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7-6. Speaker Part(Melody)
Speaker does not work
Yes
U408 pin 5 = 1.9V?
Yes
Check the Clock signal
at
E2(CLKI) of
U406(13MHz)
Yes
R405 & R411 Around
U406 ≒ 1.8V?
(When U406 operate)
Yes
HEA1 pin 24,26
≒ 1.8V?
Yes
Is Speaker working?
Yes
END
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No
Resolder or replace U408
No
Check the clock generation circuit
(related to OSC101 and U406)
No
No
Check the circuit related to
No
7-13
Flow Chart of Troubleshooting
Resolder U406
"SPK_P/SPK_N" signal
Change the Speaker
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