Table Of Contents - Huawei U8815 Maintenance Manual

User manual (74 pages)

User manual (69 pages)

Quick start manual (205 pages)

Table of Contents

U8815

Maintenance Manual

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

Issue 1.0 (2012-02-13)

Huawei Proprietary and Confidential

Contents

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