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BTS3900 WCDMA
Site Maintenance Guide
Issue 04
Date 2009-03-30
Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
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Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. For any
assistance, please contact our local office or company headquarters.
Huawei Technologies Co., Ltd.
Address: Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
People's Republic of China
Website: http://www.huawei.com
Email: [email protected]
Copyright Huawei Technologies Co., Ltd. 2009. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior written
consent of Huawei Technologies Co., Ltd.
Trademarks and Permissions
and other Huawei trademarks are the property of Huawei Technologies Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective holders.
Notice
The information in this document is subject to change without notice. Every effort has been made in the
preparation of this document to ensure accuracy of the contents, but the statements, information, and
recommendations in this document do not constitute a warranty of any kind, express or implied.
Huawei Proprietary and Confidential
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Contents
About This Document.....................................................................................................................1
1 Changes in the BTS3900 WCDMA Site Maintenance Guide............................................1-1
2 Preparations for NodeB Site Maintenance............................................................................2-1
3 Hardware Items of BTS3900 Routine Maintenance............................................................3-1
3.1 Maintaining Items of the Equipment Room Environment of the NodeB.......................................................3-2
3.2 Power Supply and Grounding System Maintenance Items of the NodeB......................................................3-3
3.3 Maintenance of the Main Components in the BTS3900 ................................................................................3-4
4 Powering On/Off the BTS3900................................................................................................4-1
4.1 Powering On the BTS3900.............................................................................................................................4-2
4.2 Powering Off the BTS3900.............................................................................................................................4-4
5 Replacing Components of the BTS3900.................................................................................5-1
5.1 Replacing a BBU3900 Case............................................................................................................................5-3
5.2 Replacing a Board or Module of the BBU3900..............................................................................................5-4
5.3 Replacing a DCDU-01 Module.......................................................................................................................5-5
5.4 Replacing the FAN Unit..................................................................................................................................5-7
5.5 Replacing the PMU.......................................................................................................................................5-10
5.6 Replacing a PSU............................................................................................................................................5-11
5.7 Replacing an SLPU.......................................................................................................................................5-13
5.8 Replacing a WRFU Module..........................................................................................................................5-13
5.9 Replacing the Power Supply Subrack of the BTS3900.................................................................................5-16
6 Maintaining the PS4890............................................................................................................6-16.1 Replacing the PMU.........................................................................................................................................6-2
6.2 Replacing a PSU..............................................................................................................................................6-3
6.3 Replacing the DCDU-04.................................................................................................................................6-5
6.4 Replacing the DCDU-03.................................................................................................................................6-6
BTS3900 WCDMA
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Figures
Figure 4-1 DCDU-01 panel..................................................................................................................................4-2
Figure 4-2 DCDU-01 panel..................................................................................................................................4-4
Figure 5-1 Removing the protection cover...........................................................................................................5-6
Figure 5-2 Removing the screws on the two mounting ears of the module.........................................................5-6
Figure 5-3 Position of the FAN unit switch.........................................................................................................5-8
Figure 5-4 Raising the adjustable cable trough ...................................................................................................5-8
Figure 5-5 Removing the FAN unit.....................................................................................................................5-9
Figure 5-6 Removing the PMU..........................................................................................................................5-10
Figure 5-7 Installing the PMU............................................................................................................................5-11
Figure 5-8 Removing the PSU...........................................................................................................................5-12
Figure 5-9 Installing the PSU.............................................................................................................................5-12
Figure 5-10 Position of the RFU........................................................................................................................5-14
Figure 5-11 Removing the RFU.........................................................................................................................5-15
Figure 5-12 Removing the PMU/PSU................................................................................................................5-17Figure 5-13 Removing the screws from the mounting ears...............................................................................5-18
Figure 6-1 Removing the PMU............................................................................................................................6-2
Figure 6-2 Installing the PMU..............................................................................................................................6-3
Figure 6-3 Removing the PSU.............................................................................................................................6-4
Figure 6-4 Installing the PSU...............................................................................................................................6-4
BTS3900 WCDMA
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Tables
Table 3-1 Maintenance items of the equipment room environment of the ..........................................................3-2
Table 3-2 Maintenance items of the power supply and grounding system of the ...............................................3-3
Table 3-3 Maintenance items of the main components in the BTS3900..............................................................3-4
Table 4-1 Power switches on the DCDU-01 panel...............................................................................................4-2
Table 4-2 Checklist for power supply to the components in the cabinet..............................................................4-3
Table 4-3 Power switches on the DCDU-01 panel...............................................................................................4-4
BTS3900 WCDMA
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About This Document
This document describes the routine hardware maintenance items of the BTS3900, such as
maintenance items concerning the cabinet, power supply and grounding system, and equipment
room. The document also provides guidelines for replacing the components and boards of the
BTS3900.
Product Version
The following table lists the product version related to this document.
Product Name Product Version
BTS3900 WCDMA (hereinafter referred to
as BTS3900)
V200R010
V200R011
Intended AudienceThis document is intended for:
l System engineers
l Site maintainers
Change History
For changes in the document, refer to 1 Changes in the BTS3900 WCDMA Site Maintenance
Guide.
Organization
1 Changes in the BTS3900 WCDMA Site Maintenance Guide
This describes the changes in theBTS3900 WCDMA Site Maintenance Guide.
2 Preparations for NodeB Site Maintenance
This describes the preparations for site maintenance. The preparations for site maintenance
involve obtaining site information, selecting maintenance items, and arranging maintenance
tools and spare parts.
3 Hardware Items of BTS3900 Routine Maintenance
BTS3900 WCDMA
Site Maintenance Guide About This Document
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This describes the routine maintenance for the hardware items in the BTS3900. The hardware
items that are routinely maintained refer to the equipment room environment of the , power
supply and grounding system of the , and main components in the BTS3900.
4 Powering On/Off the BTS3900
When maintaining the BTS3900, you need to power on or power off the BTS3900. You must
power on the BTS3900 according to the specific procedure and requirements, and you can power
off the BTS3900 in a normal situation or in an emergency.
5 Replacing Components of the BTS3900
This describes how to replace the faulty BTS3900 components. The faulty components must be
replaced in time. The replaceable components in the BTS3900 are the BBU3900 case,
BBU3900 board or module, DCDU-01, FAN module, PMU/PSU, SLPU, WRFU, and
BTS3900 power subrack.
6 Maintaining the PS4890
The hardware maintenance of the PS4890 covers the PMU, PSU, DCDU-04, and DCDU-03.
