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Flow Chart of Troubleshooting
9-10
9-6. Speaker Part(Melody)
Speaker does not work
Check the signal at
Pin D4,E4 of
U401
> 1.3V
Resolder the
C407
,
C408
Yes
No
Yes
END
Is Speaker working?
Change the Speaker
No
Yes
Check the signal at
Pin OUTL, OUTR of
U401
Resolder or replace
U401
Yes
No