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Flow Chart of Troubleshooting
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7-11
6. Speaker Part(Melody)
U302 pin 5 = 2.9V?
Speaker does not work
Check the Clock signal at
Pin 1 of U300 (26MHz)
Check the clock generation circuit
(related to U101and U300)
No
Yes
No
Resolder or replace U303
Yes
U300 pin 17,18 ≒ 1.8V?
(When U300 operate)
Resolder U300
No
Yes
No
END
HDC800 pin 3,5 ≒ 1.8V?
(When U300 operate)
Change the board to board
FPCB
Is Speaker working?
Change the Speaker
No
Yes
Yes
Yes
CN701 pin 51,53 ≒ 1.8V?
(When U300 operate)
Resolder CN701
No
Yes