LG F3000 - Page 55

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