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Flow Chart of Troubleshooting
9-8
9-5. Microphone Part - Earphone MIC
Earphone MIC does not work
Yes
Not OK
Check the connection
of IFC500
Solder pin 3, 4 of IFC500 again
Solder L501, L502, C407, C408,
C413 and R418 again
Check the circuit
of EAR MIC
OK
OK
Solder R325 again and check U300
Check MIC_BIAS_2.15V
( When UCP200 operates
and call is connected )
OK
END
Solder IFC500, R505 again
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