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