Sharp SGH-J200 - Manual (Page 39)

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Flow Chart of Troubleshooting
9-8
9-5. Microphone Part - Phone MIC
Check the connection
from MIC
Check the circuit
from UCP300 to MIC
Resolder MIC
Resolder the R507, R509, R513, R514
END
Not OK
Yes
OK
OK
OK
Not OK
Check the MIC
Not OK
Replace the MIC
Microphone does not work