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Flow Chart of Troubleshooting
9-8
9-4. Microphone Part - Earphone MIC
Earphone MIC does not work
Yes
Not OK
Check the connection
of IFC300
Solder pin 3 of IFC300 again
Solder
R301,R329,R330,L316,
L317,
L301 and L302 again
Check the circuit
of EAR MIC
OK
Solder C302,C304 and R301 again and
check UCP200
Check MIC_BIAS.
( When UME300 operates
and call is connected )
OK
END
Not OK
Is Earphone MIC working?
Repeat the sequence
Yes
No
OK
Not OK