Only For Training And Service Purposes - LG KP175 Service Manual

4. TROUBLE SHOOTING
CHECKING FLOW
For these 2 test case,
No Call connection is needed
Check SW500 Pin ANT,RF
with RF Cable connected.
Check SW500 Pin ANT,RF
with No RF Cable Connected
CheckC500,C502,C503
Check whether Ant SW
Set as RX mode
Refer to Table 4.2.2
Check RF Level of
U501.7(for GSM)
& U501.6 (for DCS)
For this RF Level test case,
RX Stand alone Mode is needed
refer to chapter 10
LGE Internal Use Only
Open
Yes
Short
Yes
Check ANT SW & Vdd
Yes
Pin 7 : ~ -62dBm
Pin 6 : ~ -63dBm
Yes
Ant SW & Mobile SW is OK
See next Page to check
Rx I/Q Signal
- 44 -
No
Changing SW500
No
Changing SW500
No Changing the Board.
No
Changing U501
Mode Vlogic
GSM Rx 1
DCS Rx 1
GSM Tx 1
DCS Tx 1
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Input Control Bits
Tx_EN BS
0 0
0 1
1 0
1 1