Samsung SGH-A500 Service Manual page 17

4. Charging Part
5. Microphone Part
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SGH-A500 Flow Chart of Troubleshooting and Circuit Diagrams
Abnormal charging part
check the pin #17,18
of CN303; -" TA+" is
>= 5V
Yes
No
Check the pin #4
of U601 ; low ?
Yes
Check the pin #3
of Q601 ; low?
Yes
Check the pin #5
of U602 ; 3.2V ~
4.2V ?
Yes
END
M icrophone does not
work
check the soldering
status of microphone
Yes
Check the
reference voltage
on mic path
C444 = 1.5V
Yes
Is microphone OK?
Yes
END
SAMSUNG Proprietary-Contents may change without notice
No
Replace TA & Check the
CN303
Check the U601
No
Check the Q601
No
Check the U602
No
Resolder microphone
Resolder or Change
No
C477,C478,R427
No
change microphone
6-3