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Flow Chart of Troubleshooting
9-16
9-2.RF
9-2-1. GSM850 Receiver
**If you check the tx chain,
Check not only
the
RF Device
,
but also
the
resistor,
the
inductor and
the
capacitor.
Continuous RX ON
RF Input : 190 CH
AMP : -50dBm
NORMAL CONDITION
Catch the channel ?
YES
NO
Check F101 #17pin
≥
-
55dBm ?
PAM100 Check
Pin #13
≥
-55dBm ?
U103 Check
Pin#19, 20
≥
-
60dBm ?
Check antenna contact
Resolder C120
PAM100 Resolder or Change
THE END
NO
NO
YES
YES
YES
Resolder
C121, C122, L106 or
Change U102
NO