FLYE185Service Manual
CKT Confidential Page 2 of 47
CONTENT
CHAPTER 1: SUMMARY....................................................................................................................4
CHAPTER 2: PCBAOVERVIEW.......................................................................................................5
2.1 TOP SIDE..........................................................................................................................................5
2.2 BOTTOM SIDE ..................................................................................................................................6
CHAPTER 3: EXPLANATION OF SCHEMATIC.............................................................................7
3.1 TYPICAL APPLICATION OF MT6236..................................................................................................7
3.2 PRINCIPLE OF RF CIRCUIT ...............................................................................................................8
3.2.1 GSM RF AD6548 application .................................................................................................8
3.2.2 Analog Front-end& Analog Blocks.........................................................................................9
3.3 PRINCIPLE OF POWER MANAGEMENT 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 PRINCIPLE OF BASEBAND 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: FAILUREANALYSIS.................................................................................................33
4.1 POWER ON PROBLEM .....................................................................................................................34
4.2 DISPLAY PROBLEM.........................................................................................................................35
4.3 CHARGING PROBLEM.....................................................................................................................35
4.4 VOICE CAN NOT BE SENT OR RECEIVED..........................................................................................35
4.5 NO VOICE IN SPEAKER...................................................................................................................36
4.6 T-FLASH CARD FAILURE ................................................................................................................36
4.7 CAN NOT DOWNLOAD SOFTWARE ..................................................................................................36
4.8 FM RADIO FAILURE .......................................................................................................................37
4.9 SIGNAL PROBLEM ..........................................................................................................................37
CHAPTER 5: UPDATE MANUALAND FAQ..................................................................................37
5.1 PREPARATIONS BEFORE UPDATE ....................................................................................................37
