Huawei E5331 User manual

E5331 Maintenance Manual Basic Version
V1.0
Prepared by
Product Department
Documentation Team
Date
2012-2-6
Reviewed by
Product Department
Technology Support Engineer
Date
2012-2-6
Approved by
Product Department Service
Representative of product
Date
2012-2-6
Huawei Technologies Co., Ltd.
All rights reserved

E5331 Maintenance Manual Basic Version V1.0
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Revision Record
Date
Revision
Version
Revision
Reason
Section
Number
Change
Description
Author
2012-2-6
V1.0
Product Department
Documentation
Team

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Contents
1PRODUCT INTRODUCTION............................................................................................................................................5
1.1 PRODUCTAPPEARANCE................................................................................................................................................5
1.2 HARDWARE SPECIFICATIONS .......................................................................................................................................5
2MAINTENANCE INSTRUCTIONS...................................................................................................................................7
2.1 DOCUMENTAPPLICATION ............................................................................................................................................7
2.2 MAINTENANCE PRECAUTIONS .....................................................................................................................................7
2.3 MAINTENANCE INFORMATION DIRECTION..................................................................................................................7
3EXPLODED VIEW OF THE WHOLE UNIT ....................................................................................................................8
4LOCATION OF COMPONENTS ON THE MAIN BOARD............................................................................................9
5SOFTWARE UPGRADE..................................................................................................................................................12
5.1 PREPARATIONS BEFORE UPGRADE ............................................................................................................................12
5.2 HARDWARE CONNECTION...........................................................................................................................................12
5.3 CLIENT SOFTWARE INSTALLATION ............................................................................................................................12
5.4 UPDATE PROCEDURE ..................................................................................................................................................19
5.4.1 Normal Upgrade............................................................................................................................................20
5.5 CHECK THE SOFTWARE VERSION ..............................................................................................................................22
5.6 EXCEPTION HANDLING...............................................................................................................................................22
6MAINTENANCE TOOLS.................................................................................................................................................24
7DISASSEMBLY PROCEDURE.......................................................................................................................................26
8ASSEMBLY PROCEDURE .............................................................................................................................................28
9TROUBLESHOOTING FOR COMMON FAULTS........................................................................................................30
9.1 PRINCIPLE INSTRUCTION ...........................................................................................................................................30
9.2 NO POWER ON.............................................................................................................................................................31
9.2.1 No Power On—High Current (DC Power Supply) ......................................................................................31
9.2.2 No Power On—Small Current (DC Power Supply) .....................................................................................34
9.3 CHARGE FAILURE .......................................................................................................................................................36
9.4 SIM CARD FAILURE....................................................................................................................................................37
9.5 DATACOMMUNICATION FAILURE ..............................................................................................................................38
9.6 DISPLAY FAILURE........................................................................................................................................................40
9.7 WLAN FAILURE .........................................................................................................................................................42
9.8 RFFAILURE.................................................................................................................................................................44

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9.8.1 RF Receiving Failure –WCDMA2100MHz................................................................................................44
9.8.2 RF Receiving Failure –WCDMA900MHz..................................................................................................46
9.8.3 RF Receiving Failure –GSM........................................................................................................................47
9.8.4 RF Transmitting Failure –WCDMA 2100MHz...........................................................................................48
9.8.5 RF Transmitting Failure –WCDMA 900MHz.............................................................................................49
9.8.6 RF Transmitting Failure –GSM ..................................................................................................................50
10 WELD POINTS INDICATOR CHART FOR PCB.....................................................................................................51
11 FUNCTIONAL TEST....................................................................................................................................................54
11.1 APPEARANCE INTRODUCTION....................................................................................................................................54
11.2 DATA SERVICE.............................................................................................................................................................55
11.2.1 USB Modem.....................................................................................................................................................55
11.2.2 Wireless Modem.............................................................................................................................................55
11.3 INTERNET TEST...........................................................................................................................................................57

