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SGH-X140 Flow Chart of Troubleshooting
2-2-3. EGSM TX
U402 pin 13 :
about 2~3
dBm?
YES
C407,U401
check&change
U403
pin5 : 3.7 V?
U403
pin 4 : 1.6V ?
U403 pin1
NO
about : -5dBm
?
U403
pin 6 : 3V?
U403
change or resolder
NO
U101 pinA13,C111
change or resolder
This Document can not be used without Samsung's authorization
NO
U402
pin1 : 2.8 V?
YES
U403 pin14 :
about 4~5dBm?
NO
YES
U402
check & change
NO
BATTERY
check & change
YES
NO
U101
check
YES
YES
NO
YES
U101
check
U404
pin9,32 : 2.8V ?
YES
U404
pin8 : 13MHz ?
Vp-p : 950mV?
YES
NO
U404
pin4,5,6,7:100m
V?
YES
U101
change or resolder
U404
change or resolder
SAMSUNG Proprietary-Contents may change without notice
NO
U101
check & change
NO
OSC401
change or resolder
2-12
CONTINOUS TX ON CONDITION
TX POWER DAC: 600 CODE APPLIED
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
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