Gsm Receiver - Samsung SGH-E330N Service Manual

7-12. GSM Receiver

RX ON
RF input : CH center freq
Amp : -50dBm
Y e s
U103 Pin7
> = -65dBm
Y e s
U103 pin5
> = -65dBm
Y e s
F100 pin1
> = -70dBm
Y e s
U100
pin32 > = -70dBm
pin33 > = -70dBm
Y e s
U100 pin6 , 7 , 8 , 9
> = 1V
Y e s
R116 , R117 , R119
R121 > = 1V
Y e s
Check U706
END
No
Resolder CN502, C144
No
No
Resolder F100, C104, L103
No
Resolder L100, L101, L102
No
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Check U103
pin4 = L , pin8 = L
Y e s
Check U100
pin10 , 2 2 , 2 8 > = 2 .7V
pin20 > = 4 .0V
Y e s
7- 19
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Resolder U103
No
Check & Resolder
RF PSU Part
Check & R esolder
U100, RF26MHz part,
R100 , R101