Gsm850/Gsm900 Tx - Samsung GT-I9300 Service Manual

8-3-24. GSM850/GSM900 TX

U103 PIN14 : About
30dBm ?
Check the Voltage at
C110 = VBATT ?
Check C124, C120, L114
: About 30dBm ?
Check the Voltage at
C125,C129,C132
Check C136
About 0dBm ?
Check the voltage at
{C148= VOUT_CHARGER ?}
& {C158,C159, C160
= VOUT_CHARGER?}
& {C147, C172 = 2.85V ?}
& {C144, C170 = 2.65V ?}
& {C146, C174 = 1.8V?}
& {C173, C171, C145 = 1.2V?}
Check the freq. at
OSC100 PIN 1 : 26MHz ?
GSM850/900 Transmitter is O.K?
END
Confidential and proprietary-the contents in this service guide subject to change without prior notice.
Distribution, transmission, or infringement of any content or data from this document without Samsung's written authorization is strictly prohibited.
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
CHECK soldered
- RFS100, L109, C116, C117,
C191, C101, L103, L102,
ANT103
Resolder or change
U103, C110
Resolder or change
C124, C120, L114
Resolder or change
U106,C125,C129,C132
Resolder or change
C136
Resolder or change
U108
Change or resolder
OSC100
Resolder or change
UCP300
8-77
Level 3 Repair
CONTINUOUS TX ON CONDITION
TX POWER IDX1 APPLIED
GSM850 CH : 190
GSM900 CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB