Dcs/Pcs Tx - Samsung GT-N8000 Servise Manual

Level 3 Repair

8-3-21. DCS/PCS TX

U106 PIN14 : About
30dBm ?
Check the Voltage at
C142 = VOUT_CHARGER?
Check C146,C145,C147
:About 30dBm ?
Check the Voltage at
C150 = OUT_CHARGER?
Check C196,L134 :
About 0dBm ?
Check the voltage at
{C169 = VBAT_RF ?}
& {C168 = 2.85V ?}
& {C164 = 2.65V ?}
& {C170 = 1.8V?}
& {C171 = 1.2V?}
Check the freq. at C158
: 26MHz ?
DCS/PCS Transmitter is O.K?
END
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YES
NO
NO
YES
YES
NO
NO
YES
YES
YES
NO
YES
NO
YES
NO
CHECK soldered
RFS100,C139,L101,C138,L112
C137,L111,C141,C2107,ANT103
Resolder or change
U106, C142
Resolder or change
C146,C145,C147
Resolder or change
U108,C150,C153,C154
Resolder or change
C196,L134
Resolder or change
U101,C164,C168,C169,C170,C171
Change or resolder
OSC100
Resolder or change
UCP300
8-48
CONTINOUS TX ON CONDITION
TX POWER DAC:14500 CODE
APPLIED
DCS CH : 685
PCS CH : 661
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB