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