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5. TROUBLE SHOOTING
Check TP1 of SW400
with RF Cable and TP2 of C420
TP1 Signal same
as TP2?
Replace Mobile SW
(SW400)
Yes
No
Yes
Mobile SW & FEM is OK.
Check Antenna.
Replace BB CHIP (U101)
Control Signal is
OK
?
No
Yes
Check TP3, TP4 of FL400
?
Replace FEM (FL400)
TP5 Signal is
OK ?
No
Yes
Checking Flow
EGSM TX
Figure 30 Mobile SW
Figure 31 FEM Control Signals
TP1(ANT SW1)
TP2(ANT SW2)