Gsm Transmitter - Samsung SGH-E330 Service Manual

F low Chart of Troubleshooting

13. GSM Transmitter

TXO N (5L evel)
Y es
U 103 Pin7
>= 20dBm
N o
U 103 pin11
>= 20dBm
N o
U 102 pin6
>= 20dBm
N o
U 102 pin48
>= 3dBm
N o
O SC 101 pin1
>= 6dBm
N o
U 100 pin6, 7, 8, 9
>= 500m V
N o
C heck U 200
E N D
Y es
R esolder C N 100, C 144
Y es
Y es
R esolder L 113,L 114,C 151
Y es
Y es
Y es
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C heck U 103
pin4 = H(2.68V ),
pin2,8 = L
N o
Y es
C h eckU 102
V B A T T , p in 42,43
O K ?
N o
R esolder R 123
C heck U 100 N o
pin4 >= 4.0V
pin22,28 >=2.7V
O K ?
Y es
7- 20
Y es
C hange or R esolder U 100
C heck A N T Switch
control circuit
R esolder or C hange U 102
or check PA Mcontrol signal
C heck +V BA TT
C heck &R esolder
R F PSU Part
R esolder U 100
or check Txcpo(R 114)