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Flow Chart of Troubleshooting
10-8
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10-1-5. Receiver Part
10-1-6. SPK Part
There is no sound from the Receiver
Is the terminal of Receiver
O.K ?
No
Replace the Receiver
Yes
No
Yes
Check
U400,R413,R415
Is there any signals at the
pin#P11 and pin#R12 of
UCD300 ?
END
There is no sound from the Buzzer
Is the terminal of Speaker
O.K ?
Replace the Speaker
Is there any signals at the
pin#R13 and pin#R14 of
UCD300 ?
Check
UCD300
Check
D1, D2
(LCD PCB Part)
END
Yes
Yes
Yes
Yes
No
No