Samsung i640 Service Manual - Page 90
ÁÊ. WÄÃMË ÅÁÂÂ Receiver
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Flow Chart of Troubleshooting 9-14. WCDMA 2100 Receiver RX ON Sector Power = -50dBm U100 pin11 >=-65dBm No Resolder RFS100, C104,L100,R100, C105 Yes No U100 pin9 >=-70 dBm Yes DUF100 pin2 No >=-75 dBm Yes No U101 pin26 >=-75 dBm Check U100 truth table No Yes Resolder or Change DUF100, L126,C171 Resolder or Change C174, L128 Yes U101 pin29 No >=-75 dBm Yes No U101 pin34,35 >-75dBm Yes Resolder or Change U101 Check C148, C153, L113, L116 F102, L114, C152, L115 Check U101 & UCP200 Pin#6: High Pin#5: Low Pin#4: High Check R106,R109, R118,UCP200 Resolder or Change U100 END 9-46 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
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SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
9-46
This Document can not be used without Samsung's authorization
9-ÁÊ. WÄÃMË ÅÁÂÂ Receiver
±X ON
sECto² PowE² = ³50dBm
U100 pIn11
>=³65dBm
±E´oldE²
±Fs100,
µ104,L100,±100, µ105
U100 pIn¸
>=³70 dBm
No
YE´
No
µhECk
U100 t²uth
tablE
µhECk
±106,±10¸,
±11·,UµP200
No
±E´oldE² o²
µhangE U100
±E´oldE² o² µhangE
DUF100, L126,µ171
YE´
No
YE´
µhECk U101 & UµP200
µhECk
µ14·, µ153, L113, L116
F102, L114, µ152, L115
¶ND
DUF100 pIn2
>=³75 dBm
YE´
No
No
U101 pIn26
>=³75 dBm
YE´
U101 pIn2¸
>=³75 dBm
YE´
U101 pIn34,35
>³75dBm
YE´
±E´oldE² o² µhangE
µ174, L12·
No
±E´oldE² o² µhangE
U101
Pin#6: High
Pin#5: Low
Pin#4: High