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IC-F420S
Icom IC-F420S Service Manual
41 pages
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SER
VICE
MANUAL
UHF FM TRANSCEIVER
iF410
iF410S
iF420
iF420S
6-9-16, Kamihigashi, Hirano-ku Osaka 547-0002, Japan
A-5560SI-SU
©
1999 by Icom Inc.
iF410
iF410S
iF420
iF420S
Cover420s 99.2.17 10:40 AM Page 1
2
Table of Contents
Default Chapter
2
Introduction
2
Ordering Parts
2
Repair Notes
2
Explicit Definitions
3
Table of Contents
3
Specifications
4
Inside View
5
Section 2 Inside View
6
Disassembly Instructions
6
Opening Case
6
Instllation Location
6
Circuit Description
7
Receiver Circuits
7
Antenna Switching Circuit
7
Rf Circuit
7
Af Amplifier Circuit
8
Transmitter Circuit
8
Microphone Amplifier Circuit
8
Receiver Mute Circuits
8
Drive Amplifier Circuit
9
Pll Circuits
9
Power Amplifier Circuit
9
Apc Circuit
9
Power Supply Circuits
10
Voltage Lines
10
Port Allocations
10
Cpu
10
I/O Expander IC
11
Adjustment Procedures
12
Preparation
12
Required Test Equipment
12
Adjustment Frequency
12
Program Screen Example
13
Connections
13
Pll Adjustment
14
Trimmer Adjustment
15
Section 9 Board Layouts
17
Section 8 Semi-Conductor Information
17
Beep Adjustment
17
Front Unit (IC-F410/F420)
17
Parts List
18
Mechanical Parts
26
Semi-Conductor Information
28
Transistors and Fet's
28
Diodes
28
Board Layouts
29
Front Unit
29
Bottom View
30
Front Unit (IC-F410S/F420S)
31
Main Unit
33
Section 11 Voltage Diagram
35
Block Diagram
35
Front Unit
35
Main Unit
35
Voltage Diagram
36
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Icom IC-F420S Specifications
General
Frequency Range
400-470 MHz
Power Output
5W
Channel Capacity
16 channels
Modulation Type
16K0F3E
Battery Life
10 hours
Channel Spacing
25 kHz
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