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F low Chart of Troubleshooting
6. Speaker Part(Melody)
Speaker does not work
Y es
N o
U 302 pin 6 = 2.9V ?
R esolder or replace U 302
Y es
N o
C heck the C lock signal at
C heck the clock generation circuit
Pin 1 of U 300 (26M H z)
(related to U 100and U 300)
Y es
N o
U 300 pin 17,18 ¡Ö1.8V ?
R esolder U 300
(W hen U 300 operate)
Y es
N o
C N 700 pin 23,25 ¡Ö1.8V ?
R esolder C N 700
(W hen U 300 operate)
Y es
N o
Is Speaker working?
C hange the Speaker
Y es
E N D
7- 14
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