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Flow Chart of Troubleshooting
6. Speaker Part(Melody)
Speaker does not work
Yes
U302 pin 6 = 2.9V?
Yes
Check the Clock signal at
Pin 1 of U300 (26MHz)
Yes
U300 pin 17,18 ≒ 1.8V?
(When U300 operate)
Yes
CN700 pin 23,25 ≒ 1.8V?
(When U300 operate)
Yes
Is Speaker working?
Yes
END
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No
No
Check the clock generation circuit
No
No
No
7-14
Resolder or replace U302
(related to U100and U300)
Resolder U300
Resolder CN700
Change the Speaker
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