Microphone Part-Phone Mic - Samsung SGH-Z240 Service Manual

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