LG KG800 Service Manual page 59

4. TROUBLESHOOTING
Checking Flow
For these 2 test case,
No Call connection is needed
Check SW500 Pin ANT,RF
with RF Cable connected.
Check SW601 Pin ANT,RF
with No RF Cable Connected
Check C616,C617,C618
Check whether FEM
Set as RX mode
Refer to Table 4-2
Check RF Level of
FL601.6 (for GSM) & FL601.4
(for DCS) & FL601.2 (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 SW601
No
Changing SW601
No
Changing the Board.
No
Changing FL601
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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