Level 3 Repair
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8-89
Check L100 at sub b'd :
About 30dBm ?
8-3-34. GSM850/GSM900 TX
Check C100 at main b'd :
About 30dBm ?
Check C136 :
About 0dBm ?
CHECK soldered
Sub b'd L100, ANT100
Re-assembe coaxial cable or
Check solder state RFS100, RFS102,
C100
Check the voltage at C107=V_BATTERY
if yes, resolder or change PA103, C136
if no, check solder state L102,C107,C108
Check L133 :
About 30dBm ?
Check the voltage at C104=2.8V
if yes, resolder or change 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 ?
Resolder or change
OSC400
Resolder or change
U500
END
NO
YES
NO
YES
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
