Level 3 Repair
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Confidential and proprietary-the contents in this service guide subject to change without prior notice.
8-101
Check L100 at sub b'd :
About 23dBm ?
8-3-38. WCDMA900 / LTE B8 TX
Check C100 at main b'd :
About 23dBm ?
Check C123 :
About 0dBm ?
CHECK soldered
Sub b'd L100, ANT100
Check L127 :
About 23dBm ?
Check the voltage at C104=2.8V
if yes, resolder or change L127, F101
if no, resolder or change U400
YES
NO
YES
NO
YES
NO
YES
NO
Check the voltage at
C303 = 2.0V
&
C320 = 1.8V
&
C302 = 1.3V
Resolder or change
U400
Check the freq. at
OSC400 PIN 1 :
19.2MHz ?
Change or resolder
OSC400
Resolder or change
U500
END
NO
YES
NO
YES
CONTINUOUS TX ON CONDITION
TX POWER IDX1 APPLIED
WCDMA900 CH : 2788
LTE Band 8 CH : 21625
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
Re-assembe coaxial cable or
Check solder state RFS100, RFS102, C100
Check the voltage at C110 > 1.0V
if yes, resolder or change C123, L125, F102, PA103
if no, check solder state L302, U301, L301
