LG B2050 Service Manual - Page 58

Table 4-2

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Checking Flow 4 . TROUBLE SHOOTING For the test, TX Stand alone Mode is needed. Refer to chapter 11 (PL=7 for GSM, PL=2 for DCS) Check R512, R515, R517 No Check whether FEM Check VC1, VC2, VC3 Set as TX mode Refer to Graph4-6(a), 4-6(b) Refer to Table 4-3 Yes Changing board Check RF Level of FL500 Pin 17 (for GSM) & Pin 15 (for DCS) Check SW500.ANT, RF with RF Cable connected. Check SW500.ANT, RF with RF Cable disconnected Pin17 : ~29.5dBm Pin15 : ~26.5dBm No Go to 4.3.5 Checking PAM control singnal Yes Open Yes Short Yes No Changing SW500 No Changing SW500 END ANT SW CONTROL TABLE VC1 EGSM_Tx L DCS PCS_Tx L EGSM DCS_ Rx L PCS_Rx H VC2 VC3 L H H L L L L L Table 4-2 - 57 -

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- 57 -
4 . TROUBLE SHOOTING
Table 4-2
EGSM_Tx
DCS PCS_Tx
EGSM DCS_ Rx
PCS_Rx
VC1
L
L
L
H
ANT SW CONTROL TABLE
VC2
L
H
L
L
VC3
H
L
L
L
For the test,
TX Stand alone Mode is needed. Refer to
chapter 11 (PL=7 for GSM, PL=2 for DCS)
Check VC1, VC2, VC3
Changing board
Go to 4.3.5 Checking PAM
control singnal
Changing SW500
Changing SW500
Pin17 : ~29.5dBm
Pin15 : ~26.5dBm
Open
No
No
No
No
Yes
Yes
Yes
Yes
Short
END
Check RF Level of
FL500 Pin 17 (for GSM) & Pin 15
(for DCS)
Check SW500.ANT, RF with RF
Cable connected.
Check SW500.ANT, RF
with RF Cable disconnected
Checking Flow
Check R512, R515, R517
Check whether FEM
Set as TX mode
Refer to
Graph4-6(a), 4-6(b)
Refer to
Table 4-3