Samsung SGH-C140 Service Manual page 26

Flow Chart of Troubleshooting
3-2-2. DCS Rx
CONTINOUS RX ON
RF INPUT : 698CH
AMP : -50dbm
Normal condition
catch the channel ?
Yes
Check PAM400
pi n 12 ≥ -65
dbm ?
Yes
Check PAM400
pin 18 ≥ -65 dbm
?
Yes
Check U400
pin 19,20 ≥ -
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
F400, C310, C312, L304
Resolder or change
No
3-14
C303, R300
PAM400
UCP101
1
2
3
4
5