of the new EPU by observing the indicators on the PMU and

PSUs. For details about the status of the indicators, see PMU and PSU.


----End



5.5.2 Replacing a PMUIf the power monitoring unit (PMU) is faulty and cannot be repaired in a short period, you mustreplace it.




to be replaced.

Contextl Figure 5-62 shows the position of the PMU in the APM30H cabinet.l The PMU is hot-swappable.l It takes about 5 minutes to replace a PMU.




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Figure 5-62 Position of the PMU

Procedure



Step 2 Remove the faulty PMU, as shown in Figure 5-63.

1. Record the connections of the cables on the PMU panel, and then disconnect the cables.

2. Use a flat-head screwdriver to loosen the two M2.5 captive screws on the ejector lever ofthe PMU panel.

3. Gently pull the ejector lever to disconnect the buckle of the PMU from the subrack, andthen remove the PMU from the subrack.

Figure 5-63 Removing the PMU



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Step 3 Place the PMU in the ESD box or bag.

Step 4 Take out a new PMU, and set the pins on the DIP switch on the PMU to the same positions asthose on the faulty PMU, as shown in Figure 5-64.

Figure 5-64 The position of the DIP switch

Step 5 Install the new PMU, as shown in Figure 5-65.

1. Use a flat-head screwdriver to loosen the two M2.5 captive screws on the ejector lever ofthe PMU panel, and then lower the ejector lever.

2. Gently slide the new PMU into the EPU along the guide rails, and then raise the ejectorlever.

3. Use a flat-head screwdriver to tighten the screws to 0.3 N·m (2.66 lbf·in.).

4. Connect the cables that were disconnected from the removed PMU to the ports on the newPMU.

Figure 5-65 Installing the PMU




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Step 6 Check the status of the LEDs to determine whether the new PMU works properly. For detailson the status of the LEDs, see PMU.


----End



5.5.3 Replacing a PSUIf a power supply unit (PSU) is faulty and cannot be repaired in a short period, you must replaceit.




to be replaced.

Contextl Figure 5-66 shows the positions of the PSUs in the APM30H cabinet.l A PSU is hot-swappable.l It takes about 3 minutes to replace a PSU.

Figure 5-66 Positions of PSUs



5-59

Procedure



Step 2 Remove a PSU, as shown in Figure 5-67.1. Use a flat-head screwdriver to loosen the two M2.5 captive screws on the ejector lever of

the PSU panel.2. Gently pull the ejector lever to disconnect the buckle of the PSU from the subrack, and then

remove the PSU from the subrack.

WARNINGAfter lowering the ejector levers, quickly remove the PSU to prevent damage caused by theconflict between the backplane port on the PSU and the corresponding slot.

Figure 5-67 Removing the PSU

Step 3 Place the PSU in the ESD box or bag.

Step 4 Install a PSU, as shown in Figure 5-68.1. Use a flat-head screwdriver to loosen the two M2.5 captive screws on the ejector lever of

the PSU panel to lower the ejector lever.2. Gently slide the new PSU into the corresponding subrack along the guide rails, and then

raise the ejector lever.3. Use a flat-head screwdriver to tighten the screws on the ejector lever of the PSU to 0.3 N·m

(2.66 lbf·in.).




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Figure 5-68 Installing the PSU

Step 5 Check the status of the LEDs to determine whether the new module works properly. For detailson the status of the LEDs, see PSU.


----End





5.5.4 Replacing the AC Surge ProtectorIf the AC surge protector is faulty, you must replace it.

Prerequisitel Tools and materials, such as an electrostatic discharge (ESD) wrist strap or ESD gloves

and an ESD box or bag, are ready.






5-61

Contextl Figure 5-69 shows the position of the AC surge protection module in the embedded power

subrack unit (EPU).l When the color of the protecting hood on the front panel of the surge protector changes

from green to red, the protector is faulty and you must replace it.

Figure 5-69 Installation position of the AC surge protector

(1) AC surge protection module (2) EPU

Procedure



Step 2 Press the top and bottom of the surge protection module, and then remove the protection module,as shown in Figure 5-70.




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Figure 5-70 Removing the surge protector

Step 3 Place the surge protection module into the ESD box or bag.

Step 4 Place the new surge protector in the corresponding slot, and then push it until it is securelyinstalled.

Step 5 Check the color of the protecting hood on the front panel of the surge protector to determinewhether the new surge protector works properly. When the surge protector works properly, thecolor is green.


