FM540 Service Manual
Contents
1.
Overview ...................................................................................................................................................... 1
1.1.
Scope
....................................................................................................................................................................... 1
1.2.
Safety Precaution
................................................................................................................................................... 1
2.
External Views and Key Features ............................................................................................................. 2
2.1
Front Panel
.............................................................................................................................................................. 2
2.2
LCD Display
............................................................................................................................................................ 3
2.3
Rear Panel
............................................................................................................................................................... 4
2.4
Microphone (Handheld)
......................................................................................................................................... 4
3.
Circuit Description ...................................................................................................................................... 6
3.1
Overview
.................................................................................................................................................................. 6
3.2
Frequency Composition of Circuit
........................................................................................................................ 6
3.3
RX Principle
............................................................................................................................................................. 7
3.4
TX Principle
............................................................................................................................................................. 8
3.5
Principle of Frequency Synthesizer
..................................................................................................................... 9
3.6
Audio Processing Circuit
..................................................................................................................................... 10
3.7
Power Supply
........................................................................................................................................................ 10
3.8
MCU Unit
............................................................................................................................................................... 11
3.9
Semiconductor Description
................................................................................................................................. 13
4.
Feature Description and Parameter Settings ........................................................................................ 19
4.1
TOT(time-out-timer)
............................................................................................................................................. 19
4.2
Channel Scan
....................................................................................................................................................... 19
4.2.1.
Carrier Control Scan ............................................................................................................................ 19
4.2.2.
Scan Revert Channel .......................................................................................................................... 20
4.3
Kill and Unkill
......................................................................................................................................................... 20
4.4
Emergency
............................................................................................................................................................ 20
4.5
Feature and Parameter Settings
........................................................................................................................ 21
5.
Assembling and Disassembling .............................................................................................................. 22
5.1
Exploded View
...................................................................................................................................................... 22
I
Summary of Contents for FM540
Page 1: ...FM540 Service Manual FM540 㔤 ሱ䶒 I ...
Page 89: ...FM540Service Manul Figure 2 FM540 01 Top Layer Position Diagram 136 174MHz Page 86 of 99 ...
Page 90: ...FM540Service Manul Figure 3 FM540 01Bottom Layer Position Diagram 136 174MHz Page 87 of 99 ...
Page 101: ...FM540Service Manul Figure 8 FM540KEYTop Layer Position Diagram Page 98 of 99 ...
Page 102: ...FM540Service Manul Figure 9 FM540KEY Bottom Layer Position Diagram Page 99 of 99 ...
