Gsm850/Gsm900 Tx - Samsung GT-N8000 Servise Manual

Level 3 Repair

8-3-20. GSM850/GSM900 TX

U106 PIN14 : About
30dBm ?
Check the Voltage at
C134 = VOUT_CHARGER?
Check L119,C144,L120 :
About 30dBm ?
Check the Voltage at
C150 = OUT_CHARGER?
Check C162 :
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 ?
GSM850/900 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
L119,C144,L120
Resolder or change
U108,C150,C153,C154
Resolder or change
C162
Resolder or change
U101,C164,C168,C169,C170,C171
Change or resolder
OSC100
Resolder or change
UCP300
8-46
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