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SAMSUNG Proprietary-Contents may change without notice
Level 3 Repair
8-49
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Check C115
≤
-65dBm ?
8-3-18. WCDMA Band8 / GSM900 RX
CONTINUOUS RX ON
RF INPUT : 9800CH
AMP : -50dBm
NORMAL CONDITION
catch the channel?
CHECK soldered
RFS100, L102,C115,C104
NO
YES
NO
Check the voltage at
{C324,L300,L301 = V_BAT ?}
& {L103,C317,C318,C319= 1.8V?}
Check the voltage at
{R106 = VBAT ?}
& {C158, C160 = 1.8V ?}
& {C161,151,C152,C153,
C154,C155,C157=2.85?}
resolder or change
U105
resolder or change
UCP300
Check the freq. at C185
: 26MHz ?
change or resolder
OSC100
GSM900/BAND8 Receiver is O.K?
resolder or change
UCP300
END
NO
YES
NO
YES
NO
YES
NO
YES
Check the voltage at
{C188 = RF_VDD_MAIN?}
resolder or change
U108,U101,
C186,C188,C125,C124,R103,L106
NO
YES
Check the Voltage at
C130 =V_BAT
resolder or change
U102,C129,C130,C131,C134
Check L108,L109
≥
-65dBm ?
resolder or change
L108,L109
NO
YES
NO
YES
Check L103,L104,C110
≥
-65dBm ?
resolder or change
F107,L103,L104,C110
NO
YES
Check C112,C114,L101
≥
-65dBm ?
resolder or change
F100,U100
NO
YES