Samsung SGH-A737 Service Manual page 64

Flow Chart of Troubleshooting
9-2-9. UMTS850 Receiver
**If you check the tx chain,
Check the not only RF Device but also resistor, inductor and capacitor.
Continuous RX ON
RF Input : 9800 CH
AMP : -40dBm
NORMAL
CONDITION
Catch the channel
?
YES
Check L130 ≥ -
55dBm ?
YES
PAM201 Check
Pin #10 ≥ -45dBm ?
YES
F203 Check
Pin #5 ≥ -45dBm
?
YES
U201 Check
Pin#26 ≥ -65dBm ?
YES
C231 , C232 ≥ -
U203 check
pin#7 freq = 19.2MHz
THE END
NO
NO
NO
NO
NO
65dBm?
YES
YES
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Check antenna contack
Replace RFS100
Replace PAM201
F203 Resolder or change
Check the path from
F203 to U201
NO
Resolder or replace
C231 , C232
NO
Check U203
9-30