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Flow Chart of Troubleshooting
10-
16
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- Speaker
There is no sound from Speaker
END
YES
YES
The pin #2 & #7 of U501
are logic high
YES
Are there any signal at the
pin #2, #10 of u501
YES
Check UCD500
NO
Are there any signal at the
pin #15, #16 of UCD500
NO
Is the terminal of Speaker O.K?
Replace the Speaker.
NO
Check UCP203
Check U501
Are there any signal at the
pin #12, #9 of U500
YES
NO
Replace or Resoldering
L501,L502,C502,C505,R
504,C507
NO
Check U500
NO
Are there any signal at the
R504,C505
YES