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Flow Chart of Troubleshooting
9-14
9-8. Speaker Part
Check the supply voltage
of U500
Is the U503 =3.8V?
Speaker does not work
Is the U500 output
working?
Check R503, R505 Resolder R503, R505 or replace U500
END
No
Yes
No
Check the VBAT or replace U500
Yes
Check the signals of
speaker input
Check the circuit related to
melody signal
No signal
Is Speaker working?
No
OK
Change the Speaker
Yes
Yes