Gsm Receiver - Samsung SGH-D500 Service Manual

F low Chart of Troubleshooting

12. GSM Receiver

R XO N
R Fin p u t : C Hcen ter freq: +67.7k H z
A m p: -50d B m
Y es
U 100 Pin7
>= -65dB m
Y es
U 100 pin5
>= -65dB m
Y es
F100 pin1
>= -67dB m
Y es
U 102
pin29 >= -70dBm
pin30 >= -70dBm
Y es
U 102 pin7, 8, 9, 10
>= 1V
Y es
R 112, R 113, R 114,
R 115 >= 1V
Y es
C heck U 200
E N D
N o
R esolder R FS100, C 102
N o
N o
R esolder F100, C 104, L 102
N o
R esolder C 103, C 105, L 101
N o
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C heck U 100
pin2,pin4,pin8 = L
Y es
C heck U 102
pin 23,26,31 >=2.7V
Y es
7- 23
N o
C heck A N T Switch
control circuit
R esolder U 100
N o
C heck &R esolder
U 102, R 103, R 104
R F26M H z, R F PSU Part
R esolder U 102