Conventions
Symbol Conventions
The symbols that may be found in this document are defined as follows.
Symbol Description
Indicates a hazard with a high level of risk, which if not
avoided,will result in death or serious injury.
Indicates a hazard with a medium or low level of risk, which
if not avoided, could result in minor or moderate injury.
Indicates a potentially hazardous situation, which if not
avoided,could result in equipment damage, data loss,
performance degradation, or unexpected results.
Indicates a tip that may help you solve a problem or save
time.
Provides additional information to emphasize or supplementimportant points of the main text.
General Conventions
The general conventions that may be found in this document are defined as follows.
Convention Description
Times New Roman Normal paragraphs are in Times New Roman.
Boldface Names of files, directories, folders, and users are in
boldface. For example, log in as userroot.
About This Document
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Convention Description
Italic Book titles are in italics.
Courier New Examples of information displayed on the screen are in
Courier New.
Command Conventions
The command conventions that may be found in this document are defined as follows.
Convention Description
Boldface The keywords of a command line are in boldface.
Italic Command arguments are in italics.
[ ] Items (keywords or arguments) in brackets [ ] are optional.
{ x | y | ... } Optional items are grouped in braces and separated by
vertical bars. One item is selected.
[ x | y | ... ] Optional items are grouped in brackets and separated by
vertical bars. One item is selected or no item is selected.
{ x | y | ... }* Optional items are grouped in braces and separated by
vertical bars. A minimum of one item or a maximum of all
items can be selected.
[ x | y | ... ]* Optional items are grouped in brackets and separated by
vertical bars. Several items or no item can be selected.
GUI Conventions
The GUI conventions that may be found in this document are defined as follows.
Convention Description
Boldface Buttons, menus, parameters, tabs, window, and dialog titles
are in boldface. For example, clickOK.
> Multi-level menus are in boldface and separated by the ">"signs. For example, choose File > Create > Folder .
Keyboard Operations
The keyboard operations that may be found in this document are defined as follows.
Format Description
Key Press the key. For example, press Enter and press Tab.
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Format Description
Key 1+Key 2 Press the keys concurrently. For example, pressing Ctrl+Alt
+A means the three keys should be pressed concurrently.
Key 1, Key 2 Press the keys in turn. For example, pressing Alt, A meansthe two keys should be pressed in turn.
Mouse Operations
The mouse operations that may be found in this document are defined as follows.
Action Description
Click Select and release the primary mouse button without moving
the pointer.
Double-click Press the primary mouse button twice continuously and
quickly without moving the pointer.
Drag Press and hold the primary mouse button and move the
pointer to a certain position.
About This Document
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1 Changes in the BTS3900 WCDMA SiteMaintenance Guide
This describes the changes in theBTS3900 WCDMA Site Maintenance Guide.
01 (2008-03-30)
This is the initial field trial release.
BTS3900 WCDMA
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2 Preparations for NodeB Site MaintenanceThis describes the preparations for site maintenance. The preparations for site maintenance
involve obtaining site information, selecting maintenance items, and arranging maintenance
tools and spare parts.
Obtaining Site Information
Before you maintain the site, obtain the following information:
l Unsolved faults and alarms
l Hardware configurations
l Local environment
l Spare parts
Selecting Maintenance Items
Select suitable maintenance items based on actual requirements of the . The maintenance items
are as follows:
l Maintaining the equipment room environment of the
l Maintaining power supply and grounding system of the
l Maintaining the main components in the
l Maintaining the antenna system of the
Arranging Tools and Spare Parts
Arrange the related maintenance tools and spare parts based on the site information and
maintenance items of the .
The most commonly used tools for site maintenance are as follows:
l The frequency test devices, which involve a frequency generator, a spectrum analyzer, and
various connectors and cables.
l
Power test devices used to test and analyze the output power of the . A commonly usedpower test device, namely, a power meter.
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l The antenna and feeder test devices used to test the standing wave ratio, return loss, and
cable insertion loss, and to locate faults. The commonly used antenna and feeder test device
is the SiteMaster.
l Other devices
Multimeter
Diagnosis tools for maintenance and test/test devices for robustness of the
Local Maintenance Terminal (LMT)
Rubidium clock (used to locate the clock of the )
Spare parts
NOTE
When some parts are faulty and thus need to be replaced, arrange related tools and new parts for
replacement.
2 Preparations for NodeB Site Maintenance
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3Hardware Items of BTS3900 RoutineMaintenance
About This Chapter
This describes the routine maintenance for the hardware items in the BTS3900. The hardware
items that are routinely maintained refer to the equipment room environment of the , power
supply and grounding system of the , and main components in the BTS3900.
3.1 Maintaining Items of the Equipment Room Environment of the NodeB
This provides the maintenance items, maintenance intervals, operation instructions, and
reference standards of the equipment room environment.
3.2 Power Supply and Grounding System Maintenance Items of the NodeB
This provides the maintenance items, maintenance intervals, operation instructions, and
reference standards of the power supply and grounding system.
3.3 Maintenance of the Main Components in the BTS3900
This describes the maintenance items, maintenance interval, operating instruction, and reference
standard of the main components in the BTS3900.
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3.1 Maintaining Items of the Equipment RoomEnvironment of the NodeB
This provides the maintenance items, maintenance intervals, operation instructions, and
reference standards of the equipment room environment.
Table 3-1 describes how to maintain the equipment room environment.
Table 3-1 Maintenance items of the equipment room environment of the
Item Interval Operating Instruction Reference Standard
Checking
environmental
alarms
Daily Check whether power
supply alarms, fire alarms,
or smoke alarms arereported.
No power supply alarms,
fire alarms, or smoke
alarms are reported.
Checking the
temperature in
the equipment
room
Weekly Record the temperature read
on the thermometer in the
equipment room.
-20 to +50
Checking the
temperature in
the equipment
room
Weekly Record the humidity read on
the hygrometer in the
equipment room.
5% to 85%
Checking theillumination in
the equipment
room
Every twomonths
Check whether the routineand emergency illumination
in the equipment room is
normal.
-
Checking the air
conditioner
Every two
months
Check whether the air
conditioner is working
normally.
-
Checking
protective
devices
Every two
months
Check whether anti-disaster
devices, equipment
protection devices, and fire-
protection devices are in
good condition.
l The foam extinguisher or
dry powder fire
extinguisher is installed
in the equipment room.
In addition, the pressure
and period of validity of
the extinguisher meet the
requirement.
l There is no danger of
damage to the equipment
by rats or insects.
