Level 3 Repair
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8-46
Check C112
≤
-65dBm ?
8-3-12. GSM1800 RX
NORMAL CONDITION
catch the channel?
Check the voltage at
{C147 = VOUT_CHARGER ?}
& {C157, C159
= VOUT_CHARGER?}
& {C146 = 2.85V ?}
& {C141= 2.65V ?}
& {C68 = 1.8V?}
& {C144= 1.2V?}
Check the Voltage at
C102 = 2.85V?
Check component
soldering status OK at
F101
CHECK soldered
RFS101, L107,C112
Resolder or change
F100, C102
Resolder or change
F101
Resolder or change
U104
Check the freq. at
OSC100 pin3: 26MHz ?
Change or resolder
OSC100
Check L111,L112
≥
-65dBm ?
Resolder or change
L111,L112
GSM1800 Receiver is O.K?
Resolder or change
UCP300
END
NO
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Check F101 PIN 18, 19
≥
-65dBm
Resolder or change
F101
NO
YES