LG L1150 Service Manual page 95

4. TROUBLE SHOOTING
2. Check Ant. SW(FL801) and RF SW connector(SW801)
ANT
1
1) Check RF frequency at each point(1,2,3,4,5).
Can you observe good RF signal at proper frequency?
– GSM850 190Ch. : 881.6MHz
– GSM1800 700Ch. : 1652.8MHz
– GSM1900 661Ch. : 1960MHz
2) Check RF Power at each point.
Can you observe good RF signal at proper frequency?
– At check point 1& 2
RF Power is almost same with input power set to equipment.
– At other check point
GSM850 Insertion loss ~ 3dB
GSM1800 Insertion loss ~ 3.8dB
GSM1900 Insertion loss ~ 3.8dB
3) If not, change FL801(Ant. SW)
2
ANT SW
3 4 5
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Check these circuit with High
Frequency Probe.
You can see RF signal at
Spectrum Analyzer !