Gsm Receiver - Samsung SGH-j700 Service Manual

Flow Chart of Troubleshooting

9-11. GSM Receiver

RX ON
RF input : CH center freq : +67.7kHz
Cell Power : -60dBm
Yes
F100 Pin8
≥ -65dBm
Yes
F100 1,2
≥ -68dBm
Yes
L100 ≥ -70dBm
L103 ≥ -70dBm
Yes
U101 pin C2, B1,
B2, A1 ≥ 0.2Vp_p
Yes
Check UCP200
END
No
Resolder RFS100,C101,L107
No
No
Resolder L100, L101, L103
No
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Check F100
pin12,pin10 = L
Yes
oU101pin 16,17,29
32,36 ≥2.8V
pin10≥1.8V
Yes
9-26
No
Check ANT Switch
control circuit
Resolder F100
No
Check & Resolder
C118,C121,C123,R105
And PMU Part
Resolder U101