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SGH-X481 Flow Chart of Troubleshooting
2-19
2-2-4. GSM Tx
Check U801
pin 15 : about
2~3 dbm?
Check U801
pin 6 : 2.8V ?
Check and
change
CON901
,
C904
Yes
Check and
change
U100
,
U600
No
CONTINUS TX ON CONDITION
TX POWER DAC : 554 CODE
APPLIED
CH : 62ch
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV : 10dBm
ATT : 20dB
U900 pin 11 :
about 4~5dbm?
Yes
No
Yes
U900 pin 7 :
3.7V ?
U801
check & change
No
Battery,
U100
check & change
Yes
U900 pin 8 :
1.2V ?
No
U100
check
Yes
U900 pin 6 :
3V ?
No
U100
check
U801 pin 12,13,
28,29 : 2.9V ?
U900
change or resolder
U100
change or resolder
No
Yes
U801
change or resolder
Yes
U900 pin 12
:
about -5dbm?
No
Yes
No
1
2
3
4
4
4
4
3
Summary of Contents for SGH-X481
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