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Flow Chart of Troubleshooting
9-14
9-2-2. DCS Rx
Normal condition
catch the channel ?
Check U401
pin 12
≥
-65
dbm ?
Check U400
pin 19,20
≥
-
65dBm ?
Yes
No
No
Check U401
pin 18
≥
-65 dbm
?
Yes
No
Yes
Check ANT,
C403, C402, C405, R406
Resolder or change
RFS400, L405, L403, C404, L402
Resolder or change
U400
Resolder or change
F402, C421, C422, L408
Resolder or change
UCP200
CONTINOUS RX ON
RF INPUT : 698CH
AMP : -50dbm
Check U400
pin 13 = 2.9V
Yes
Resolder or change
U100
Yes
No
No
1
2
3
4
5