----End



5.5.5 Replacing the FuseIf a fuse cannot meet the high-current requirement for a DC output port on the embedded powersubrack unit (EPU), it must be replaced. If the port supplies power to the BBU, replacing thefuse interrupts all the services carried by the base station.

Prerequisitel Tools and materials, such as an electrostatic discharge (ESD) wrist strap or ESD gloves

and an ESD box or bag, are ready.l The model of the component to be replaced is confirmed by referring to 5.1.2 Querying

Electronic Cabinet Labels, and a new component of the same model is ready.



5-63

l Associated personnel have obtained keys and site access permission.l The new component is intact, and its hardware version is the same as that of the component

to be replaced.

Contextl Figure 5-71 shows the position of the fuse and spare fuse box in the EPU.

Figure 5-71 Installation position of the fuse and spare fuse box

(1) Fuse (2) Spare fuse box

(3) Extraction tool (4) EPU

l The fuse is hot-swappable.l Replacing a fuse interrupts all the services carried by the corresponding module.

CAUTIONThe specifications of the fuse vary according to the ambient temperature. For details on thederating of the fuse, see the general specifications of the fuse. If the fuse works at a normaltemperature of 25°C, the operating current cannot be greater than 75% of its rated current.

Procedure






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Step 2 Turn off the power switch for the module corresponding to the fuse to be replaced.

Step 3 Take the extraction tool out of the mounting ear on the right of the EPU, as shown in Figure5-72.

Figure 5-72 Taking the extraction tool

Step 4 Use the extraction tool to remove the fuse to be replaced, as shown in Figure 5-73.

Figure 5-73 Removing the faulty fuse

Step 5 Place the fuse into the ESD box or bag.

Step 6 Take a new fuse from the spare fuse box, as shown in Figure 5-74.



5-65

Figure 5-74 Taking the spare fuse

Step 7 Insert the new fuse into the corresponding port.

Step 8 Turn on the power switch that was turned off in Step 2, and determine whether the new fuseworks properly based on the operating status of the module.


----End



5.5.6 Replacing the Fan BoxReplace the fan box in the APM30H if it is faulty.




to be replaced.

Contextl Figure 5-75 shows the position of the fan box in the APM30H cabinet.




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l The fan box houses the HERT power monitoring interface unit (HPMI), central monitoringunit type E (CMUE), and fans. If any of the components is faulty, the fan box must bereplaced.



(1) Fan box (2) Fuse for the power supply to the fan box

Procedure



Step 2 Remove the fuse from the FUSE 5 slot on the embedded power subrack unit (EPU) by referringto 5.5.5 Replacing the Fuse.


1. Record the connections of the cables on the panel of the fan box, and then disconnect thecables.

NOTE

When disconnecting the RJ45 connector from the CMUE, hold the connector with a hand using the vacanttrough in the upper baffle plate, as shown in Figure 5-76.



5-67

Figure 5-76 Plan view of the fan box

2. Use a Phillips screwdriver to remove the four screws on the mounting ears of the fan box,

and then gently pull the box out, as shown in Figure 5-77.

DANGERWhen removing the fan box, do not touch the air inlet at the bottom of the fan box.





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Step 5 Install a new fan box.

1. Slide the new fan box into the original position slowly, and then tighten the captive screwson the mounting ears of the fan box.

2. Connect the cables that were disconnected from the removed fan box to the ports on thenew fan box.

NOTE

Link the DB50 connector on the environment monitoring signal cable perpendicularly to the HPMIpanel using both hands to prevent false monitoring alarms caused by bent pins.

Step 6 Insert the fuse into the FUSE 5 slot on the EPU.



----End





5.5.7 Replacing the Fan in the Front DoorIf the fan in the front door of the APM30H cabinet is faulty and cannot be repaired in time, youmust replace it.






Contextl Figure 5-78 shows the position of the fan in the front door of the APM30H cabinet.

l It takes about 20 minutes to replace the fan.



5-69

Figure 5-78 Position of the fan in the front door

(1) Fan in the front door (2) Fuse for the power supply to the fan

Procedure



Step 2 Remove the fuse from the FUSE 5 slot on the embedded power subrack unit (EPU) by referringto 5.5.5 Replacing the Fuse.

Step 3 Remove the faulty fan.1. Record the connection of the cable for the faulty fan on the fan power transfer plate,

disconnect the cable, and remove the rubber plug from the cable hole, as shown in Figure5-79.




