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Flow Chart of Troubleshooting
10-8
10-5. 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 L403, L404, C410, C418 and
C423 again
Check the circuit
of EAR MIC
OK
OK
Solder C316 again and check PMU300
Check MIC_BIAS_2.15V
( When U200 operates
and call is connected )
OK
END
Solder IFC500, L500, L501 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
