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SGH-E310 Flow Chart of Troubleshooting and Circuit Diagrams
2-
13
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3. EGSM TX
F900 pin 13 :
about 2~3 dBm?
F901, C900,L905
check&change
F900
pin1 : 2.8 V?
U702,U703
check & change
U900 pin12 :
about 4~5dBm?
F900
check & change
U900
pin8,20 : 3.7 V?
NO
NO
YES
YES
YES
NO
NO
BATTERY, U102
check & change
U900
pin 22 : 1.6V ?
YES
NO
U900 pin6
about : -5dBm ?
YES
U900
pin 2 : 3V?
YES
YES
U900
change or resolder
NO
U701
check
U701
check
NO
U800
pin9,32 : 2.8V ?
U102 pin39, C112
change or resolder
YES
U800
pin8 : 13MHz ?
Vp-p : 950mV?
U800
pin4,5,6,7:100mV?
YES
U701
change or resolder
NO
NO
U800
change or resolder
YES
NO
OSC801
change or resolder
CONTINUS TX ON CONDITION
TX POWER DAC: 600 CODE APPLIED
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
