Level 3 Repair
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8-73
Check C117
≤
-65dBm ?
8-3-22. WCDMA Band5 / GSM 850 RX
NORMAL CONDITION
catch the channel?
Check the voltage at
{C148= VOUT_CHARGER ?}
& {C158,C159, C160
= VOUT_CHARGER?}
& {C147, C172 = 2.85V ?}
& {C144, C170 = 2.65V ?}
& {C146, C174 = 1.8V?}
& {C173, C171, C145 = 1.2V?}
Check the Voltage at
C110 = VBATT ?
Check component
soldering status OK at
F100
CHECK soldered
RFS100, L109, C116, C117
Resolder or change
U103, C110
Resolder or change
F100
Resolder or change
U108
Check the freq. at
OSC100 PIN 1 : 26MHz ?
Change or resolder
OSC100
Check C115, L112
≥
-65dBm ?
Resolder or change
C115, L112
WCDMA band5/GSM850
Receiver is O.K?
Resolder or change
UCP300
END
NO
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Check F100 PIN 20, 21
≥
-65dBm
Resolder or change
F100
NO
YES
CONTINUOUS RX ON
RF INPUT : 4408CH
AMP : -50dBm