Samsung i640 Service Manual - Page 75
GSM Receiver
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Flow Chart of Troubleshooting 9-8. GSM Receiver RX ON Sector Power = -50dBm No U100 pin11 >=-60dBm Yes U100 pin23,24 No >=-70 dBm Resolder RFS100, C104,L100,R100, C105 Check U100 truth table No Yes Pin#6: Low Pin#5: Low Pin#4: Low Check R106,R109, R118,UCP200 Resolder or Change U100 Yes No U101 pin32,33 >=-75 dBm Resolder or Change L108,L111,L112 Yes Check U101 & UCP200 END 9-31 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
9-31
This Document can not be used without Samsung's authorization
9-8. GSM Receiver
±X ON
sECto² PowE² = ³50dBm
U100 pIn11
>=³60dBm
U100 pIn23,24
>=³70 dBm
No
YE´
No
µhECk
U100 t²uth
tablE
No
YE´
µhECk U101 & UµP200
¶ND
YE´
U101 pIn32,33
>=³75 dBm
YE´
±E´oldE² o² µhangE
L10·,L111,L112
No
Pin#6: Low
Pin#5: Low
Pin#4: Low
±E´oldE²
±Fs100,
µ104,L100,±100,
µ105
µhECk
±106,±10¸,
±11·,UµP200
±E´oldE² o²
µhangE U100