FLY E185, Service Manual

Page: 2 / 47

FLY E185
Service Manual
CKT Confidential Page 2 of 47
CONTENT
CHAPTER 1: SUMMARY ....................................................................................................................4
CHAPTER 2: PCBA OVERVIEW .......................................................................................................5
2.1 T
OP SIDE
..........................................................................................................................................5
2.2 B
OTTOM SIDE
..................................................................................................................................6
CHAPTER 3: EXPLANATION OF SCHEMATIC.............................................................................7
3.1 T
YPICAL APPLICATION OF
MT6236..................................................................................................7
3.2 P
RINCIPLE OF
RF
CIRCUIT
...............................................................................................................8
3.2.1 GSM RF AD6548 application .................................................................................................8
3.2.2 Analog Front-end& Analog Blocks.........................................................................................9
3.3 P
RINCIPLE OF
P
OWER
M
ANAGEMENT CIRCUIT
..............................................................................16
3.3.1 Charger and protection logic .................................................................................................16
3.3.2 Power-on/off Sequence .........................................................................................................16
3.3.3 Battery Charging Circuit .......................................................................................................17
3.4 P
RINCIPLE OF
B
ASEBAND CIRCUIT
.................................................................................................21
3.4.1 Whole introduction of baseband circuit ................................................................................21
3.4.2 Memory Management ...........................................................................................................21
3.4.3 SIM Card interface................................................................................................................22
3.4.4 Audio frequency circuit.........................................................................................................24
3.4.5 LCD display circuit ...............................................................................................................28
3.4.6 T-Flash card circuit................................................................................................................29
3.4.7 5Pin System interface............................................................................................................29
3.4.8 FM radio circuit.....................................................................................................................30
3.4.9 Camera circuit .......................................................................................................................30
3.4.10 Bluetooth Circuit.................................................................................................................32
3.4.11 Vibrator circuit and G sensor...............................................................................................32
CHAPTER 4: FAILURE ANALYSIS .................................................................................................33
4.1 P
OWER ON PROBLEM
.....................................................................................................................34
4.2 D
ISPLAY PROBLEM
.........................................................................................................................35
4.3 C
HARGING PROBLEM
.....................................................................................................................35
4.4 V
OICE CAN NOT BE SENT OR RECEIVED
..........................................................................................35
4.5 N
O VOICE IN
S
PEAKER
...................................................................................................................36
4.6 T-F
LASH CARD FAILURE
................................................................................................................36
4.7 C
AN NOT DOWNLOAD SOFTWARE
..................................................................................................36
4.8 FM
RADIO FAILURE
.......................................................................................................................37
4.9 S
IGNAL PROBLEM
..........................................................................................................................37
CHAPTER 5: UPDATE MANUAL AND FAQ ..................................................................................37
5.1 P
REPARATIONS BEFORE
U
PDATE
....................................................................................................37