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13. GSM Transmitter
TXO N (5L evel)
Y es
M O D U L E 1 Pin8
>= 20dBm
Y es
M O D U L E 1 pin11
>= 18dBm
Y es
U 101 pin8
>= 18dBm
Y es
U 101 pin7
<= -11dB m
Y es
U 101 pin7
<= -15dB m
Y es
U 100 pin
H 8,J 8,H 7,J 7
>= 1V
Y es
C heck U 200
E N D
N o
R esolder C N 100, C 102
N o
N o
R esolder C 113, C 107, C 112
N o
N o
R esolder R 106, R 107,
N o
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C heck M O D U L E 1
pin10 = H(2.68V ),
pin9,12 = L
Y es
N o
C heck U 101
pin 5, O K ?
Y es
R 108, R 109
R 110, C 126, C 129
N o
>=2.7V
O K ?
Y es
7- 25
F low Chart of Troubleshooting
N o
C heck A N T Switch
control circuit
C hange or R esolder
M O D U L E 1
R esolder or C hange U 101
C heck +V BA T or PA M
control signal
C heck &R esolder R FL O
signal, R F13M H z,
R F PSU Part
R esolder U 100
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