Equipment information

Icom IC-449A Transceiver
Manufacturer
Icom
Model IC-449A
Date 1991
Category: Radio, Communication
Group Transceiver
Description 430 MHz FM TRANSCEIVER
Information
                                    

These manuals are available for the above equipment:

Icom -- IC-449A -- Service Manual
File name Icom-7452-Manual-Page-1-Picture
Manual Type Service Manual
Pages 47
Size 16.44 Mbytes (17233643 Bytes)
Language english
Revision
Manual-ID/Number
Date 1991
Quality Scanned document, all readable.
Upload date
MD5 8ab7cc17f37476e6b49a4a9689a75a08
Downloads 106 since 06 January 2016
Information
This service manual describes the latest information for the
following transceivers at the time of publication.

SECTION 1 SPECIFICATIONS
..........................................................................................................
1—1
SECTION 2 INSIDE
VIEWS.................................................................................................................
2—1
SECTION 3 CIRCUIT DESCRIPTION
............................................................................................3-1-5
3-1 RECEIVER CIRCUITS
...............................................................................................
3—1
3-2 TRANSMITTER CIRCUITS
........................................................................................
3—2
3-3 PLL
CIRCUITS.............................................................................................................
3—3
3-4 LOGIC CIRCUITS
......................................................................................................
3—3
3-5 OTHER CIRCUITS
......................................................................................................
3—5
SECTION 4 ADJUSTMENT PROCEDURES
.................................................................................4-1-4
4-1 PREPARATION BEFORE SERVICING
......................................................................
4—1
4-2 PLL
ADJUSTMENT......................................................................................................
4—2
4-3 RECEIVER ADJUSTMENT
........................................................................................
4—3
4-4 TRANSMITTER ADJUSTMENT
.................................................................................
4—3
SECTION 5 MECHANICAL PARTS AND DISASSEMBLY
...........................................................5-1-2
5-1 TRANSCEIVER
..........................................................................................................
5—1
5-2 ACCESSORIES
..........................................................................................................
5—1
SECTION 6 CONNECTOR ASSEMBLY
............................................................................................
6—1
SECTION 7 PARTS
LIST.................................................................................................................7-1-7
SECTION 8 BOARD
LAYOUTS.......................................................................................................8-1-7
8-1 LOGIC
UNIT.................................................................................................................
8—1
8-2 MAIN UNIT
.................................................................................................................
8—2
8-3 PLL-A UNIT
.................................................................................................................
8—4
8-4 IF UNIT
.........................................................................................................................
8—4
8-5 APC
UNIT.....................................................................................................................
8—4
8-6 VCO
UNIT.....................................................................................................................
8—5
8-7 MIC-AMP
UNIT..............................................................................................................
8—5
8-8 YGR
UNIT.....................................................................................................................
8—6
8-9 A-BANDUNIT
..............................................................................................................
8—6
8-10 UT-51 TONE ENCODER UNIT
.....................................................................................
8—7
SECTION 9 OPTION UNITS
..........................................................................................................9-1-2
9-1 UT-50 TONE SQUELCH UNIT
.....................................................................................
9—1
9-2 UT-55 DTMF ENCODER/DECODER
UNIT...................................................................
9—2
SECTION 10 VOLTAGE
DIAGRAM.......................................................................................................10—1
SECTION 11 BLOCK DIAGRAM
..........................................................................................................11—1
Icom-7452-Manual-Page-1-Picture
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