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SGH-X450 Flow Chart of Troubleshooting
7-10
8. EGSM transmitter
U201 pin#8 :
about 2~3 dBm?
CON1, C215
check&change
U201
pin#11 : 3 V?
U500,U501
check & change
C210
≒ 4~5dBm?
U200
check & change
C207 : 3.7 V?
NO
NO
YES
YES
YES
NO
NO
BATTERY, U300
check & change
Between
R201 & U200 :
1.2V?
YES
NO
R201
check & change
R204 :
≒ -5dBm ?
YES
YES
U200
change
U500
check & change
YES
NO
U100 pin#9
: 3V ?
U300 pin#39
change or resolder
YES
U100
pin#5,6,7,8 :1.7V
?
YES
U500
change
NO
NO
U100
change or resolder
YES
U100
pin#8 : 13MHz?
Vp-p: 950mV
U100
pin#10,12,13,14
: 3V?
YES
OSC100
pin#3 : 13MHz?
Vp-p : 950mV
OSC100
change or resolder
U500
check or change
0SC100
pin#4 : 3V ?
U300 pin#39
change or resolder
U300
change or resolder
NO
NO
YES
NO
YES
NO
CONTINUS TX ON CONDITION
TX POWER DAC:500 CODE APPLIED
CH:62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
NO