LG M6100 Service Manual - Page 67

Egsm-tx, 0-0.1v, 3-3.0v, 10ma Max, Egsm-rx, ≈ 0ma, Dcs/pcs-tx, Dcs-rx, Pcs-rx

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Page 67 highlights

4. TROUBLE SHOOTING Checking Flow For the test, TX Stand alone Mode is needed. (PL=5 for GSM, PL=0 for DCS) Check C505,C506,C507 Check whether FEM Set as TX mode No Check VC1, VC2, VC3 Rrefer to Graph4-6(a), 4-6(b) Rrefer to Table 4-3 Yes Changing board Check RF Level of FL601.10 (for GSM) & Pin 8 (for DCS) Check SW501.ANT, RF with RF Cable connected. Check SW501.ANT,RF with RF Cable disconnected Pin10 : ~32.5dBm Pin 8 : ~29.5dBm Yes Open Yes Short Yes END No Go to 4.3.5 Checking PAM control signal No Changing SW501 No Changing SW501 EGSM-Tx EGSM-Rx DCS/PCS-Tx DCS-Rx PCS-Rx Vc1 0.0-0.1V 0.0-0.1V 0.0-0.1V 0.0-0.1V 2.3-3.0V Vc2 0.0-0.1V 0.0-0.1V 2.3-3.0V 0.0-0.1V 0.0-0.1V Table 4-2 Vc3 2.3-3.0V 0.0-0.1V 0.0-0.1V 0.0-0.1V 0.0-0.1V Current 10mA Max ≈ 0mA 10mA Max ≈ 0mA 10mA Max - 68 -

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4. TROUBLE SHOOTING
- 68 -
Check SW501.ANT, RF
with RF
Cable connected.
Open
Yes
Changing SW501
Check SW501.ANT,RF
with
RF Cable disconnected
Short
Yes
Changing SW501
No
No
Check C505,C506,C507
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 : ~32.5dBm
Pin 8 : ~29.5dBm
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=5 for
GSM, PL=0 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