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Figure 5-79 Removing the fan cable

2. Use a Phillips screwdriver to remove the five screws from the air duct, use a socket

screwdriver to remove the nut from under the air duct, and then remove the air duct, asshown in Figure 5-80.

Figure 5-80 Removing the air duct

3. Use a Phillips screwdriver to remove the 10 screws from the heat exchanger, and then

remove the heat exchanger from the front door, as shown in Figure 5-81.



5-71

Figure 5-81 Removing the heat exchanger

4. Use a Phillips screwdriver to remove the five screws from the cover plate for the fan cavity,

and remove the cover plate, as shown in Figure 5-82.

Figure 5-82 Removing the cover plate for the fan cavity




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5. Use a Phillips screwdriver to remove the four screws that are used to secure the fan, andremove the faulty fan, as shown in Figure 5-83.

Figure 5-83 Removing the fan

Step 4 Place the fan into the ESD box or bag.

Step 5 Install a new fan.

1. Install the new fan in the fan cavity, and then tighten the four screws on the fan.

2. Reinstall the cover plate of the fan cavity on the heat exchanger, and then tighten the fivescrews on the cover plate of the fan cavity.

3. Lead the cable for the new fan through the cable outlet on the right of the front door, andthen install a rubber cap on the cable outlet.

4. Install the heat exchanger in the front door, and then tighten the 10 screws on the panel ofthe heat exchanger.

5. Reinstall the air duct on the heat exchanger, and then tighten the five screws and one nut.

6. Reinstall the cable for the new fan on the fan transfer board based on the cable connectionsrecorded.

Step 6 Insert the fuse into the FUSE 5 slot on the EPU.

Step 7 Check the running of the fan and status of the indicators on the CMUE to determine whether thenew fan works properly. For details about the status of the indicators, see CMUE.



5-73


----End



5.5.8 Replacing the AC HAUIf the AC heater assembly unit (HAU) in the APM30H cabinet is faulty and cannot be repairedin time, you must replace it.




to be replaced.

Contextl The HAU can be installed in a 1 U transmission space based on actual configurations, as


WARNINGAfter the installation, do not change the position of the heater during the routine operation.

l It takes about 5 minutes to replace the HAU.




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Figure 5-84 Position of the HAU in the APM30H cabinet

(1) HAU (2) Power switch for the HAU

Procedure



Step 2 Set the power switch for the HAU to OFF. Figure 5-84 shows the position of the power switch.

Step 3 Remove the faulty HAU, as shown in Figure 5-85.1. Unplug the power plug on the HAU.2. Use a Phillips screwdriver to remove the four captive screws on the HAU panel, and then

gently pull the HAU out.



5-75

Figure 5-85 Removing the HAU

Step 4 Place the HAU into the ESD box or bag.

Step 5 Install a new HAU, as shown in Figure 5-86.1. Place the new HAU in the original position, and gently slide the HAU into the cabinet.2. Use a Phillips screwdriver to tighten the four captive screws on the HAU panel.3. Connect the power plug to the power supply socket on the HAU.

Figure 5-86 Installing the HAU

Step 6 Set the power switch that was set to OFF in Step 2 to ON.


----End







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Procedure



Step 2 Remove the faulty ELU.

1. Disconnect the cable from the RJ45 port on the top of the ELU housing.

2. Slide the ELU housing upwards to remove it according to the arrow direction, as shown inFigure 5-88.



5-77


3. Use a Phillips screwdriver to remove the two M4×8 screw assemblies from the ELU, asshown in Figure 5-89.



Step 4 Install a new ELU.

1. Place the new ELU in the corresponding position, and then use a Phillips screwdriver totighten two M4×8 screw assemblies to 1 N·m (8.85 lbf·in.).



----End








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5.6 Replacing IBBS200T ComponentsIf you power off the base station during the maintenance of an IBBS200T component, you mustrestore power to the base station within 48 hours.

5.6.1 Replacing the BatteriesIf batteries are faulty or deteriorate, you must replace them. Generally, batteries are replaced inbatches.

5.6.2 Replacing a TEC UnitThe TEC cooler helps dissipate the heat of batteries to ensure the normal operation of theIBBS200T in high-temperature areas. If the TEC cooler is faulty and cannot be repaired in time,you must replace it.

5.6.3 Replacing the CMUEIf the central monitoring unit type E (CMUE) in the front door of the IBBS200D or IBBS200Tcabinet is faulty, you must replace it.

5.6.4 Replacing the ELUIf the electronic label unit (ELU) is faulty, you must replace it.





to be replaced.

