SAMSUNG Proprietary-Contents may change without notice
4-
14
SGH-X400 Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
F1001 CHECK
pin15 ≥ -65dBm ?
8. EGSM Reciever
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -60dBm
NORMAL
CONDITION
catch the channel?
CHECK
L1001, L1002, L1005
contact ?
U902
pin 12,13≥
-20dBm ?
F1001 CHECK
pin1, 2 ≥ -65dBm ?
U902 CHECK
pin21,22 ≥ -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
pin4:clean 3V?
U903 change or
resolder
U902 CHECK
pin
14,23,26,32:
clean 2.8V?
C1063, R804
resolder
OSC801
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 :
