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Level 3 Repair
8-42
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Check L121
≤
-65dBm ?
8-3-15. GSM1800, GSM1900 RX
Check the voltage at
{C318,C319=2.2V ?}
&
{C321,C322,C324,C325,C3
26,C327=1.3V ?}
resolder or change
U502
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
L103,L127,L132,L133
≥
-65dBm ?
NO
YES
resolder or change
FEM100,L103,L127,L132,L133
NORMAL CONDITION
catch the channel?
Check the Voltage at
L135 = 2.6V
CHECK soldered
RFS100,L101,L121,C107,C159
resolder or change
L135, U502
NO
YES
NO
NO
YES
