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Flow Chart of Troubleshooting
9-10
9-4. Microphone Part - Earphone MIC
Check MIC_BIAS
( When UCP200 operates
and call is connected )
Phone MIC does not work
END
Yes
Is EarPhone MIC
Working?
Yes
No
Repeat the sequence
Yes
Check the connection of
IFC500
No
Resolder pin 3, 4 of IFC500
Yes
No
Resolder TA400, R400, R404 and
check UCP200
Resolder C501~C505, R501, R502, R504,
L500 and L501
No
Check the circuit
of EAR MIC
Yes