Huawei U8815 User manual

U8815

Maintenance Manual

Issue

1.0

Date

2012-02-13

HUAWEI TECHNOLOGIES CO., LTD.

Issue 1.0 (2012-02-13)

Huawei Proprietary and Confidential

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 trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective

holders.

Notice

The purchased products, services and features are stipulated by the contract made between Huawei and

the customer. All or part of the products, services and features described in this document may not be

within the purchase 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

representations of any kind, either express or implied.

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 all statements, information, and

recommendations in this document do not constitute a warranty of any kind, express or implied.

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]

U8815

Maintenance Manual

About This Document

Issue 1.0 (2012-02-13)

Huawei Proprietary and Confidential

About This Document

Purpose

Prepared by

R&D personnel

Date

2012-02-20

Reviewed by

Maintenance support team

Date

2012-02-23

Approved by

Service representative

Date

2012-02-23

Change History

Date

Version

Change Reason

Section

Description

Author

2012-02-23

V1.0

Released the first draft.

R&D personnel

U8815

Maintenance Manual

Contents

Issue 1.0 (2012-02-13)

Huawei Proprietary and Confidential

iii

Contents

1 Product Introduction ....................................................................................................................1

1.1 Appearance.......................................................................................................................................................1

1.2 Features............................................................................................................................................................1

2 Maintenance Instructions............................................................................................................3

2.1 Applicable Scope..............................................................................................................................................3

2.2 Precautions.......................................................................................................................................................3

2.3 Obtaining Product and Maintenance Information ............................................................................................3

3 Exploded View...............................................................................................................................4

4 PCBA Components .......................................................................................................................6

5 Software Upgrade .........................................................................................................................9

5.1 Upgrade Preparation.........................................................................................................................................9

5.2 Upgrade Process...............................................................................................................................................9

6 Maintenance Tools......................................................................................................................11

7 Disassembly Procedure..............................................................................................................13

8 Assembly Procedure...................................................................................................................17

9 Principles and Failure Analysis ...............................................................................................20

9.1 Block Diagram and Handset Introduction......................................................................................................20

9.2 Baseband Unit................................................................................................................................................21

9.2.1 Power-on Management Circuits............................................................................................................21

9.2.2 Charging Management Circuits ............................................................................................................26

9.2.3 Clock Circuit.........................................................................................................................................30

9.2.4 Flash Memory Circuit...........................................................................................................................32

9.3 RF Unit...........................................................................................................................................................37

9.3.2 Power Amplifier....................................................................................................................................38

9.3.3 Troubleshooting ....................................................................................................................................40

9.4 Peripheral Circuits..........................................................................................................................................44

9.4.1 Display Screen ......................................................................................................................................44

9.4.2 Vibration ...............................................................................................................................................48

9.4.3 Call Reception.......................................................................................................................................49

9.4.4 Call Transmission..................................................................................................................................53

U8815

Maintenance Manual

Contents

Issue 1.0 (2012-02-13)

Huawei Proprietary and Confidential

9.4.5 Headset..................................................................................................................................................57

9.4.6 SIM Card...............................................................................................................................................59

9.4.7 I/O Connector........................................................................................................................................60

9.4.8 microSD Card Connector......................................................................................................................61

9.4.9 FM.........................................................................................................................................................63

10 Solder Points on the PCB and BGA Chip.............................................................................66

11 Performance Test.......................................................................................................................69

11.1 Keys..............................................................................................................................................................69

11.2 MMI Test......................................................................................................................................................70

11.3 Voice Call Test..............................................................................................................................................71

U8815

Maintenance Manual

Figures

Issue 1.0 (2012-02-13)

Huawei Proprietary and Confidential

Figures

Figure 1-1 Appearance of the U8815 handset .......................................................................................................1

Figure 3-1 Exploded view diagram.......................................................................................................................4

Figure 4-1 PCBA components diagram 1..............................................................................................................6

Figure 4-2 PCBA components diagram 2..............................................................................................................7

Figure 4-3 PCBA components diagram 3..............................................................................................................8

Figure 4-4 PCBA components diagram 4..............................................................................................................8

Figure 5-1 Upgrade process diagram...................................................................................................................10

The following figures show the procedures. ........................................................................................................13

Figure 9-1 Block diagram....................................................................................................................................20

Figure 9-2 Power-on management circuit diagram .............................................................................................21

Figure 9-3 Troubleshooting process for no current .............................................................................................24

Figure 9-4 Troubleshooting process for weak current.........................................................................................25

Figure 9-5 Troubleshooting process for high current ..........................................................................................26

Figure 9-6 Charging management circuit diagram 1...........................................................................................27

Figure 9-7 Charging management circuit diagram 2...........................................................................................27

Figure 9-8 Charging management circuit diagram 3...........................................................................................27

Figure 9-9 Charging management circuit diagram 4...........................................................................................28

Figure 9-10 Troubleshooting process for charging failures.................................................................................29

Figure 9-11 19.2 MHz circuit block diagram 1 ...................................................................................................30

Figure 9-12 19.2 MHz circuit block diagram 2 ...................................................................................................31

