I360 Mobile Phone Maintenance Manual v0.1
Contents
Preface
............................................................................................................................................3
1. Specifications
....................................................................................................................................4
2 Working Principles......................................................................................................................................5
2.1 GSM System Description
.................................................................................................6
2.1.1 General Introduction to Cellular Theory ...............................................................................6
2.1.2 GSM Description
.............................................................................................................6
2.1.3 Service Area
................................................................................................................9
2.1.4 Baseband Block Diagram....................................................................................................10
2.2 GSM Processor and Voice Baseband Codec .................................................................................. 11
2.3 GSM Processor ..............................................................................................................................12
2.3.1 Mcu Chip.............................................................................................................................12
2.3.2 ABB chip.............................................................................................................................13
3. Disassembly .............................................................................................................................................14
3.1 Recommended tools.......................................................................................................................15
3.2 Disassembling Steps.......................................................................................................................15
4 I360 Assembly Steps..............................................................................................................................16
5 Troubleshooting ........................................................................................................................................16
5.1 Block Diagram of Troubleshooting................................................................................................16
5.2 Problem Identification and Maintenance
................................................................17
5.2.1 Block Diagram and Modules Description...........................................................................17
5.2.2 Baseband troubleshooting ...................................................................................................20
5.2.3 RF Troubleshooting..........................................................................................................24
6. Engineering Mode....................................................................................................................................28
LENOVO Lenovo Mobile Telecommunications Co., Ltd.
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