Table of Contents
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Flow Chart of Troubleshooting
7-6. Speaker Part(Melody)
Check the Clock signal at
Speaker does not work
Yes
U302 pin 5 = 2.9V?
Yes
Pin 1 of U305 (26MHz)
Yes
U300 pin 10, 11 ≒ 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
Resolder or replace U302
No
Check the clock generation circuit
(related to U102 and U305)
No
No
No
7-12
Resolder U300
Resolder CN700
Change the Speaker
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