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SGH-X400 Flow Chart of Troubleshooting
10. DCS Reciever
NORMAL CONDITION
catch the channel?
YES
F1001 1CHECK
pin5 ≥ -65dBm ?
YES
F1001 CHECK
pin3, 4 ≥ -65dBm ?
YES
U902 CHECK
pin19,20 ≥ -65dBm ?
YES
U902
pin 12,13≥
-20dBm ?
YES
U902 CHECK
pin 14,23,26,32:
clean 2.8V?
YES
U902 pin3,4
Vp-p : 240mV?
YES
U902 pin1, 2
Vp-p : 250mV ?
YES
U901 pin 2,3,4,5
Vp-p : 100mV ?
YES
NO
CHECK
L1001,L1002,L1005 contact ?
NO
CN1001
resolder or change
NO
F1001
resolder or change
NO
L1003, C1005, C1006
resolder or change
NO
U903 CHECK
pin 25,28 : 3V ?
YES
U903 CHECK
pin 7 : 13MHz ?
Vp-p : 860mV?
YES
U903 change or
resolder
NO
U102 pin39, C112
check or resolder
NO
U901 CHECK
pin6, 20 : 2.8V ?
YES
U901
resolder or change
NO
U902
resolder or change
NO
CHECK
U701
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CONTINUOUS RX ON
RF INPUT : 698CH
AMP : -50dBm
NO
U102 pin33 , C111
check or resolder
NO
OSC801 CHECK
pin 3 : 13MHz ?
Vp-p : 950mV?
YES
C1063, R804
resolder
NO
4-16
NO
NO
OSC801 CHECK
pin 4 : clean 3V ?
YES
0SC801 change or
resolder
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