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INTRODUCTION
REPAIR NOTES
This service manual describes the latest service information
for the
IC-M422
VHF MARINE TRANSCEIVER
at the time
of publication.
DANGER
NEVER
connect the transceiver to an AC outlet or to a DC
power supply that uses more than 16 V. Such a connection
could cause a fire or electric hazard.
DO NOT
reverse the polarities of the power supply when
connecting the transceiver.
DO NOT
apply an RF signal of more than 20 dBm (100 mW)
to the antenna connector. This could damage the trans-
ceiver's front end.
ORDERING PARTS
Be sure to include the following four points when ordering
replacement parts:
1. 10-digit order numbers
2. Component part number and name
3. Equipment model name and unit name
4. Quantity required
<
SAMPLE ORDER
>
5030002790 LCD
A0286
IC-M422
Main unit 5 pieces
8810009510 Screw BO 2x4 NIxZU (BT) IC-M422
Chassis 10 pieces
Addresses are provided on the inside back cover for your
convenience.
1. Make sure the problem is internal before dis-assembling
the transceiver.
2.
DO NOT
open the transceiver until the transceiver is
disconnected from its power source.
3.
DO NOT
force any of the variable components. Turn
them slowly and smoothly.
4.
DO NOT
short any circuits or electronic parts. An
insulated turning tool
MUST
be used for all adjustments.
5.
DO NOT
keep power ON for a long time when the
transceiver is defective.
6.
DO NOT
transmit power into a signal generator or a
sweep generator.
7.
ALWAYS
connect a 30 dB to 40 dB attenuator between
the transceiver and a deviation meter or spectrum
analyzer when using such test equipment.
8.
READ
the instructions of test equipment thoroughly
before connecting equipment to the transceiver.
To upgrade quality, all electrical or mechanical parts and internal
circuits are subject to change without notice or obligation.
MODEL
COLORS
SYMBOL
IC-M422
BLACK
[BLK]
SUPER WHITE
[SW]
Icom, Icom Inc. and logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United
Kingdom, Germany, France, Spain, Russia and/or other countries.
Summary of Contents for IC-M422
Page 1: ...3 26 5 6 2 42 3 6 2 iC m422 ...
Page 6: ...2 1 SECTION 2 INSIDE VIEWS FRONT UNIT MAIN UNIT ...
Page 23: ...7 2 IC M422 sm indd 9 10 4 21 2005 1 01 32 PM ...
Page 24: ...8 1 SECTION 8 SEMICONDUCTOR INFORMATION TRANSISTOR AND FET S DIODES ...
Page 29: ...10 1 SECTION 10 BLOCK DIAGRAM IC M422 sm indd 21 22 4 21 2005 1 01 39 PM ...
Page 32: ...11 3 11 2 LOGIC BOARD IC M422 sm indd 27 28 4 21 2005 1 01 44 PM ...
Page 35: ...S 14131MZ C1 2005 Icom Inc ...