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1 Product Introduction
1.1 Product Appearance
1.2 Hardware Specifications
Item
Specifications
Technical standard
WAN: HSPA+/HSPA/UMTS/EDGE/GPRS/GSM
WLAN: IEEE 802.11b/g/n
Operating frequency
HSPA+/HSPA/UMTS
E5331: 2100/900MHz
EDGE/GPRS/GSM: 1900/1800/900/850MHz
WLAN: 2.401GHz–2.495GHz
Internal memory
128MB Flash, 64MB Memory
Maximum transmitter
power
UMTS: ≥24 (+1/-3) dBm
WLAN (Power adapter mode)
802.11b: 14 (+/-3) dBm
802.11g: 11 (+/-3) dBm
802.11n: 7 (+/-3) dBm
Receiver sensitivity
UMTS: -106dBm
WLAN 802.11b: -76dBm@11Mbps/-82dBm@1Mbps
WLAN 802.11g: -65dBm@54Mbps
WLAN 802.11n: -64dBm@65Mbps

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Item
Specifications
WLAN speed
802.11b: Up to 11Mbit/s
802.11g: Up to 54Mbit/s
802.11n: Support MCS0–MCS7; Up to 72.2Mbit/s.
Maximum power
consumption
3.5 W
Power supply
AC: 100V–240V
DC: 5V, 1A
Battery
Type: Li (Rechargeable)
Capacity: 3.7 V, 1500 mAh
Maximum working time: 4.5 hours
Maximum standby time: 150 hours while Wi-Fi is off; 30 hours while Wi-Fi is often
on.
External interfaces
USB interface: Micro USB
SIM card: standard 6-pin SIM card interface
Display screen
LED
key-press
Power key, Reset key
Antenna
Built-in GSM/UMTS main diversity antenna
Built-in UMTS diversity antenna
Built-in WLAN antenna
Dimensions
(D ×W ×H)
92.8mm×60mm×13.8mm
Weight
about 83g (including the battery)
Temperature
Operating: 0℃to +35℃
Storage: –40℃to +70℃
Humidity
5% to 95%

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2 Maintenance Instructions
2.1 Document Application
This document provides instructions for the maintenance of Huawei products for the maintenance personnel in
Huawei-authorized service sites. This manual is Huawei proprietary and is only permitted to be used by
authorized service sites or companies. Mistakes may be found in the document. If you have found any mistake
or have any suggestion, please contact our customer service personnel.
2.2 Maintenance Precautions
Maintenance and calibration can be conducted only by qualified technical personnel.
Always wear an antistatic wrist strap during the operation and conduct the maintenance in an antistatic
room.
Ensure that all the components, screws, and insulators are properly installed after maintenance or
calibration. Ensure that all the cables are properly connected.
Ensure that the soldering should comply with the environmental requirements and is lead-free.
2.3 Maintenance Information Direction
To obtain related product knowledge and maintenance information, please visit Huawei website
http://www.huaweidevice.com/worldwide/technicaIndex.do
Electrostatic discharging is the major cause for the damage of sensitive electronic components.
Each service site should attach great importance to the electrostatic discharging and strictly
observe the antistatic measures described in this manual.

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3 Exploded View of the Whole Unit
This exploded view is only applied to show phone frame. It is not regarded as a reference for applying
spare parts.
No.
Description
Quantity
1
WiFi Antenna
1
2
Battery Cover
1
3
Battery
1
4
Bolt
7
5
Back Cover
1
6
Main Antenna
1
7
DiversityAntenna
1
8
Water Proof Label
1
9
Main Board
1
10
Front Cover
1
11
Power Button Dome
1
12
Reset Button Dome
1
2
3
10
11
5
6
1
4
7
9
12
8

