Gsm Receiver - Samsung SGH-G400 Service Manual

Flow Chart of Troubleshooting

9-10. GSM Receiver

RX ON
RF input : 62CH
Cell Power : -50 dBm
Yes
C134 ≥ -65dBm
Yes
C134 > 2.5V
C165 > 1.5V
C166 < 0.5V
C174 > 1.5V
Yes
L105 ≥ -68dBm
Yes
U101 PIN
11,12,13,14 ≥
500mV
Yes
Check UCP300
END
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CONTINUOUS RX on
RF input : 62CH
Cell power : -50dBm
No
Resolder RFS101
No
Check UCP301
No
Resolder or Change MOD101
No
Check U101
9-20