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Flow Chart of Troubleshooting
9-5. Microphone Part - Earphone MIC
Earphone MIC does not work
Check the connection
Check JACK IN is low
when ear jack is inserted.
Check MIC_BIAS_2.15V
( When UCP200 operates
and call is connected )
Is Earphone MIC working?
Yes
of IFC500
OK
OK
OK
Check the circuit
of EAR MIC
OK
Yes
END
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Not OK
Solder pin 3, 4 of IFC500 again
Not OK
Solder IFC500, R506 again
Not OK
Solder C330 again and check U300
Not OK
Solder C407, R401, R407 and C419
Repeat the sequence
No
9-8
again
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