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4 Location of Components on the Main Board
Take E5331 for example:
X3501 Crystal
Units,32.768kHz
Failure Symptom:
No power on
Z901&Z902 Diversity
Receive SAW FILTER
-W900MHz &W2100MHz
Failure Symptom:
RF Receiving Failure
U3201 FLASH
Failure Symptom:
No power on;
Others software failure
Z603&Z602SAW FILTER
–W900MHz&W2100MHz
Failure Symptom:
Weak signal
U3801 Battery
Management IC
Failure Symptom:
Charge failure
TCXO301 TCXO,26MHz
Failure Symptom:
No power on
U3101 CPU
Failure Symptom:
No power on,
Others failure
U3501 PM
Failure Symptom:
No power on
Z501&Z401SAW FILTER
–W900MHz&W2100MHz
Failure Symptom:
TX failure
U3601 Voltage
Regulator
Failure Symptom:
RF Failure - WCDMA
X4001 Crystal
Osillator,26MHz
Failure Symptom:
WiFi Failure
U4102 RF Switch
Failure Symptom:
WiFi Failure
U4001 WIFI IC
Failure Symptom:
WiFi Failure
Z4101 Ceramics Filter
2450MHz
Failure Symptom:
WiFi Failure
U901 Duplexer
–W2100MHz&W900MHz
Failure Symptom:
RF Failure
U101 RF Transceiver
Failure Symptom:
RF Failure
U501 Power Module
–W2100MHz
Failure Symptom:
RF Transmitting
Failure
U401 Power Module
–W900MHz
Failure Symptom:
RF Transmitting Failure
U402 Duplexer
-W2100MHz
Failure Symptom:
RF Failure
U502 Duplexer
–W900MHz
Failure Symptom:
RF Failure
U801
Front End Module
Failure Symptom:
RF Failure
U703 SPDT
Failure Symptom:
RF Failure
Z701 SAW FILTER
–W900MHz
Failure Symptom:
RF Transmitting Failure
Z702 SAW FILTER
–W850MHz
Failure Symptom:
RF Transmitting Failure
S3501
POWER BUTTON
Failure Symptom:
No power on
No power on

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BOM List is only for your reference, the lasted BOM information is downloaded in the system of
Huawei.
BOM
Description
Location
07050038
NTC,10000ohm,NTC,SMD,0402,B=3380K,TS16949
RT301
07050063
Thermistor,150kohm+/-5%,SMT,0402
RT4101,RT4201,RT4224
07040075
Varistor,18V,14V,10A,40V,SMT,0402,82pF@1KHz
RV3301,RV3601
07040071
Varistor,90V,45V,1A,300V,SMT,0402,3pF@1MHz
RV4101,RV4102,RV4103,
RV4104,RV4105,RV4106
16100036
Touch switch-SPST-12V(DC)-0.05A-SMT-0.6mm-5*2.5-100000-for
Mobile phone side key
S3301,S3302,S3601
12070021
TCXO,26MHz,+/-1.5ppm(max),+2.85V,+/-1.5ppm(max),30degC,+80d
egC
TCXO301
35020092
Consumption Chip,Hi6331RBCV301,STFBGA,2.85V/1.8V,2G/3G
Multi mode and Multi band RF Transceiver
U101
35020094
Consumable Chip,Hi6481RBCV150,TFBGA,3.3/5V,Average Input
Current Limit,Six Bucks E5
U201
40060266
MCP,1Gb(128Mb*8) NAND
FLASH,166MHz,128KB,1.8V,FBGA107(Pb-free),512Mb(32Mb*16)
DDR
U301
47100306
Power Module,1920-1980MHz,27dB,28dBm,QFN,1000V
U401
13080065
Duplexer,TX:1920~1980MHz/RX:2110~2170MHz,1.8dB,2.2dB,50dB/
42dB,2520
U402
47140042
0.5~3GHz,SPDT,0.46,22,TSSON
U1004,U1204,U601,U702,
U703,U902
47100348
RF Power Amplifying
Module,824MHz~849MHz/880MHz~915MHz/1710MHz~1785MHz/18
50MHz~1910MHz,33.5,35dBm,LGA
U701
47140051
RF Switch,
824-2170MHz,SP10T,0.65-1.2dB,1.5,18dB/58dB,QFN,200~260V(HB
M),Termnal Dedicated
U802
51621511
DKBA8.382.0693,U7519_Antenna_Pin,U7519
U803,U805
36020336
LVCMOS,Unbuffer Single Inverter
Gate,SC-70,9.0ns,4.0mA,CMOS,CMOS
U806
47140045
0.5~2.5GHz,SP4T,0.95,15,QFN
U901
47100387
RF Power Amplifying Module,880MHz~915MHz,28/18/11,QFN,1000V
U1201
13080105
Duplexer,TX:880~915MHz/RX:920~960MHz,3dB.,3.5dB.,47dB./38dB
.,2.5*2.0*0.5mm
U1202

