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Flow Chart of Troubleshooting
9-6. Speaker Part(Melody)
Speaker does not work
U400pin 13~16 = 4.2V?
Check the signal at
Pin D405,D406 of U400
PIN 4 of U400
(AMP_EN) ≒ H ?
Check all power source
related UCD401 Does it
work correctly?
Check pin 36,35 at
UCD401 Is there singal?
Is Speaker working?
Yes
Yes
Yes
Yes
Yes
Yes
Yes
END
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No
Resolder or replace U400
No
Check the R407 if there is no
signal,resolder or replace U400
No
Resolder U400 and check
related circuit
No
Resolder UCD401
No
Resolder UCD401
No
Change the Speaker
9-14
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