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Flow Chart of Troubleshooting
3-10
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3-1-5. Receiver Part
3-1-6. Speaker Part
There is no sound from the Receiver
Is the terminal of Receiver
O.K ?
No
Replace the Receiver
Yes
No
Yes
Check
UCP300
Check
V103,V104
(LCD PCB Part)
Is there any signals at the
pin#P11 and pin#N12 of
UCP300 ?
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#R12 and pin#P12 of
UCP300 ?
Check
U202,VR103,VR104
END
Yes
Yes
Yes
Yes
No
No