Table Of Contents - Huawei U8185 Maintenance Manual

Quick start manual (29 pages)

Faqs (42 pages)

Manual (29 pages)

Table of Contents

U8185

Maintenance Manual

About This Document.................................................................................................................... ii

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

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

1.2 Specifications .....................................................................................................................................................................1

2 Applicable Scope and Precautions ................................................................................................. 4

2.1 Applicable Scope ...............................................................................................................................................................4

2.2 Precautions ..........................................................................................................................................................................4

2.3 How to Obtain Product and Repair In formation ..........................................................................................................4

3 Exploded Vie w ................................................................................................................................. 5

4 Components on the PCBA.............................................................................................................. 7

5 Software Upgrade ......................................................................................................................... 10

5.1 Upgrade Preparation ........................................................................................................................................................10

5.2 Upgrade Procedure ..........................................................................................................................................................10

5.3 Troubleshooting................................................................................................................................................................11

6 Maintenance Tools ........................................................................................................................ 12

7 Disassembly Procedure ................................................................................................................. 14

8 Assembly Procedure ...................................................................................................................... 16

9 Principles and Failure Analysis ................................................................................................... 18

9.1 Block Diagram .................................................................................................................................................................18

9.2 Baseband Unit ..................................................................................................................................................................19

9.2.1 Po wer-on Management Circuits ..........................................................................................................................19

9.2.2 Charging Management Circuits ..........................................................................................................................24

9.2.3 Clock Circu it ..........................................................................................................................................................31

9.2.4 Memory Circu it......................................................................................................................................................32

9.3 RF Un it ..............................................................................................................................................................................34

9.3.1 GSM Quad Band Transception Circu it ..............................................................................................................36

9.3.2 WCDMA2100/1900 Transception Circuit ........................................................................................................39

9.3.3 W900/ 850 Transception Circuit ..........................................................................................................................43

9.4 Peripheral Circu its ...........................................................................................................................................................48

Issue 1.0 (2012-03-23)

Huawei Proprietary and Confidential

Contents

iii