3 Hardware Items of BTS3900 Routine Maintenance
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Item Interval Operating Instruction Reference Standard
Cleaning the
equipment
room
Every two
months
Check whether cabinets,
equipment housing,
equipment interior, tables,
floor, doors, and windows
are clean.
All the items to be checked
are clean.
3.2 Power Supply and Grounding System MaintenanceItems of the NodeB
This provides the maintenance items, maintenance intervals, operation instructions, and
reference standards of the power supply and grounding system.
Table 3-2 lists the routine maintenance items for the power supply and the grounding system
of the .
Table 3-2 Maintenance items of the power supply and grounding system of the
Item Interval Operating Instruction
Reference Standard
Checking power
cables
Monthly Check the connections
of power cables
carefully.
The power cables are not
aging, and there is no
corrosion on the
connection points.
Checking thevoltage
Monthly Measure the voltage of the power supply by
using a multimeter.
The voltage is withinstandard range.
Checking PGND
cables
Monthly Check whether the
PGND cable and
grounding bar are
connected properly.
The connections of the
PGND cable are sound. It
is not aging. The
connection points are
sound with no corrosion
on them.
Earth resistance Monthly Measure the earth
resistance by using an
electric earth resistance
tester and keep a record.
The grounding resistance
of the cabinet is smaller
than 10 ohms.
Checking the
storage batteries
Yearly Check the storage
batteries and rectifiers
every year.
The battery capacity is
within the normal range
and the batteries are
correctly connected. The
performance parameters
of rectifiers are normal.
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3.3 Maintenance of the Main Components in the BTS3900
This describes the maintenance items, maintenance interval, operating instruction, and reference
standard of the main components in the BTS3900.
Table 3-3 describes the maintenance items of the main components in the BTS3900.
Table 3-3 Maintenance items of the main components in the BTS3900
Item Interval Operating Instruction Reference Standard
Checking the
fans
Monthly Check whether the fans are
operational.
The fans work properly
without exceptional
sounds generated by
frictions between the
blades of the fan and the
subrack.
Checking the
air filter
Quarterly If there is too much dust on the
air filter, clean the air filter.
-
Checking the
exterior of the
cabinet
Quarterly Check whether there are dents,
cracks, holes, or corrosion on
the surface of the cabinet and
whether the cabinet label is
legible.
-
Checking thelock and door
of the cabinet
Quarterly Check whether the lock isnormal and the door can be
opened and closed easily.
-
Checking the
cleanness of
the cabinet
Quarterly Check whether the cabinet is
clean.
The cabinet surface is
clean. The subracks are
not dusty.
Checking the
fan box
Annually If there is too much dust on the
surface of or inside the fan box,
clean the fan box.
-
Checking
LEDs on theboards
Monthly Check whether the LEDs on the
boards are normal.
For details about the
status of LEDs, see thehardware description
about the corresponding
boards.
Checking the
ESD wrist
strap
Quarterly Use either of the following
methods:
l Use an ESD wrist strap tester
to test the ESD wrist strap.
l Use a multimeter to test the
earth resistance of the ESD
wrist strap.
l If you are using an
ESD wrist strap tester,
the LED GOOD is on.
l If you are using a
multimeter, the earth
resistance is between
0.75 megohm and 10
megohms.
3 Hardware Items of BTS3900 Routine Maintenance
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4 Powering On/Off the BTS3900About This Chapter
When maintaining the BTS3900, you need to power on or power off the BTS3900. You must
power on the BTS3900 according to the specific procedure and requirements, and you can power
off the BTS3900 in a normal situation or in an emergency.
4.1 Powering On the BTS3900
This describes how to power on the BTS3900.
4.2 Powering Off the BTS3900
This describes how to power off the BTS3900 in a normal situation and in an emergency. You
must power off the BTS3900 in a normal situation such as moving the equipment or anticipating
a territorial blackout. You must also power off the BTS3900 in an emergency such as a fire,
smoke, or water immersion occurs in the equipment room.
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4.1 Powering On the BTS3900
This describes how to power on the BTS3900.
Prerequisite
l The power switches on the DCDU-01 of the BTS3900 are all set to OFF.
l The power supply to the BTS3900 is cut off.
l The components to be replaced in the BTS3900 are replaced.
Context
Figure 4-1 shows the power switches on the DCDU-01 panel.
Figure 4-1 DCDU-01 panel
Table 4-1 lists the power switches on the DCDU-01 panel.
Table 4-1 Power switches on the DCDU-01 panel
Module Power Switch
SPARE2
BBU BBU
Standby BBU SPARE1
FAN FAN
RFU in slot 0 RFU0
RFU in slot 1 RFU1
RFU in slot 2 RFU2
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Module Power Switch
RFU in slot 3 RFU3
RFU in slot 4 RFU4
RFU in slot 5 RFU5
NOTE
The RFUs are in slots 0 to 5 from left to right.
Procedure
Step 1 Set the main power switch of the BTS3900 to ON.
Step 2 Set the DC power switch labeled FAN on the DCDU-01 panel to ON.
Step 3 Set the DC power switch labeled BBU on the DCDU-01 panel to ON.
NOTE
If a standby BBU is configured, set the DC power distribution switch labeled SPARE1 on the DCDU-01
panel to ON so that the standby BBU is powered on.
Step 4 Set the DC power switches labeled RFU0 to RFU5 on the DCDU-01 panel to ON.
----End
PostrequisiteAfter the components are powered on, you must check whether the power supply to the
components are normal according to Table 4-2.
Table 4-2 Checklist for power supply to the components in the cabinet
Component LED Status
FAN RUN LED is green and blinks every other second.
BBU
WMPT RUN LED is steady green or blinks every other
second.
UBFA STATE LED is green and blinks every other second.
UPEU RUN LED is steady green.
UPEB RUN LED is steady green.
UTRP RUN LED is steady green or blinks every other
second.
WBBP RUN LED is steady green or blinks every other
second.
RFU0 to RFU5 RUN LED is green and blinks every other second.
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Component LED Status
PMU STATE LED is green and blinks every other second
or blinks every other 0.125 second.
PSU Power input LED is steady green.
NOTE
l If the RUN LED of the WMPT, UTRP, or WBBP board is steady green, you can infer that the power
supply to the board is normal, but the board is faulty.
l If the RUN LED of the PMU is green and blinks every other 0.125 second, you can infer that the PMU
works properly, but the communication with the RNC fails.
4.2 Powering Off the BTS3900
This describes how to power off the BTS3900 in a normal situation and in an emergency. You
must power off the BTS3900 in a normal situation such as moving the equipment or anticipating
a territorial blackout. You must also power off the BTS3900 in an emergency such as a fire,
smoke, or water immersion occurs in the equipment room.
Context
Figure 4-2 shows the power switches on the DCDU-01 panel.
Figure 4-2 DCDU-01 panel
Table 4-3 lists the power switches on the DCDU-01 panel.
Table 4-3 Power switches on the DCDU-01 panel
Module Power Switch
SPARE2
BBU BBU
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Module Power Switch
Standby BBU SPARE1
FAN FAN
RFU in slot 0 RFU0
RFU in slot 1 RFU1
RFU in slot 2 RFU2
RFU in slot 3 RFU3
RFU in slot 4 RFU4
RFU in slot 5 RFU5
NOTE
The RFUs are in slots 0 to 5 from left to right.
Procedure
l Power off the BTS3900 in a normal situation.
1. Set the DC power distribution switches labeled RFU0 to RFU5 on the DCDU-01 to
OFF.
2. Set the DC power distribution switch labeled BBU on the DCDU-01 to OFF.
3. Set the DC power distribution switch labeled FAN on the DCDU-01 to OFF.
4. Set the DC power distribution switches labeled SPARE1 and SPARE2 on theDCDU-01 to OFF.
5. Set the main power switch to OFF.
l Power off the BTS3900 in an emergency.
CAUTION
Powering off the BTS3900 in an emergency may damage the equipment or boards. Do not
use this method in any situation other than in an emergency.
1. Set the main power switch to OFF.
2. Set all the DC power distribution switches on the DCDU-01 to OFF if time permits.
----End
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5 Replacing Components of the BTS3900About This Chapter
This describes how to replace the faulty BTS3900 components. The faulty components must be
replaced in time. The replaceable components in the BTS3900 are the BBU3900 case,
BBU3900 board or module, DCDU-01, FAN module, PMU/PSU, SLPU, WRFU, and
BTS3900 power subrack.
5.1 Replacing a BBU3900 Case
This describes how to replace a BBU3900 case. The BBU3900, which is a core module of the
NodeB, processes baseband signals of the entire NodeB system and provides transport interfaces
for communication with other NEs, namely, RNC, RRU, WRFU. Replacing the BBU3900interrupts all the services carried by the NodeB.
5.2 Replacing a Board or Module of the BBU3900
This describes how to replace a board or module of the BBU3900. All transmission ports of the
BBU3900 are on the boards and module. Replacing a board or module may disrupt all the
services carried by the NodeB.
5.3 Replacing a DCDU-01 Module
The DCDU-01, installed under the BBU, supplies DC power for the cabinet and has the function
of surge protection. Replacing the DCDU-01 disrupts the services carried on the corresponding
cabinet. It takes about 20 minutes to replace the DCDU-01.
5.4 Replacing the FAN UnitThe FAN unit works with the air inlet box in the cabinet to form a ventilation path. The FAN
unit provides forced ventilation and dissipation for the BBU and RFU. Replacing the FAN unit
may result in over-temperature alarms due to interruption of heat dissipation for the cabinet but
has no negative effect on services of the BTS. It takes about 20 minutes to replace a FAN unit.
5.5 Replacing the PMU
When the PMU is faulty and cannot be repaired in time, you must replace it.
5.6 Replacing a PSU
When a PSU is faulty and cannot be repaired in time, you must replace it.
5.7 Replacing an SLPU
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This describes how to replace an SLPU. The SLPU is positioned above the BBU and used for
surge protection of the NodeB. Replacing the SLPU interrupts the services carried by the NodeB.
It takes about 10 minutes to replace an SLPU module.
5.8 Replacing a WRFU Module
This describes how to replace WRFU. The WRFU is located on the top of the BTS3900 cabinet.The WRFU provides the following functions: modulation and demodulation of baseband or RF
signals, data processing, and signal combination and division. The replacement of the WRFU
disrupts the services carried on it. It takes about 10 minutes to replace a RFU module.
5.9 Replacing the Power Supply Subrack of the BTS3900
The power supply subrack is located in the lower cabinet of the BTS3900. It can be installed
with the PSU and PMU to provide the power input and output ports. It takes about 25 minutes
to replace the power supply subrack.
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5.1 Replacing a BBU3900 Case
This describes how to replace a BBU3900 case. The BBU3900, which is a core module of the
NodeB, processes baseband signals of the entire NodeB system and provides transport interfaces
for communication with other NEs, namely, RNC, RRU, WRFU. Replacing the BBU3900
interrupts all the services carried by the NodeB.
Prerequisite
The tools and materials, such as the ESD wrist strap or gloves, cross screwdriver, ESD box or
bag, and key to the cabinet door are ready.
Procedure
Step 1 Run ULD CFGFILE on the LMT to upload the NodeB data configuration file to the LMTmaintenance computer.
Step 2 Power off the BBU3900 by referring to Powering Off the BBU3900, and turn off the powerswitch of the external power supply to the BBU3900.
Step 3 Label the BBU3900 cables, disconnect them, and then take insulation measures for the cables.
NOTE
Disconnect the BBU3900 cables in the sequence of the power cable, alarm cable, FE cable, E1 cable, CPRI
optical cable, and PGND cable.
Step 4 Use the cross screwdriver to remove the four panel screws.
Step 5 Pull the faulty BBU3900 case out of the cabinet.Step 6 Insert a new BBU3900 case into the slot. Then, push the new BBU3900 case until it is in position.
Step 7 Tighten the panel screws to secure the new BBU3900 case.
Step 8 Connect the cables to the BBU in turn according to the labels.
Step 9 Turn on the power switch of the external power supply to the BBU3900. Then, power on theBBU3900 by referring to Powering on the BBU3900.
Step 10 On the LMT, run the DLD CFGFILE command to download the NodeB data configuration fileto the new BBU3900.
Step 11 Run LST VERto query the software version and the BootROM version. If it is not correct,update the version.
Step 12 Run RST NODEB to restart the NodeB.
----End
Postrequisite
After replacing the faulty BBU3900 case, check the following items:
l On the M2000 or LMT, the related alarms are cleared.
l A UE can access the cell carried by the BBU3900.
Contact the local Huawei office to handle the faulty BBU3900 case.
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5.2 Replacing a Board or Module of the BBU3900
This describes how to replace a board or module of the BBU3900. All transmission ports of the
BBU3900 are on the boards and module. Replacing a board or module may disrupt all the
services carried by the NodeB.
