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Flow Chart of Troubleshooting
9-9
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9-1-4. Speaker Part (Melody)
No sound from Speaker
YES
NO
NO
Check UCP310
Is there any signal
at L503, L504?
R506 is high?
YES
Check U500 (Power on)
YES
Is there voice signal
at pin #5, #10 of U501?
Check U501
NO
YES
NO
Is there signal at SPK
soldering pad?
YES
Change the Speaker
NO
Is the terminal of SPK OK?
(Wire/Soldering)
Check LCD module
YES
END