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7-4. Speaker Part(Melody)
Speaker does not work
Yes
U600 pin7,32 = 2.7V?
Yes
Check the Clock signal
at Pin 1 of U600
(13.5MHz)
Yes
U600 pin 4 ≒ 2.7V?
(When u100 operate)
Yes
Is Speaker working?
Yes
END
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No
Resolder or replace U401
No
Check the clock generation circuit
(related to U401 and U600)
No
No
7-11
Flow Chart of Troubleshooting
Resolder u100
Change the Speaker
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