LG LG9200 Service Manual page 79

4. TROUBLE SHOOTING
RX Part Trouble Shooting(3)
1. Check Ant. SW and Mobile SW
GSM/PCS Rx Path
GSM Rx Path
➀ Check RF Power at each point(➀, ➁, ➂-1, ➂-2).
➁ Can you observe good RF signal at proper frequency?
• GSM 190Ch. : 881.6MHz
• PCS 661Ch. : 1960MHz
• RF Power is almost same with input power set to equipment.
➂ If not, change FL503(Ant. SW)
FL503
-2
-1
PCS Rx Path
Check these circuit with High Frequency Probe.
You can see RF signal at Spectrum Analyzer !
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