Samsung SGH-X300 Service Manual page 16

Samsung mobile phone service manual
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SGH-X300 Flow Chart of Troubleshooting
2-2. RF
2-2-1. GSM Rx
CONTINOUS RX ON
RF INPUT : 62CH
AMP : -50dbm
Normal condition
catch the
channel ?
Yes
Check U102
pin 12 ¡ Ã
-65
dbm ?
Yes
Check U102
pin 16 ¡ Ã
dbm ?
Yes
Check U101
pin 21,22 ¡ Ã -
65dBm ?
Yes
Check U101
pin 13 = 2.9V
Yes
Resolder or change
U300
-65
No
Check ANT,
No
Resolder or change
CN100, L101, L102, C100, C105, C106
No
Resolder or change
No
Resolder or change
No
Resolder or change
2-12
R101,R102,C104,L102
U102
F100
U200
1
2
3
4
5

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