Prerequisite
The tools and materials, such as the ESD wrist strap or gloves, cross screwdriver, ESD box or
bag, and key to the cabinet door are ready.
Procedure
Step 1 On the LMT, run the BLK BRD command to block the faulty board.
Step 2 Remove the faulty board or module.
1. Record the connections of the cables on the faulty board or module. Then, disconnect the
cables.
2. Loosen the screws on both sides of the faulty board or module.
3. If the ejector lever is configured, turn outwards the ejector lever and then pull the faulty
board or module out of the slot. If no ejector lever is configured, pull out the board or
module directly.
4. Place the faulty board or module in an ESD bag.
Step 3 Install a new board or module.
1. Insert a new board or module into the slot. Then, push the board or module until it is inposition.
2. Turn inwards the ejector lever and then tighten the screws on both sides of the new board
or module.
3. If necessary, connect the cables to the new board or module based on the recorded
connections.
Step 4 Check whether the board or module is operational.
l When the board is operational, the RUN LED blinks at 0.5 Hz and the ALM LED is OFF.
When the module is operational, the STATE LED blinks at 0.5 Hz.
l If the board works in active/standby mode, the ACT LED is ON when the board is in active
mode. The ACT LED is OFF when the board is in standby mode.
NOTE
For details of the LEDs on the boards and module, refer to the hardware description of the BBU3900.
Step 5 Check whether alarms are reported.
1. On the LMT or M2000 client, run the LST ALMAF command to view active alarms.
2. If active alarms are reported, clear them according to troubleshooting suggestions. If no
active alarm is reported, go to Step 6.
Step 6 Activate the BootROM or software version of the board or module.
1. Run the DSP BRDVERcommand to check whether the BootROM or software version iscorrect.
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2. If the BootROM or software version is wrong, run the ACT SOFTWARE command to
activate the BootROM or software version of the board or module.
Step 7 On the LMT, run the UBL BRD command to unblock the board.
----End
Postrequisite
Contact the local Huawei office to handle the faulty board or module.
5.3 Replacing a DCDU-01 Module
The DCDU-01, installed under the BBU, supplies DC power for the cabinet and has the function
of surge protection. Replacing the DCDU-01 disrupts the services carried on the corresponding
cabinet. It takes about 20 minutes to replace the DCDU-01.
Prerequisite
l The model of the faulty DCDU-01 is confirmed and the new DCDU-01 of the same model
is available.
l The new DCDU-01 module is intact, and the hardware version of the new DCDU-01 is
consistent with that of the faulty DCDU-01.
l The tools and materials, such as an ESD wrist strap or a pair of ESD gloves, a Phillips
screwdriver, an ESD box or bag, and the key to the cabinet door, are available.
Context
CAUTION
Take proper ESD protection measures, for example, wear an ESD wrist strap or a pair of ESD
gloves, to prevent electrostatic damage to the boards, modules, or electronic components.
Procedure
Step 1 Power off the BTS3900.
Step 2 Mark the cables connected to the output ports on the DCDU-01, and then disconnect them.
Step 3 Use the Phillips screwdriver to remove the protection cover from the external power input wiringterminal block of the DCDU-01, as shown in Figure 5-1.
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Figure 5-1 Removing the protection cover
(1) Protection cover (2) Screw (3) External input power cable
Step 4 Mark the external input power cable for the DCDU-01, and then disconnect the cable.
Step 5 Remove the four M6x12 strews on the two mounting ears of the DCDU-01, as shown in Figure
5-2.
Figure 5-2 Removing the screws on the two mounting ears of the module
Step 6 Remove the DCDU-01 module by pulling out the DCDU-01 with one hand, and holding theDCDU-01 with the other hand.
Step 7 Put the faulty DCDU-01 into an ESD box.
Step 8 Install the new DCDU-01 into the position where the original one is located, and then use thefour removed M6x12 screws to fasten the DCDU-01 to the subrack.
Step 9 Insert the OT terminal of the power cable into the corresponding cable hole in the wiring terminal
block. Connect the OT terminal of the -48 V power cable (blue) to the terminal labeled NEG(-),and then connect the OT terminal of the GND cable (black) to the terminal labeled RTN(+).
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Step 10 Place the protection cover on the DCDU-01, and then tighten the screw on the protection coverby using the Phillips screwdriver.
Step 11 Remove the rubber covers from the DCDU-01 power sockets on the new DCDU-01 panel.
Step 12 Connect the removed cables to the power output ports on the DCDU-01 panel according to themarks.
Step 13 Power on the BTS3900.
----End
Postrequisite
After replacing the DCDU-01, perform the following operations:
l Check that the cable connections are correct and secure.
l
Ensure that the related alarms are cleared on the M2000 or LMT after the equipment ispowered on.
l Contact the local Huawei office to handle the faulty DCDU-01 module.
5.4 Replacing the FAN Unit
The FAN unit works with the air inlet box in the cabinet to form a ventilation path. The FAN
unit provides forced ventilation and dissipation for the BBU and RFU. Replacing the FAN unit
may result in over-temperature alarms due to interruption of heat dissipation for the cabinet but
has no negative effect on services of the BTS. It takes about 20 minutes to replace a FAN unit.
Prerequisite
l A new FAN unit is ready.
l Ensure that the new FAN unit is in good condition and the version of the new FAN unit is
consistent with that of the faulty FAN unit.
l The required tools and materials, such as ESD wrist strap, Phillips screwdriver, ESD box
or bag, and the key to the cabinet door, are available.
Context
CAUTION
Take proper ESD prevention measures, for example, wear an ESD wrist strap or gloves to prevent
the boards, modules, and electronic components from being damaged by the static electricity
generated by human body.
Procedure
Step 1 Set the DC distribution switch FAN labeled on the DCDU-01 to OFF. Figure 5-3 shows theposition of the FAN unit switch on the DCDU-01.
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Figure 5-3 Position of the FAN unit switch
Step 2 Label the cables on the panel of the FAN unit and then remove the cables.
Step 3 Loosen the captive screws on both sides of the adjustable cable trough. Then, raise the cabletrough and fix it at the upper mounting hole, as shown in Figure 5-4.
Figure 5-4 Raising the adjustable cable trough
(1) Upper mounting hole (2) Captive screw
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Step 4 Remove the four screws from the fan subrack, as shown in Figure 5-5.
Figure 5-5 Removing the FAN unit
Step 5 Pull out the fan subrack by one-third of its length with one hand, hold the fan subrack with theother hand, and then pull the entire fan subrack out of the cabinet.
