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Flow Chart of Troubleshooting and Circuit Diagrams
3-16
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3-1-6. Speaker Part
No sound on Speaker
END
Check the Speaker Terminal
NO
Is the signal at pin#4
of U904 ?
YES
Is the terminal of speaker
OK?
No signal at pin#9,12
of U904 ?
Check the UCP300
No signal at pin#10
of U611 ?
No signal at pin#2,3
of U904 ?
Is there signal at the pin#4
or 8 of U611 ?
The sound on speaker is
from Keyton or Melody ?
YES
YES
YES
YES
Keytone
YES
Resolder or change U904
NO
Resolder or change U605
NO
Resolder or change U904
NO
Resolder or change UCP300
NO
Melody
Is there signal at Pin#5
of U611 ?
Resolder or change U600
Resolder or change U611
NO
YES
NO
