Table Of Contents - Icom IC-2720H Service Manual

Table of Contents

Introduction2
Danger2
Ordering Parts2
Repair Notes2
Table Of Contents3
Specifications4
Inside Views5
Control Unit (Top View)5
Main Unit (Top View)5
Control Unit (Bottom View)6
Main Unit (Bottom View)6
Disassembly Instructions7
Removing The Main Unit7
Removing The Control Unit8
Circuit Description9
Receiver Circuits9
Triplexer And Rx Band Switching Circuits (Main Unit)9
Rf Circuit For Left Side Display9
1St Mixer And 1St If Circuit For Left Side Display (Main Unit)10
2Nd If And Demodulator Circuits For Left Side Display (Main Unit)10
Af Amplifier Circuit For Left Side Display (Main Unit)10
Noise Squelch Circuit For Left Side10
Vco Unit10
Rf Circuit For Right Side Display11
1St Mixer And 1St If Circuit For Right Side Display (Main Unit)11
Af Amplifier Circuit For Right Side12
Noise Squelch Circuit For Right Side12
Tone Squelch12
Transmitter Circuits13
Microphone Amplifier Circuit13
Vhf Modulation Circuit13
Uhf Modulation Circuit (Main Unit)13
Apc Circuit (Main Unit)14
Pll Circuits14
Pll Circuit For Right Side Display14
R-Vco Circuit For Right Side Display14
Pll Circuit For Left Side Display15
L-Vco Circuit For Left Side Display15
Power Supply Circuits16
Control Unit Voltage Line16
Main Unit Voltage Line17
Vco Unit Voltage Line17
Port Allocations18
Cpu18
D/A Converter Ic19
Parts List20
Control Unit20
Main Unit21
Mechanical Parts And Disassembly33
Semi-Conductor Information35
Transsistors and Fet's35
Diodes35
Board Layouts36
Bottom View (Control Unit)37
Block Diagram42
Voltage Diagrams44
Main And Vco Units45