Step 6 Put the new FAN unit into the fan subrack. Then, secure the four screws on the fan subrack.
Step 7 Place the adjustable cable trough to its original position, and then tighten the captive screws onboth sides of the adjustable cable trough.
Step 8 Install the cables to the panel of the FAN unit based on the labels.
Step 9 Set the FAN unit switch on the DCDU-01 to ON.
----End
Postrequisite
After replacing the FAN unit, perform the following operations:
l Check the cables and ensure that they are correctly and tightly connected.
l Ensure the RUN LED on the panel is green and blinks at 0.5 Hz when the equipment is
powered on.
l Ensure that the related alarms are cleared after the equipment is powered on.
l
Contact the local Huawei office to dispose of the faulty FAN unit.
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5.5 Replacing the PMU
When the PMU is faulty and cannot be repaired in time, you must replace it.
Prerequisite
l The type of faulty PMU is confirmed and the new PMU is ready.
l The new PMU is intact and its version is consistent with the version of the faulty PMU.
l The tools and materials are ready. The tools and materials are the ESD wrist strap or gloves,
cross screwdriver, ESD box or bag, and key to the cabinet door.
Context
CAUTION
Take proper ESD prevention measures, for example, wearing an ESD wrist strap or a pair of
ESD gloves, to protect the PMU from electrostatic damage.
Procedure
Step 1 Disconnect the cables from the panel of the PMU, and then label the cables.
CAUTION
When inserting or removing the DB50 connector of the environment monitoring signal cable,
you must hold the connector with both hands and keep it perpendicular to the panel, to prevent
false alarms caused by bent pins.
Step 2 Loosen the screws on the handle of the PMU panel by using a flathead screwdriver.
Step 3 Pull the handle gently to disconnect the buckle of the PMU from the subrack, and then removethe PMU from the slot, as shown in Figure 5-6.
Figure 5-6 Removing the PMU
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Step 4 Set the DIP switch of the new PMU to 11000000.
Step 5 Place the new PMU in the corresponding slot and loosen the screws on the handle of the PMU.Then, pull the handle outwards.
Step 6 Slide the PMU along the guide rails into the slot and then push the handle back.
Step 7 Tighten the screws on the handle, as shown in Figure 5-7.
Figure 5-7 Installing the PMU
Step 8 Connect the cables, which have been disconnected from the PMU.
----End
Postrequisite
After replacing the PMU, check the following items:
l The cables are correctly and tightly connected.
l The RUN LED on the panel blinks green at 0.5 Hz after the PMU is powered on.
l On the M2000 or LMT, the related alarms are cleared.
l Contact the local Huawei office to handle the faulty PMU.
5.6 Replacing a PSU
When a PSU is faulty and cannot be repaired in time, you must replace it.
Prerequisite
l The type of faulty PSU is confirmed and the new PSU is ready.
l The new PSU is intact and its version is consistent with the version of the faulty PSU.
l The tools and materials are ready. The tools and materials are the ESD wrist strap or gloves,
cross screwdriver, ESD box or bag, and key to the cabinet door.
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Context
CAUTION
Take proper ESD prevention measures, for example, wearing an ESD wrist strap or a pair of
ESD gloves, to protect the PSU from electrostatic damage.
Procedure
Step 1 Loosen the screws on the handle of the PSU panel by using a flathead screwdriver.
Step 2 Pull the handle gently to disconnect the buckle of the PSU from the subrack, and then removethe PSU from the slot, as shown in Figure 5-8.
Figure 5-8 Removing the PSU
Step 3 Place the new PSU in the corresponding slot and loosen the screws on the handle of the PSU.Then, pull the handle outwards.
Step 4 Slide the PSU along the guide rails into the slot and then push the handle back.
Step 5 Tighten the screws on the handle, as shown in Figure 5-9.
Figure 5-9 Installing the PSU
----End
Postrequisite
After replacing the PSU, check the following items:
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l The power LED on the PSU is ON (green) after the PSU is powered on.
l On the M2000 or LMT, the related alarms are cleared.
l Contact the local Huawei office to handle the faulty PSU.
5.7 Replacing an SLPU
This describes how to replace an SLPU. The SLPU is positioned above the BBU and used for
surge protection of the NodeB. Replacing the SLPU interrupts the services carried by the NodeB.
It takes about 10 minutes to replace an SLPU module.
Prerequisite
l The type of faulty SLPU is confirmed and the new SLPU is ready.
l The new SLPU is intact and its version is consistent with the version of the faulty SLPU.
l The tools and materials are ready. The tools and materials are the ESD wrist strap or gloves,cross screwdriver, ESD box or bag, and key to the cabinet door.
Context
Take proper ESD protection measures, for example, wearing an ESD wrist strap or a pair of
ESD gloves, to prevent electrostatic damage to the board, module, or electronic parts.
Procedure
Step 1 Attach labels to the cables on the SLPU panel, and then remove the cables.
Step 2 Remove the four screws on the mounting ears fixing the SLPU.
Step 3 Pull the SLPU with one hand until 1/3 of the SLPU is out. Hold the SLPU with another handand continue to pull it until it is completely removed from the cabinet.
Step 4 Put the removed SLPU into the ESD box or bag.
Step 5 Insert the new SLPU and then fasten the four screws removed from the mounting ears.
Step 6 Reinstall the cables onto the ports on the SLPU panel according to the labels.
----End
Postrequisite
After replacing the SLPU, check the following items:
l The cables are tightly and correctly connected.
l The related alarms on the M2000 or LMT are cleared after the SLPU is powered on.
l Contact the local Huawei office to handle the faulty SLPU.
5.8 Replacing a WRFU Module
This describes how to replace WRFU. The WRFU is located on the top of the BTS3900 cabinet.The WRFU provides the following functions: modulation and demodulation of baseband or RF
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signals, data processing, and signal combination and division. The replacement of the WRFU
disrupts the services carried on it. It takes about 10 minutes to replace a RFU module.
Prerequisite
l The type of the faulty WRFU module is obtained, and a new WRFU module is available.
l The new WRFU module is intact and the hardware version of the new WRFU is consistent
with that of the faulty WRFU module.
l The required tools and materials are ready. They are a torque wrench, an ESD wrist strap,
a Phillips screwdriver, an ESD box or bag, dustfree cloth, the key to the cabinet door, and
the standard handle.
