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SGH-E770 Flow Chart of Troubleshooting
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2-
9
2-1-4. Microphone Part
Micro-phone does not work
Is the assembled status of
Microphone O.K?
YES
Reassemble the microphone
NO
Check the DC bias voltage on
Mic path.
The voltage of TA434 is
about 2.2V±10%?
NO
Solder the microphone again
or Replace
TA434,C433,R433,R438,R437
Is microphone OK?
NO
Check UCP301
END
YES
YES