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Flow Chart of Troubleshooting
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9-9
9-5. Microphone Part - Earphone MIC
Earphone MIC does not work
Yes
Not OK
Check the connection
of IFC600
Resolder pin 3, 4 of IFC600
Resolder L600, L601, L602, L604,
C613, C617, and U601
Check the circuit
of EAR MIC
OK
OK
Resolder R607, R608, R614, and
R616 again and check U402, U601
Check MIC_BIAS_2.15V
( When UCP200 operates
and call is connected )
OK
END
Resolder IFC600, R601
Check
JACK IN is low
when ear jack is inserted.
Not OK
Not OK
Is Earphone MIC working?
Repeat the sequence
Yes
No
OK
Not OK