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Flow Chart of Troubleshooting
9-1-8. Headset Part
Earphone does not work
Is there any signal at
U302 R300,
Is there any signal at
U302
IFC400
Is there any signal at
IFC400
Is Earphone working?
Yes
R301?
Yes
J7, H8
?
Yes
pin 5,6,7
short?
Yes
pin 5, 7
?
Yes
Yes
END
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No
Resolder or replace U302
No
Resolder the
or Check the UCP200
No
Resolder or replace IFC400
No
Resolder the L415,
No
Replace the earphone
9-14
C323, C325
L416
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