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Flow Chart of Troubleshooting
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7-11
6. Speaker Part(Melody)
U303 pin 5 = 2.85V?
Speaker does not work
Check the Clock signal at
Pin 1 of U304 (13MHz)
Check the clock generation circuit
(related to OSC101and U304)
No
Yes
No
Resolder or replace U303
Yes
U304 pin 17,18 ≒ 1.8V?
(When U304 operate)
Resolder U304
No
Yes
No
END
CN601 pin 2,4 ≒ 1.8V?
(When U303 operate)
Change the board to board
FPCB
Is Speaker working?
Change the Speaker
No
Yes
Yes
Yes
CN502 pin 48,50 ≒ 1.8V?
(When U304 operate)
Resolder CN502
No
Yes