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Level 3 Repair
8-44
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8-3-24. WCDMA Band1 TX
CONTINOUS TX ON CONDITION
TX POWER DAC:120 CODE APPLIED
CH : 10700
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
F100 pin3:
about 20
dBm?
NO
FEM100
change or resolder
Check DC bias
PAM100
resolder or change
C137,C138,L116,F102
resolder or change
U300
resolder or change
OSC301
resolder or change
NO
NO
NO
NO
YES
NO
YES
YES
U300
{{C309 = 2.2V ?}
& {C316 = 1.3V ?}
& {C318 = 2.3V ?}
& {C320 = 1.4V ?}
END
U300
resolder or change
Soldering state of U300 is O.K?
YES
Check the freq. at
C303 :19.2MHz ?
YES
YES
C137: about : about
-5dBm
PAM100 pin 7
about : -5dBm ?
NO
C128,C130 =
3.8~4.2V ?
YES
YES
YES
NO
NO
L115
about : 20 dBm
U300
check & change
C102 :
2.85V?
RFS100, C100,
L101
check & change
Содержание GT-I5800
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