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Flow Chart of Troubleshooting
7-
12
7-6. Speaker Part(Melody)
U801 pin 5 = 2.85V?
Speaker does not work
Check the Clock signal
at
pin1(CLKI) of
U800(13MHz)
Check the clock generation circuit
(related to OSC101 and U800)
END
No
Yes
No
Resolder or replace U801
C808 & C809 Around
U502 ≒ 1.8V?
(When U800 operate)
Resolder U800
Yes
No
is Speaker Contact in
proper position?
Check the speaker Contact
Yes
No
Is Speaker working?
No
Yes
Change the Speaker
Yes
Yes