Samsung SGH-C140 Service Manual page 24

Flow Chart of Troubleshooting
3-2. RF
3-2-1. GSM Rx
CONTINOUS RX ON
RF INPUT : 62CH
AMP : -50dbm
Normal condition
catch the channel ?
Yes
Check PAM400
pi n 12 ≥ -65
dbm ?
Yes
Check PAM400
pin 16 ≥ -65 dbm
?
Yes
Check U400
pin 21,22 ≥ -
65dBm ?
Yes
Check U400
pin 13 = 2.9V
Yes
Resolder or change
UCP201
No
Check ANT,
No
Resolder or change
RFS400, L300, L301, L303, C305, C302
No
Resolder or change
No
Resolder or change
F401, C319, U409, L306
No
Resolder or change
3-12
C303, R300
PAM400
UCP101
1
2
3
4
5