LG P7200 - Page 67

4. TROUBLE SHOOTING
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Check SW601.ANT, RF with RF
Cable connected.
Open
Yes
Changing SW601
Check SW601.ANT,RF
with RF Cable disconnected
Short
Yes
Changing SW601
No
No
Check C616,C617,C618
Check whether FEM
Set as TX mode
Rrefer to Graph4-6(a), 4-6(b)
Rrefer to Table 4-3
Yes
Check VC1, VC2, VC3
Check RF Level of
FL601.10 (for GSM) & Pin 8 (for
DCS)
Pin10 : ~29.5dBm
Pin 8 : ~26.5dBm
No
Yes
No
Changing board
Go to 4.3.5 Checking PAM
control signal
END
For the test,
TX Stand alone Mode is needed. (PL=7 for
GSM, PL=2 for DCS)
Checking Flow
Table 4-2
Vc1 Vc2 Vc3 Current
EGSM-Tx 0.0-0.1V 0.0-0.1V 2.3-3.0V 10mA Max
EGSM-Rx 0.0-0.1V 0.0-0.1V 0.0-0.1V ≈ 0mA
DCS/PCS-Tx 0.0-0.1V 2.3-3.0V 0.0-0.1V 10mA Max
DCS-Rx 0.0-0.1V 0.0-0.1V 0.0-0.1V ≈ 0mA
PCS-Rx 2.3-3.0V 0.0-0.1V 0.0-0.1V 10mA Max