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IC-281H
Icom IC-281H Service Manual
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2
Table of Contents
Repair Notes
2
Table of Contents
3
Specifications
4
Main Unit View
5
Circuit Description
6
Receiver Circuits
6
Antenna Switching Circuit (Main Unit)
6
RF and 1St Mixer Circuits/Af Circuit (Main Unit)
6
Transmitter Circuits
7
Squelch Circuit (Main and Logic Units)
7
Microphone Amplifier (Logic Unit)
7
Modulation Circuit - VCO-A Board
7
PLL Circuits
8
Power Supply Circuits
8
Voltage Lines
8
Port Allocation
9
CPU - Logic Unit IC6
9
Adjustment Procedures
10
PLL Adjustment
10
Receiver Adjustment
10
Transmitter Adjustment
10
Parts List
12
Mechanical Parts and Disassembly
20
Chassis Parts
20
Accessories
20
Exploded View
21
Board Layouts
23
Logic Unit PC Boards
23
Main Unit PC Boards
25
Optional Units
29
UT-66 Voice Synthesizer Unit Diagram and PC Board
29
UT-85 Tone Squelch Unit Diagram and PC Boards
30
Block Diagram
31
Voltage Diagrams
33
Logic Unit Voltage Diagram
33
Main Unit Voltage Diagram
37
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Instruction Manual
61 pages
4
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Icom IC-281H Specifications
General
Frequency Range
144-148 MHz
Modes
FM
Dimensions
6.1 x 7.5 x 2.5 inches
Weight
2.9 lbs
Supply voltage
13.8 VDC
Type
Mobile
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