Sharp SGH-F250 - Manual (Page 52)

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Flow Chart of Troubleshooting
9-24
9-12. GSM Receiver
RX ON
Cell Power : -60dBm
MODULE100 Pin13≥
-65dBm
Yes
Resolder
MODULE100,C102,L102
No
Yes
No
Check MODULE100
pin9,pin11 = L
MODULE100 1,2
≥ -68dBm
Check ANT Switch
control circuit
No
Yes
Resolder MODULE100 Yes
U100
pin C7 ≥ -70dBm
pin B7 ≥ -70dBm Resolder L110, L111, L112
No
U100 pin
G4,F3,D6,C5,B3,A5,
F1 29,32,33,36 ≥
2.8V
pin C1 ≥2.9V
Yes
U100 pin
C2,B1,B2,A1
≥ 0.2Vp_p
Check & Resolder
C115,C116,C117,C114
And PMU Part
No
No
Yes
Yes
Resolder U100
Check UCP200
END
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