U8500 Maintenance Manual Basic Version V1.1 Internal
2010-12-21 Huawei confidential. No spreading without permission. Page 3 of 62
Contents
1 PRODUCT INTRODUCTION ............................................................................................................................... 5
1.1 PRODUCT APPEARANCE........................................................................................................................................ 5
1.2 PRODUCT SPECIFICATIONS ................................................................................................................................... 5
2 MAINTENANCE INFORMATION GUIDE....................................................................................................... 7
2.1 DOCUMENT APPLICATION .................................................................................................................................... 7
2.2 MAINTENANCE PRECAUTIONS............................................................................................................................. 7
2.3 OBTAINING MAINTENANCE INFORMATION........................................................................................................ 7
3 EXPLOSIVE VIEW OF PRODUCT..................................................................................................................... 8
4 LOCATION OF COMPONENTS ON THE MAIN BOARD........................................................................ 10
5 SOFTWARE UPGRADE........................................................................................................................................ 16
5.1 PREPARATION FOR UPGRADE ............................................................................................................................. 16
5.2 UPGRADE PROCESS ............................................................................................................................................. 16
5.3 FORCE DOWNLOAD ............................................................................................................................................. 20
5.4 CHECK THE FIRMWARE VERSION ...................................................................................................................... 20
5.5 ERROR HANDLING............................................................................................................................................... 22
6 MAINTENANCE TOOLS ..................................................................................................................................... 23
7 DISASSEMBLY PROCEDURE ........................................................................................................................... 25
8 ASSEMBLY PROCEDURE................................................................................................................................... 31
9 TROUBLE SHOOTINGS OF COMMON FAULTS ....................................................................................... 37
9.1 PRINCIPLE INSTRUCTION .................................................................................................................................... 37
9.2 NO POWER ON..................................................................................................................................................... 37
9.2.1 High Current (DC power supply)...........................................................................................................................37
9.2.2 Low Current (DC power supply) ...........................................................................................................................40
9.3 CAN’T CHARGE.................................................................................................................................................... 42
9.4 KEYBOARD MALFUNCTION ............................................................................................................................... 43
9.5 DISPLAY MALFUNCTION..................................................................................................................................... 44
9.6 AUDIO MALFUNCTION ........................................................................................................................................ 45
9.6.1 No Ring Tone ...............................................................................................................................................................45
9.6.2 Voice Transmitting Failure.......................................................................................................................................46
9.6.3 Receiver Failure...........................................................................................................................................................47
9.6.4 Earphone No Voice .....................................................................................................................................................48
9.6.5 Earphone Can’t Transmit Voice..............................................................................................................................49
9.7 SIM CARD FAILURE ............................................................................................................................................ 49
9.8 SD CARD FAILURE .............................................................................................................................................. 50
9.9 VIBRATION FAILURE............................................................................................................................................ 50
9.10 CAMERA FAILURE.............................................................................................................................................. 51
9.11 GPS FAILURE ..................................................................................................................................................... 52
9.12 WIFI FAILURE.................................................................................................................................................... 53
9.13 RF FAILURE ........................................................................................................................................................ 54
9.13.1 WCDMA 2100MHz Signal Failure ....................................................................................................................54
9.13.2 WCDMA 850MHz Signal Failure (Optional) .................................................................................................56
9.13.3 GSM Signal Failure .................................................................................................................................................58
10 FUNCTIONAL TEST ........................................................................................................................................... 60
