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Flow Chart of Troubleshooting and Circuit Diagrams
3-2-3. PCS Rx
Continuous RX ON
RF Input : 660CH
Normal Condition Catch the
Check pin #12 of
U100 ≥ -65dBm
Check pin #21 of
Check pin #20,21 of
U101 ≥ -65dBm
Check pin #16,17,33 of
Check the pin #34,35 of U101=
Check the pin #4,5,6,7 of U101
GSM Receiver is O.K?
AMP : -50dBm
YES
channel
YES
YES
U100 ≥ -65dBm
YES
YES
U101 ≥ 2.9V
YES
26Mhz
YES
Vp-p=100mV
YES
YES
END
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Check soldered status of
NO
C101,L103,L101,L100,C107
NO
Resolder or Change
RFS100,L100,L101,C107
NO
Resolder or Change U100
NO
Check soldered status of
C119,C120,L105
NO
Check or Resolder BTC400,C426
NO
Resolder or Change OSC100
NO
Resolder or Change U101
NO
GSM RX path component
resolder or change
3-25
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