Wcdma Band8 Tx - Samsung SM-T311 Service Manual

8-3-22. WCDMA BAND8 TX

Check U101 PIN11 :
About 22 dBm ?
Check the Voltage at
C102 = 2.85V ?
Check C126 :
About 22dBm ?
Check component
soldering status OK at
Check L121 :
About 22dBm ?
Check the Voltage at
R106,C135=VOUT_CHARGER?
Check C139 : About
0dBm ?
Check the voltage at
{C147 = VOUT_CHARGER ?}
& {C157, C159
= VOUT_CHARGER?}
& {C146 = 2.85V ?}
& {C141= 2.65V ?}
& {C168 = 1.8V?}
& {C144= 1.2V?}
Check the freq. at
OSC100 pin3: 26MHz ?
WCDMA band8 Transmitter is O.K?
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YES
NO
NO
YES
YES
NO
NO
F101
YES
YES
NO
NO
YES
YES
YES
YES
NO
YES
NO
END
CHECK soldered
- RFS101,C112,L107,L103,C108,
- C190,L134,C104,ANT102,C110,
L105
Resolder or change
F100,C102
Resolder or change
C126
Resolder or change
F101
Resolder or change
L121
Resolder or change
PAM100, R106,C135
Resolder or change
C139
NO
Resolder or change
U104
Change or resolder
OSC100
Resolder or change
UCP300
8-67
Level 3 Repair
CONTINOUS TX ON CONDITION
TX POWER DAC:14500 CODE
APPLIED
WCDMA Band2 CH : 3013
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB