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IC-A22
Icom IC-A22 Service Manual
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SECTION 9
BO
ARD LA
Y
OUTS
9 - 1
ANL
PTT
LIGHT
R30
J9001
R10K
TO LOGIC UNIT J6003
Add "9000" to each indicated par
t number on the unit
for the actual part number
.
NO
TE:
PTTSW
GND
R12K
GND
LV
5V
OUT
SHIFT
Add "7000" to each indicated par
t number on the board
for the actual part number
.
NO
TE:
T
O MAIN UNIT
+
c
-
9-1 PTT UNIT
9-2 PR
T UNIT
9-3 VCO
BO
ARD
27
29
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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