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9-6. Speaker Part(Melody)
Speaker does not work
check the signal at Pin
A4,B4
Check the signal at
Pin
E4,E5
Is Speaker working?
Yes
of U400>1.3V
Yes
of
U400
Yes
Yes
END
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No
Resolder or replace
No
Resolder or replace
No
Change the Speaker
9-11
Flow Chart of Troubleshooting
C417,C419
U400
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