Context
CAUTION
l Take proper ESD prevention measures, for example, wear an ESD wrist strap or ESD gloves
to prevent the boards, modules, and electronic components from being damaged by the static
electricity generated by the human body.
l Hold the RFU module with care as it is heavy.
Procedure
Step 1 Locate the faulty RFU and then run the BLK BRD command on the LMT to disable the faultyWRFU.
NOTE
This step can be performed either locally or remotely. Remote maintenance is suggested, though.
Step 2 Set the RFU switch on the DCDU-01 that corresponds to the RFU to OFF. The position of theRFU is shown in Figure 5-10.
Figure 5-10 Position of the RFU
Step 3 Label the cables connected to the RFU panel, and then disconnect the cables.
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Step 4 Use a Phillips screwdriver to loosen the four captive screws on the RFU panel.
Step 5 Insert the standard handle into the RFU to the corresponding keyhole on the RFU panel, andturn the handle key by 90. Pull out the module by holding the handle key using one hand, and
then remove the RFU using the other hand, as shown in Figure 5-11.
Figure 5-11 Removing the RFU
Step 6 Slide the new RFU along its guide rail until the module is in position (with obvious resistance).
Step 7 Tighten the four captive screws at four corners on the RFU panel so as to connect the RFUsecurely to the subrack.
Step 8 Install the cables to the ports on the RFU panel according to the labels.
Step 9 Set the RFU switch on the DCDU-01 that corresponds to the RFU to ON.
Step 10 Activate the BootROM or the software version of the new WRFU.
1. Run the DSP BRDVERcommand to check whether the BootROM or the software version
of the new WRFU are correct on the LMT.
2. If the software version is incorrect, run the ACT SOFTWARE command to reactivate the
BootROM or the software version of the WRFU on the LMT.
Step 11 On the LMT, run the UBL BRD command to unblock the board.
----End
Postrequisite
After replacing the RFU module, verify the following items:
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l The cable connections are correct and secure.
l After the RFU module is powered on, the RUN LED on the panel is green and blinks at
0.5 Hz.
l On the M2000 or the LMT, the alarms related to the RFU module are cleared after the RFU
module is powered on.
l Contact the local Huawei office to handle the faulty RFU module.
5.9 Replacing the Power Supply Subrack of the BTS3900
The power supply subrack is located in the lower cabinet of the BTS3900. It can be installed
with the PSU and PMU to provide the power input and output ports. It takes about 25 minutes
to replace the power supply subrack.
Prerequisite
l Confirm the model of the faulty power supply subrack and have the new power supply
subrack of the same type ready.
l The required tools and materials, such as ESD wrist strap, Phillips screwdriver, ESD box
or bag, and the key to the cabinet door, are available.
Context
CAUTION
Take proper ESD prevention measures, for example, wear an ESD wrist strap or gloves to preventthe boards, modules, and electronic components from being damaged by the static electricity
generated by human body.
Procedure
Step 1 Power off the BTS3900.
Step 2 Mark the cables on the power supply subrack and the PMU, and then disconnect them.
Step 3 Loosen the two screws on the panel of the PMU/PSU in the power supply subrack, as shown in
Figure 5-12.
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Figure 5-12 Removing the PMU/PSU
(1) Screws on the PMU panel (2) PMU (3) Power supply subrack
NOTE
Figure 5-12 shows the PMU, because the position of the two screws on the PSU panel is the same as that
on the PMU panel.
Step 4 Pull out the PMU or PSU along the guide rails by holding the ejector lever on the PMU/PSUpanel, as shown in Figure 5-12.
Step 5 Repeat Step 3 through Step 4 to remove all the PMUs/PSUs from the power supply subrack,and then put them into the ESD box.
Step 6 Remove the four M6x12 strews on the two mounting ears of the power supply subrack, as shownin Figure 5-13.
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Figure 5-13 Removing the screws from the mounting ears
Step 7 Pull out the power supply subrack with one hand, hold the power supply subrack with the otherhand, and then remove it.
Step 8 Put the faulty power supply subrack into an ESD box.
Step 9 Reversely perform the previous steps to install the new power supply subrack and removedPMUs/PSUs into the cabinet.
Step 10 Connect the removed cables to the ports on the panel of the power supply subrack and on thatof the PMU according to the marks.
Step 11 Power on the BTS3900.
----End
Postrequisite
After replacing the power supply subrack, perform the following operations:
l Check the cables and ensure that they are correctly and tightly connected.
l Ensure that the related alarms are cleared after the equipment is powered on.
l Contact the local Huawei office to handle the faulty power supply subrack.
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6Maintaining the PS4890About This Chapter
The hardware maintenance of the PS4890 covers the PMU, PSU, DCDU-04, and DCDU-03.
6.1 Replacing the PMU
When the PMU is faulty and cannot be repaired in time, you must replace it.
6.2 Replacing a PSU
When a PSU is faulty and cannot be repaired in time, you must replace it.
6.3 Replacing the DCDU-04
When the DCDU-04 is faulty, you must replace it.
6.4 Replacing the DCDU-03
When the DCDU-03 is faulty, you must replace it.
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6.1 Replacing the PMU
When the PMU is faulty and cannot be repaired in time, you must replace it.
Prerequisite
l The type of faulty PMU is confirmed and the new PMU is ready.
l The new PMU is intact and its version is consistent with the version of the faulty PMU.
l The tools and materials are ready. The tools and materials are the ESD wrist strap or gloves,
cross screwdriver, ESD box or bag, and key to the cabinet door.
Context
CAUTION
Take proper ESD prevention measures, for example, wearing an ESD wrist strap or a pair of
ESD gloves, to protect the PMU from electrostatic damage.
Procedure
Step 1 Disconnect the cables from the panel of the PMU, and then label the cables.
CAUTION
When inserting or removing the DB50 connector of the environment monitoring signal cable,
you must hold the connector with both hands and keep it perpendicular to the panel, to prevent
false alarms caused by bent pins.
Step 2 Loosen the screws on the handle of the PMU panel by using a flathead screwdriver.
Step 3 Pull the handle gently to disconnect the buckle of the PMU from the subrack, and then removethe PMU from the slot, as shown in Figure 6-1.
Figure 6-1 Removing the PMU
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Step 4 Set the DIP switch of the new PMU to 11000000.
Step 5 Place the new PMU in the corresponding slot and loosen the screws on the handle of the PMU.Then, pull the handle outwards.
Step 6 Slide the PMU along the guide rails into the slot and then push the handle back.
Step 7 Tighten the screws on the handle, as shown in Figure 6-2.
