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Flow Chart of Troubleshooting
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2-18
- Speaker
There is no sound from Speaker
END
YES
YES
The pin #4, #8 of U405
are logic high
YES
Are there any signal at the
pin #3, #9 of U405
YES
Check U403
NO
Are there any signal at the
pin #9, #12 of U403
NO
Is the terminal of Speaker O.K?
Replace the Speaker.
NO
Check UCP200
Check U405
Replace or Resoldering
R420, R421, R432,
R433, C440, C441.
NO
NO
Are there any signal at the
R432, R433,
YES
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