Dcs/Pcs Tx - Samsung SM-T311 Service Manual

Level 3 Repair

8-3-18. DCS/PCS TX

F100 PIN11 : About
27dBm ?
Check the Voltage at
C102 = 2.85V ?
Check L133, C137 :
About 27dBm ?
Check the Voltage at
R106,C135=VOUT_CHARGER?
Check C124, L111 :
About -4dBm ?
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 ?
DCS/PCS Transmitter is O.K?
END
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YES
NO
NO
YES
YES
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NO
YES
YES
YES
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YES
NO
CHECK soldered
- RFS101,C112,L107,L103,C108,
- C190,L134,C104,ANT102,C110,
L105
Resolder or change
F100, C102
Resolder or change
L133, ,C137
Resolder or change
PAM100, R106, C135
Resolder or change
C124, L111
Resolder or change
U104
Change or resolder
OSC100
Resolder or change
UCP300
8-58
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