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7-6. Speaker Part(Melody)
Check the Clock signal at
Speaker does not work
Yes
U302 pin 6 = 2.9V?
Yes
Pin 1 of U300 (26MHz)
Yes
U300 pin 17,18 ¡ Ö 1.8V ?
(When U300 operate)
Yes
CN700 pin 23,25 ¡ Ö 1.8V ?
(When U300 operate)
Yes
Is Speaker working ?
Yes
END
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No
Resolder or replace U302
No
Check the clock generation circuit
(related to U100and U300)
No
No
No
7-15
Flow Chart of Troubleshooting
Resolder U300
Resolder CN700
Change the Speaker
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