Figure 9-13 32.768 kHz circuit block diagram 1.................................................................................................31

Figure 9-14 Analysis of clock circuit ..................................................................................................................31

Figure 9-15 Flash memory circuit diagram 1 ......................................................................................................33

Figure 9-16 Flash memory circuit diagram 2 ......................................................................................................33

Figure 9-17 Flash memory circuit diagram 3 ......................................................................................................34

Figure 9-18 Flash memory circuit diagram 4 ......................................................................................................35

U8815

Maintenance Manual

Figures

Issue 1.0 (2012-02-13)

Huawei Proprietary and Confidential

Figure 9-19 Analysis of the U8815 memory interface ........................................................................................36

Figure 9-20 Transmitting and receiving circuit block diagram ...........................................................................37

Figure 9-21 WCDMA IMT PAdiagram..............................................................................................................38

Figure 9-22 WCDMA 850 PA diagram ...............................................................................................................39

Figure 9-23 WCDMA PCS PA diagram ..............................................................................................................39

Figure 9-24 GSM Quad_band_PAdiagram.........................................................................................................39

Figure 9-25 UMTS IMT RX INTERSTAGE CHAIN diagram...........................................................................40

Figure 9-26 Diagram of dualband RF transmitting and receiving by using RTR6285A chip .............................40

Figure 9-27 Troubleshooting process for receiving failure .................................................................................41

Figure 9-28 Troubleshooting process for transmission failure ............................................................................43

Figure 9-29 Display screen circuit diagram 1......................................................................................................45

Figure 9-30 Display screen circuit diagram 2......................................................................................................45

Figure 9-31 Display screen circuit diagram 3......................................................................................................46

Figure 9-32 Troubleshooting process for no LCD display ..................................................................................47

Figure 9-33 Motor circuit diagram......................................................................................................................48

Figure 9-34 Vibration maintenance process ........................................................................................................49

Figure 9-35 Call reception circuit diagram 1.......................................................................................................50

Figure 9-36 Call reception circuit diagram 2.......................................................................................................50

Figure 9-37 Call reception circuit diagram 3.......................................................................................................50

Figure 9-38 Call reception circuit diagram 4.......................................................................................................51

Figure 9-39 7227A audio processing diagram.....................................................................................................51

Figure 9-40 Troubleshooting process for sound failure.......................................................................................53

Figure 9-41 Primary handset microphone circuit diagram ..................................................................................54

Figure 9-42 Secondary handset microphone circuit diagram ..............................................................................55

Figure 9-43 Troubleshooting process for sound failure.......................................................................................56

Figure 9-44 Headset circuit block diagram .........................................................................................................57

Figure 9-45 Troubleshooting process for no sound from the headset failure ......................................................58

Figure 9-46 SIM card circuit diagram.................................................................................................................59

Figure 9-47 Troubleshooting process for the UIM card detection failure ...........................................................60

Figure 9-48 I/O connector circuit diagram..........................................................................................................61

Figure 9-49 microSD card connector circuit diagram .........................................................................................62

Figure 9-50 Troubleshooting process for micorSD card read failure ..................................................................63

Figure 9-51 FM circuit diagram 1 .......................................................................................................................63

U8815

Maintenance Manual

Figures

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vii

Figure 9-52 FM circuit diagram 2 .......................................................................................................................64

Figure 9-53 FM circuit diagram 3 .......................................................................................................................64

Figure 9-54 Troubleshooting process for FM radio failure .................................................................................65

Figure 10-1 Diagram 1 of the solder points on the PCB and BGA chip .............................................................66

Figure 10-2 Diagram 2 of the solder points on the PCB and BGA chip .............................................................67

Figure 10-3 Diagram 3 of the solder points on the PCB and BGA chip .............................................................67

Figure 10-4 Diagram 4 of the solder points on the PCB and BGA chip .............................................................68

Figure 11-1 U8815 handset key...........................................................................................................................69

U8815

Maintenance Manual

Tables

Issue 1.0 (2012-02-13)

Huawei Proprietary and Confidential

viii

Tables

Table 1-1 Description of the features.....................................................................................................................1

Table 3-1 List of components in the exploded view ..............................................................................................4

Table 5-1 Upgrade preparation ..............................................................................................................................9

Table 6-1 List of maintenance tools..................................................................................................................... 11

Table 9-1 List of voltages converted from VHP_PWR by PM8029 power management chip............................23

Table 9-2 Description of the signals in the circuit diagram in this section ..........................................................30

Table 9-3 Description of the signals in the circuit diagram in this section ..........................................................32

Table 9-4 Description of the signals in the circuit diagram in this section ..........................................................36

Table 9-5 Logic table of the RF switch................................................................................................................38

Table 9-6 Truths for control signals.....................................................................................................................42

Table 9-7 Description of the signals in the circuit diagram in this section ..........................................................43

Table 9-8 Description of the signals in the circuit diagram in this section ..........................................................47

Table 9-9 Description of the signals in the circuit diagram in this section ..........................................................49

Table 9-10 Audio output......................................................................................................................................52