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Level 3 Repair
8-41
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8-3-22. GSM850/900 TX
C116,R100,R101,R102
change or resolder
RFS100,
C100, L101
check &
change
NO
NO
NO
YES
YES
NO
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
YES
YES
OSC301
change or resolder
Check the freq. at
C303 :19.2MHz ?
U300
resolder or change
NO
U100
change or resolder
NO
CONTINOUS TX ON CONDITION
TX POWER DAC:14500 CODE
APPLIED
GSM850 CH : 190
GSM900 CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
Check
DC bias
NO
C116= about -5dBm
?
YES
R102 = about -
5dBm ?
C115,
C118=3.8~4.2V ?
FEM100
change or resolder
YES
YES
YES
NO
NO
C119
about : 30 dBm
U300
check & change
C102 :
2.85V?
FEM100
pin3: about
30 dBm?
Summary of Contents for GT-I5800
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