ContextNOTE

After replacing 50 Ah storage batteries with 92 Ah storage batteries, you must change the value of theBC parameter. Otherwise, the performance of the storage batteries is affected.

DANGERDuring the replacement, short circuits or reverse connections cannot exist between the positiveand negative poles of the batteries. All the tools such as wrenches and screwdrivers must becoated with insulation tubes. This prevents the batteries from being burned and ensures personalsafety.



5-79

Procedure



Step 2 Set the circuit breakers for the input and output power on the power distribution box (PDB) inthe storage battery cabinet to OFF, as shown in section 2 of Figure 5-90.

Step 3 Set the circuit breaker labeled BAT on the embedded power subrack unit (EPU) panel to OFF,as shown in section 1 of Figure 5-90.

Figure 5-90 Power switches of the storage batteries

(1) Circuit breaker labeled BAT on the embeddedpower subrack unit (EPU) in the advance powermodule with a heat-exchanger cooler (APM30H)

(2) Circuit breakers labeled BAT_SW0 and BAT_SW1on the power distribution box of the storage batterycabinet

Step 4 Remove the power cables from the upper and lower storage batteries, as shown in Figure5-91.

1. Remove the positive (red) and negative (black) power cables from the storage batteries,and then remove the terminal covers.

2. Remove the copper bars from the poles of the storage batteries.

3. Install the terminal covers on the poles of the storage batteries.




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Figure 5-91 Removing the power cable for the storage batteries

Step 5 Move the baffle plate to facilitate the removal of the upper storage batteries, as shown in Figure5-92.

1. Loosen the three screws on the baffle plate.

2. Move the baffle plate down until each screw reaches the top of a screw hole on the plate.

Figure 5-92 Moving the baffle plate

(1) Baffle plate



5-81

Step 6 Remove the storage batteries, as shown in Figure 5-93.

NOTE

l Remove the storage batteries from top to bottom and from right to left.

l Hold the traction sling on a storage battery, gently pull the battery out, and then hold the battery with bothhands to put it in a safe place.

Figure 5-93 Removing the storage batteries

Step 7 Install new storage batteries. For details, see Installing Storage Batteries.

1. Install the storage batteries from bottom to top and from left to right.

2. Secure the baffle plate.

3. Install the power cables for the storage batteries.

Step 8 Set the circuit breaker labeled BAT on the EPU panel to ON.

Step 9 Set all the circuit breakers on the PDB in the storage battery cabinet to ON.


----End








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5.6.2 Replacing a TEC UnitThe TEC cooler helps dissipate the heat of batteries to ensure the normal operation of theIBBS200T in high-temperature areas. If the TEC cooler is faulty and cannot be repaired in time,you must replace it.




to be replaced.

Contextl Figure 5-94 shows the position of the TEC in the cabinet.l It takes about 20 minutes to replace the TEC.

Figure 5-94 Positions of a TEC unit

(1) TEC (2) Power switch for the TEC

Procedure




5-83


Step 2 Set the circuit breaker labeled FAN/TEC_SW2 on the power distribution box (PDB) to OFF.

Step 3 Remove the faulty TEC.1. Use a Phillips screwdriver to remove the two screws from the CMUE installation module,

and then remove the cover plate, as shown in Figure 5-95.2. Record the connections of the cables on the CMUE near the TEC, and then disconnect the

cables.3. Remove the two screws from the TEC protective cover on the inner side of the front door,

and then remove the cover, as shown in Figure 5-95.4. Use a Phillips screwdriver to remove the six M4 screws from the TEC, and then remove

the TEC, as shown in Figure 5-96.

Figure 5-95 Removing the TEC protective cover




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Figure 5-96 Removing the TEC

Step 4 Place the TEC into the ESD box or bag.

Step 5 Install a new TEC.

1. Route the cable for the new TEC through the cover plate for the front door to the CMUE,and then use six M4 screws to secure the TEC on the cover plate.

2. Install the TEC protective cover, and then install the two screws to secure the cover.

3. Connect the cables to the corresponding ports on the CMUE based on the previous records.

4. Place the CMUE installation module in the original position, and then install the two screwson the module.

Step 6 Set the circuit breaker labeled FAN/TEC_SW2 on the PDB to ON.

Step 7 Check the running of the fans and the status of the indicators on the CMUE to determine whetherthe new TEC works properly. For details about the status of the indicators, see CMUE.


----End








5-85




to be replaced.

