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IC-A22
Icom IC-A22 Service Manual
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4 - 2
A
TTENU
A
T
OR
40 or 50 dB
MODULA
TION
ANAL
YZER
DUMMY LOAD
8
Ω
AC
MILLIV
OL
TMETER
A
UDIO GENERA
TOR
300–3000 Hz
DC POWER SUPPL
Y
12 V/2 A or more
Reference frequency
adjustment
Modulation
adjustment
to [DC 12V]
to [SP]
to [ANT]
to [MIC]
C4101
R5087
R5047
R5098
R4057
RF POWER METER
50
Ω
/1–10 W
FREQUENCY
COUNTER
P
ow
er adjustment
CP2
T
une voltage
check point
R4068
T
une voltage
adjustment
RF UNIT
MAIN UNIT
10
12
Table of Contents
Default Chapter
3
Table of Contents
3
Specifications
4
Inside Views
5
Circuit Description
6
Receiver Circuits
6
Transmitter Circuits
8
Pll Circuits
8
Power Supply Circuits
9
Cpu Port Allocations
9
Adjustment Procedures
10
Pll and Transmitter Adjustments
10
Receiver Adjustment
12
Parts List
14
Vco Unit
18
Mechanical Parts and Disassembly
24
Block Diagram
26
Semiconductor Information
27
Board Layouts
28
Prt Unit
28
Vco Board
28
Rf Unit
29
Main Unit
31
Logic Unit [IC-A22/E]
33
Logic Unit [IC-A3/E]
35
Voltage Diagrams
37
Main Unit
37
RF UNIT (Inc. PRT UNIT and VCO BOARD)
38
LOGIC UNIT (Inc. PTT UNIT)
39
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Icom IC-A22 Specifications
General
Brand
Icom
Model
IC-A22
Category
Transceiver
Language
English
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