Only For Training And Service Purposes - LG KP175 Service Manual

CHECKING FLOW
Check C500,C502,C503
Check whether Ant SW
Set as TX mode
Refer to Graph 4.3.2
Refer to Table 4.3.2
Check RF Level of
U501 Pin 17(for GSM) & Pin 19(for DCS)
Check SW500.ANT, RF with RF
Cable connected.
Check SW500.ANT,RF
with RF Cable disconnected
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

For the test,
TX Stand alone Mode is needed. Refer to
chapter 10 (PL=7 for GSM, PL=2 for DCS)
Check ANT SW & Vdd
Yes
Pin17 : ~29.5dBm
Pin19 : ~26.5dBm
Yes
Open
Yes
Short
Yes
END
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4. TROUBLE SHOOTING
No
Changing board
No
Go to 4.3.4 Checking PAM
control signal
No
Changing SW500
No
Changing SW500
Mode Vlogic
GSM Rx 1
DCS Rx 1
GSM Tx 1
DCS Tx 1
Input Control Bits
Tx_EN BS
0 0
0 1
1 0
1 1
LGE Internal Use Only