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9-1-6. Speaker Part
Speaker does not work
U402
U402
Is there any signal at
C1(EAR2) & C2(EAR1)
Is there any signal at
B5(OUT+) & D5(OUT-)
Is Speaker working?
Yes
B1
= 3.7V?
Yes
D1 , D2
= 'H'?
Yes
?
Yes
?
Yes
Yes
END
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No
Resolder or replace U402
No
Resolder or replace UCP300
No
Resolder or replace UCP300
No
Resolder or replace U402
No
Change the Speaker
9-13
Flow Chart of Troubleshooting
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