Only For Training And Service Purposes - LG GM200 Service Manual

4. TROUBLE SHOOTING
CHECKING FLOW
Check SW501 Pin ANT, RF
with RF Cable connected.
Check SW501 Pin ANT, RF
with No RF Cable Connected
Check R514, R515, C512
Check whether Ant SW
Set as RX mode
Refer to Table 4.2.1
Check RF Level of
U502.14(for GSM850) ,
U502.13(for EGSM),
U502.12(for DCS1800) &
U502.11(for PCS1900)
For this RF Level test case,
RX Stand alone Mode is needed refer to
LGE Internal Use Only
LGE Internal Use Only
For these 2 test case,
No Call connection is needed
Open
Short
Yes
Check ANT_SW1, 2 & VBAT
Pin 14, 15 : ~ -62dBm
Pin 13, 12 : ~ -63dBm
Ant SW & Mobile SW is OK
See next Page to check
Rx I/Q Signal
chapter 10
No
Yes
No
No
Yes
No
Yes
Table 4.2.1
- 74 - Copyright © 2009 LG Electronics. Inc. All right reserved.
Changing SW501
Changing SW501
Changing the Board.
Changing U502.

Only for training and service purposes