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Check Flow
Start
Insert the earphone to
the phone
Earphone detect problem
Dose the
audio profile of
No
phone change to the
earphone mode
Yes
Set the audio part of
the test equipment to
Audio path problem
echo mode
No
Can you hear your voice
from the earphone?
Yes
Earphone receiving path problem
Download
software
Voltage at C209 ,C217
2
=1.2V?
Earphone detect problem
Unsheathe
earphone
Voltage at R230=0.7V?
Yes
Voltage at Pin 4 of
U200=2.4V?
Yes
Voltage at pin 1 of
U200=0?
Yes
Insert earphone
Change the earphone
and try again
1
Can you hear your voice
from the earphone?
Yes
Charge
earphone
Earphone will work
properly
C209,C217,R210,R228
No
Yes
C209,C217,R210,R228
Check soldering
1
R201，R230
No
Voltage at C206=2.3V？
Yes
Replace J200
Replace U200
Replace J200
No
Voltage at pin 4 of
U200=0？
Set the audio part
of the test
equipment to PRBS or
continuous wave mode
No
Can you hear your voice
from the earphone?
3
4
Re-solder
No
Check soldering
Yes
No
Yes
No
Yes
25
4. TROUBLE SHOOTING
Earphone receiving path
problem
No
Yes
Earphone sending path
problem
Replaee
4
main board
Check soldering
R202，R204
Replace U200
No
Voltage at pin 1 of
U200=2.8V？
Yes
Replace
4
main board
2
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