LG KG280 Service Manual - Page 49

Checking Flow

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4. TROUBLE SHOOTING Checking Flow For the test, TX Stand alone Mode is needed. Refer to chapter 11 (PL=7 for GSM850/EGSM, PL=2 for DCS/PCS) Check C630,C631 Check whether Ant SW Check VC1_GSM850/EGSM No Set as TX mode VC2_DCS/PCS Refer to Graph 5 Refer to Table 4-2 Yes Changing board Check RF Level of FL600 Pin 12(for GSM850/EGSM) & Pin 10(for DCS/PCS) Check SW600.ANT, RF with RF Cable connected. Check SW600.ANT,RF with RF Cable disconnected Yes Open Yes Short Yes END No Go to nest page checking PAM control signal No Changing SW600 No Changing SW600 VC1_GSM850/EGSM GSM850/EGSM_TX HIGH DCS/PCS_TX LOW GSM/DCS/PCS RX LOW VC2_DCS/PCS LOW HIGH LOW Table 4-2 LGE Internal Use Only - 50 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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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
- 50 -
Check SW600.ANT, RF
with RF
Cable connected.
Open
Yes
Changing SW600
Check SW600.ANT,RF
with
RF Cable disconnected
Short
Yes
Changing SW600
No
No
Check C630,C631
Check whether Ant SW
Set as TX mode
Refer to Graph 5
Refer to Table 4-2
Yes
Check
VC1_GSM850/EGSM
VC2_DCS/PCS
Check RF Level of FL600
Pin 12(for GSM850/EGSM)
& Pin 10(for DCS/PCS)
No
Yes
No
Changing board
Go to nest page checking
PAM control signal
END
For the test,
TX Stand alone Mode is needed.
Refer to
chapter 11 (PL=7 for GSM850/EGSM,
PL=2 for DCS/PCS)
Checking Flow
Table 4-2
VC1_GSM850/EGSM
VC2_DCS/PCS
GSM850/EGSM_TX
HIGH
LOW
DCS/PCS_TX
LOW
HIGH
GSM/DCS/PCS RX
LOW
LOW