Table of Contents
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Flow Chart of Troubleshooting
9-6. Speaker Part(Melody)
Speaker does not work
Yes
No
Resolder or replace U403
U403 pin B4 = 2.9V?
Yes
No
U403 pin E2, E4 ≒ 1.8V?
Resolder or replace U403
Yes
No
U402 pin 3, 9 ≒ 1.8V?
Resolder U402
(When U403 operate)
Yes
No
Speaker is working?
Change the Speaker
Yes
END
9-11
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