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Flow Chart of Troubleshooting
7-6
4. Speaker Part (Melody)
U602 pin6,28 = 2.8V?
Speaker does not work
Check the Clock signal at
Pin 2 of U602
(19.2MHz)
Check the clock generation circuit
(related to U502 and U602)
END
No
Yes
No
Resolder or replace U605
U602 pin 3 ≒ 2.8V?
(When U501 operate)
Resolder U501
Yes
No
U602 pin 23
≒ Battery Volt ?
Check the circuit related to
"AMP1_IN/AMP2_IN" signal
Yes
No
Is Speaker working?
No
Yes
Change the Speaker
Yes
Yes