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Level 3 Repair
8-40
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Check L103
≤
-65dBm ?
8-3-15. GSM1800, GSM1900 RX
NORMAL CONDITION
catch the channel?
CHECK soldered
RFS100, L103,L104,C112
NO
YES
NO
Check the voltage at
{C316 = 2.2V?}
{C319,C320,C322,C323,C3
26,C327,C330,C333=1.3V?
}
resolder or change
U501
Check the freq. at
OSC500 : 19.2MHz ?
change or resolder
OSC500
GSM1800/1900 Receiver is O.K?
resolder or change
U300
END
NO
NO
YES
NO
YES
YES
Check the Voltage at
C111 =2.8V
resolder or change
U501
Check
L112,L113,
L114,L115
≥
-65dBm ?
NO
YES
NO
YES
resolder or change
F100,L112,L113,L114,L115