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Flow Chart of Troubleshooting
9-8
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9-1-5. Receiver Part
9-1-6. Speaker Part
Yes
END
①
There is no sound from the Buzzer
Is the terminal of Speaker
O.K ?
Replace the Speaker
Yes
Yes
No
Is there any signals at the
Pin#J6 & J7 of U405 ?
No
Yes
Check
U405
Check
U404
No
Yes
Is there any signals at
the pin#3 and pin#9 of
U403 ?
Check
U403
END
No
Are there any signals at
the L401, L402
②
③
④
There is no sound from the Receiver
Is the terminal of Receiver
O.K ?
No
Replace the Receiver
Yes
No
Check
U100,R420,R425,U403
Is there any signals at
the pin#P11 and
pin#N12 of U100 ?
Yes