LG VX5400 Service Manual page 3

CHAPTER 3. Circuit Description ...................................................................23
1. RF TRANSMIT/RECEIVE PART..................................................................................................... 23
1.1 Overview .................................................................................................................................................... 23
1.2 Description of Receive Part Circuit......................................................................................................... 24
1.3 Description of Transmit Part Circuit...................................................................................................... 27
1.4 Description of Frequency Synthesizer Circuit ....................................................................................... 28
2. DIGITAL/VOICE PROCESSING PART .......................................................................................... 28
2.1 Overview .................................................................................................................................................... 28
2.2 Configuration ............................................................................................................................................ 28
2.3 Circuit Description.................................................................................................................................... 29
CHAPTER 4. Trouble shooting... ...................................................................32
4.1 Rx part Trouble .......................................................................................................................................... 32
4.2 Tx part Trouble........................................................................................................................................... 62
4.3 Logic part Trouble...................................................................................................................................... 92
CHAPTER 5. Safety ...................................................................................116
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