LG KF600w Service Manual page 83

4.2.2.4 Check PCS RF Tx SAW
Test Point
Test Point
F105
RF_OUT
Checking Flow
Checking Flow
Start
Check pin1(TP1)
at F 105 . Referring to
Figure 4.2.2(g)
Is it similar?
Check pin 4(TP2)
at F 105 . Referring to
Figure 4.2.2(h)
Is it similar?
NO
Replace F 105
RF_IN
Check
U113(RFT6150)
YES
RF Tx SAW is
OK
YES
Circuit Diagram
Circuit Diagram
TP2 TP1
Waveform
Waveform
RF_IN fed up with CW signal
Figure 4.2.2(g)
RF_IN
RF_OUT