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Flow Chart of Troubleshooting
7-6. Speaker Part(Melody)
Speaker does not work
Y e s
U512 pin 5 = 2.85V?
Y e s
Check the Clock signal
at
pin1(CLKI) of
U502(13MHz)
Y e s
C514 & C515 Around
U502 ¡ Ö 1.8V ?
(When U502 operate)
Y e s
is Speaker Contact in
proper position?
Y e s
Is Speaker working ?
Y e s
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
7- 12
Resolder U502
Change the Speaker
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