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Flow Chart of Troubleshooting
9-6. Speaker Part(Melody)
Speaker does not work
Yes
U512 pin 5 = 2.85V?
Yes
Check the Clock signal
at
pin1(CLKI) of
U502(13MHz)
Yes
C514 & C515 Around
U502 ≒ 1.8V?
(When U502 operate)
Yes
is Speaker Contact in
proper position?
Yes
Is Speaker working?
Yes
END
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No
Resolder or replace U512
No
Check the clock generation circuit
(related to OSC101 and U502)
No
No
Check the speaker Contact
No
9-12
Resolder U502
Change the Speaker
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