U8655
Maintenance Manual
9 Principles and Failure Analysis
Issue 1.0 (2012-02-23)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
25
Subsystem Module
Unit
Function
Speaker
Driver mode,
connection mode,
speaker component
Plays polyphonic ringtones for incoming calls.
The maximum power of the speaker is 500 mW.
It has good frequency response for playing
20–20000 Hz ringtones. It can also play
monophonic MP3 audio files.
Receiver
Driver mode,
connection mode,
receiver component
Emits sound during a call.
Microphone
Interface circuit,
connection mode,
microphone
component
The phone has two built-in microphones to
eliminate the environmental noise.
Earphone
Earphone, headset
interface circuit,
microphone interface
circuit
The phone provides a headset jack to output music
playback audio or voice during a call. The
microphone on the headset cable can pick sound and
input it into the phone. TheU8666 supports only the
LRGM headsets.
Vibration motor
interface
Driver mode,
connection mode,
motor
When there is an incoming call, the motor can
vibrate notify the user of the call.
NFC
I2C interface control
Performs proximity sensing function.
Proximity and
illuminance
sensor
I2C interface control
Senses the intensity of environmental light for
adjusting the LCD and keypad backlight brightness.
Detects the distance between the phone and the
user's skin and turns the LCD and touchscreen panel
off when the distance is smaller than the specified
value.
Compass
I2C interface control
Senses the magnetic field to help determining the
direction.
Accelerometer
I2C interface control
Senses acceleration to help implement game
functions.
Battery
Li-ion battery
3.7 V/1250 mAh (the battery must be certified and
comply with relevant safety regulations).
Power
supply
subsystem
External power
supply (travel
charger)
Adapter, and
interface component
The charger meets the requirements of China,
Europe, the USA, and Australia.
Charger specifications: 90–240 V, 45–55 Hz, AC
input. The model differs with different markets.
The output voltage of the charger is 5±0.25 V.The
charger must be CE and CCC certified.
The charger's output current must be able to charge
the battery and supply power to the phone for
normal operation at the same time.
