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SGH-X400 Flow Chart of Troubleshooting
12. DPCS transmitter
F1001 pin 10 :
about 2~3 dBm?
YES
CN1001, C1003
check&change
U1001
pin 3,6 : 3.7 V?
YES
U1001
pin 5 : 3V ?
YES
U1001 pin1
about : -5dBm
?
YES
U1001
change or resolder
NO
U902
pin9,10,12,13
U102 pin39, C112
:-20dBm ?
change or resolder
NO
U902
pin5,6,7,8 :1.7V ?
U701
U1001
change
change or resolder
NO
NO
F1001
pin 11, 5 : 2.8
V ?
YES
U1001 pin11
about 4~5dBm?
NO
YES
F1001
check & change
NO
BATTERY, U102
check & change
NO
U102 pin 37, C113
check or resolder
NO
U902
pin14,23,26,32 :
2.8V ?
YES
NO
U903
pin 5,25,28 :
3V ?
YES
YES
U903
pin 7 : 13MHz?
Vp-p: 860mV
YES
YES
U903
pin9,10,11,1213
: 3V?
YES
U902
change or resolder
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U703, U704
check & change
NO
U102 pin33, C111
change or resolder
NO
NO
U701
check or change
4-18
CONTINUOUS TX ON CONDITION
CH : 698CH(DCS),660CH(PCS)
TX POWER CODE: 350 CODE Aplied
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
NO
OSC801
OSC801
pin 3 : 13MHz?
change or resolder
Vp-p : 950mV
YES
NO
OSC801
U102 pin33, C111
pin 4 : 3V ?
change or resolder
YES
U903
change or resolder
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