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Flow Chart of Troubleshooting
9-28
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9-2-7. UMTS2100 Receiver
**If you check the tx chain,
Check the not only RF Device but also resistor, inductor and capacitor.
Continuous RX ON
RF Input : 10700 CH
AMP : -40dBm
NORMAL
CONDITION
Catch the channel
?
YES
NO
Check L100
≥
-
55dBm ?
PAM100 Check
Pin #10
≥
-45dBm
?
U201 Check
Pin#26
≥
-65dBm ?
Check antenna contack
Replace RFS100
Replace PAM100
THE END
NO
NO
YES
YES
YES
Check the path from
DUF200 to U201
DUF200 Check
Pin #5
≥
-45dBm
?
DUF200 Resolder or
change
NO
YES
NO
Resolder or replace C240 ,
C248 , C241 , C243
Check TCX100
U201 check
pin#7
freq = 19.2MHz
C240 , C248 , C241 ,
C243
≥
-65dBm?
YES
YES
NO
NO