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Flow Chart of Troubleshooting and Circuit Diagrams
3-24
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3-2-2. DCS Rx
Continuous RX ON
Check pin #12 of
U100
≥
-65dBm
Check pin #22,23 of
U101
≥
-65dBm
Check pin #16,17,33 of
U101
≥
2.9V
Check the pin #34,35 of U101=
26Mhz
Check the pin #4,5,6,7 of U101
Vp-p=100mV
END
Resolder or Change
RFS100,L100,L101,C107
Resolder or Change U100
Check soldered status of
C119,C120,L105
Check or Resolder BTC400,C426
Resolder or Change OSC100
Resolder or Change U101
Normal Condition Catch the
channel
Check pin #19 of
U100
≥
-65dBm
GSM Receiver is O.K?
GSM RX path component
resolder or change
Check soldered status of
C101,L103,L101,L100,C107
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
