LG KG280 Service Manual - Page 44

Checking Flow

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4. TROUBLE SHOOTING CHECKING FLOW For these 2 test case, No Call connection is needed Check SW600 Pin ANT,RF with RF Cable connected. Check SW600 Pin ANT,RF with No RF Cable Connected Check C630,C631 Check whether Ant SW Set as RX mode Refer to Table 4-1 Open Yes Short Yes VC1 :Low VC2 :Low Yes No Changing SW600 No Changing SW600 No Changing the Board. Check RF Level of FL600.1(for GSM850) FL600.3(for EGSM) Pin 1,3: ~-62dBm No FL600.5(for DCS) Pin 5,7: ~-63dBm FL600.7(for PCS) Yes Ant SW & Mobile SW is OK See next Page to check Rx IQ Signal Changing FL600 For this RF Level test case, RX Stand alone Mode is needed refer to Chapter 10 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 45 - LGE Internal Use Only

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LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 45 -
Check C630,C631
Check whether Ant SW
Set as RX mode
Refer to Table 4-1
Yes
VC1 :Low
VC2 :Low
Check SW600
Pin ANT,RF
with RF Cable connected.
Open
Yes
Changing SW600
Check SW600
Pin ANT,RF
with No RF Cable Connected
Short
Yes
Changing SW600
For these 2 test case,
No Call connection is needed
No
No
Changing the Board.
Check RF Level of
FL600.1(for GSM850)
FL600.3(for EGSM)
FL600.5(for DCS)
FL600.7(for PCS)
Ant SW & Mobile SW is OK
See next Page to check
Rx IQ Signal
Pin 1,3: ~-62dBm
Pin 5,7: ~-63dBm
No
Changing FL600
Yes
No
For this RF Level test case,
RX Stand alone Mode is needed
refer to Chapter 10
CHECKING FLOW