Contents
1. Summary ............................................................................................................................................................. 4
1.1 Mobile Feature ... ..................................................................................................................................... 4
1.2 Mobile Application System..................................................................................................................... 4
1.3 RF Part .................................................................................................................................................. .. 6
1.3.1 Transmitter ... ............................................................................................................................... 7
1.3.2 TX Part ... ..................................................................................................................................... 7
1.3.3 Frequency Synthesizer ... ............................................................................................................ 7
1.4 Baseband and Logical Control Part ... .................................................................................................. . 7
1.4.1 Control and processing of RF part ............................................................................................. 7
1.4.2 Power Management ................................................................................................................. .. 7
1.4.3 Program Memory and Logical Control Part ............................................................................. 8
1.4.4 Audio Interface... ......................................................................................................................... 8
1.4.5 Camera and LCD Interface ...................................................................................................... . 8
1.4.6 SIM and T-card Interface ......................................................................................................... . 9
1.4.7 USB and TP Interface ................................................................................................................10
2. Mobile Maintenance Guide ............................................................................................................................. 11
2.1 Baseband Common Fault ......................................................................................................................12
2.1.1 “Cannot download” fault check flow ...................................................................................... 12
2.1.2 “Cannot power on” fault check flow ........................................................................................13
2.1.3 “Cannot charge” fault check flow .............................................................................................14
2.1.4 No Vibration ...............................................................................................................................15
2.1.5 No Ring ..................................................................................................................................... 15
2.1.6 No echo (The other side cannot hear the voice) ... ...................................................................16
2.1.7 No echo (Cannot hear the other side's voice) ...........................................................................16
2.1.8 LCD shows abnormal ............................................................................................................... 17
2.1.9 Camera abnormal ...................................................................................................................... 17
2.1.10 Capacitive Touch Panel abnormal ......................................................................................... 18
2.1.11 “Cannot recognize T Card” fault check flow ... .................................................................... 18
2.1.12 “Cannot recognize SIM Card” fault check flow ... ................................................................19
2.1.13 ALS/PS Sensor abnormal ... ....................................................................................................20
2.2 RF Common Fault ... ..............................................................................................................................21
2.2.1 “Low receive sensitivity” fault check flow ............................................................................. 21
2.2.2 “Large Frequency difference” fault check flow ... ...................................................................21
2.2.3 “Cannot transmit” fault check flow ..................................................................................... 22
2.2.4 “Cannot receive” fault check flow ............................................................................................23
2.3 MT6620 Common Fault ........................................................................................................................24
2.3.1 GPS Fault ... ............................................................................................................................... 24
2.3.2 WIFI/BT Fault ... ........................................................................................................................25
2.3.3 FM Fault .....................................................................................................................................25
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