Level 3 Repair
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Confidential and proprietary-the contents in this service guide subject to change without prior notice.
8-107
Check L100 at sub b'd :
About 23dBm ?
8-3-40. LTE B3 TX
CONTINUOUS TX ON CONDITION
APPLIED
LTE Band8 CH : 21600
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
Check C100 at main b'd :
About 23dBm ?
Check L118 :
About 0dBm ?
Check C111 :
About 23dBm ?
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 ?
Resolder or change
OSC400
Resolder or change
U500
END
NO
YES
NO
YES
Check the voltage at C104=2.8V
if yes, resolder or change C111, F101
if no, resolder or change U400
CHECK soldered
Sub b'd L100, ANT100
Re-assembe coaxial cable or
Check solder state RFS100, RFS102, C100
Check the voltage at C110 > 1.0V
if yes, resolder or change L118, F100, PA103
if no, check solder state L302, U301, L301
