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