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IC-4A
ICOM IC-4A Manuals
Manuals and User Guides for ICOM IC-4A. We have
4
ICOM IC-4A manuals available for free PDF download: Service Manual, Instruction Manual
Icom IC-4A Service Manual (64 pages)
430/440 MHz
Brand:
Icom
| Category:
Transceiver
| Size: 3 MB
Table of Contents
Assistance
2
Ordering Replacement Parts
2
Table of Contents
3
Specifications
4
Outside and Inside Views
5
Top View
5
Frequency Display
5
Front and Side Views
6
Rear and Bottom Views
6
Front Side Views
7
Bottom Inside Views
7
Front Inside View
8
Illustrated Appearance
8
Unit Location
9
Rear Inside Views
10
RF Unit
10
Block Diagram
12
Circuit Description
13
Receiver Circuits
13
Antenna Switching Circuit
13
RF Circuit
13
Transmitter Circuits
14
S-Meter Circuit
14
PLL Circuits
14
Buffer Amplifier Circuit
14
Dual Modulus Prescaler
15
Reference Oscillator Circuit
15
Loop Filter
15
VCO Circuit
15
Logic Circuits
16
CPU Port Allocations
16
Initial Matrix
16
Key Matrix
16
Meter Comparator
17
Power Saver Circuit
17
Hardware Configuration of Key Matrix
17
Lamp Circuit
18
Power Supply Circuits
18
Reduced Voltage Detecting Circuit
18
Other Circuits
18
Mechanical Parts and Disassembly
19
Front Panel Disassembly
19
Speaker Disassembly
20
Rear Case Disassembly
20
Top Panel Disassembly
21
Tone Unit/Tone Call Unit Disassembly
21
Maintenance and Adjustment
22
Preparation before Servicing
22
PLL Adjustment
23
Unit Locations
24
Receiver Adjustment
25
Transmitter Adjustment
27
Subaudible Tone, DTMF and Tone Call Adjustment
29
Board Layouts
31
Interconnections
31
Main Unit
33
RF Unit, RF Coil Unit, if Unit
37
VCO Unit
40
Tone and Tone Call Units
42
Voltage Diagrams
46
Parts List
53
Schematic Diagram
59
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Icom IC-4A Instruction Manual (41 pages)
440MHz FM TRANSCEIVER
Brand:
Icom
| Category:
Transceiver
| Size: 2 MB
Table of Contents
Inside Views
2
Section 11 Specifications
4
Section IV Pre-Operation
7
Battery Installation
7
How to Charge
7
When to Replace Batteries
9
For Outdoor Use
10
Top Panel
12
Squelch Control
12
Battery Charge Indicator
17
Section VI Operation
18
Section VII Inside View
20
Main Unit Side
20
Receiver Circuits
22
Power Amplifier Circuit
25
Vco Circuit
28
Power Supply Circuit
28
Volume Control
30
Section XI Block Diagram
37
ICOM IC-4A Instruction Manual (40 pages)
440 MHz FM Transceiver
Brand:
ICOM
| Category:
Transceiver
| Size: 1 MB
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Icom IC-4A Instruction Manual (40 pages)
440 MHz FM Transceiver
Brand:
Icom
| Category:
Transceiver
| Size: 1 MB
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