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9-6. Speaker Part(Melody)
Check the Clock signal at
Speaker does not work
Yes
U304
pin 6 = 2.9V?
Yes
Pin 4 of
U304
(26MHz)
Yes
U301
pin 17,18 ≒ 1.8V?
(When U301 operate)
Yes
Is Speaker working?
Yes
END
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No
Resolder or replace U304
No
Check the clock generation circuit
(related to U301 and U303)
No
No
9-11
Flow Chart of Troubleshooting
Resolder U301
Change the Speaker
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