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Flow Chart of Troubleshooting and Circuit Diagrams
5-11
5-6 Speaker Part (Melody)
Speaker does not work
Yes
U300 pin 5 = 2.85V?
Resolder or replace U300
No
Yes
Check the clock signal at Pin1 of
U303 (13 MHZ) is OK?
No
Check the clock generation circuit
(related to U107 and U300)
Yes
Is Speaker working?
Change the Speaker
END
Yes
No
U303 pin 17, 18 1.8 V ?
CN700 pin 20, 21 1.8 V ?
Yes
Yes
No
No
Resolder U303
Check the circuit related to
"SPK_P/SPK_N" signal