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SGH-E880 Flow Chart of Troubleshooting
2-
20
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2-2-4. EGSM TX
F700 pin #10 =
about 2~3 dBm
C725,CN700
check&change
F700
pin #11 = 2.8V
U100
check & change
U701 pin#1 =
about 4~5dBm?
F700
check & change
The voltage of
C714
≥
3.7v
NO
NO
YES
YES
YES
NO
NO
BATTERY
check & change
U701
pin #20 = 1.2V
YES
NO
U701 pin#4 =
about -5dBm
YES
U701
pin #18 = 3V &
pin #1 is "Low"
YES
YES
U701
change or resolder
NO
U100
check
U701
check
NO
U700
pin9,32 = 2.8V
U100 pinA13
change or resolder
YES
U700
pin#8 : 13MHz &
Vp-p : 950mV?
U700
pin#4,#5,#6,#7
= 1.5V
YES
U100
change or resolder
NO
NO
U700
change or resolder
YES
NO
OSC700
change or resolder
CONTINOUS TX ON CONDITION
TX POWER DAC: 500 CODE APPLIED
CH : 30
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB