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Flow Chart of Troubleshooting
9-6. Speaker Part(Melody)
Speaker does not work
U602 pin G8 and pin H1
Check the Clock signal at
U602 pin C6, B6 ≒
(When UCP300 operate)
Check the signals of
Is Speaker working?
)
Yes
= 2.7V?
Yes
Pin G5 of U602
(19.2MHz)
Yes
1.8V?
Yes
speaker input
OK
Yes
END
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No
Resolder or replace U602
No
Check the clock generation circuit
(related to U602 and U603)
No
Resolder UCP300
No signal
Check the circuit related to
melody signal
No
Change the Speaker
9-10
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