Contents
About This Document .................................................................................................................... ii
1 Product Overview ......................................................................................................................... 1
1.1 Appearance ....................................................................................................................................................... 1
1.2 Features ............................................................................................................................................................ 2
2 Applicable Scope and Precautions ............................................................................................ 4
2.1 Applicable Scope .............................................................................................................................................. 4
2.2 Precautions ....................................................................................................................................................... 4
2.3 How to Obtain Product and Repair Information .............................................................................................. 4
3 Exploded View............................................................................................................................... 5
4 Components on the PCBA ........................................................................................................... 7
5 Software Upgrade ......................................................................................................................... 9
5.1 Upgrade Preparation ......................................................................................................................................... 9
5.2 Performing an Upgrade .................................................................................................................................... 9
6 Maintenance Tools ...................................................................................................................... 11
7 Disassembly Procedure .............................................................................................................. 13
8 Assembly Procedure ................................................................................................................... 17
9 Principles and Failure Analysis ............................................................................................... 21
9.1 Block Diagram ............................................................................................................................................... 21
9.1.1 Functions of the PCBA ......................................................................................................................... 22
9.2 Baseband Unit ................................................................................................................................................ 26
9.2.1 Power-on Management Circuits ............................................................................................................ 26
9.2.2 Charging Management Circuits ............................................................................................................ 30
9.3 RF Unit ........................................................................................................................................................... 31
9.3.1 RF Failure ............................................................................................................................................. 31
9.3.2 GPS ....................................................................................................................................................... 35
9.3.3 Wi-Fi/Bluetooth/FM Module ................................................................................................................ 35
9.4 Peripheral Circuits .......................................................................................................................................... 37
9.4.1 Display .................................................................................................................................................. 37
9.4.2 Camera .................................................................................................................................................. 40
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