Flow Chart of Troubleshooting
10-1-5. Microphone Part
Is the connection status of
HDC300 O.K?
YES
Check the DC bias voltage on
Mic path.
The voltage of C406 is about 2.2V±10%?
YES
Is microphone OK?
YES
END
NO
NO
NO
①
Reconnect connector of HDC300
②
Solder the microphone again or Replace
R406, R415, R418, R425
Check UCD301
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