Flow Chart of Troubleshooting
9-6. Speaker Part(Melody)
Speaker does not work
Yes
No
U601
pin 7 = 2.9V?
Resolder or replace U601
Yes
No
Check the signal at
Resolder the C634, C635
Pin 8, 9 of
U601
> 1.3V
Yes
No
Check the signal at
Resolder or replace U601
Pin 15, 17 of
U601
Yes
No
Is Speaker working?
Change the Speaker
Yes
END
9-11
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