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