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IC-A20MKII
Icom IC-A20MKII Manuals
Manuals and User Guides for Icom IC-A20MKII. We have
1
Icom IC-A20MKII manual available for free PDF download: Service Manual
Icom IC-A20MKII Service Manual (43 pages)
VHF Air Band
Brand:
Icom
| Category:
Transceiver
| Size: 14 MB
Table of Contents
Introduction
2
Danger
2
Repair Note
2
Table of Contents
3
Specifications
4
Inside Views
5
VOR Unit
5
Main Unit
5
RF Unit
5
Circuit Description
6
Receiver Circuits
6
Antenna Switching Circuit
6
RF Circuit
6
Squelch Circuit
7
AGC Circuit
7
AF Circuit
7
ANL Circuit
7
VOR Circuit
8
VOR Circuit Block Diagram
8
Transmitter Circuits
9
Microphone Amplifier and ALC Circuits
9
Modulator Circuit
9
Pre-Drive and Drive Amplifiers
9
PLL Circuits
10
General
10
Reference Oscillator
10
VCO Circuit
10
Power Supply Circuit
11
CPU Port Allocations
11
Internal/External Power Switching Circuit
11
Voltage Lines
11
Mechanical Parts and Disassembly
12
Chassis Parts
12
Accessories
12
Parts List
15
Adjustment Procedures
21
Preparation before Servicing
21
Required Test Equipment
21
Connection
21
PLL Adjustment
22
Receiver Adjustment
22
Transmitter Adjustment
24
Board Layouts
26
Logic Unit
26
RF and VCO Units
32
Block Diagram
34
Voltage Diagram
36
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