LG -600 Series Repair Manual page 73

Appendix.
Tx Flow Chart & Solution
9-A) Check Placement of U100
GSM TX BAND DCS TX BAND
9-B) Check Pin 4,5, Using Oscilloscope 9-B) Check Pin 4,5, Using Oscilloscope
Yes No No Yes
4.2V ? Check Main Battery 4.2V ?
9-C) Check Pin 6, Using Spectrum Analyzer
9-C) Check Pin 6, Using Spectrum Analyzer.
Attenuator Check!!
Yes No No Yes
TX Output ~20dbm? TX Output ~18dbm?
Check Short & Resistor Value
9-B) Test!!
Yes Yes
Each Power
Each Power
Block 10 !!
Level OK. ?
Level OK. ?
No No
Block 9!!
GSM Handsets Lab.
73