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Flow Chart of Troubleshooting
9-10
9-5. Microphone Part - Earphone MIC
Earphone mic. does not work
Yes
Not OK
Check the connection
from IFC300
Resolder IFC300 pin 3,4
Yes
Check UCP100
Is Earphone MIC working?
OK
Yes
Resolder C344, C349, C357
R333, R335, R339, R340
Check the circuit
from UCP100 to
IFC301 pin 3,4
OK
END
Resolder U301
U301 pin 1 ≒ 1.8V?
( When UCP100 operate
and call is connected )
No
Not OK
No