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Flow Chart of Troubleshooting
10-11
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10-1-5. Microphone Part
Micro-phone does not work
Is the connection status of
HDC300 O.K?
YES
Reconnect connector of HDC300
NO
Check the DC bias voltage on
Mic path.
The voltage of C406 is
about 2.2V±10%?
NO
Solder the microphone again
or Replace
R406, R415, R418, R425
Is microphone OK?
NO
Check UCD301
END
YES
YES
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