Level 3 Repair
8-3-15. GSM1800 RX
NORMAL CONDITION
catch the channel?
Check C139 ≤ -65dBm ?
Check the Voltage at
C142 =VOUT_CHARGER
Check C143,L135
≥ -65dBm ?
Check component
soldering status OK at
F100
Check F100 PIN 18, 19
≥ -65dBm
Check the voltage at
{C169 = VBAT_RF ?}
& {C168 = 2.85V ?}
& {C164 = 2.65V ?}
& {C170 = 1.8V?}
& {C171 = 1.2V?}
Check the freq. at C158
: 26MHz ?
GSM1800 Receiver is O.K?
END
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NO
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
CHECK soldered
RFS100,L101,C139
Resolder or change
U106, C142
Resolder or change
C143,L135
Resolder or change
F100
Resolder or change
F100
Resolder or change
U101,C164,C168,C169,C170,C171
Change or resolder
OSC100
Resolder or change
UCP300
8-36
CONTINUOUS RX ON
RF INPUT : 698 CH
AMP : -50dBm