LG C1100 Service Manual page 57

4. Trouble Shooting
(5) Checking Ant SW & Mobile SW
Checking Flow
Check L305, L306
Check whether Ant SW
Set as TX mode
• Refer to Graph 4-7(a),4-7(b)
• Refer to Table 4-2
Check RF Level of
FL301 Pin 5 (for GSM) & Pin 3
(for DCS)
Check SW301.ANT, RF with
RF Cable connected.
Check SW301.ANT,RF
with RF Cable disconnected
ANT SW
DCS TX
EGSM TX
EGSM,DCS RX
For the test,
TX Stand alone Mode is needed. Refer to
chapter 11 (PL=7 for GSM, PL=2 for DCS)
Check VC1, VC2
Pin5 : ~29.5dBm
Pin 3 : ~26.5dBm
Table 4-2.
VC1 VC2
0 1
1 0
0 0
No
Yes
No
Yes
No
Open
Yes
No
Short
Yes
END
- 56 -
Changing board
Go to 4.3.5 Checking PAM
control signal
Changing SW301
Changing SW301