LG AT&T GR500 Service Manual page 154

4.22.6 Checking RF Rx Path
A. GSM Rx path Level
RF Input
①
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
GSM Transceiver
GSM
Rx
GSM/EDGE PA
(+Ant. SW)
Figure 4-27. GSM900/DCS/PCS Rx path
Test Program Script
2. DCS/PCS Rx
1. GSM900 Rx
MODE=2(DCS),1(PCS)
MODE=0
SWRX=699,2
SWRX=64,2
v Agilent 8960 Setting
CW Mode
GSM900 : -50dBm@Ch65(948MHz)
DCS : -50dBm@Ch700(1842.8MHz)
PCS : -50dBm@Ch700(1967.8MHz)
v Oscilloscope Setting
- 155 -
4. TROUBLE SHOOTING
U103
DCS/PCS
Rx
U200
②
TP26_RF
LGE Internal Use Only