Microphone Part; Receiver Part - Samsung SGH-B100 Service Manual

10-1-5. Microphone Part

Microphone does not work
Is the soldered status of
microphone O.K?
Check the reference voltage on mic path
C419 ≒ 2.0V ?
Is microphone ok?
END

10-1-6. Receiver Part

There is no sound from the Receiver
Is the terminal of
Receiver O.K ?
Is there any signals at
the pin# P11 and
pin#N12 of UCP300 ?
Is there any signals at
the pin# 3 and pin# 9 of
U401 ?
END
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Yes
No
Yes
Yes
No
Yes
No
Yes
Yes
No
①
Yes
Yes
Yes
10-11
Reassemble the microphone
Resolder or change
R405,R406,R407,R408,R409,R410,R411,
VR402,VR403,C417,C418
Check UCP300
Replace the Receiver
No
Check UCP300,R417,R418
No
Check U401
Flow Chart of Troubleshooting