LG F3000 - Page 61

4. TROUBLESHOOTING
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Check SW500.ANT, RF with RF
Cable connected.
Open
Yes
Changing SW500
Check SW500.ANT,RF
with RF Cable disconnected
Short
Yes
Changing SW500
No
No
Check C503,C504,C505
Check whether FEM
Set as TX mode
RRefer to Graph4-6(a), 4-6(b)
RRefer to Table 4-3
Yes
Check VC1, VC2, VC3
Check RF Level of
FL610.10 (for GSM) & Pin 8 (for
DCS)
Pin10 : ~32.5dBm
Pin 8 : ~29.5dBm
No
Yes
No
Changing board
Go to 4.3.5 Checking PAM
control signal
END
For the test,
TX Stand alone Mode is needed.
(PL=5 for GSM, PL=0 for DCS)
Checking Flow
Table 4-3
Vc1 Vc2 Vc3 Current
EGSM-Tx 0.0-0.1V 0.0-0.1V 2.3-3.0V 10mA Max
EGSM-Rx 0.0-0.1V 0.0-0.1V 0.0-0.1V ≈ 0mA
DCS/PCS-Tx 0.0-0.1V 2.3-3.0V 0.0-0.1V 10mA Max
DCS-Rx 0.0-0.1V 0.0-0.1V 0.0-0.1V ≈ 0mA
PCS-Rx 2.3-3.0V 0.0-0.1V 0.0-0.1V 10mA Max