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Flow Chart of Troubleshooting
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10-
10
10-1-5. Speaker Part
Is the terminal of speaker O.K?
NO
Replace the speaker
Are there any signal
at the pin #5, 7 of U504?
NO
Check the LCD module
& Replace U504
There is no sound from speaker
YES
YES
The type of sound from
the speaker is Melody?
YES
NO
Are there any signal
at the pin #1,5 of U408?
Are there any signal
at the pin #3,15 of U408?
Check
U405,
U302,
U201
NO
NO
Pin #2 of U408
is Low?
Pin #4 of U201
is High?
NO
NO
YES
YES
YES
YES
END
Pin 8 of U303
is High?
Check U303
YES
NO
Check U302