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