LG C3400 Service Manual page 61

4. Troubleshooting
Checking Flow
Check C531,C537
Check whether Ant SW
Set as TX mode
efer to Graph 4-6
efer to Table 6-11
Check RF Level of
FL500 Pin 5 (for GSM) & Pin 3 (for
Check SW500.ANT, RF with RF
Cable connected.
Check SW500.ANT,RF
with RF Cable disconnected
TX Stand alone Mode is needed. Refer to
chapter 11 (PL=7 for GSM, PL=2 for DCS)
DCS)
For the test,
Check VC1, VC2
Yes
Pin5 : ~29.5dBm
Pin 3 : ~26.5dBm
Yes
Open
Yes
Short
Yes
END
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No
Changing board
No
Go to 4.3.5 Checking PAM
control signal
No
Changing SW501
No
Changing SW501
ANT SW VC1
DCS TX
0
EGSM TX
1
EGSM, DCS RX
0
Table 4-3
VC2
1
0
0