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Flow Chart of Troubleshooting
7-6. Speaker Part
There is no sound from Speaker
No
Is the terminal of Speaker
Replace the Speaker
O.K.?
Yes
The type of sound
from the Speaker is
Melody
Yes
No
Are there any signals
Are there any signals
at the pin#5 and
at the pin#2 and
pin#7 of U502?
pin#10 of U502?
No
No
Yes
Yes
Yes
Yes
The pin#4 of
The pin#4 of
Check U502
U502 is
U502 is
"Low"
"High"
No
No
Check U502
Check U300
END
7-9
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