Gsm850/Gsm900 Tx - Samsung GT-N7000 Service Manual

Level 3 Repair

8-3-17. GSM850/GSM900 TX

U1002 PIN14 : About
30dBm ?
Check the Voltage at
C1026 = V_BAT?
Check L1018, L1033,
L1019 : About 30dBm ?
Check the Voltage at
C1040 =V_BAT ?
Check C1049: About
0dBm ?
Check the voltage at
{C1062 = VBAT_RF ?}
& {C1000,C100 = V_BAT?}
& {C1061, C1021 = 2.85V ?}
& {C1056, C1016 = 2.65V ?}
& {C1060, C1017 = 1.8V?}
& {C1059, C1022, C1024) =
1.2V?}
Check the freq. at
C1048 : 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
- RFS1001, C1030, L1016
L1001, C1018, C1019, RFS1000
Resolder or change
U1002, C1026
Resolder or change
L1018, L1033, L1019
Resolder or change
U1005, C1040
Resolder or change
C1049
Resolder or change
U1000
Change or resolder
OSC1000
Resolder or change
U300
8-54
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