Flow Chart of Troubleshooting
10-11
10-2. RF
10-2-1. GSM Rx
Normal condition
catch the
channel ?
Check PAM100
pin 12
≥
-65
dbm ?
Check UCD101
pin 21,22
≥
-
65dBm ?
Yes
No
No
Check PAM100
pin 16
≥
-65
dbm ?
Yes
No
Yes
Check ANT,
C104,C126,L102,L113
Resolder or change
RFS100,C102,C199,L100,L101,L111
Resolder or change
PAM100
Resolder or change
F101,C105,C109,L104
Resolder or change
UCP201
CONTINOUS RX ON
RF INPUT : 62CH
AMP : -50dbm
Check UCD101
pin 13 = 2.9V
Yes
Resolder or change
UCD107
Yes
No
No
1
2
3
4
5