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Flow Chart of Troubleshooting
3-16
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3-2-2. DCS Rx
Continuous RX ON
RF Input : 660CH
AMP : -50dBm
Check pin #12 of
PAM400
≥
-65dBm
Check pin #27,28 of
U300
≥
-65dBm
Check pin #17 of
U300
≥
2.8V
Check the pin #19,20 of U300=26M
hz
Check the pin #2,3,22,23 of
U40
0 Vp-p=120mV
END
Resolder or Change
RFS400,L301,L302,L304,C302,C305
Resolder or Change PAM400
Check soldered status of
C308,C312,L306
Resolder or change UCP pinA13
C116
Resolder or Change OSC400
Resolder or Change U300
Normal Condition Catch the
channel
Check pin #20 of
PAM400
≥
-65dBm
GSM Receiver is O.K?
GSM RX path component
resolder or change
Check soldered status of
ANT,R300,C300,C304,L303
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
①
②
③
④
⑤
⑥
⑦
CONTINOUS TX ON CONDITION
TX POWER DAC: 500 CODE
APPLIED
CH : 30
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB