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Flow Chart of Troubleshooting
9-32
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9-2-11. UMTS1900 Receiver
**If you check the tx chain,
Check the not only RF Device but also resistor, inductor and capacitor.
Continuous RX ON
RF Input : 4408 CH
AMP : -40dBm
NORMAL
CONDITION
Catch the channel
?
YES
NO
Check L130
≥
-
55dBm ?
PAM201 Check
Pin #10
≥
-45dBm
?
U202 Check
Pin#26
≥
-65dBm ?
Check antenna contack
Replace RFS100
Replace PAM201
THE END
NO
NO
YES
YES
YES
Check the path from
F204 to U202
F204 Check
Pin #5
≥
-45dBm
?
F204 Resolder or change
NO
YES
NO
Resolder or replace C233 ,
C234 , C235 , C236
Check U203
U203 check
pin#7
freq = 19.2MHz
C233 , C234 , C235 ,
C236
≥
-65dBm?
YES
YES
NO
NO