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Flow Chart of Troubleshooting
9-16
9-2-3. PCS Rx
Normal condition
catch the channel ?
Check U101
pin 12
≥
-65
dbm ?
Check U100
pin 17,18
≥
-
65dBm ?
Yes
No
No
Check U101
pin 20
≥
-65 dbm
?
Yes
No
Yes
Check ANT,
C403, C402, C405, R406
Resolder or change
RFS400, L405, L403, C404, L402
Resolder or change
U401
Resolder or change
F403, C423, C424,L409
Resolder or change
UCP200
CONTINOUS RX ON
RF INPUT : 660CH
AMP : -50dbm
Check U100
pin 13 = 2.9V
Yes
Resolder or change
U100
Yes
No
No
1
2
3
4
5