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Flow Chart of Troubleshooting
9-12
9-5. Microphone Part
Microphone does not work
Yes
Resolder MIC
Check the connection
from MIC
No
Yes
Check the path from Main IC to MIC
Check the circuit
from UCD300 to MIC
No
Yes
Replace the MIC
Check the MIC
No
Yes
END
On booting,
VAMICREF
≒
2.5V ?
Yes
No
Check UCD300