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Checking Flow
START
Resolder J200
Does the audio
profile of the phone
change to the
earphone mode?
YES
Set the audio part of the test
Equipment to echo mode
NO
Can you hear your
voice from
the earphone?
YES
Earphone will work properly
NO
NO
Level at pin1
of U201 is high
YES
Set the audio part of
the test equipment to
Change the earphone
PRBS or continuous
and try again
Can you hear your
voice from
the earphone?
YES
Download software.
Change earphone
YES
Does it work well?
Change the main board.
- 83 -
4. TROUBLE SHOOTING
Replace U201
Resolder component
Download software
wave mode
No
Can you hear
the sound from
the earphone?
YES
YES
Check soldering
Change the main board.
NO
Voltage at
C209
=1.2V ?
C209
R210
YES
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