LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 49 -
Check SW500.ANT, RF with RF
Cable connected.
Open
Yes
Changing SW500
Check SW500.ANT,RF
with RF Cable disconnected
Short
Yes
Changing SW500
No
No
Check R500,R503,R505
Check whether Ant SW
Set as TX mode
Refer to Graph 4.3.2
Refer to Table 4.3.2
Yes
Check ANT SW & Vdd
Check RF Level of
U500 Pin 17(for GSM) & Pin 19(for DCS)
Pin17 : ~29.5dBm
Pin19 : ~26.5dBm
No
Yes
No
Changing board
Go to 4.3.4 Checking PAM
control signal
END
For the test,
TX Stand alone Mode is needed. Refer to
chapter 10 (PL=7 for GSM, PL=2 for DCS)
Table 4.3.2
0
1
1
GSM Tx
BS
Tx_EN
1
1
1
DCS Tx
1
0
1
DCS Rx
0
0
1
GSM Rx
Input Control Bits
Vlogic
Mode
CHECKING FLOW