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Level 3 Repair
8-42
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8-3-23. DCS/PCS TX
CONTINOUS TX ON CONDITION
TX POWER DAC:14500 CODE
APPLIED
DCS CH : 698
PCS CH : 661
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
F100 pin3:
about 30
dBm?
NO
NO
U300
check & change
C102 :
2.85V?
RFS100,
C100, L101
check &
change
C121, R103,R104, R105
change or resolder
YES
YES
YES
U300
{{C309 = 2.2V ?}
& {C316 = 1.3V ?}
& {C318 = 2.3V ?}
& {C320 = 1.4V ?}
END
U300
resolder or change
NO
Soldering state of U300 is O.K?
NO
OSC301
change or resolder
Check the freq. at
C303 :19.2MHz ?
U300
resolder or change
NO
YES
NO
U100
change or resolder
YES
NO
Check
DC bias
NO
C121 : about -5dBm
YES
R105 : about -5dBm
?
NO
C115 = 3.8~4.2V ?
FEM100
change or resolder
YES
YES
YES
L110
about : 30 dBm
Содержание GT-I5800
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