Contextl Figure 5-97 shows the position of the CMUE in the front door of an IBBS200T cabinet.l It takes about 5 minutes to replace the CMUE.

Figure 5-97 Position of the CMUE

(1) CMUE (2) Power switch for the CMUE

Procedure




Step 3 Remove the faulty CMUE.1. Use a Phillips screwdriver to remove the two screws from the CMUE installation module,

and then remove the module, as shown in Figure 5-98.




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Figure 5-98 Removing the CMUE installation module

2. Record the connections of the cables on the CMUE, and then disconnect the cables.3. Use a Phillips screwdriver to loosen the four screws on the CMUE, and remove the CMUE.4. Take out a new CMUE, and then install the jumper pins that were removed from the faulty

CMUE on the new CMUE. Figure 5-99 shows the positions of the jumper pins.

Figure 5-99 Positions of the jumper pins

Step 4 Place the removed CMUE into the ESD box or bag.

Step 5 Install the new CMUE.1. Attach the bar code label delivered with the new CMUE to the corresponding position on

the CMUE installation module. Figure 5-100 shows the position of the label.



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Figure 5-100 Position of the label on the CMUE

2. Place the new CMUE in the original position on the CMUE installation module, and theninstall the four screws.

3. Connect the cables that were disconnected from the removed CMUE to the ports on thenew CMUE.

4. Place the CMUE installation module in the original position, and tighten screws to securethe module.


Step 7 Check the status of the indicators to determine whether the new CMUE works properly. Fordetails about the status of the indicators, see CMUE.


----End











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l It takes about 10 minutes to replace the ELU.


Procedure



Step 2 Remove the first storage battery on the left in the upper layer of the storage battery cabinet tofacilitate the ELU operations, as shown in Figure 5-102. For details about how to remove thestorage battery, see 5.6.1 Replacing the Batteries.

WARNINGPower off the storage battery before removing the battery.



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Figure 5-102 Removing the upper-left storage battery


Figure 5-103.








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Step 5 Install a new ELU.1. Place the new ELU in the corresponding position, and then use a Phillips screwdriver to

tighten two M4×8 screw assemblies to 1 N·m (8.85 lbf·in.).2. Connect the cable that was disconnected from the RJ45 port in 2.a to the top of the ELU

housing.

Step 6 Install the removed storage battery. For details, see Installing Storage Batteries.

CAUTIONPower on the storage battery after installing the battery.


----End



5.7 Replacing IBBS200D ComponentsIf you power off the base station during the maintenance of an IBBS200D component, you mustrestore power to the base station within 48 hours.


5.7.2 Replacing a Fan in the Front DoorReplace the centrifugal fan on the front door of the IBBS200D if it is faulty and cannot berepaired.






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to be replaced.

ContextNOTE

After replacing 50 Ah storage batteries with 92 Ah storage batteries, you must change the value of theBC parameter. Otherwise, the performance of the storage batteries is affected.

DANGERDuring the replacement, short circuits or reverse connections cannot exist between the positiveand negative poles of the batteries. All the tools such as wrenches and screwdrivers must becoated with insulation tubes. This prevents the batteries from being burned and ensures personalsafety.

Procedure



Step 2 Set the circuit breakers for the input and output power on the power distribution box (PDB) inthe storage battery cabinet to OFF, as shown in section 2 of Figure 5-105.

Step 3 Set the circuit breaker labeled BAT on the embedded power subrack unit (EPU) panel to OFF,as shown in section 1 of Figure 5-105.




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Figure 5-105 Power switches of the storage batteries

(1) Circuit breaker labeled BAT on the embeddedpower subrack unit (EPU) in the advance powermodule with a heat-exchanger cooler (APM30H)

(2) Circuit breakers labeled BAT_SW0 and BAT_SW1on the power distribution box of the storage batterycabinet

Step 4 Remove the power cables from the upper and lower storage batteries, as shown in Figure5-106.1. Remove the positive (red) and negative (black) power cables from the storage batteries,

and then remove the terminal covers.2. Remove the copper bars from the poles of the storage batteries.3. Install the terminal covers on the poles of the storage batteries.



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Figure 5-106 Removing the power cable for the storage batteries

Step 5 Move the baffle plate to facilitate the removal of the upper storage batteries, as shown in Figure5-107.

