Samsung SGH-S720i, Руководство по обслуживанию

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Flow Chart of Troubleshooting and Circuit Diagrams
3-24
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3-2.RF
3-2-1. EGSM Rx
Continuous RX ON
RF Input : 62CH
AMP : -50dBm
Check pin #12 of
PAM100
≥
-65dBm
Check pin #24,25 of
RFT100
≥
-65dBm
Check pin #16,17,33 of
RFT100
≥
2.9V
Check the pin #34,35 of RFT100
=26Mhz
Check the pin #4,5,6,7 of
RFT100 Vp-p=100mV
END
Resolder or Change
RFS100,L100,L101,C110
Resolder or Change PAM100
Check soldered status of
C115,C119,L106
Check or Resolder BTC601,C604
Resolder or Change OSC100
Resolder or Change RFT100
Normal Condition Catch the
channel
Check pin #16 of
PAM100
≥
-65dBm
GSM Receiver is O.K?
GSM RX path component
resolder or change
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
Check soldered status of
C101,L103,L100,L101,C110