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Flow Chart of Troubleshooting
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9-11
9-6. Earphone Part
Earphone does not work
Yes
Not OK
Solder pin 5,6 of IFC400
, L408, L409 again
Check the circuit
of IFC400
OK
Check the voltages of
R422, R423, R424, R438
and R449 are 2.9V
Not OK
Solder R422, R423, R424, R438 and
R449 again
OK
Not OK
Check the circuit
U401
Check R444
No
Check UCP200 or Change UCP200
OK
Is JACK_INT signal
LOW?
(When UCP200 operates)
No
Solder R427 again
Ok
Not OK
Check EAR SW
END
Solder U404 again
Yes