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IC-A22
Icom IC-A22 Service Manual
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TO PTT UNIT
R30
8
8
5
5
1
1
4
4
8
14
8
7
1
12
5
X1
26
50
51
75
76
100
UP
DE
DOWN
LOK
TRC
SHIFT
PTT
LOW
TMUT
GND
GND
NA
V
SQL
BEEP
DETO
AFON
WX
ANL
GND
GND
GND
GND
+5
GND
GND
GND
INTMIC
GND
CLONE
GND
VCC
GND
GND
CLK
D
ATA
ENB
8
5
5
1
1
4
4
R10K
PTTSW
GND
R12K
GND
Add "6000" to each indicated par
t number on the unit f
or the actual par
t number
.
NO
TE:
TO MAIN UNIT
9 - 7
•
BOTT
OM
VIEW (LOGIC UNIT [IC-A22/E])
33
35
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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