Block Diagram And Phone Introduction - Huawei U8860 Maintenance Manual

U8860
Maintenance Manual

9.1 Block Diagram and Phone Introduction

POWER
EXTERNAL
CHARGER
Interface
VBAT
CHARGE
SIDE KEY
PWR KEY
USIM
KEY BACK
LIGHT
STATUS
INDICATOR
FLASH
TF CARD
VIBRATOR
CAMERA*2
LCD
TP
USB
G SENSOR
GYROSCOPE
PROXIMITY
IIC Bus
AMBIENT
NFC
AMBIENT
COMPASS
MSM8255 is the baseband signal processing chip, mainly performing the signal input and
output of IMAGE, VIDEO, AUDIO, RF INTERFACES, CONECTIVITY. The baseband
interface provides interfaces of keypad, LCD, SD card, Bluetooth, camera, and MIC.
PM8058 provides analog multi-channel switch, real-time clock circuit, TCXO clock circuit,
motor driver circuit, and programmable current source.
The QTR8615 is the RF signal processing chip, performing the uplink and downlink RF
signal conversion.
According to logic functions, boards are categorized into four sub-systems, including
baseband, RF, power supply, and user interfaces. The following table describes modules and
units of each sub-system and supported functions.
Issue 1.0 (2011-11-14)
32.8
KHz
19.2MHz
OPT
Power
PM8058
Power
Power
IQ & control
MSM8255
MODE
JTAG
OPTION
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Copyright © Huawei Technologies Co., Ltd
Antenna switch
Matching Matching
GPA
GSM
UMTS
QTR8615
Interface
MIC*2
SPEAKER
RCVER
WIFI BT FM
IQ & control
Power
POP
eMMC
9 Principles and Troubleshooting
Main Antenna
Connector
Diversity Antenna
Duplexer Duplexer
Connector
Matching WPA
SAW
SAW
LNA
Matching
Filter
LNA
Filter
BCM4329
GPS Antenna
Antenna
switch
SAW
WLAN&BT Antenna
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