1. Loosen the three screws on the baffle plate.

2. Move the baffle plate down until each screw reaches the top of a screw hole on the plate.

Figure 5-107 Moving the baffle plate

(1) Baffle plate




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Step 6 Remove the storage batteries, as shown in Figure 5-108.NOTE

l Remove the storage batteries from top to bottom and from right to left.l Hold the traction sling on a storage battery, gently pull the battery out, and then hold the battery with both

hands to put it in a safe place.

Figure 5-108 Removing the storage batteries

Step 7 Install new storage batteries. For details, see Installing Storage Batteries.1. Install the storage batteries from bottom to top and from left to right.2. Secure the baffle plate.3. Install the power cables for the storage batteries.

Step 8 Set the circuit breaker labeled BAT on the EPU panel to ON.

Step 9 Set all the circuit breakers on the PDB in the storage battery cabinet to ON.


----End



5.7.2 Replacing a Fan in the Front DoorReplace the centrifugal fan on the front door of the IBBS200D if it is faulty and cannot berepaired.



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to be replaced.

Contextl Figure 5-109 shows the positions of the fans in the front door of the IBBS200D cabinet.l The fan box on the front door of the IBBS200D houses two centrifugal fans. When

maintaining the fan box, you need to replace only the faulty fan. This example describeshow to replace the fan on the left side.

l It takes about 20 minutes to replace the fan.

Figure 5-109 Positions of the fans in the front door of the IBBS200D cabinet

(1) Fans in the front door (2) Power switch for the fan in the front door

Procedure







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1. Record the connections of the cables on the fan installation module, and then disconnectthe cables.

2. Use a Phillips screwdriver to remove the five screws from the fan installation module, andthen remove the module, as shown in Figure 5-110.

Figure 5-110 Removing the fan installation module

3. Record the connections of the cables on the central monitoring unit type E (CMUE) relatedto the faulty fan, and then disconnect the cables.

4. Use a Phillips screwdriver to remove the four screws that are used to secure the fan, andremove the faulty fan, as shown in Figure 5-111.






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1. Place the new fan in the original position of the faulty fan, and hold the fan with one hand.Then, tighten the four screws to 0.55 N·m (4.87 lbf·in.) with the other hand by using ascrewdriver.

2. Connect the cables to the corresponding ports on the CMUE based on the informationrecorded in Step 3.3.

3. Install the fan installation module on the front door, and tighten the five captive screws onthe module.

4. Connect the cables to the corresponding ports on the lower panel of the fan installationmodule based on the information recorded in Step 3.1.




----End







to be replaced.

Contextl Figure 5-112 shows the position of the CMUE in the front door of the IBBS200D cabinet.l It takes about 5 minutes to replace the CMUE.




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Figure 5-112 Position of the CMUE

(1) CMUE (2) Power switch for the CMUE

Procedure




Step 3 Remove the faulty CMUE.1. Record the connections of the cables on the CMUE, and then disconnect the cables.2. Use a Phillips screwdriver to remove the five screws from the fan installation module, and

then remove the module, as shown in Figure 5-113.



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Figure 5-113 Removing the fan installation module

3. Use a Phillips screwdriver to loosen the four screws on the CMUE, and remove the CMUE.4. Take out a new CMUE, and then install the jumper pins that were removed from the faulty

CMUE on the new CMUE. Figure 5-114 shows the positions of the jumper pins.

Figure 5-114 Positions of the jumper pins

Step 4 Place the removed CMUE into the ESD box or bag.

Step 5 Install the new CMUE.1. Attach the bar code label delivered with the new CMUE to the corresponding position on

the fan installation module. Figure 5-115 shows the position of the label.




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Figure 5-115 Position of the label on the CMUE

2. Place the new CMUE in the original position on the fan installation module, and then install

the four screws.3. Connect the cables that were disconnected from the removed CMUE to the ports on the

new CMUE.4. Install the fan installation module on the front door, and tighten the five captive screws on

the module.


Step 7 Check the status of the indicators to determine whether the new CMUE works properly. Fordetails about the status of the indicators, see CMUE.


----End








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l It takes about 10 minutes to replace the ELU.


Procedure



Step 2 Remove the first storage battery on the left in the upper layer of the storage battery cabinet tofacilitate the ELU operations, as shown in Figure 5-117. For details about how to remove thestorage battery, see 5.7.1 Replacing the Batteries.

WARNINGPower off the storage battery before removing the battery.




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Figure 5-117 Removing the upper-left storage battery


Figure 5-118.







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2. Connect the cable that was disconnected from the RJ45 port in 2.a to the top of the ELUhousing.

