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Flow Chart of Troubleshooting
7-8
7-4. Speaker Part(Melody)
Yes
Yes
Change the Speaker
Yes
No
Is Speaker working?
No
Yes
Check the circuit related to
"SPOUT1/SPOUT2" signal
U603 pin 14,23
≒ Battery Volt ?
No
Yes
Resolder U302
U603 pin 3 ≒ 2.6V?
(When U302 operate)
Resolder or replace U602
No
Yes
No
END
Check the clock generation circuit
(related to U401 and U603)
Check the Clock signal
at Pin 2 of U603
(19.2MHz)
Speaker does not work
U603 pin28,29 = 3.0V?