Samsung SGH-T429 Service Manual - Page 56
DCS Transmitter
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Flow Chart of Troubleshooting 9-15. DCS Transmitter TX ON (5Level) Yes F100 Pin7 >= 20dBm Yes F100 pin3 >= 18dBm Yes PAM100 pin15 >= 18dBm Yes PAM100 pin3 =2.8V RF PSU Part Yes Resolder U101 9-24 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-24
9-15. DCS Transmitter
U101
pin12,13,28,29
>=2.8V
Yes
Resolder U101
Check
UCP200
END
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Check & Resolder RFLO
signal, RF13MHz,
RF PSU Part
Check +VBAT or PAM
control signal
Resolder or Change
Pam100
Check Pam100
+VBATT(pin17)
Yes
U101
pin 4,5,6,7
>= 1V
Resolder
R103
Resolder
L112, C117
Check ANT Switch
control circuit
Change or Resolder
L112,C117,C118
PAM100
pin3
<= -11dBm
PAM100
pin3
<=
-15dB
PAM100
pin15
>= 18dBm
F100
pin3
>= 18dBm
Check F100
pin9
= H (2.6V),
pin11
=L
TX ON (5Level)
Resolder
CN100,C104
F100
Pin7
>= 20dBm