Table Of Contents - Icom IC-?4AT Service Manual

Table of Contents

Assistance2
Ordering Replacement Parts2
Table Of Contents3
Specifications4
Outside And Inside Views5
Top View5
Frequency Display5
Front And Side Views6
Rear And Bottom Views6
Front Side Views7
Bottom Inside Views7
Front Inside View8
Illustrated Appearance8
Unit Location9
Rear Inside Views10
Rf Unit10
Block Diagram12
Circuit Description13
Receiver Circuits13
Antenna Switching Circuit13
Rf Circuit13
Transmitter Circuits14
S-Meter Circuit14
Pll Circuits14
Buffer Amplifier Circuit14
Dual Modulus Prescaler15
Reference Oscillator Circuit15
Loop Filter15
Vco Circuit15
Logic Circuits16
Cpu Port Allocations16
Initial Matrix16
Key Matrix16
Meter Comparator17
Power Saver Circuit17
Hardware Configuration Of Key Matrix17
Lamp Circuit18
Power Supply Circuits18
Reduced Voltage Detecting Circuit18
Other Circuits18
Mechanical Parts And Disassembly19
Front Panel Disassembly19
Speaker Disassembly20
Rear Case Disassembly20
Top Panel Disassembly21
Tone Unit/Tone Call Unit Disassembly21
Maintenance And Adjustment22
Preparation Before Servicing22
Pll Adjustment23
Unit Locations24
Receiver Adjustment25
Transmitter Adjustment27
Subaudible Tone, Dtmf And Tone Call Adjustment29
Board Layouts31
Interconnections31
Main Unit33
Rf Unit, Rf Coil Unit, If Unit37
Vco Unit40
Tone And Tone Call Units42
Voltage Diagrams46
Parts List53
Schematic Diagram59