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35020090
Consumable
Chip,Hi6755RBCV120,SVFBGA,1.2/2.5V,WCDMA/HSPA
Communication Baseband Function,SOC Support Dual Mode PS
U3101
39110566
Switching Regulators,1~4V,1.5A,SMT
U3802
39200280
Terminal Dedicated IC,WIFI 802.11bgn,1.8V~3.3V,BGA97(Pb-Free)
U3901
47140023
RF Switch,DC~3000MHz,SPDT,0.6dB,1.4,20dB,SOP6-26-50,250V
U4002
39070085
Battery Management IC,4.1~16V,DC-DC Charger,Smart Power
Control,QFN,SMT
U4201
39110532
Voltage Regulator,Vin~20V,0.7A,5-Pin SOT23
U4301
12020123
Crystal Units,32.768kHz,12.5pF,20ppm,65kohm,SX4
X3601
12020132
Crystal Osillator,26MHz,12pF,+/-10ppm,50ohm,SMD3225
X3901
13010186
SAW FILTER,1950,2.9
Z401
13010253
SAW Filter,881.5MHz/942.5MHz,2.5dB/3.0dB,50V,1814
Z601
13010176
SAW filter,2140MHz,1.9dB,1.4*1.1mm
Z602
13010189
SAW FILTER,897.5MHz,2.7dB,100V(MM),SFLT5-0101
Z1201,Z701
13010174
SAW Filter,836.5MHz,2.1dB,50V,1.4*1.1mm,TS16949
Z702
13010320
SAW Filter,881.5MHz/942.5MHz,2.5dB/3.2dB,50V,1814
Z801
13010321
SAW Filter,1842.5MHz/1960MHz,3.0dB/3.0dB,50V,1814
Z802
13010148
SAW Filter ,2140,3.0dB,50V,00231804
Z901
13010240
SAW FILTER,(925~960)MHz,2.1dB,100v,SFLT5-0101
Z903
13030025
Ceramics Filter,2450MHz,2.30dB,2.5*2.0*1.3mm
Z4001
47100305
Power Module, 824MHz~849MHz,27dB,28.5dBm
U501
13080070
Duplexer,TX:824MHz~849MHz/RX:869MHz~894MHz
U502
13030024
ceramic filter,869.5MHz,0.65 dB,ESD
U503
13010174
SAW Filter,836.5MHz,2.1dB,50V,1.4*1.1mm
Z501
7040072
ESD_EMI Filter,14V,30pF,800~3000MHz,ARRAY,0603
Z4301,Z4302,Z4303

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5 Software Upgrade
5.1 Preparations Before Upgrade
Item
Content
Remark
Upgrade
software
E5331 Mobile WiFi Firmware
v3.6.exe
Firmware software
(The client software is just for you information,
please download the newest software to upgrade )
Upgrade mode
Normal upgrade
/
Force upgrade
/
Upgrade
condition
Computer
Windows XP / Windows 7/ Vista
USB data cable
BOM: 02450760
5.2 Hardware connection
5.3 Client Software Installation
1. Power on the E5331.
2. Connect the E5331 to the PC with USB data cable.
3. Double click the “MobileWiFi”.
PC
E5331
USB Cable

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4. Click “Next” to continue.
5. Click “I Agree” to continue.

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6. Click “Install” to continue.

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7. The installation is completed. Click “Finish” to close the window.

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8. Power on the wireless modem. Then connect the wireless modem to the PC with USB data cable. Access
the “Device Management” to check if the connection between the wireless modem and the PC is well.

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5.4 Update Procedure
Please install the client software before upgrade.
After updated successfully, please restore the factory settings.

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5.4.1 Normal Upgrade
1. Start Upgrade tool, shows as below(actual verisoin is depended on the upgraded firmware )，click “next”
button to ready to start upgrade the E5331:
2. click start button, the upgrade sofrware start upgrading, shows as below: