U9200 Maintenance Manual
INTERNAL
(2012-06-13)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Page 43 of 80
Subsystem Module
Unit
Function
Antenna
External antenna,
internal interface,
and antenna
protection
The U9200 provides a built-in
antenna supporting WCDMA at
high and low frequency bands. The
U9200 provides a main antenna and
Wi-Fi/Bluetooth/GPS antennas.
User
interface
subsystem
UART
connector
The UART1 port is connected to
MODEM, UART2 connected to
BT&GPS, UART3 connected to
commissioning equipment, UART4
connected to audio noise reduction
chip ES305.
USB
connector
Driver, protective
circuit, and output
interface
Indicates the USB peripheral
circuit, protective circuit, and
interface connector in the AP,
MODEM, and MHL subsystems.
The module is also the main data
channel of the engineering sample,
which is used for device debugging
and testing.
USIM
connector
Power supply,
protective circuit,
and USIM socket
USIM card holder and the
corresponding link circuit.
Keypad and
backlight
Keypad drive
circuit, external
keypad, LED
backlight control
circuit
The volume keys are monitored
with the interrupted monitoring
method through GPIO. When users
press the volume key, the two top
view LED backlights are on.
Color LCD
and backlight
LCD driver,
interface mode, and
backlight control
Main display, 16000000 colors.
T-FLASH
card
Power supply,
protective circuit,
and connector
TFLASH card connector and
related interface circuit
Speaker
Drive mode,
connection mode,
and speaker-related
components
The speaker is used to play chord
ringing when a call is set up, whose
power is up to 500 MW. The good
frequency response enables it to
play 20 Hz – 20 kHz music. It can
also serve as the mono speaker for
MP3.
receiver
Drive mode,
connection mode,
and receiver-related
components
Earpiece during a call with a power
lower than 30 MW.
