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Flow Chart of Troubleshooting
10-11
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10-1-5. Microphone Part
10-1-6. Receiver Part
Is the soldered status of
microphone O.K?
Microphone does not work
Reassemble the microphone
Resolder or change
R405,R406,R407,R408,R409,R410,R411,
VR402,VR403,C417,C418
END
No
Yes
Yes
Yes
Yes
No
Is microphone ok?
No
Check
UCP300
Check the reference voltage on mic path
C419
≒
2.0V ?
Yes
There is no sound from the Receiver
Is the terminal of
Receiver O.K ?
No
Replace the Receiver
Yes
No
Yes
Check
UCP300,R417,R418
Is there any signals at
the pin# P11 and
pin#N12 of UCP300 ?
END
Yes
Is there any signals at
the pin# 3 and pin# 9 of
U401 ?
Check
U401
No
Yes
①