Figure 6-2 Installing the PMU
Step 8 Connect the cables, which have been disconnected from the PMU.
----End
Postrequisite
After replacing the PMU, check the following items:
l The cables are correctly and tightly connected.
l The RUN LED on the panel blinks green at 0.5 Hz after the PMU is powered on.
l On the M2000 or LMT, the related alarms are cleared.
l Contact the local Huawei office to handle the faulty PMU.
6.2 Replacing a PSU
When a PSU is faulty and cannot be repaired in time, you must replace it.
Prerequisite
l The type of faulty PSU is confirmed and the new PSU is ready.
l The new PSU is intact and its version is consistent with the version of the faulty PSU.
l The tools and materials are ready. The tools and materials are the ESD wrist strap or gloves,
cross screwdriver, ESD box or bag, and key to the cabinet door.
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Context
CAUTION
Take proper ESD prevention measures, for example, wearing an ESD wrist strap or a pair of
ESD gloves, to protect the PSU from electrostatic damage.
Procedure
Step 1 Loosen the screws on the handle of the PSU panel by using a flathead screwdriver.
Step 2 Pull the handle gently to disconnect the buckle of the PSU from the subrack, and then removethe PSU from the slot, as shown in Figure 6-3.
Figure 6-3 Removing the PSU
Step 3 Place the new PSU in the corresponding slot and loosen the screws on the handle of the PSU.Then, pull the handle outwards.
Step 4 Slide the PSU along the guide rails into the slot and then push the handle back.
Step 5 Tighten the screws on the handle, as shown in Figure 6-4.
Figure 6-4 Installing the PSU
----End
Postrequisite
After replacing the PSU, check the following items:
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l The power LED on the PSU is ON (green) after the PSU is powered on.
l On the M2000 or LMT, the related alarms are cleared.
l Contact the local Huawei office to handle the faulty PSU.
6.3 Replacing the DCDU-04
When the DCDU-04 is faulty, you must replace it.
Prerequisite
l The type of faulty DCDU-04 is confirmed and the new DCDU-04 is ready.
l The new DCDU-04 is intact and its version is consistent with the version of the faulty
DCDU-04.
l The tools and materials are ready. The tools and materials are the ESD wrist strap or gloves,
cross screwdriver, ESD box or bag, and key to the cabinet door.
Context
CAUTION
Cut off the AC input power of the PS4890 cabinet and set the MCB of the batteries to OFF before
replacing the DCDU-04. This ensures the personal safety.
Procedure
Step 1 Cut off the AC input power of the PS4890 cabinet.
Step 2 Set the MCB labeled BAT. on the panel of the power subrack to OFF.
Step 3 Set the DC output MCBs labeled SW0 and SW1 of the DCDU-04 to OFF.
Step 4 Disconnect the input power cable of the DCDU-04 from the DC output wiring terminalLOAD1 on the power subrack, and label the cables.
Step 5 Disconnect the temperature monitoring signal cable for the batteries, the surge protection alarmcable of the DCDU-03, and the environment monitoring signal cable for the power cabinet from
the HPMI board in the middle of the DCDU-04. And record the connection of each cable.
CAUTION
When inserting or removing the DB50 connector of the environment monitoring signal cable,
you must hold the connector with both hands and keep it perpendicular to the panel, to prevent
false alarms caused by bent pins.
Step 6 Disconnect the DC output power cables from the left and right wiring terminals on the DCDU-04,and then label the cables and record the connections of the cables.
Step 7 Remove the screws M6x12 from the DCDU-04, and then pull the DCDU-04 out slowly.
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Step 8 Place the new DCDU-04 on the installation position and push it slowly until it is in position.Then, tighten the screws M6x12.
Step 9 Connect the cables removed in Step 5 to the wiring terminals of the new DCDU-04.
Step 10 Connect the input power cable of the DCDU-04 to the DC output wiring terminal LOAD1 onthe power subrack.
Step 11 Connect the DC output power cables.
Step 12 Check the cable connections and ensure that the cables are correctly connected. Then, feed theAC input power to the PS4890 cabinet.
Step 13 Set the MCB labeled BAT. on the panel of the power subrack and all the MCBs on the DCDU-04to ON.
----End
Postrequisite
After replacing the DCDU-04, check the following items:
l The DCDU-04 is securely installed, and the cables are correctly connected.
l The DC output power of the DCDU-04 is normal.
l On the M2000 or LMT, the related alarms are cleared.
l Contact the local Huawei office to handle the faulty DCDU-04.
6.4 Replacing the DCDU-03
When the DCDU-03 is faulty, you must replace it.
Prerequisite
l The type of faulty DCDU-03 is confirmed and the new DCDU-03 is ready.
l The new DCDU-03 is intact and its version is consistent with the version of the faulty
DCDU-03.
l The tools and materials are ready. The tools and materials are the ESD wrist strap or gloves,
cross screwdriver, ESD box or bag, and key to the cabinet door.
Context
CAUTION
Cut off the AC input power of the PS4890 cabinet and set the MCB of the batteries to OFF before
replacing the DCDU-03. This ensures the personal safety.
Procedure
Step 1 Cut off the AC input power of the PS4890 cabinet.
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Step 2 Set the MCB labeled BAT. on the panel of the power subrack to OFF.
Step 3 Set all the DC output MCBs SW0 to SW9 on the DCDU-03 to OFF.
Step 4 Disconnect the surge protection alarm cable from the DCDU-03, and then label the cable and
record the connection of the cable.
Step 5 Disconnect the DC input power cable and DC output power cables from the DCDU-03, and thenlabel the cables and record the connections of the cables.
Step 6 Remove the screws M6x12 from the DCDU-03, and then pull the DCDU-03 out slowly.
Step 7 Place the new DCDU-03 on the installation position and push it slowly until it is in position.Then, tighten the screws M6x12.
Step 8 Connect the cables removed in Step 4 and Step 5 to the wiring terminals of the new DCDU-03according to the labels.
Step 9 Check the cable connections and ensure that the cables are correctly connected. Then, feed the
AC input power to the PS4890 cabinet.
Step 10 Set the MCB labeled BAT. on the panel of the power subrack and all the MCBs on the DCDU-03to ON.
----End
Postrequisite
After replacing the DCDU-03, check the following items:
l The DCDU-03 is securely installed, and the cables are correctly connected.
l The DC output power of the DCDU-03 is normal.
l On the M2000 or LMT, the related alarms are cleared.
l Contact the local Huawei office to handle the faulty DCDU-03.
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