LG F3000 Service Manual page 55

4. TROUBLESHOOTING
Checking Flow
For these 2 test case,
No Call connection is needed
Check SW500 Pin ANT,RF
with RF Cable connected.
Check SW500 Pin ANT,RF
with No RF Cable Connected
Check C503,C504,C505
Check whether FEM
Set as RX mode
Refer to Table 4-2
Check RF Level of
FL610.6 (for GSM) & FL610.4
(for DCS) & FL610.2 (for PCS)
For this RF Level test case,
RX Stand alone Mode is needed
EGSM-Tx 0.0-0.1V
EGSM-Rx 0.0-0.1V
DCS/PCS-Tx 0.0-0.1V
DCS-Rx 0.0-0.1V
PCS-Rx 2.3-3.0V
Open
Yes
Short
Yes
VC1 :Low or HIGH
VC2 :Low VC3:LOW
Yes
Pin6 : ~ -62dBm
Pin 4,2 : ~ -63dBm
Yes
FEM & Mobile SW is OK
See next Page to check
Rx IQ Signal
Vc1 Vc2
0.0-0.1V
0.0-0.1V
2.3-3.0V
0.0-0.1V
0.0-0.1V
Table 4-2
No
Changing SW500
No
Changing SW500
No
Changing the Board.
No
Changing FL610
Vc3 Current
2.3-3.0V 10mA Max
0.0-0.1V ≈ 0mA
0.0-0.1V 10mA Max
0.0-0.1V ≈ 0mA
0.0-0.1V 10mA Max
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