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Flow Chart of Troubleshooting
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9-13
9-6. Speaker Part(Melody)
Speaker does not work
Yes
U601 pin 7 = 2.9V?
Resolder or replace U601
No
Yes
No
Resolder HCD500
HCD500 pin 2,3 ≒ 1.8V?
(When U601 operate)
Yes
Resolder of change the Speaker
Is the Speaker working?
END
No
Yes
No
Resolder U601
U601 pin 15,17 ≒ 1.8V
(When U601 operating)
Yes
No
Yes
Check the clock generation circuit
(related to U101 and TCX100)
Check the Clock signal at
Pin 1 of TCX100(26MHz)
L104 pin 1, 2 ≒ 1.8V
No
Resolder or change L104
Содержание SGH-E740S
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