Step 6 Install the removed storage battery. For details, see Installing Storage Batteries.

CAUTIONPower on the storage battery after installing the battery.


----End





5.8 Replacing TMC11H ComponentsIf you power off the base station during the maintenance of a TMC11H component, you mustrestore power to the base station within 48 hours.

5.8.1 Replacing the DCDU-11CIf the direct current distribution unit-11C (DCDU-11C) is faulty and cannot be repaired in time,you must replace it.

5.8.2 Replacing the Fan BoxReplace the TMC11H if it is faulty and cannot be repaired.

5.8.3 Replacing the Fan in the Front DoorIf the fan in the front door of the TMC11H cabinet is faulty and cannot be repaired in time, youmust replace it.

5.8.4 Replacing the AC HAUIf the AC heater assembly unit (HAU) in the TMC11H cabinet is faulty and cannot be repairedin time, you must replace it.





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5.8.1 Replacing the DCDU-11CIf the direct current distribution unit-11C (DCDU-11C) is faulty and cannot be repaired in time,you must replace it.




to be replaced.

Contextl Figure 5-120 shows the position of the DCDU-11C in the cabinet.l The DCDU-11C supplies power to the fan box and fan in the front door of the TMC11H.

Therefore, replacing the DCDU-11C interrupts services provided by the components.l It takes about 20 minutes to replace the DCDU-11C.

Figure 5-120 Position of the DCDU-11C

(1) DCDU-11C (2) Power switch for the DCDU-11C



5-105

Procedure



Step 2 Set the circuit breaker labeled TMC on the EPU panel to OFF.

Step 3 Remove the faulty DCDU-11C.1. Record the positions of the connectors on the DCDU-11C panel, and then disconnect the

connectors.2. Use a Phillips screwdriver to remove the protective cover for the DC input terminal block

from the DCDU-11C.3. Record the connections of the input power cables, and then disconnect the cables.4. Use a Phillips screwdriver to remove the four captive screws from both sides of the

DCDU-11C, and then remove the DCDU-11C from the cabinet along the guide rails, asshown in Figure 5-122.

Figure 5-121 Removing the protective cover for the DC input terminal block




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Figure 5-122 Removing the DCDU-11C

Step 4 Place the DCDU-11C and protective covers into the ESD box or bag.

Step 5 Install a new DCDU-11C.

1. Slide the new DCDU-11C into the original position, and then tighten the four captive screwson both sides.

2. Remove the protective cover for the DC input terminal block from the new DCDU-11C,connect the power cables that were disconnected from the old DCDU-11C to the newDCDU-11C based on the records, and then install the protective cover.

3. Install the connectors that were disconnected from the old DCDU-11C to the newDCDU-11C based on the cable connection records.

Step 6 Set the circuit breaker labeled TMC on the EPU panel to ON.

Step 7 Check the running of the fan and status of the indicators on the central monitoring unit type E(CMUE) to determine whether the new fan box and fan in the front door of the TMC11H cabinetworks properly. For details about the status of the indicators, see CMUE.


----End







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5.8.2 Replacing the Fan BoxReplace the TMC11H if it is faulty and cannot be repaired.






Contextl Figure 5-123 shows the position of the fan box in the TMC11H cabinet.

l The fan box houses the HERT power monitoring interface unit (HPMI), central monitoringunit type E (CMUE), and fans. If any of the components is faulty, the fan box must bereplaced.



(1) Fan box (2) Power switch for the fan box

Procedure





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Step 2 Set the circuit breaker labeled SW9 on the direct current distribution unit-11C (DCDU-11C) toOFF.

Step 3 Remove the faulty fan.1. Record the connections of the cables on the panel of the fan box, and then disconnect the

cables.

NOTE

When disconnecting the RJ45 connector from the CMUE, hold the connector with a hand by using thevacant trough in the upper baffle plate, as shown in Figure 5-124.

Figure 5-124 Plan view of the fan box

2. Use a Phillips screwdriver to remove the four screws on the mounting ears of the fan box,

and then gently pull the box out, as shown in Figure 5-125.

DANGERWhen removing the fan box, do not touch the air inlet at the bottom of the fan box.



5-109



Step 5 Install a new fan box.

1. Slide the new fan box into the original position slowly, and then tighten the captive screwson the mounting ears of the fan box.

2. Connect the cables that were disconnected from the removed fan box to the ports on thenew fan box.

NOTE

Link the DB50 connector on the environment monitoring signal cable perpendicularly to the HPMIpanel using both hands to prevent false monitoring alarms caused by bent pins.

