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Flow Chart of Troubleshooting
9-8
9-4. Microphone Part - Phone MIC
Phone mic. does not work
Yes
Not OK
Check the connection
from MIC
Resolder MIC
Yes
Replace the MIC
OK
Is Phone MIC working?
OK
Replace the MIC
Check the circuit
from CN301 pin 18,20
to MIC
Yes
Resolder R332, R334, R338, R341,
C346, C350, C354, C355, C358
Check the circuit
from UCP100(MSM6250)
to
CN301 pin 18,20
OK
END
Resolder U301
U301 pin 1 ≒ 1.8V?
( When UCP100 operate
and call is connected )
Not OK
No
Not OK
No