Microphone Part - Samsung SGH-M300 Service Manual

Flow Chart of Troubleshooting

3-1-4. Microphone Part

Microphone does not work
Is the assembled status of
Check the reference voltage on mic path
Yes
microphone O.K?
Yes
Yes
VR401 ≒ 2.0V ?
Yes
Is microphone ok?
Yes
END
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No
Reassembled the microphone
Resolder or change
R411,R414,C413,C414,C418,C420
No
C421,R422,C415,C419,R416,R419
R415,R420
No
Check UCP301
3-10
①
②