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Flow Chart of Troubleshooting
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9-17
9-6. Speaker Part(Melody)
Speaker does not work
Is the terminal of speaker
OK?
check the specker
No
Yes
END
U403 pin B4 = 2.9V?
Resolder or replace U403
No
Yes
Check the Clock signal at
Pin D2 of U101 (26MHz)
Yes
Resolder U403
Yes
HDC601 pin 6,7 ≒ 2.9V?
(When U403 operate)
No
No
Resolder HDC601
Is speaker OK?
No
Change speaker
Yes
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