Step 6 Set the circuit breaker labeled SW9 on the DCDU-11C to ON.



----End








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5.8.3 Replacing the Fan in the Front DoorIf the fan in the front door of the TMC11H cabinet is faulty and cannot be repaired in time, youmust replace it.


Phillips screwdrivers, wire clippers, a socket wrench, and an ESD box or bag, are ready.l The model of the component to be replaced is confirmed by referring to 5.1.2 Querying


to be replaced.

Contextl Figure 5-126 shows the position of the fan in the front door of the TMC11H cabinet.l It takes about 20 minutes to replace the fan.

Figure 5-126 Position of the fan in the front door

(1) Fan in the front door (2) Power switch for the fan in the front door

Procedure





5-111

Step 2 Set the circuit breaker labeled SW9 on the direct current distribution unit-11C (DCDU-11C) toOFF.


1. Record the connection of the cable for the faulty fan on the fan power transfer plate,disconnect the cable, and remove the rubber plug from the cable hole, as shown in Figure5-127.

Figure 5-127 Removing the fan cable

2. Use a Phillips screwdriver to remove the five screws from the air duct, use a socketscrewdriver to remove the nut from under the air duct, and then remove the air duct, asshown in Figure 5-128.

Figure 5-128 Removing the air duct




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3. Use a Phillips screwdriver to remove the 10 screws from the heat exchanger, and then

remove the heat exchanger from the front door, as shown in Figure 5-129.

Figure 5-129 Removing the heat exchanger

4. Use a Phillips screwdriver to remove the five screws from the cover plate for the fan cavity,

and remove the cover plate, as shown in Figure 5-130.



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Figure 5-130 Removing the cover plate for the fan cavity

5. Use a Phillips screwdriver to remove the four screws that are used to secure the fan, and

remove the faulty fan, as shown in Figure 5-131.




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1. Install the new fan in the fan cavity, and then tighten the four screws on the fan.

2. Reinstall the cover plate of the fan cavity on the heat exchanger, and then tighten the fivescrews on the cover plate of the fan cavity.

3. Lead the cable for the new fan through the cable outlet on the right of the front door, andthen install a rubber cap on the cable outlet.

4. Install the heat exchanger in the front door, and then tighten the 10 screws on the panel ofthe heat exchanger.

5. Reinstall the air duct on the heat exchanger, and then tighten the five screws and one nut.

6. Reinstall the cable for the new fan on the fan transfer board based on the cable connectionsrecorded.

Step 6 Set the circuit breaker labeled SW9 on the DCDU-11C to ON.



----End



5-115



5.8.4 Replacing the AC HAUIf the AC heater assembly unit (HAU) in the TMC11H cabinet is faulty and cannot be repairedin time, you must replace it.




to be replaced.

Contextl The HAU can be installed in a 1 U transmission space based on actual configurations, as


WARNINGAfter the installation, do not change the position of the heater during the routine operation.

l It takes about 5 minutes to replace the HAU.




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Figure 5-132 Position of the HAU in the TMC11H cabinet

(1) HAU (2) Power switch for the HAU

Procedure



Step 2 Set the power switch for the HAU to OFF. Figure 5-132 shows the position of the power switch.

Step 3 Remove the faulty HAU, as shown in Figure 5-133.

1. Unplug the power plug on the HAU.

2. Use a Phillips screwdriver to remove the four captive screws on the HAU panel, and thengently pull the HAU out.



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Figure 5-133 Removing the HAU

Step 4 Place the HAU into the ESD box or bag.

Step 5 Install a new HAU, as shown in Figure 5-134.1. Place the new HAU in the original position, and gently slide the HAU into the cabinet.2. Use a Phillips screwdriver to tighten the four captive screws on the HAU panel.3. Connect the power plug to the power supply socket on the HAU.

Figure 5-134 Installing the HAU

Step 6 Set the power switch that was set to OFF in Step 2 to ON.


----End







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Procedure



Step 2 Remove the faulty ELU.

1. Disconnect the cable from the RJ45 port on the top of the ELU housing.

2. Slide the ELU housing upwards to remove it according to the arrow direction, as shown inFigure 5-136.



5-119


3. Use a Phillips screwdriver to remove the two M4×8 screw assemblies from the ELU, asshown in Figure 5-137.







----End








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BTS3900A (Ver.C) Site Maintenance Guide (02)(PDF)-En

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